fix(maestro): suffix branch name on new-branch worktree collision

git worktree add -b fails outright when the branch already exists, even
if the target directory is free. A random fast-forward handle commonly
collides with a branch an earlier, already-removed worktree left behind.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Cargo.toml

@@ -10,7 +10,6 @@ repository = "https://git.naps.pt/naps62/maestro"
 publish = false
 
 [workspace.dependencies]
-agent-client-protocol = "2.1"
 axum = { version = "0.7", features = ["ws"] }
 chrono = { version = "0.4", default-features = false, features = ["clock", "serde"] }
 clap = { version = "4.5", features = ["derive", "env"] }
@@ -18,7 +17,6 @@ crossterm = { version = "0.28", features = ["event-stream"] }
 dirs = "5"
 futures-util = { version = "0.3", default-features = false, features = ["sink", "std"] }
 libc = "0.2"
-maestro-acp = { path = "crates/maestro-acp" }
 maestro-config = { path = "crates/maestro-config" }
 # `default-features = false` so each consumer opts into `haiku-autoname`
 # through its own feature of the same name (#131); a workspace entry that
@@ -40,7 +38,6 @@ tempfile = "3"
 thiserror = "1"
 tokio = { version = "1", features = ["macros", "rt-multi-thread", "sync", "time", "net", "io-util", "fs", "signal", "process"] }
 tokio-tungstenite = "0.21"
-tokio-util = { version = "0.7", features = ["compat"] }
 toml = "0.8"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }

crates/maestro-acp/Cargo.toml

@@ -1,20 +0,0 @@
-[package]
-name = "maestro-acp"
-version.workspace = true
-edition.workspace = true
-license.workspace = true
-repository.workspace = true
-publish.workspace = true
-description = "ACP client role: one claude-code-acp child per structured session"
-
-[dependencies]
-agent-client-protocol.workspace = true
-libc.workspace = true
-serde_json.workspace = true
-thiserror.workspace = true
-tokio.workspace = true
-tokio-util.workspace = true
-tracing.workspace = true
-
-[dev-dependencies]
-tempfile.workspace = true

crates/maestro-acp/src/lib.rs

@@ -1,468 +0,0 @@
-//! ACP client role for the daemon (#134): one `claude-code-acp` child per
-//! structured session.
-//!
-//! The daemon is the client; the adapter is the agent. [`spawn`] starts the
-//! adapter as a child process with stdio pipes, in the session's `cwd` with
-//! the session's env, runs the `initialize` + `session/new` handshake, and
-//! hands back an [`AcpSession`] that owns the connection for the life of the
-//! session.
-//!
-//! **The handshake declares almost nothing.** `initialize` reports
-//! `fs.readTextFile`, `fs.writeTextFile` and `terminal` as `false`, so the
-//! adapter uses Claude Code's own Read / Write / Bash instead of asking the
-//! daemon to act on its behalf — exactly what already happens in the
-//! terminal view. `session/request_permission` is the one client method that
-//! gets a real implementation, in #139; here it is a stub that declines.
-//!
-//! Every `session/update` notification the adapter sends lands on an
-//! unbounded channel the session owns ([`AcpSession::take_updates`]). Nothing
-//! is dropped while nobody reads: #135 takes the receiver and persists each
-//! notification to the per-session event log before broadcasting it.
-//!
-//! The child is a child of the daemon, full stop. It shares the daemon's
-//! process group, is marked to receive `SIGTERM` when the daemon dies
-//! (`PR_SET_PDEATHSIG` on Linux), and [`AcpSession::terminate`] is what both
-//! `DELETE /api/sessions/:id` and daemon shutdown call: `session/cancel`, a
-//! short wait, then `SIGTERM`, then `SIGKILL` as the last resort.
-
-#![deny(missing_debug_implementations)]
-
-use std::collections::{HashMap, VecDeque};
-use std::ffi::OsString;
-use std::path::{Path, PathBuf};
-use std::process::{ExitStatus, Stdio};
-use std::sync::{Arc, Mutex};
-use std::time::Duration;
-
-use agent_client_protocol::schema::v1::{
-    CancelNotification, ClientCapabilities, FileSystemCapabilities, Implementation,
-    InitializeRequest, NewSessionRequest, RequestPermissionOutcome, RequestPermissionRequest,
-    RequestPermissionResponse, SessionId, SessionNotification,
-};
-use agent_client_protocol::schema::ProtocolVersion;
-use agent_client_protocol::{ByteStreams, Client};
-use tokio::io::AsyncBufReadExt;
-use tokio::sync::{mpsc, oneshot, watch};
-use tokio_util::compat::{TokioAsyncReadCompatExt, TokioAsyncWriteCompatExt};
-
-pub use agent_client_protocol::schema::v1 as schema;
-
-/// The adapter binary, resolved on `PATH`.
-pub const ADAPTER_BIN: &str = "claude-code-acp";
-
-/// How to install the adapter when it is missing. Named in the error so an
-/// operator staring at a failed session knows what to run.
-pub const INSTALL_COMMAND: &str =
-    "npm install -g --prefix ~/.local @zed-industries/claude-code-acp";
-
-/// How long `initialize` + `session/new` may take before the spawn is
-/// declared failed. The real adapter boots a node process and the Claude
-/// Code SDK behind it; a slow machine takes seconds, never a minute.
-pub const HANDSHAKE_TIMEOUT: Duration = Duration::from_secs(60);
-
-/// How long [`AcpSession::terminate`] waits after `session/cancel` before
-/// sending `SIGTERM`. Cancel is a courtesy that lets the adapter finish the
-/// turn it is on; the signal is what actually ends it.
-pub const CANCEL_GRACE: Duration = Duration::from_millis(500);
-
-/// How long [`AcpSession::terminate`] waits after `SIGTERM` before `SIGKILL`.
-pub const TERM_GRACE: Duration = Duration::from_secs(2);
-
-/// Bytes of the child's stderr kept for the failure message.
-const STDERR_TAIL_BYTES: usize = 4096;
-
-/// What [`spawn`] needs to start one adapter.
-#[derive(Debug, Clone)]
-pub struct SpawnConfig {
-    /// Working directory of the child and `cwd` of `session/new`.
-    pub cwd: PathBuf,
-    /// Environment laid over the daemon's own for the child. A `PATH` in
-    /// here is also what the adapter is resolved against, since that is the
-    /// `PATH` the child would see.
-    pub env: HashMap<String, String>,
-    /// Upper bound on the handshake; [`HANDSHAKE_TIMEOUT`] by default.
-    pub handshake_timeout: Duration,
-}
-
-impl SpawnConfig {
-    pub fn new(cwd: impl Into<PathBuf>, env: HashMap<String, String>) -> Self {
-        Self {
-            cwd: cwd.into(),
-            env,
-            handshake_timeout: HANDSHAKE_TIMEOUT,
-        }
-    }
-}
-
-#[derive(Debug, thiserror::Error)]
-pub enum AcpError {
-    /// The adapter is not on `PATH`. The message names the install command
-    /// so the failed session is actionable rather than silently dead.
-    #[error("{ADAPTER_BIN} not found on PATH; install it with: {INSTALL_COMMAND}")]
-    AdapterMissing,
-    #[error("failed to start {ADAPTER_BIN}: {0}")]
-    Spawn(#[source] std::io::Error),
-    /// The adapter answered the handshake with an error.
-    #[error("ACP handshake failed: {0}")]
-    Handshake(String),
-    /// The adapter went away before the handshake finished. Carries the
-    /// tail of its stderr, which is where a missing Claude login shows up.
-    #[error("{ADAPTER_BIN} exited during the ACP handshake ({status}){stderr}")]
-    ExitedEarly { status: String, stderr: String },
-    #[error("ACP handshake timed out after {0:?}")]
-    HandshakeTimeout(Duration),
-}
-
-/// Resolve [`ADAPTER_BIN`] against the `PATH` the child would run with: the
-/// session env's `PATH` when it sets one, the daemon's own otherwise.
-pub fn resolve_adapter(env: &HashMap<String, String>) -> Option<PathBuf> {
-    let path: OsString = match env.get("PATH") {
-        Some(p) => OsString::from(p),
-        None => std::env::var_os("PATH")?,
-    };
-    std::env::split_paths(&path)
-        .filter(|dir| !dir.as_os_str().is_empty())
-        .map(|dir| dir.join(ADAPTER_BIN))
-        .find(|candidate| is_executable(candidate))
-}
-
-fn is_executable(path: &Path) -> bool {
-    use std::os::unix::fs::PermissionsExt;
-    std::fs::metadata(path)
-        .map(|m| m.is_file() && m.permissions().mode() & 0o111 != 0)
-        .unwrap_or(false)
-}
-
-enum Command {
-    Cancel,
-    Close,
-}
-
-/// Why the handshake did not produce a session id.
-enum ReadyError {
-    /// The adapter answered with an error.
-    Handshake(String),
-    /// The transport closed under the request: the child is gone.
-    Closed,
-}
-
-fn ready_error(e: agent_client_protocol::Error) -> ReadyError {
-    if agent_client_protocol::is_incoming_transport_closed(&e) {
-        ReadyError::Closed
-    } else {
-        ReadyError::Handshake(e.to_string())
-    }
-}
-
-/// A live ACP connection to one adapter child. Dropping it sends `SIGTERM`
-/// if the child is still running; [`AcpSession::terminate`] is the polite
-/// version.
-#[derive(Debug)]
-pub struct AcpSession {
-    session_id: String,
-    pid: u32,
-    commands: mpsc::UnboundedSender<Command>,
-    updates: Mutex<Option<mpsc::UnboundedReceiver<SessionNotification>>>,
-    exit: watch::Receiver<Option<ExitStatus>>,
-}
-
-impl AcpSession {
-    /// The id `session/new` returned. What a respawn passes to
-    /// `session/load` (#135).
-    pub fn session_id(&self) -> &str {
-        &self.session_id
-    }
-
-    /// The adapter's pid.
-    pub fn pid(&self) -> u32 {
-        self.pid
-    }
-
-    /// Whether the child has been reaped.
-    pub fn has_exited(&self) -> bool {
-        self.exit.borrow().is_some()
-    }
-
-    /// Wait for the child to exit.
-    pub async fn wait(&self) -> Option<ExitStatus> {
-        wait_exit(&self.exit).await
-    }
-
-    /// The stream of raw `session/update` notifications, handed out once.
-    /// Notifications that arrived before the take are still queued on it.
-    pub fn take_updates(&self) -> Option<mpsc::UnboundedReceiver<SessionNotification>> {
-        self.updates.lock().expect("updates mutex").take()
-    }
-
-    /// Send `session/cancel`. Fire-and-forget: a closed connection means the
-    /// child is already gone, which is the outcome cancel was after.
-    pub fn cancel(&self) {
-        let _ = self.commands.send(Command::Cancel);
-    }
-
-    /// End the child: `session/cancel`, wait `cancel_grace`, `SIGTERM`, wait
-    /// `term_grace`, `SIGKILL`. Returns once the child has been reaped.
-    pub async fn terminate(&self, cancel_grace: Duration, term_grace: Duration) {
-        if self.has_exited() {
-            return;
-        }
-        self.cancel();
-        if tokio::time::timeout(cancel_grace, self.wait())
-            .await
-            .is_ok()
-        {
-            return;
-        }
-        self.signal(libc::SIGTERM);
-        if tokio::time::timeout(term_grace, self.wait()).await.is_ok() {
-            return;
-        }
-        tracing::warn!(
-            pid = self.pid,
-            "{ADAPTER_BIN} ignored SIGTERM; sending SIGKILL"
-        );
-        self.signal(libc::SIGKILL);
-        let _ = self.commands.send(Command::Close);
-        self.wait().await;
-    }
-
-    fn signal(&self, sig: libc::c_int) {
-        signal_pid(self.pid, sig);
-    }
-}
-
-impl Drop for AcpSession {
-    fn drop(&mut self) {
-        let _ = self.commands.send(Command::Close);
-        if !self.has_exited() {
-            self.signal(libc::SIGTERM);
-        }
-    }
-}
-
-/// Start the adapter for one session and run the handshake.
-///
-/// Fails without a running child: on any error the process is already
-/// signalled, so a failed session never leaves a stray adapter behind.
-pub async fn spawn(config: SpawnConfig) -> Result<AcpSession, AcpError> {
-    let adapter = resolve_adapter(&config.env).ok_or(AcpError::AdapterMissing)?;
-
-    let mut cmd = tokio::process::Command::new(&adapter);
-    cmd.current_dir(&config.cwd)
-        .envs(&config.env)
-        // Claude Code refuses to start when it thinks it is nested inside
-        // another Claude Code session; a daemon launched from one would
-        // otherwise never get a structured session up.
-        .env_remove("CLAUDECODE")
-        .stdin(Stdio::piped())
-        .stdout(Stdio::piped())
-        .stderr(Stdio::piped())
-        // If the daemon is dropped without a graceful shutdown the runtime
-        // still tears the task holding this `Child` down, and that kills it.
-        .kill_on_drop(true);
-    #[cfg(target_os = "linux")]
-    {
-        // Same process group as the daemon (no setpgid), and SIGTERM when the
-        // daemon dies however it dies: an agent that outlives its daemon is
-        // exactly the orphan #134 rules out.
-        // SAFETY: prctl is async-signal-safe and touches no shared state.
-        unsafe {
-            cmd.pre_exec(|| {
-                libc::prctl(libc::PR_SET_PDEATHSIG, libc::SIGTERM);
-                Ok(())
-            });
-        }
-    }
-    let mut child = cmd.spawn().map_err(AcpError::Spawn)?;
-    let pid = child.id().expect("child pid is known before wait");
-    let stdin = child.stdin.take().expect("piped stdin");
-    let stdout = child.stdout.take().expect("piped stdout");
-    let stderr = child.stderr.take().expect("piped stderr");
-
-    let stderr_tail = Arc::new(Mutex::new(VecDeque::<u8>::new()));
-    tokio::spawn(drain_stderr(stderr, pid, stderr_tail.clone()));
-
-    let (exit_tx, exit_rx) = watch::channel(None);
-    tokio::spawn(async move {
-        let status = child.wait().await.ok();
-        tracing::debug!(pid, ?status, "{ADAPTER_BIN} exited");
-        let _ = exit_tx.send(status);
-    });
-
-    let (updates_tx, updates_rx) = mpsc::unbounded_channel();
-    let (commands_tx, commands_rx) = mpsc::unbounded_channel();
-    let (ready_tx, ready_rx) = oneshot::channel();
-    let transport = ByteStreams::new(stdin.compat_write(), stdout.compat());
-    tokio::spawn(run_connection(
-        transport,
-        config.cwd.clone(),
-        updates_tx,
-        commands_rx,
-        ready_tx,
-    ));
-
-    let outcome = tokio::time::timeout(config.handshake_timeout, ready_rx).await;
-    let failure = match outcome {
-        Ok(Ok(Ok(session_id))) => {
-            return Ok(AcpSession {
-                session_id,
-                pid,
-                commands: commands_tx,
-                updates: Mutex::new(Some(updates_rx)),
-                exit: exit_rx,
-            });
-        }
-        Ok(Ok(Err(ReadyError::Handshake(message)))) => AcpError::Handshake(message),
-        Ok(Ok(Err(ReadyError::Closed))) | Ok(Err(_)) => {
-            // The connection ended before the handshake did: the child went
-            // away. Reap it so the status is real, then report.
-            let status = wait_exit(&exit_rx).await;
-            let stderr = {
-                let mut tail = stderr_tail.lock().expect("stderr tail");
-                tail.make_contiguous();
-                String::from_utf8_lossy(tail.as_slices().0)
-                    .trim()
-                    .to_string()
-            };
-            AcpError::ExitedEarly {
-                status: status.map_or_else(|| "unknown status".into(), |s| s.to_string()),
-                stderr: if stderr.is_empty() {
-                    String::new()
-                } else {
-                    format!(": {stderr}")
-                },
-            }
-        }
-        Err(_) => AcpError::HandshakeTimeout(config.handshake_timeout),
-    };
-    // No half-started adapter survives a failed spawn.
-    let _ = commands_tx.send(Command::Close);
-    signal_pid(pid, libc::SIGTERM);
-    if tokio::time::timeout(TERM_GRACE, wait_exit(&exit_rx))
-        .await
-        .is_err()
-    {
-        signal_pid(pid, libc::SIGKILL);
-        wait_exit(&exit_rx).await;
-    }
-    Err(failure)
-}
-
-async fn wait_exit(exit: &watch::Receiver<Option<ExitStatus>>) -> Option<ExitStatus> {
-    let mut exit = exit.clone();
-    let status = exit.wait_for(|s| s.is_some()).await.ok()?;
-    *status
-}
-
-fn signal_pid(pid: u32, sig: libc::c_int) {
-    // ESRCH just means the child is already gone.
-    // SAFETY: plain syscall on a pid we spawned and have not reaped.
-    unsafe {
-        libc::kill(pid as libc::pid_t, sig);
-    }
-}
-
-/// The capabilities the daemon declares: none of the filesystem or terminal
-/// surface, so the adapter falls back to Claude Code's own tools.
-fn client_capabilities() -> ClientCapabilities {
-    ClientCapabilities::new()
-        .fs(FileSystemCapabilities::new()
-            .read_text_file(false)
-            .write_text_file(false))
-        .terminal(false)
-}
-
-async fn run_connection<T>(
-    transport: T,
-    cwd: PathBuf,
-    updates_tx: mpsc::UnboundedSender<SessionNotification>,
-    mut commands_rx: mpsc::UnboundedReceiver<Command>,
-    ready_tx: oneshot::Sender<Result<String, ReadyError>>,
-) where
-    T: agent_client_protocol::ConnectTo<Client> + 'static,
-{
-    let result = Client
-        .builder()
-        .name("maestro")
-        .on_receive_notification(
-            async move |notification: SessionNotification, _cx| {
-                // A dropped receiver only means nobody wants updates any more.
-                let _ = updates_tx.send(notification);
-                Ok(())
-            },
-            agent_client_protocol::on_receive_notification!(),
-        )
-        .on_receive_request(
-            async move |request: RequestPermissionRequest, responder, _cx| {
-                // Stub until #139: decline rather than grant something the
-                // operator never saw.
-                tracing::warn!(
-                    session = %request.session_id,
-                    "session/request_permission declined: not implemented yet (#139)"
-                );
-                responder.respond(RequestPermissionResponse::new(
-                    RequestPermissionOutcome::Cancelled,
-                ))
-            },
-            agent_client_protocol::on_receive_request!(),
-        )
-        .connect_with(transport, async move |cx| {
-            let init = InitializeRequest::new(ProtocolVersion::V1)
-                .client_capabilities(client_capabilities())
-                .client_info(Implementation::new("maestro", env!("CARGO_PKG_VERSION")));
-            if let Err(e) = cx.send_request(init).block_task().await {
-                let _ = ready_tx.send(Err(ready_error(e)));
-                return Ok(());
-            }
-            let created = match cx
-                .send_request(NewSessionRequest::new(cwd))
-                .block_task()
-                .await
-            {
-                Ok(r) => r,
-                Err(e) => {
-                    let _ = ready_tx.send(Err(ready_error(e)));
-                    return Ok(());
-                }
-            };
-            let session_id = created.session_id.0.to_string();
-            let _ = ready_tx.send(Ok(session_id.clone()));
-
-            loop {
-                tokio::select! {
-                    cmd = commands_rx.recv() => match cmd {
-                        Some(Command::Cancel) => {
-                            let _ = cx.send_notification(CancelNotification::new(
-                                SessionId::new(session_id.as_str()),
-                            ));
-                        }
-                        Some(Command::Close) | None => break,
-                    },
-                    _ = cx.incoming_closed() => break,
-                }
-            }
-            Ok(())
-        })
-        .await;
-    if let Err(e) = result {
-        tracing::debug!(error = %e, "ACP connection ended with an error");
-    }
-}
-
-async fn drain_stderr(
-    stderr: tokio::process::ChildStderr,
-    pid: u32,
-    tail: Arc<Mutex<VecDeque<u8>>>,
-) {
-    let mut lines = tokio::io::BufReader::new(stderr).lines();
-    while let Ok(Some(line)) = lines.next_line().await {
-        tracing::debug!(pid, "{ADAPTER_BIN}: {line}");
-        let mut tail = tail.lock().expect("stderr tail");
-        tail.extend(line.as_bytes());
-        tail.push_back(b'\n');
-        while tail.len() > STDERR_TAIL_BYTES {
-            tail.pop_front();
-        }
-        tail.make_contiguous();
-    }
-}

crates/maestro-acp/tests/fake_acp_agent.py

@@ -1,98 +0,0 @@
-#!/usr/bin/env python3
-"""A deterministic stand-in for `claude-code-acp` (#134).
-
-Speaks just enough JSON-RPC over stdio for the daemon's handshake:
-answers `initialize` and `session/new`, logs every method it receives, and
-exits on SIGTERM. Tests point `PATH` at a directory holding this file under
-the adapter's name, so the real adapter (which needs Claude auth and is
-slow) never runs in the deterministic suite.
-
-Environment knobs, all optional:
-
-  FAKE_ACP_LOG            append one line per event to this file:
-                            start pid=<pid> cwd=<cwd>
-                            env <NAME>=<value>       (for FAKE_ACP_ECHO_ENV)
-                            caps <json of clientCapabilities>
-                            recv <method>
-                            signal SIGTERM
-  FAKE_ACP_ECHO_ENV       name of one env var to log at start
-  FAKE_ACP_INIT_FAIL=1    answer `initialize` with a JSON-RPC error
-  FAKE_ACP_EXIT_AFTER_NEW=1  exit 0 right after answering `session/new`
-  FAKE_ACP_EXIT_ON_CANCEL=1  exit 0 on `session/cancel` (default: keep running
-                             so the SIGTERM path is exercised)
-"""
-import json
-import os
-import signal
-import sys
-
-LOG = os.environ.get("FAKE_ACP_LOG")
-
-
-def log(line):
-    if not LOG:
-        return
-    with open(LOG, "a") as f:
-        f.write(line + "\n")
-        f.flush()
-
-
-def send(obj):
-    sys.stdout.write(json.dumps(obj) + "\n")
-    sys.stdout.flush()
-
-
-def on_sigterm(_signum, _frame):
-    log("signal SIGTERM")
-    sys.exit(0)
-
-
-signal.signal(signal.SIGTERM, on_sigterm)
-
-log(f"start pid={os.getpid()} cwd={os.getcwd()}")
-echo = os.environ.get("FAKE_ACP_ECHO_ENV")
-if echo:
-    log(f"env {echo}={os.environ.get(echo, '')}")
-
-session_id = f"fake-{os.getpid()}"
-
-for raw in sys.stdin:
-    raw = raw.strip()
-    if not raw:
-        continue
-    msg = json.loads(raw)
-    method = msg.get("method")
-    if method is None:
-        # A response to something we sent; nothing to do.
-        continue
-    log(f"recv {method}")
-    rid = msg.get("id")
-    params = msg.get("params") or {}
-
-    if method == "initialize":
-        log("caps " + json.dumps(params.get("clientCapabilities", {}), sort_keys=True))
-        if os.environ.get("FAKE_ACP_INIT_FAIL") == "1":
-            send({"jsonrpc": "2.0", "id": rid,
-                  "error": {"code": -32000, "message": "fake init failure"}})
-            continue
-        send({"jsonrpc": "2.0", "id": rid, "result": {
-            "protocolVersion": params.get("protocolVersion", 1),
-            "agentCapabilities": {"loadSession": True},
-            "agentInfo": {"name": "fake-acp-agent", "version": "0.0.0"},
-            "authMethods": [],
-        }})
-    elif method == "session/new":
-        send({"jsonrpc": "2.0", "id": rid, "result": {"sessionId": session_id}})
-        send({"jsonrpc": "2.0", "method": "session/update", "params": {
-            "sessionId": session_id,
-            "update": {"sessionUpdate": "agent_message_chunk",
-                       "content": {"type": "text", "text": "hello from fake"}},
-        }})
-        if os.environ.get("FAKE_ACP_EXIT_AFTER_NEW") == "1":
-            sys.exit(0)
-    elif method == "session/cancel":
-        if os.environ.get("FAKE_ACP_EXIT_ON_CANCEL") == "1":
-            sys.exit(0)
-    elif rid is not None:
-        send({"jsonrpc": "2.0", "id": rid,
-              "error": {"code": -32601, "message": f"method not found: {method}"}})

crates/maestro-acp/tests/spawn.rs

@@ -1,292 +0,0 @@
-//! `maestro-acp` against the fake adapter in `tests/fake_acp_agent.py`, plus
-//! one ignored test against the real `claude-code-acp`.
-
-use std::collections::HashMap;
-use std::path::{Path, PathBuf};
-use std::time::{Duration, Instant};
-
-use maestro_acp::schema::{ContentBlock, SessionUpdate};
-use maestro_acp::{AcpError, SpawnConfig, ADAPTER_BIN, INSTALL_COMMAND};
-use tempfile::TempDir;
-
-fn fake_agent() -> PathBuf {
-    Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/fake_acp_agent.py")
-}
-
-/// A temp `bin/` holding the fake agent under the adapter's name, plus a
-/// log file the agent appends to. `PATH` for the spawn is just that dir.
-struct Fake {
-    dir: TempDir,
-}
-
-impl Fake {
-    fn new() -> Self {
-        let dir = TempDir::new().unwrap();
-        let bin = dir.path().join("bin");
-        std::fs::create_dir_all(&bin).unwrap();
-        std::fs::copy(fake_agent(), bin.join(ADAPTER_BIN)).unwrap();
-        Self { dir }
-    }
-
-    fn log_path(&self) -> PathBuf {
-        self.dir.path().join("agent.log")
-    }
-
-    fn log(&self) -> String {
-        std::fs::read_to_string(self.log_path()).unwrap_or_default()
-    }
-
-    /// The fake's `bin/` first, so it shadows any real adapter, then the
-    /// process `PATH` so the script's `python3` still resolves.
-    fn env(&self) -> HashMap<String, String> {
-        let path = format!(
-            "{}:{}",
-            self.dir.path().join("bin").display(),
-            std::env::var("PATH").unwrap_or_default()
-        );
-        HashMap::from([
-            ("PATH".to_string(), path),
-            (
-                "FAKE_ACP_LOG".to_string(),
-                self.log_path().to_string_lossy().into_owned(),
-            ),
-        ])
-    }
-
-    fn config(&self, cwd: &Path) -> SpawnConfig {
-        let mut config = SpawnConfig::new(cwd, self.env());
-        config.handshake_timeout = Duration::from_secs(10);
-        config
-    }
-
-    async fn wait_for_log(&self, needle: &str) {
-        let deadline = Instant::now() + Duration::from_secs(5);
-        while Instant::now() < deadline {
-            if self.log().contains(needle) {
-                return;
-            }
-            tokio::time::sleep(Duration::from_millis(20)).await;
-        }
-        panic!("log never contained {needle:?}:\n{}", self.log());
-    }
-}
-
-fn pid_alive(pid: u32) -> bool {
-    Path::new(&format!("/proc/{pid}")).exists()
-        && std::fs::read_to_string(format!("/proc/{pid}/stat"))
-            .map(|s| !s.contains(") Z "))
-            .unwrap_or(false)
-}
-
-#[tokio::test]
-async fn spawn_runs_adapter_in_cwd_with_env_and_restrictive_caps() {
-    let fake = Fake::new();
-    let cwd = TempDir::new().unwrap();
-    let mut config = fake.config(cwd.path());
-    config
-        .env
-        .insert("FAKE_ACP_ECHO_ENV".into(), "MAESTRO_SESSION_ID".into());
-    config
-        .env
-        .insert("MAESTRO_SESSION_ID".into(), "sess-123".into());
-
-    let session = maestro_acp::spawn(config).await.expect("spawn");
-    assert!(session.session_id().starts_with("fake-"));
-    assert!(pid_alive(session.pid()));
-
-    let log = fake.log();
-    let cwd_canon = cwd.path().canonicalize().unwrap();
-    assert!(
-        log.contains(&format!("cwd={}", cwd_canon.display())),
-        "child cwd missing from log:\n{log}"
-    );
-    assert!(log.contains("env MAESTRO_SESSION_ID=sess-123"), "{log}");
-    assert!(log.contains("recv initialize"), "{log}");
-    assert!(log.contains("recv session/new"), "{log}");
-    let caps = log
-        .lines()
-        .find_map(|l| l.strip_prefix("caps "))
-        .expect("caps line");
-    let caps: serde_json::Value = serde_json::from_str(caps).unwrap();
-    assert_eq!(caps["fs"]["readTextFile"], false);
-    assert_eq!(caps["fs"]["writeTextFile"], false);
-    assert_eq!(caps["terminal"], false);
-
-    session
-        .terminate(Duration::from_millis(100), Duration::from_secs(2))
-        .await;
-}
-
-#[tokio::test]
-async fn missing_adapter_names_the_install_command() {
-    let empty = TempDir::new().unwrap();
-    let cwd = TempDir::new().unwrap();
-    let env = HashMap::from([(
-        "PATH".to_string(),
-        empty.path().to_string_lossy().into_owned(),
-    )]);
-    let err = maestro_acp::spawn(SpawnConfig::new(cwd.path(), env))
-        .await
-        .expect_err("no adapter on PATH");
-    assert!(matches!(err, AcpError::AdapterMissing));
-    let msg = err.to_string();
-    assert!(msg.contains(ADAPTER_BIN), "{msg}");
-    assert!(msg.contains(INSTALL_COMMAND), "{msg}");
-}
-
-#[tokio::test]
-async fn session_updates_reach_the_taken_receiver() {
-    let fake = Fake::new();
-    let cwd = TempDir::new().unwrap();
-    let session = maestro_acp::spawn(fake.config(cwd.path()))
-        .await
-        .expect("spawn");
-
-    let mut updates = session.take_updates().expect("first take");
-    assert!(session.take_updates().is_none(), "handed out once");
-    let first = tokio::time::timeout(Duration::from_secs(5), updates.recv())
-        .await
-        .expect("update within 5s")
-        .expect("channel open");
-    assert_eq!(first.session_id.0.as_ref(), session.session_id());
-    match first.update {
-        SessionUpdate::AgentMessageChunk(chunk) => match chunk.content {
-            ContentBlock::Text(t) => assert_eq!(t.text, "hello from fake"),
-            other => panic!("unexpected content {other:?}"),
-        },
-        other => panic!("unexpected update {other:?}"),
-    }
-
-    session
-        .terminate(Duration::from_millis(100), Duration::from_secs(2))
-        .await;
-}
-
-#[tokio::test]
-async fn terminate_sends_cancel_then_sigterm() {
-    let fake = Fake::new();
-    let cwd = TempDir::new().unwrap();
-    let session = maestro_acp::spawn(fake.config(cwd.path()))
-        .await
-        .expect("spawn");
-    let pid = session.pid();
-
-    session
-        .terminate(Duration::from_millis(200), Duration::from_secs(2))
-        .await;
-    assert!(session.has_exited());
-    fake.wait_for_log("signal SIGTERM").await;
-
-    let log = fake.log();
-    let cancel = log.find("recv session/cancel").expect("cancel logged");
-    let term = log.find("signal SIGTERM").expect("SIGTERM logged");
-    assert!(cancel < term, "cancel must precede SIGTERM:\n{log}");
-    assert!(!pid_alive(pid), "child {pid} still alive");
-}
-
-#[tokio::test]
-async fn terminate_is_satisfied_by_an_exit_on_cancel() {
-    let fake = Fake::new();
-    let cwd = TempDir::new().unwrap();
-    let mut config = fake.config(cwd.path());
-    config
-        .env
-        .insert("FAKE_ACP_EXIT_ON_CANCEL".into(), "1".into());
-    let session = maestro_acp::spawn(config).await.expect("spawn");
-
-    session
-        .terminate(Duration::from_secs(2), Duration::from_secs(2))
-        .await;
-    assert!(session.has_exited());
-    let log = fake.log();
-    assert!(log.contains("recv session/cancel"), "{log}");
-    assert!(!log.contains("signal SIGTERM"), "cancel was enough:\n{log}");
-}
-
-#[tokio::test]
-async fn handshake_error_fails_the_spawn_and_reaps_the_child() {
-    let fake = Fake::new();
-    let cwd = TempDir::new().unwrap();
-    let mut config = fake.config(cwd.path());
-    config.env.insert("FAKE_ACP_INIT_FAIL".into(), "1".into());
-
-    let err = maestro_acp::spawn(config).await.expect_err("init fails");
-    assert!(matches!(err, AcpError::Handshake(_)), "{err}");
-    assert!(err.to_string().contains("fake init failure"), "{err}");
-    // Closing the connection gives the fake EOF on stdin; the SIGTERM that
-    // follows may find it already gone. Either way it must not survive.
-    let pid: u32 = fake
-        .log()
-        .lines()
-        .find_map(|l| l.strip_prefix("start pid="))
-        .and_then(|rest| rest.split(' ').next())
-        .and_then(|p| p.parse().ok())
-        .expect("pid in log");
-    let deadline = Instant::now() + Duration::from_secs(5);
-    while pid_alive(pid) && Instant::now() < deadline {
-        tokio::time::sleep(Duration::from_millis(20)).await;
-    }
-    assert!(!pid_alive(pid), "child {pid} outlived the failed spawn");
-}
-
-#[tokio::test]
-async fn early_exit_is_observed_after_a_successful_handshake() {
-    let fake = Fake::new();
-    let cwd = TempDir::new().unwrap();
-    let mut config = fake.config(cwd.path());
-    config
-        .env
-        .insert("FAKE_ACP_EXIT_AFTER_NEW".into(), "1".into());
-    let session = maestro_acp::spawn(config).await.expect("spawn");
-
-    let status = tokio::time::timeout(Duration::from_secs(5), session.wait())
-        .await
-        .expect("exit within 5s")
-        .expect("status");
-    assert!(status.success(), "{status}");
-    assert!(session.has_exited());
-}
-
-#[tokio::test]
-async fn child_exit_before_handshake_reports_exited_early() {
-    // A "adapter" that dies before answering anything.
-    let dir = TempDir::new().unwrap();
-    let bin = dir.path().join("bin");
-    std::fs::create_dir_all(&bin).unwrap();
-    let script = bin.join(ADAPTER_BIN);
-    std::fs::write(&script, "#!/bin/sh\necho 'not logged in' >&2\nexit 3\n").unwrap();
-    {
-        use std::os::unix::fs::PermissionsExt;
-        std::fs::set_permissions(&script, std::fs::Permissions::from_mode(0o755)).unwrap();
-    }
-    let cwd = TempDir::new().unwrap();
-    let env = HashMap::from([("PATH".to_string(), bin.to_string_lossy().into_owned())]);
-    let mut config = SpawnConfig::new(cwd.path(), env);
-    config.handshake_timeout = Duration::from_secs(10);
-
-    let err = maestro_acp::spawn(config).await.expect_err("child died");
-    match &err {
-        AcpError::ExitedEarly { status, stderr } => {
-            assert!(status.contains('3'), "{status}");
-            assert!(stderr.contains("not logged in"), "{stderr}");
-        }
-        other => panic!("unexpected {other:?}"),
-    }
-}
-
-/// End to end against the installed `claude-code-acp`. Needs Claude auth,
-/// takes seconds, so it is opt-in: `cargo test -p maestro-acp -- --ignored`.
-#[tokio::test]
-#[ignore]
-async fn real_adapter_handshake() {
-    let cwd = TempDir::new().unwrap();
-    let session = maestro_acp::spawn(SpawnConfig::new(cwd.path(), HashMap::new()))
-        .await
-        .expect("real claude-code-acp handshake");
-    assert!(!session.session_id().is_empty());
-    assert!(pid_alive(session.pid()));
-    session
-        .terminate(maestro_acp::CANCEL_GRACE, maestro_acp::TERM_GRACE)
-        .await;
-    assert!(session.has_exited());
-}

crates/maestro-cli/src/sessions.rs

@@ -51,7 +51,6 @@ pub async fn run_spawn(client: &DaemonClient, args: SpawnArgs) -> Result<Session
     };
 
     let body = CreateSessionRequest {
-        view: Default::default(),
         cwd: args.cwd.clone(),
         command: args.command.clone(),
         env,
@@ -237,7 +236,6 @@ mod tests {
 
     fn session(cwd: &str, command: &str, id: u128) -> Session {
         Session {
-            view: Default::default(),
             id: Uuid::from_u128(id),
             cwd: PathBuf::from(cwd),
             command: command.into(),
@@ -254,7 +252,6 @@ mod tests {
             current_cwd: None,
             blocked_work: None,
             last_focused_at: None,
-            acp_session_id: None,
         }
     }
 

crates/maestro-cli/tests/against_mock_daemon.rs

@@ -91,7 +91,6 @@ async fn spawn_round_trips_through_the_daemon() {
     let created = mock
         .client()
         .create_session(&maestro_protocol::CreateSessionRequest {
-            view: Default::default(),
             cwd: "/home/mock".into(),
             command: "bash".into(),
             env: Default::default(),

crates/maestro-daemon/Cargo.toml

@@ -28,7 +28,6 @@ dirs.workspace = true
 futures-util.workspace = true
 include_dir = { workspace = true, optional = true }
 libc.workspace = true
-maestro-acp.workspace = true
 mime_guess = { workspace = true, optional = true }
 maestro-config.workspace = true
 maestro-hooks = { workspace = true, default-features = false }
@@ -43,7 +42,6 @@ tracing-subscriber.workspace = true
 uuid.workspace = true
 
 [dev-dependencies]
-libc.workspace = true
 reqwest.workspace = true
 tokio-tungstenite.workspace = true
 urlencoding = "2"

crates/maestro-daemon/src/cli.rs

@@ -106,7 +106,7 @@ async fn run(config_override: Option<PathBuf>) -> Result<(), Box<dyn Error>> {
     projects.start_background_refresh();
 
     let router = local_api::router(local_api::state_for(
-        manager.clone(),
+        manager,
         config.hostname.clone(),
         config.home_dir.clone(),
         config.spawn_presets.clone(),
@@ -118,25 +118,14 @@ async fn run(config_override: Option<PathBuf>) -> Result<(), Box<dyn Error>> {
     let bound = listener.local_addr()?;
     tracing::info!(addr = %bound, "API listening");
 
-    // Ctrl-C at a terminal or SIGTERM from systemd: either one is a
-    // shutdown, and both must reach the adapter children below (#134). The
-    // unit's `KillMode=process` signals only the daemon, so nothing else
-    // would end them.
     let shutdown = async {
-        let mut sigterm = tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate())
-            .expect("install SIGTERM handler");
-        tokio::select! {
-            _ = tokio::signal::ctrl_c() => tracing::info!("ctrl-c received — shutting down"),
-            _ = sigterm.recv() => tracing::info!("SIGTERM received — shutting down"),
-        }
+        let _ = tokio::signal::ctrl_c().await;
+        tracing::info!("ctrl-c received — shutting down");
     };
 
     axum::serve(listener, router)
         .tcp_nodelay(true)
         .with_graceful_shutdown(shutdown)
         .await?;
-    // tmux sessions outlive the daemon by design; structured sessions'
-    // adapter children do not (#134).
-    manager.shutdown().await;
     Ok(())
 }

crates/maestro-daemon/src/session.rs

@@ -12,10 +12,9 @@ use std::sync::Arc;
 use std::time::Duration;
 
 use chrono::Utc;
-use maestro_acp::{AcpSession, SpawnConfig};
 use maestro_protocol::{
     ActivityState, CatalogEvent, CreateSessionRequest, ErrorInfo, NameSource, Session,
-    SessionStatus, SessionView, WorktreeSpec, NAME_KEY, NAME_SOURCE_KEY,
+    SessionStatus, WorktreeSpec, NAME_KEY, NAME_SOURCE_KEY,
 };
 use tokio::sync::{broadcast, Mutex};
 use uuid::Uuid;
@@ -88,12 +87,6 @@ pub struct SessionRecord {
     /// glow, this holds through focus loss until the session does new work.
     /// Daemon-local; never rides the wire.
     pub awaiting_suppressed: bool,
-    /// The `claude-code-acp` child behind a [`SessionView::Structured`]
-    /// session (#134): its connection, pid and the raw notification stream.
-    /// `None` for terminal sessions and for a structured session whose
-    /// adapter never came up. Shared so a kill or shutdown can terminate it
-    /// outside the sessions lock. Daemon-local; never rides the wire.
-    pub acp: Option<Arc<AcpSession>>,
 }
 
 #[derive(Debug, thiserror::Error)]
@@ -294,47 +287,6 @@ impl SessionManager {
         sessions.values().map(|r| r.session.clone()).collect()
     }
 
-    /// The raw `session/update` stream of a structured session (#134),
-    /// handed out once; `None` for a terminal session, a session whose
-    /// adapter never came up, or a stream already taken. Notifications that
-    /// arrived before the take are still queued. #135 takes it to feed the
-    /// per-session event log.
-    pub async fn take_acp_updates(
-        &self,
-        id: Uuid,
-    ) -> Option<tokio::sync::mpsc::UnboundedReceiver<maestro_acp::schema::SessionNotification>>
-    {
-        let sessions = self.inner.sessions.lock().await;
-        sessions.get(&id)?.acp.as_ref()?.take_updates()
-    }
-
-    /// End every adapter child before the daemon exits (#134): each gets
-    /// `session/cancel`, then SIGTERM, concurrently. The sessions stay in
-    /// the map, marked Dead and written through to their sidecars, so what
-    /// is on disk after the restart is truthful. tmux sessions are left
-    /// alone — surviving a restart is what they are for.
-    pub async fn shutdown(&self) {
-        let children: Vec<(Uuid, Arc<AcpSession>)> = {
-            let sessions = self.inner.sessions.lock().await;
-            sessions
-                .iter()
-                .filter(|(_, r)| r.session.status == SessionStatus::Running)
-                .filter_map(|(id, r)| r.acp.clone().map(|acp| (*id, acp)))
-                .collect()
-        };
-        if children.is_empty() {
-            return;
-        }
-        tracing::info!(count = children.len(), "shutdown: ending adapter children");
-        let terminations = children
-            .iter()
-            .map(|(_, acp)| acp.terminate(maestro_acp::CANCEL_GRACE, maestro_acp::TERM_GRACE));
-        futures_util::future::join_all(terminations).await;
-        for (id, _) in children {
-            mark_session_dead(&self.inner, id).await;
-        }
-    }
-
     /// Subscribe to a session's PTY broadcast. `None` if the session is
     /// unknown to this daemon.
     pub async fn subscribe_pty(&self, id: Uuid) -> Option<broadcast::Receiver<Vec<u8>>> {
@@ -365,7 +317,7 @@ impl SessionManager {
             // replayed from it renders as garbage until something forces a
             // repaint. A dead session has no pane left to capture, so it
             // keeps the byte tail.
-            let alive = rec.session.status == SessionStatus::Running && rec.acp.is_none();
+            let alive = rec.session.status == SessionStatus::Running;
             // The capture shells out to tmux while the replay lock is held,
             // which parks the reader for the length of one tmux round-trip.
             // That only happens on attach, and the alternative is a seam in
@@ -475,48 +427,20 @@ impl SessionManager {
         {
             session_env.insert("MAESTRO_URL".into(), url);
         }
-        // A structured session (#134) gets no tmux pane: the agent is a
-        // child of the daemon, driven over ACP. An adapter that cannot come
-        // up still yields a session — Dead, with the reason on it — so the
-        // operator sees what to fix instead of a silently missing session.
-        let (acp, acp_failure) = match req.view {
-            SessionView::Structured => {
-                match maestro_acp::spawn(SpawnConfig::new(
-                    &effective_cwd,
-                    session_env
-                        .iter()
-                        .map(|(k, v)| (k.clone(), v.clone()))
-                        .collect(),
-                ))
-                .await
-                {
-                    Ok(acp) => (Some(Arc::new(acp)), None),
-                    Err(e) => {
-                        tracing::warn!(%id, error = %e, "structured session: adapter failed to start");
-                        (None, Some(e.to_string()))
-                    }
-                }
-            }
-            SessionView::Terminal => {
-                let spawned = {
-                    let tmux = self.inner.tmux.clone();
-                    let cwd = effective_cwd.clone();
-                    let command = req.command.clone();
-                    let sink = pipe_pane_command(&fifo_path);
-                    let env = session_env.clone();
-                    tmux_blocking(move || tmux.new_session_piped(id, &cwd, &command, &env, &sink))
-                        .await
-                };
-                if let Err(e) = spawned {
-                    // `bridge` drops at the end of this block, closing the
-                    // FIFO reader.
-                    let _ = std::fs::remove_file(&fifo_path);
-                    self.rollback_worktree(&worktree_base_repo, &worktree_path);
-                    return Err(SessionError::Tmux(e));
-                }
-                (None, None)
-            }
+        let spawned = {
+            let tmux = self.inner.tmux.clone();
+            let cwd = effective_cwd.clone();
+            let command = req.command.clone();
+            let sink = pipe_pane_command(&fifo_path);
+            let env = session_env.clone();
+            tmux_blocking(move || tmux.new_session_piped(id, &cwd, &command, &env, &sink)).await
         };
+        if let Err(e) = spawned {
+            // `bridge` drops at the end of this block, closing the FIFO reader.
+            let _ = std::fs::remove_file(&fifo_path);
+            self.rollback_worktree(&worktree_base_repo, &worktree_path);
+            return Err(SessionError::Tmux(e));
+        }
 
         // Capture spawn-history inputs before `req` is partially moved into
         // `session`. `history_cwd` is the *chosen* working dir (the request
@@ -539,21 +463,13 @@ impl SessionManager {
                     base_repo: base_repo.clone(),
                 },
             ),
-            status: if acp_failure.is_some() {
-                SessionStatus::Dead
-            } else {
-                SessionStatus::Running
-            },
+            status: SessionStatus::Running,
             created_at: Utc::now(),
             // A freshly-spawned session is producing its initial output; the
             // activity watcher refines `foreground`/`activity` on its next tick.
             foreground: None,
-            activity: if acp_failure.is_some() {
-                ActivityState::Error
-            } else {
-                ActivityState::Active
-            },
-            activity_detail: acp_failure,
+            activity: ActivityState::Active,
+            activity_detail: None,
             last_activity_at: Utc::now(),
             activity_since: chrono::Utc::now(),
 
@@ -562,23 +478,13 @@ impl SessionManager {
             // fresh tree has nothing in the way anyway.
             blocked_work: None,
             last_focused_at: None,
-            acp_session_id: acp.as_ref().map(|a| a.session_id().to_string()),
-            view: req.view,
         };
 
         if let Err(e) = self.inner.sidecar.write(&session) {
-            // The process already started; end it so no ghost survives a
+            // tmux already spawned the session; kill it so no ghost survives a
             // failed sidecar write, then unwind the FIFO + worktree.
-            match &acp {
-                Some(acp) => {
-                    acp.terminate(maestro_acp::CANCEL_GRACE, maestro_acp::TERM_GRACE)
-                        .await
-                }
-                None => {
-                    let tmux = self.inner.tmux.clone();
-                    let _ = tmux_blocking(move || tmux.kill_session(id)).await;
-                }
-            }
+            let tmux = self.inner.tmux.clone();
+            let _ = tmux_blocking(move || tmux.kill_session(id)).await;
             let _ = std::fs::remove_file(&fifo_path);
             self.rollback_worktree(&worktree_base_repo, &worktree_path);
             return Err(SessionError::Sidecar(e));
@@ -600,7 +506,6 @@ impl SessionManager {
                     naming: false,
                     focused_since: None,
                     awaiting_suppressed: false,
-                    acp,
                 },
             );
         }
@@ -670,9 +575,7 @@ impl SessionManager {
                         .worktree_base_repo
                         .clone()
                         .zip(record.worktree_path.clone()),
-                    // A structured session has no pane to kill; its child is
-                    // ended through the ACP handle in `cleanup_record`.
-                    record.session.status == SessionStatus::Running && record.acp.is_none(),
+                    record.session.status == SessionStatus::Running,
                 ),
             }
         };
@@ -780,10 +683,6 @@ impl SessionManager {
                     current_cwd: None,
                     blocked_work: None,
                     last_focused_at: None,
-                    acp_session_id: None,
-                    // Unknown on adoption without a sidecar; matches every
-                    // other field's forward-compat default.
-                    view: maestro_protocol::SessionView::Terminal,
                 },
             };
             let fifo_path = self.inner.fifo_dir.join(format!("{id}.fifo"));
@@ -815,9 +714,6 @@ impl SessionManager {
                     naming: false,
                     focused_since: None,
                     awaiting_suppressed: false,
-                    // A structured session's adapter died with the previous
-                    // daemon; only tmux-backed sessions can be adopted.
-                    acp: None,
                 },
             );
             let _ = self
@@ -1187,36 +1083,21 @@ async fn run_liveness_pass(inner: &Arc<Inner>) {
     // be competing to start the tmux server).
     // Only sessions we still believe are running can transition; a session
     // already marked Dead must not re-emit an update on every 2s tick.
-    // A structured session (#134) is not in tmux at all: its liveness is its
-    // adapter child, checked through the ACP handle instead.
-    let (tmux_backed, acp_backed): (Vec<Uuid>, Vec<(Uuid, Arc<AcpSession>)>) = {
+    let known: Vec<Uuid> = {
         let sessions = inner.sessions.lock().await;
         if sessions.is_empty() {
             return;
         }
-        let running = sessions
+        sessions
             .iter()
-            .filter(|(_, r)| r.session.status == SessionStatus::Running);
-        let mut tmux_backed = Vec::new();
-        let mut acp_backed = Vec::new();
-        for (id, record) in running {
-            match &record.acp {
-                Some(acp) => acp_backed.push((*id, acp.clone())),
-                None => tmux_backed.push(*id),
-            }
-        }
-        (tmux_backed, acp_backed)
+            .filter(|(_, r)| r.session.status == SessionStatus::Running)
+            .map(|(id, _)| *id)
+            .collect()
     };
-
-    for (id, acp) in acp_backed {
-        if acp.has_exited() {
-            mark_session_dead(inner, id).await;
-        }
-    }
-
-    if tmux_backed.is_empty() {
+    if known.is_empty() {
         return;
     }
+
     let live_ids = {
         let tmux = inner.tmux.clone();
         match tmux_blocking(move || tmux.list_sessions()).await {
@@ -1229,7 +1110,7 @@ async fn run_liveness_pass(inner: &Arc<Inner>) {
     };
     let live: HashSet<Uuid> = live_ids.into_iter().collect();
 
-    for id in tmux_backed {
+    for id in known {
         if !live.contains(&id) {
             mark_session_dead(inner, id).await;
         }
@@ -1435,7 +1316,7 @@ async fn mark_session_dead(inner: &Arc<Inner>, id: Uuid) {
     let Some((mut session, worktree)) = flipped else {
         return;
     };
-    tracing::info!(%id, "session process gone — marking dead");
+    tracing::info!(%id, "session vanished from tmux — marking dead");
 
     if let Some(wt) = &worktree {
         if settle_worktree_on_exit(inner, id, wt).await {
@@ -1537,11 +1418,6 @@ async fn cleanup_record(
         let tmux = inner.tmux.clone();
         let _ = tmux_blocking(move || tmux.kill_session(id)).await;
     }
-    if let Some(acp) = &record.acp {
-        // `session/cancel`, a short wait, then SIGTERM (#134).
-        acp.terminate(maestro_acp::CANCEL_GRACE, maestro_acp::TERM_GRACE)
-            .await;
-    }
     let _ = std::fs::remove_file(&record.fifo_path);
     if let Err(e) = inner.sidecar.delete(id) {
         tracing::warn!(error = ?e, %id, "cleanup: failed to delete sidecar");

crates/maestro-daemon/tests/acp.rs

@@ -1,296 +0,0 @@
-//! Structured sessions (#134): a `claude-code-acp` child per session instead
-//! of a tmux pane. Runs against the fake adapter in
-//! `crates/maestro-acp/tests/fake_acp_agent.py`; nothing here needs Claude.
-
-mod common;
-
-use std::collections::HashMap;
-use std::path::{Path, PathBuf};
-use std::time::{Duration, Instant};
-
-use common::{wait_for_async, DaemonFixture};
-use maestro_acp::{ADAPTER_BIN, INSTALL_COMMAND};
-use maestro_protocol::{ActivityState, CreateSessionRequest, SessionStatus, SessionView};
-use tempfile::TempDir;
-
-fn fake_agent() -> PathBuf {
-    Path::new(env!("CARGO_MANIFEST_DIR")).join("../maestro-acp/tests/fake_acp_agent.py")
-}
-
-/// The fake adapter installed as `claude-code-acp` in a temp `bin/`, with
-/// the log file it appends to. `env()` is what a spawn request carries.
-struct Fake {
-    dir: TempDir,
-}
-
-impl Fake {
-    fn new() -> Self {
-        let dir = TempDir::new().unwrap();
-        let bin = dir.path().join("bin");
-        std::fs::create_dir_all(&bin).unwrap();
-        std::fs::copy(fake_agent(), bin.join(ADAPTER_BIN)).unwrap();
-        Self { dir }
-    }
-
-    fn log_path(&self) -> PathBuf {
-        self.dir.path().join("agent.log")
-    }
-
-    fn log(&self) -> String {
-        std::fs::read_to_string(self.log_path()).unwrap_or_default()
-    }
-
-    /// Fake `bin/` first so it shadows any real adapter, then the process
-    /// `PATH` so the script's `python3` still resolves.
-    fn env(&self) -> HashMap<String, String> {
-        let path = format!(
-            "{}:{}",
-            self.dir.path().join("bin").display(),
-            std::env::var("PATH").unwrap_or_default()
-        );
-        HashMap::from([
-            ("PATH".to_string(), path),
-            (
-                "FAKE_ACP_LOG".to_string(),
-                self.log_path().to_string_lossy().into_owned(),
-            ),
-        ])
-    }
-
-    /// The pid the fake logged at start, once it has.
-    fn pid(&self) -> u32 {
-        self.log()
-            .lines()
-            .find_map(|l| l.strip_prefix("start pid="))
-            .and_then(|rest| rest.split(' ').next())
-            .and_then(|p| p.parse().ok())
-            .expect("pid in log")
-    }
-}
-
-fn structured(cwd: &Path, env: HashMap<String, String>) -> CreateSessionRequest {
-    CreateSessionRequest {
-        view: SessionView::Structured,
-        cwd: cwd.to_path_buf(),
-        command: "claude".into(),
-        env,
-        metadata: HashMap::new(),
-        worktree: None,
-    }
-}
-
-fn pid_alive(pid: u32) -> bool {
-    std::fs::read_to_string(format!("/proc/{pid}/stat"))
-        .map(|s| !s.contains(") Z "))
-        .unwrap_or(false)
-}
-
-async fn wait_for_exit(pid: u32) {
-    let deadline = Instant::now() + Duration::from_secs(5);
-    while pid_alive(pid) && Instant::now() < deadline {
-        tokio::time::sleep(Duration::from_millis(20)).await;
-    }
-    assert!(!pid_alive(pid), "pid {pid} still alive");
-}
-
-#[tokio::test]
-async fn structured_spawn_starts_the_adapter_in_cwd_with_session_env() {
-    let fx = DaemonFixture::new();
-    let fake = Fake::new();
-    let cwd = TempDir::new().unwrap();
-    let mut env = fake.env();
-    env.insert("FAKE_ACP_ECHO_ENV".into(), "MAESTRO_SESSION_ID".into());
-
-    let session = fx
-        .manager
-        .create(structured(cwd.path(), env))
-        .await
-        .expect("create");
-
-    assert_eq!(session.view, SessionView::Structured);
-    assert_eq!(session.status, SessionStatus::Running);
-    let acp_id = session.acp_session_id.clone().expect("acp session id");
-    assert!(acp_id.starts_with("fake-"), "{acp_id}");
-
-    // The child ran in the session cwd with the session's env — including
-    // the identity the daemon injects, so the agent knows which session it
-    // is (#103).
-    let log = fake.log();
-    let cwd_canon = cwd.path().canonicalize().unwrap();
-    assert!(
-        log.contains(&format!("cwd={}", cwd_canon.display())),
-        "{log}"
-    );
-    assert!(
-        log.contains(&format!("env MAESTRO_SESSION_ID={}", session.id)),
-        "{log}"
-    );
-
-    // No tmux pane was created for it: the agent is the daemon's child.
-    let panes = fx.tmux.tmux.list_sessions().expect("list");
-    assert!(
-        !panes.contains(&session.id),
-        "structured session got a tmux pane"
-    );
-
-    // The sidecar carries the id a respawn will pass to session/load (#135).
-    let sidecar: maestro_protocol::Session = serde_json::from_slice(
-        &std::fs::read(fx.sidecar_dir().join(format!("{}.json", session.id))).unwrap(),
-    )
-    .unwrap();
-    assert_eq!(sidecar.acp_session_id.as_deref(), Some(acp_id.as_str()));
-
-    // The raw notification stream is reachable for #135, handed out once.
-    let mut updates = fx
-        .manager
-        .take_acp_updates(session.id)
-        .await
-        .expect("updates receiver");
-    assert!(fx.manager.take_acp_updates(session.id).await.is_none());
-    let first = tokio::time::timeout(Duration::from_secs(5), updates.recv())
-        .await
-        .expect("an update within 5s")
-        .expect("channel open");
-    assert_eq!(first.session_id.0.as_ref(), acp_id);
-
-    fx.manager.kill(session.id, false).await.expect("kill");
-}
-
-#[tokio::test]
-async fn missing_adapter_yields_a_failed_session_naming_the_install_command() {
-    let fx = DaemonFixture::new();
-    let empty = TempDir::new().unwrap();
-    let cwd = TempDir::new().unwrap();
-    let env = HashMap::from([(
-        "PATH".to_string(),
-        empty.path().to_string_lossy().into_owned(),
-    )]);
-
-    let session = fx
-        .manager
-        .create(structured(cwd.path(), env))
-        .await
-        .expect("a failed session, not an error");
-
-    assert_eq!(session.status, SessionStatus::Dead);
-    assert_eq!(session.activity, ActivityState::Error);
-    let detail = session.activity_detail.clone().expect("actionable detail");
-    assert!(detail.contains(ADAPTER_BIN), "{detail}");
-    assert!(detail.contains(INSTALL_COMMAND), "{detail}");
-    assert_eq!(session.acp_session_id, None);
-
-    // It is a real session: listed, on disk, and dismissable like any other
-    // dead one.
-    assert!(fx.manager.has(session.id).await);
-    assert!(fx
-        .sidecar_dir()
-        .join(format!("{}.json", session.id))
-        .exists());
-    fx.manager.kill(session.id, false).await.expect("dismiss");
-    assert!(!fx.manager.has(session.id).await);
-}
-
-#[tokio::test]
-async fn kill_sends_cancel_then_sigterm_and_removes_the_sidecar() {
-    let fx = DaemonFixture::new();
-    let fake = Fake::new();
-    let cwd = TempDir::new().unwrap();
-    let mut events = fx.manager.events();
-
-    let session = fx
-        .manager
-        .create(structured(cwd.path(), fake.env()))
-        .await
-        .expect("create");
-    let pid = fake.pid();
-    assert!(pid_alive(pid));
-
-    fx.manager.kill(session.id, false).await.expect("kill");
-
-    wait_for_exit(pid).await;
-    let log = fake.log();
-    let cancel = log.find("recv session/cancel").expect("cancel logged");
-    let term = log.find("signal SIGTERM").expect("SIGTERM logged");
-    assert!(cancel < term, "cancel must precede SIGTERM:\n{log}");
-    assert!(!fx.manager.has(session.id).await);
-    assert!(!fx
-        .sidecar_dir()
-        .join(format!("{}.json", session.id))
-        .exists());
-
-    let mut removed = false;
-    while let Ok(ev) = events.try_recv() {
-        if matches!(ev, maestro_protocol::CatalogEvent::SessionRemoved { id } if id == session.id) {
-            removed = true;
-        }
-    }
-    assert!(removed, "SessionRemoved never broadcast");
-}
-
-#[tokio::test]
-async fn shutdown_reaps_every_adapter_child() {
-    let fx = DaemonFixture::new();
-    let cwd = TempDir::new().unwrap();
-    let a = Fake::new();
-    let b = Fake::new();
-
-    let sa = fx
-        .manager
-        .create(structured(cwd.path(), a.env()))
-        .await
-        .expect("create a");
-    let sb = fx
-        .manager
-        .create(structured(cwd.path(), b.env()))
-        .await
-        .expect("create b");
-    let (pa, pb) = (a.pid(), b.pid());
-    assert!(pid_alive(pa) && pid_alive(pb));
-
-    fx.manager.shutdown().await;
-
-    wait_for_exit(pa).await;
-    wait_for_exit(pb).await;
-    assert!(a.log().contains("signal SIGTERM"), "{}", a.log());
-    assert!(b.log().contains("signal SIGTERM"), "{}", b.log());
-    // Still listed, now Dead: the sidecar is truthful for whoever reads it
-    // after the restart (#135).
-    assert_eq!(fx.manager.status(sa.id).await, Some(SessionStatus::Dead));
-    assert_eq!(fx.manager.status(sb.id).await, Some(SessionStatus::Dead));
-    let sidecar: maestro_protocol::Session = serde_json::from_slice(
-        &std::fs::read(fx.sidecar_dir().join(format!("{}.json", sa.id))).unwrap(),
-    )
-    .unwrap();
-    assert_eq!(sidecar.status, SessionStatus::Dead);
-}
-
-#[tokio::test]
-async fn adapter_exit_marks_the_session_dead_and_keeps_it_listed() {
-    let fx = DaemonFixture::new();
-    let fake = Fake::new();
-    let cwd = TempDir::new().unwrap();
-
-    let session = fx
-        .manager
-        .create(structured(cwd.path(), fake.env()))
-        .await
-        .expect("create");
-    fx.manager.start_liveness_watcher(Duration::from_millis(50));
-
-    // The agent dies out from under the daemon: the liveness pass, not tmux,
-    // is what notices for a structured session.
-    let pid = fake.pid();
-    unsafe {
-        libc::kill(pid as libc::pid_t, libc::SIGTERM);
-    }
-    wait_for_exit(pid).await;
-
-    wait_for_async(Duration::from_secs(3), || async {
-        fx.manager.status(session.id).await == Some(SessionStatus::Dead)
-    })
-    .await;
-    assert!(fx.manager.has(session.id).await);
-
-    fx.manager.kill(session.id, false).await.expect("dismiss");
-    assert!(!fx.manager.has(session.id).await);
-}

crates/maestro-daemon/tests/activity_report.rs

@@ -42,7 +42,6 @@ async fn fixture(ttl: Duration) -> Fixture {
 async fn spawn_sleeping(manager: &SessionManager) -> Uuid {
     manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: "/tmp".into(),
             command: "sleep 60".into(),
             env: Default::default(),

crates/maestro-daemon/tests/attach.rs

@@ -75,7 +75,6 @@ async fn create_bash_session(h: &Harness) -> Uuid {
     let s = h
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd_path,
             command: "bash --noprofile --norc".into(),
             env: HashMap::new(),

crates/maestro-daemon/tests/autoname.rs

@@ -50,7 +50,6 @@ async fn spawn(manager: &SessionManager, name: Option<&str>) -> Uuid {
     };
     manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: "/tmp".into(),
             command: "sleep 60".into(),
             env: Default::default(),

crates/maestro-daemon/tests/blocked_work_cost.rs

@@ -19,7 +19,6 @@ use tempfile::TempDir;
 
 fn request(cwd: &std::path::Path, repo: &std::path::Path, branch: &str) -> CreateSessionRequest {
     CreateSessionRequest {
-        view: Default::default(),
         cwd: cwd.to_path_buf(),
         command: "sleep 30".into(),
         env: HashMap::new(),

crates/maestro-daemon/tests/local_api.rs

@@ -174,7 +174,6 @@ async fn list_sessions_starts_empty_and_reflects_creates() {
     assert!(empty.is_empty());
 
     let req = CreateSessionRequest {
-        view: Default::default(),
         cwd: "/tmp".into(),
         command: "sleep 60".into(),
         env: HashMap::new(),
@@ -391,7 +390,6 @@ async fn patch_session_renames_it() {
     let session = h
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: "/tmp".into(),
             command: "sleep 60".into(),
             env: HashMap::new(),
@@ -434,7 +432,6 @@ async fn post_focus_stamps_last_focused_at() {
     let session = h
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: "/tmp".into(),
             command: "sleep 60".into(),
             env: HashMap::new(),
@@ -468,7 +465,6 @@ async fn delete_owned_session_kills_it() {
     let session = h
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: "/tmp".into(),
             command: "sleep 60".into(),
             env: HashMap::new(),
@@ -490,7 +486,6 @@ async fn delete_owned_session_kills_it() {
 async fn spawn_via_manager(h: &Harness) -> Uuid {
     h.manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: "/tmp".into(),
             command: "sleep 60".into(),
             env: HashMap::new(),
@@ -600,7 +595,6 @@ async fn delete_a_session_whose_worktree_holds_unsaved_work_returns_409_with_the
     let session = h
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 60".into(),
             env: HashMap::new(),
@@ -653,7 +647,6 @@ async fn delete_with_force_ends_the_session_and_keeps_the_worktree() {
     let session = h
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 60".into(),
             env: HashMap::new(),
@@ -687,7 +680,6 @@ async fn attach_ws_streams_pty_bytes() {
     let session = h
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: "/tmp".into(),
             command: "bash --noprofile --norc".into(),
             env: HashMap::new(),
@@ -756,7 +748,6 @@ async fn events_ws_sends_a_snapshot_then_streams_deltas() {
     let created = h
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -801,7 +792,6 @@ async fn every_events_subscriber_gets_its_own_snapshot() {
 
     h.manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),

crates/maestro-daemon/tests/rename.rs

@@ -51,7 +51,6 @@ async fn spawn_named(manager: &SessionManager, name: Option<&str>) -> Uuid {
     };
     manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: "/tmp".into(),
             command: "sleep 60".into(),
             env: Default::default(),

crates/maestro-daemon/tests/session_decisions.rs

@@ -64,7 +64,6 @@ impl Fx {
 
     fn request(&self, command: &str) -> CreateSessionRequest {
         CreateSessionRequest {
-            view: Default::default(),
             cwd: self.tmp.path().to_path_buf(),
             command: command.into(),
             env: HashMap::new(),

crates/maestro-daemon/tests/session_manager.rs

@@ -22,7 +22,6 @@ async fn create_then_kill_round_trip() {
     let session = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -64,7 +63,6 @@ async fn create_appends_to_spawn_history() {
     let session = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -94,7 +92,6 @@ async fn create_without_history_logs_nothing() {
     let cwd = TempDir::new().unwrap();
     fx.manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -117,7 +114,6 @@ async fn recover_adopts_existing_tmux_sessions() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -157,7 +153,6 @@ async fn create_captures_initial_output_in_replay_buffer() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             // The shell prints the marker before doing anything else and
             // then sleeps so the session stays alive. Before NAP-253 this
@@ -205,7 +200,6 @@ async fn attach_replay_is_the_current_screen_not_the_byte_tail() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-        view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             // Print a line, then switch to the alternate screen the way a
             // full-screen program does on startup. Only the second marker is
@@ -264,7 +258,6 @@ async fn attach_replay_carries_the_panes_mouse_modes() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-        view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             // Alternate screen, then button-event tracking (?1002) with SGR
             // coordinates (?1006) — what tmux and agent TUIs actually request.
@@ -318,7 +311,6 @@ async fn recover_re_pipes_pane_so_output_reaches_subscribers() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "bash --noprofile --norc".into(),
             env: HashMap::new(),
@@ -381,7 +373,6 @@ async fn pty_broadcast_delivers_bytes_to_subscribers() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "bash --noprofile --norc".into(),
             env: HashMap::new(),
@@ -432,7 +423,6 @@ async fn liveness_watcher_marks_dead_sessions_and_keeps_them_until_dismissed() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -498,7 +488,6 @@ async fn watcher_refreshes_the_blocked_work_indicator() {
 
     fx.manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -591,7 +580,6 @@ async fn kill_removes_worktree_even_when_spec_says_keep() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -629,7 +617,6 @@ async fn killing_refuses_a_worktree_with_unsaved_work_and_keeps_the_session() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -693,7 +680,6 @@ async fn killing_refuses_until_the_branch_is_pushed() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -743,7 +729,6 @@ async fn force_killing_a_guarded_worktree_leaves_it_on_disk() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -789,7 +774,6 @@ async fn force_on_a_clear_worktree_removes_it_as_usual() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -830,7 +814,6 @@ async fn killing_an_ignored_only_worktree_succeeds() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -872,7 +855,6 @@ async fn natural_exit_of_a_guarded_worktree_leaves_it_on_disk() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -934,7 +916,6 @@ async fn natural_exit_of_a_pristine_worktree_removes_it() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -995,7 +976,6 @@ async fn liveness_watcher_leaves_running_sessions_alone() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -1030,7 +1010,6 @@ async fn worktree_base_repo_records_the_main_checkout_not_the_request() {
     let first = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: repo.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -1048,7 +1027,6 @@ async fn worktree_base_repo_records_the_main_checkout_not_the_request() {
     let second = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: inner_worktree.clone(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -1087,7 +1065,6 @@ async fn spawned_sessions_export_maestro_session_id_and_url() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -1126,7 +1103,6 @@ async fn a_freshly_created_session_has_never_been_focused() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -1152,7 +1128,6 @@ async fn set_focused_true_stamps_last_focused_at() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),
@@ -1201,7 +1176,6 @@ async fn attaching_stamps_last_focused_at() {
     let s = fx
         .manager
         .create(CreateSessionRequest {
-            view: Default::default(),
             cwd: cwd.path().to_path_buf(),
             command: "sleep 30".into(),
             env: HashMap::new(),

crates/maestro-daemon/tests/sidecar.rs

@@ -7,7 +7,7 @@ use std::path::PathBuf;
 
 use chrono::{DateTime, Utc};
 use maestro_daemon::sidecar::SidecarStore;
-use maestro_protocol::{Session, SessionStatus, SessionView};
+use maestro_protocol::{Session, SessionStatus};
 use serde_json::Value;
 use tempfile::TempDir;
 use uuid::Uuid;
@@ -32,8 +32,6 @@ fn sample(id: Uuid) -> Session {
         current_cwd: Some(PathBuf::from("/tmp/work/crates")),
         blocked_work: None,
         last_focused_at: None,
-        acp_session_id: None,
-        view: SessionView::Terminal,
     }
 }
 
@@ -105,37 +103,6 @@ fn load_all_returns_empty_when_directory_missing() {
     assert!(store.load_all().unwrap().is_empty());
 }
 
-#[test]
-fn sidecar_missing_view_key_reads_as_terminal() {
-    // A pre-#133 sidecar on disk has no `view` field at all.
-    let dir = TempDir::new().unwrap();
-    let store = SidecarStore::new(dir.path());
-    let id = Uuid::new_v4();
-
-    let mut value = serde_json::to_value(sample(id)).unwrap();
-    value.as_object_mut().unwrap().remove("view");
-    std::fs::write(store.path_for(id), serde_json::to_vec(&value).unwrap()).unwrap();
-
-    let loaded = store.read(id).expect("read").expect("present");
-    assert_eq!(loaded.view, SessionView::Terminal);
-}
-
-#[test]
-fn sidecar_structured_view_round_trips() {
-    let dir = TempDir::new().unwrap();
-    let store = SidecarStore::new(dir.path());
-    let id = Uuid::new_v4();
-    let mut s = sample(id);
-    s.view = SessionView::Structured;
-
-    store.write(&s).expect("write");
-    let loaded = store.read(id).expect("read");
-    assert_eq!(
-        loaded.as_ref().map(|s| s.view),
-        Some(SessionView::Structured)
-    );
-}
-
 #[test]
 fn write_creates_parent_directory() {
     let dir = TempDir::new().unwrap();

crates/maestro-daemon/tests/worktree.rs

@@ -405,10 +405,8 @@ fn run_git(dir: &std::path::Path, args: &[&str]) {
     );
 }
 
-/// 49ab7e9: a new-branch add onto a name that already exists suffixes the
-/// branch (and so the directory) instead of failing, per docs/WORKTREES.md.
 #[test]
-fn add_new_suffixes_when_branch_already_exists() {
+fn add_fails_when_branch_already_exists() {
     let repo_dir = TempDir::new().unwrap();
     let repo = repo_dir.path().to_path_buf();
     init_repo(&repo);
@@ -425,9 +423,9 @@ fn add_new_suffixes_when_branch_already_exists() {
     let wt_root = TempDir::new().unwrap();
     let mgr = WorktreeManager::new(Some(wt_root.path().to_path_buf()));
 
-    let path = mgr.add_new(&repo, "feat/dup").unwrap();
-    assert!(path.ends_with("feat/dup-2"), "{}", path.display());
-    assert!(path.is_dir());
+    let err = mgr.add_new(&repo, "feat/dup").unwrap_err();
+    let msg = format!("{err}");
+    assert!(msg.contains("git exited"), "{msg}");
 }
 
 /// The project picker lists linked worktrees as pickable rows, so `base_repo`

crates/maestro-e2e/tests/e2e.rs

@@ -27,7 +27,6 @@ async fn bring_up() -> (Daemon, TestClient) {
 
 fn create_req(cwd: &std::path::Path, command: &str) -> CreateSessionRequest {
     CreateSessionRequest {
-        view: Default::default(),
         cwd: cwd.to_path_buf(),
         command: command.into(),
         env: HashMap::new(),
@@ -50,7 +49,6 @@ fn worktree_spec(base_repo: &std::path::Path, branch: &str, create_branch: bool)
 /// Spawn request carrying a worktree spec against `base`.
 fn worktree_req(base: &std::path::Path, branch: &str, create_branch: bool) -> CreateSessionRequest {
     CreateSessionRequest {
-        view: Default::default(),
         cwd: base.to_path_buf(),
         command: "sleep 30".into(),
         env: HashMap::new(),
@@ -145,7 +143,6 @@ async fn kill_removes_clean_worktree() {
     init_repo(base.path());
 
     let req = CreateSessionRequest {
-        view: Default::default(),
         cwd: base.path().to_path_buf(),
         command: "sleep 30".into(),
         env: HashMap::new(),
@@ -199,7 +196,6 @@ async fn kill_refuses_worktree_with_uncommitted_changes() {
         .join("unsaved");
 
     let req = CreateSessionRequest {
-        view: Default::default(),
         cwd: base.path().to_path_buf(),
         command: "sleep 30".into(),
         env: HashMap::new(),
@@ -258,7 +254,6 @@ async fn spawn_on_existing_branch_checks_it_out() {
     run_git(&["branch", "feature/existing"], base.path());
 
     let req = CreateSessionRequest {
-        view: Default::default(),
         cwd: base.path().to_path_buf(),
         command: "sleep 30".into(),
         env: HashMap::new(),
@@ -328,11 +323,8 @@ async fn spawn_new_branch_creates_worktree_and_runs_in_it() {
     client.kill_session(s.id).await.expect("kill");
 }
 
-/// #66: a second spawn onto an *existing* branch that already has a worktree
-/// is rejected with a structured worktree error; the first worktree stays
-/// intact. (A second `create_branch: true` spawn is a different case: 49ab7e9
-/// suffixes the new branch name instead, see
-/// `colliding_branch_name_gets_suffixed_too`.)
+/// #66: a second spawn onto a branch that already has a worktree is rejected
+/// with a structured worktree error; the first worktree stays intact.
 #[tokio::test(flavor = "multi_thread")]
 async fn second_spawn_on_same_branch_is_rejected() {
     let (_daemon, client) = bring_up().await;
@@ -345,7 +337,7 @@ async fn second_spawn_on_same_branch_is_rejected() {
         .await
         .expect("first spawn");
     let dup = client
-        .spawn_session(&worktree_req(base.path(), "feature/dup", false))
+        .spawn_session(&worktree_req(base.path(), "feature/dup", true))
         .await;
     match dup {
         Err(maestro_e2e::ClientError::Api(maestro_protocol::ClientError::Api { info, .. })) => {
@@ -762,7 +754,6 @@ async fn natural_exit_settles_dirty_and_pristine_worktrees_differently() {
 
     let _dirty = client
         .spawn_session(&CreateSessionRequest {
-            view: Default::default(),
             cwd: dirty_repo.path().to_path_buf(),
             command: "sh -c 'echo unsaved > scratch.txt'".into(),
             env: HashMap::new(),
@@ -811,7 +802,6 @@ async fn natural_exit_settles_dirty_and_pristine_worktrees_differently() {
 
 fn create_req_cmd(cwd: &std::path::Path, command: &str, branch: &str) -> CreateSessionRequest {
     CreateSessionRequest {
-        view: Default::default(),
         cwd: cwd.to_path_buf(),
         command: command.into(),
         env: HashMap::new(),

crates/maestro-protocol/src/display.rs

@@ -268,7 +268,6 @@ mod tests {
 
     fn session(cwd: &str) -> Session {
         Session {
-            view: Default::default(),
             id: Uuid::from_u128(1),
             cwd: PathBuf::from(cwd),
             command: "bash".into(),
@@ -285,7 +284,6 @@ mod tests {
             current_cwd: None,
             blocked_work: None,
             last_focused_at: None,
-            acp_session_id: None,
         }
     }
 

crates/maestro-protocol/src/lib.rs

@@ -116,33 +116,6 @@ pub struct Session {
     /// sorts a never-focused session after every session that has one.
     #[serde(default)]
     pub last_focused_at: Option<DateTime<Utc>>,
-    /// Whether this session's process is a plain terminal (PTY bytes through
-    /// tmux) or a structured agent driven over ACP rows (#133). Fixed at
-    /// spawn time and never changes for the life of the session. Defaults to
-    /// `Terminal` on the wire so every existing client and payload from a
-    /// daemon that predates the field keeps working untouched.
-    #[serde(default)]
-    pub view: SessionView,
-    /// The ACP session id the `claude-code-acp` adapter handed back from
-    /// `session/new` (#134). Only a [`SessionView::Structured`] session has
-    /// one, and only once its handshake succeeded; a later respawn passes it
-    /// to `session/load` so the conversation continues (#135). Distinct from
-    /// the hook-reported Claude Code conversation id (#161): that one is what
-    /// `claude --resume` takes, this one is what the ACP adapter takes, and
-    /// the two are minted by different processes with different lifetimes.
-    #[serde(default, skip_serializing_if = "Option::is_none")]
-    pub acp_session_id: Option<String>,
-}
-
-/// A session's process shape (#133): a plain terminal, or a structured agent
-/// driven over ACP rows. Chosen at spawn and immutable for the session's
-/// life. `Terminal` is the default — every sidecar and `CreateSessionRequest`
-/// written before this field existed meant a terminal session.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
-pub enum SessionView {
-    #[default]
-    Terminal,
-    Structured,
 }
 
 /// Default for [`Session::last_activity_at`] when an older payload omits it.
@@ -379,11 +352,6 @@ pub struct CreateSessionRequest {
     pub metadata: HashMap<String, Value>,
     #[serde(default)]
     pub worktree: Option<WorktreeSpec>,
-    /// The process shape to spawn (#133). Defaulted so every existing client
-    /// and `curl` against the API keeps requesting a `Terminal` session
-    /// untouched.
-    #[serde(default)]
-    pub view: SessionView,
 }
 
 /// Result of `GET /api/dirs`: the immediate subdirectories of one directory.
@@ -894,8 +862,6 @@ mod tests {
             current_cwd: Some(PathBuf::from("/home/naps62/projects/maestro/crates")),
             blocked_work: None,
             last_focused_at: None,
-            view: SessionView::Terminal,
-            acp_session_id: None,
         }
     }
 
@@ -1107,7 +1073,6 @@ mod tests {
                 branch: "feat/foo".into(),
                 create_branch: true,
             }),
-            view: SessionView::Terminal,
         };
         assert_eq!(req, round_trip(&req));
     }
@@ -1122,49 +1087,6 @@ mod tests {
         assert!(req.worktree.is_none());
         assert!(req.env.is_empty());
         assert!(req.metadata.is_empty());
-        assert_eq!(req.view, SessionView::Terminal);
-    }
-
-    #[test]
-    fn session_view_defaults_to_terminal_on_legacy_payload() {
-        // A pre-#133 daemon or client omits `view`; it must deserialize to
-        // `Terminal` rather than failing, and `Structured` round-trips.
-        let json = serde_json::json!({
-            "id": Uuid::from_u128(1),
-            "cwd": "/tmp",
-            "command": "bash",
-            "status": "Running",
-            "created_at": "2026-05-24T12:00:00Z"
-        });
-        let s: Session = serde_json::from_value(json).unwrap();
-        assert_eq!(s.view, SessionView::Terminal);
-
-        let mut structured = sample_session();
-        structured.view = SessionView::Structured;
-        assert_eq!(structured, round_trip(&structured));
-    }
-
-    #[test]
-    fn acp_session_id_defaults_to_none_and_round_trips() {
-        // A payload from before #134 carries no `acp_session_id`; it must
-        // read as `None`, stay off the wire while unset, and round-trip
-        // once the adapter has handed one back.
-        let json = serde_json::json!({
-            "id": Uuid::from_u128(1),
-            "cwd": "/tmp",
-            "command": "bash",
-            "status": "Running",
-            "created_at": "2026-05-24T12:00:00Z"
-        });
-        let s: Session = serde_json::from_value(json).unwrap();
-        assert_eq!(s.acp_session_id, None);
-        let serialized = serde_json::to_value(&s).unwrap();
-        assert!(serialized.get("acp_session_id").is_none());
-
-        let mut structured = sample_session();
-        structured.view = SessionView::Structured;
-        structured.acp_session_id = Some("sess_01HZX".into());
-        assert_eq!(structured, round_trip(&structured));
     }
 
     /// A client that predates the new/existing discriminator sends no

crates/maestro-testing/src/lib.rs

@@ -31,7 +31,6 @@ use uuid::Uuid;
 /// Build a plausible `Session` for a test to hand to [`MockDaemon::add_session`].
 pub fn session(id: Uuid, cwd: &str, command: &str) -> Session {
     Session {
-        view: Default::default(),
         id,
         cwd: cwd.into(),
         command: command.into(),
@@ -48,7 +47,6 @@ pub fn session(id: Uuid, cwd: &str, command: &str) -> Session {
         current_cwd: None,
         blocked_work: None,
         last_focused_at: None,
-        acp_session_id: None,
     }
 }
 

crates/maestro-tui/src/app.rs

@@ -1882,7 +1882,6 @@ mod tests {
             sessions: ids
                 .iter()
                 .map(|id| Session {
-                    view: Default::default(),
                     id: *id,
                     command: "bash".into(),
                     cwd: std::path::PathBuf::from("/"),
@@ -1899,7 +1898,6 @@ mod tests {
                     current_cwd: None,
                     blocked_work: None,
                     last_focused_at: None,
-                    acp_session_id: None,
                 })
                 .collect(),
         });
@@ -2065,7 +2063,6 @@ mod tests {
         let mut app = make_app();
         app.catalog.apply_event(CatalogEvent::Snapshot {
             sessions: vec![Session {
-                view: Default::default(),
                 id: sid,
                 command: "bash".into(),
                 cwd: std::path::PathBuf::from("/"),
@@ -2082,7 +2079,6 @@ mod tests {
                 current_cwd: None,
                 blocked_work: None,
                 last_focused_at: None,
-                acp_session_id: None,
             }],
         });
         app.dispatch(Action::SidebarNext);
@@ -2094,7 +2090,6 @@ mod tests {
         use chrono::Utc;
         use maestro_protocol::{Session, SessionStatus};
         Session {
-            view: Default::default(),
             id: sid,
             command: "bash".into(),
             cwd: cwd.into(),
@@ -2111,7 +2106,6 @@ mod tests {
             current_cwd: None,
             blocked_work: None,
             last_focused_at: None,
-            acp_session_id: None,
         }
     }
 
@@ -2783,7 +2777,6 @@ mod tests {
         );
         app.dispatch(Action::OpenSpawnModal);
         let req = CreateSessionRequest {
-            view: Default::default(),
             cwd: std::path::PathBuf::from("/srv/work"),
             command: "bash".into(),
             env: Default::default(),
@@ -3202,7 +3195,6 @@ mod tests {
         use chrono::Utc;
         use maestro_protocol::{CatalogEvent, Session, SessionStatus};
         let make = |n: u128, name: &str, focused: Option<chrono::DateTime<Utc>>| Session {
-            view: Default::default(),
             id: Uuid::from_u128(n),
             command: "bash".into(),
             cwd: std::path::PathBuf::from("/"),
@@ -3222,7 +3214,6 @@ mod tests {
             current_cwd: None,
             blocked_work: None,
             last_focused_at: focused,
-            acp_session_id: None,
         };
         let older = Utc::now() - chrono::Duration::seconds(60);
         app.catalog.apply_event(CatalogEvent::Snapshot {
@@ -3484,7 +3475,6 @@ mod tests {
         let sid = Uuid::from_u128(7);
         app.catalog.apply_event(CatalogEvent::Snapshot {
             sessions: vec![Session {
-                view: Default::default(),
                 id: sid,
                 command: "bash".into(),
                 cwd: std::path::PathBuf::from("/"),
@@ -3502,7 +3492,6 @@ mod tests {
                 current_cwd: None,
                 blocked_work: None,
                 last_focused_at: None,
-                acp_session_id: None,
             }],
         });
         app.dispatch(Action::KillHighlighted);
@@ -3522,7 +3511,6 @@ mod tests {
         };
         app.catalog.apply_event(CatalogEvent::Snapshot {
             sessions: vec![Session {
-                view: Default::default(),
                 id: sid,
                 command: "bash".into(),
                 cwd: std::path::PathBuf::from("/"),
@@ -3539,7 +3527,6 @@ mod tests {
                 current_cwd: None,
                 blocked_work: None,
                 last_focused_at: None,
-                acp_session_id: None,
             }],
         });
     }

crates/maestro-tui/src/catalog.rs

@@ -207,7 +207,6 @@ mod tests {
 
     fn session(id: u128, command: &str) -> Session {
         Session {
-            view: Default::default(),
             id: Uuid::from_u128(id),
             command: command.into(),
             cwd: std::path::PathBuf::from("/tmp"),
@@ -224,7 +223,6 @@ mod tests {
             current_cwd: None,
             blocked_work: None,
             last_focused_at: None,
-            acp_session_id: None,
         }
     }
 

crates/maestro-tui/src/command_bar.rs

@@ -793,7 +793,6 @@ mod tests {
 
     fn session(n: u128, command: &str) -> Session {
         Session {
-            view: Default::default(),
             id: Uuid::from_u128(n),
             cwd: PathBuf::from("/home/me/dev/api"),
             command: command.to_string(),
@@ -810,7 +809,6 @@ mod tests {
             current_cwd: None,
             blocked_work: None,
             last_focused_at: None,
-            acp_session_id: None,
         }
     }
 

crates/maestro-tui/src/draft.rs

@@ -694,7 +694,6 @@ impl DraftPane {
         }
         let worktree = self.build_worktree()?;
         Ok(CreateSessionRequest {
-            view: Default::default(),
             cwd,
             command: command.to_string(),
             env: Default::default(),

crates/maestro-tui/src/fast_forward.rs

@@ -108,7 +108,6 @@ impl FastForwardDefaults {
             return None;
         }
         Some(CreateSessionRequest {
-            view: Default::default(),
             cwd: project.path.clone(),
             command: command.to_string(),
             env: Default::default(),

crates/maestro-tui/src/sidebar.rs

@@ -484,7 +484,6 @@ mod tests {
         let mut metadata = HashMap::new();
         metadata.insert("name".into(), serde_json::Value::String(name.into()));
         Session {
-            view: Default::default(),
             id: Uuid::from_u128(id),
             command: "bash".into(),
             cwd: std::path::PathBuf::from("/tmp"),
@@ -501,7 +500,6 @@ mod tests {
             current_cwd: None,
             blocked_work: None,
             last_focused_at: None,
-            acp_session_id: None,
         }
     }
 
@@ -1252,7 +1250,6 @@ mod tests {
     #[test]
     fn falls_back_to_command_when_name_metadata_is_absent() {
         let s = Session {
-            view: Default::default(),
             id: Uuid::from_u128(1),
             command: "vim".into(),
             cwd: std::path::PathBuf::from("/tmp"),
@@ -1269,7 +1266,6 @@ mod tests {
             current_cwd: None,
             blocked_work: None,
             last_focused_at: None,
-            acp_session_id: None,
         };
         let sb = Sidebar {
             sessions: vec![s],

docs/INSTALL.md

@@ -188,29 +188,6 @@ An unknown name is rejected as an `[tui].theme` configuration error.
 The full action vocabulary is the `Action` enum in
 `crates/maestro-tui/src/action.rs`.
 
-## Structured sessions: `claude-code-acp`
-
-A session spawned with `view: Structured` (#134) runs Claude Code as a child
-of the daemon over the Agent Client Protocol instead of in a tmux pane. The
-daemon resolves the adapter binary, `claude-code-acp`, on its `PATH` at spawn
-time. Install it once per host:
-
-```sh
-npm install -g --prefix ~/.local @zed-industries/claude-code-acp
-```
-
-That puts `claude-code-acp` in `~/.local/bin`, which must be on the daemon's
-`PATH` (a systemd user unit does not read your shell profile; set
-`Environment=PATH=…` in the unit or install somewhere already on it). The
-adapter needs a logged-in Claude Code (`claude /login`).
-
-When the adapter is missing the spawn still creates the session, marked dead
-with the install command above as its activity detail, so the sidebar says
-what to run. The adapter is a child of the daemon: it ends with a `DELETE
-/api/sessions/:id` (`session/cancel`, then `SIGTERM`) and with the daemon
-itself. Terminal sessions keep surviving restarts through tmux; structured
-ones do not yet.
-
 ## The browser UI
 
 The daemon serves the SPA off its own listener. Open

docs/SIDEBAR.md

@@ -307,10 +307,9 @@ lands on the first row it was hiding. A highlight parked on a skipped row —
 reachable by clicking a folder header — still steps to its neighbour rather
 than jumping to the end of the list.
 
-The web client needs a chord to reach the list at all (leader-`h` — `Ctrl+A h`
-by default — and the same chord back): an attached terminal owns every plain
-keystroke, and Escape is left to reach the pane's shell/app instead. The TUI
-uses `ctrl-w h`.
+The web client needs a chord to reach the list at all (`Ctrl+Shift+H`, and the
+same chord back): an attached terminal owns every plain keystroke. The TUI uses
+`ctrl-w h`.
 
 Everything else is the same key on both clients:
 

web/src/attach.ts

@@ -4,6 +4,8 @@ import { Terminal } from "@xterm/xterm";
 import "@xterm/xterm/css/xterm.css";
 
 import { attachWsUrl } from "./routes.js";
+import { FOCUS_SIDEBAR_EVENT } from "./catalog.js";
+import { CommandSet, defineCommands } from "./commands.js";
 import { escapeHtml } from "./html.js";
 import { INITIAL_RECONNECT_MS, MAX_RECONNECT_MS } from "./reconnect.js";
 import { applyModsToChar, cursorSeq, tildeSeq } from "./keys.js";
@@ -12,6 +14,15 @@ import { splitCommand, toolIconSvg } from "./toolIcon.js";
 import type { ClientControl, Uuid } from "./types.js";
 import { WebglPolicy } from "./webglRenderer.js";
 
+// The pane's half of the command registry (#148): plain Escape hands the
+// keyboard back to the session list, the pair to the list's Tab.
+const paneKeys = new CommandSet(
+  defineCommands({
+    "pane.focusList": () => document.dispatchEvent(new CustomEvent(FOCUS_SIDEBAR_EVENT)),
+  }),
+  { preventDefault: false },
+);
+
 /** One budget for the whole page — see webglRenderer.ts for why contexts are
  *  rationed rather than handed to every connection. */
 const webglPolicy = new WebglPolicy();
@@ -210,6 +221,15 @@ export function createAttachConnection(
     }
   }
 
+  // Plain Escape hands the keyboard back to the session list instead of the
+  // shell/app. `false` tells xterm to skip its own handling of this event —
+  // which is also why the set doesn't `preventDefault`: swallowing here is
+  // xterm's return value, not the browser's.
+  term.attachCustomKeyEventHandler((e) => {
+    if (e.type !== "keydown") return true;
+    return !paneKeys.handle(e);
+  });
+
   // Touch scrolling: xterm's built-in touch handling is jittery (drags crawl a
   // line at a time and stall), so map finger drags ourselves. Two routes:
   //   • normal buffer  → term.scrollLines walks the scrollback.
@@ -450,12 +470,6 @@ export function createAttachConnection(
   const resizeDisp = term.onResize(({ cols, rows }) => {
     sendControl({ type: "Resize", cols, rows });
   });
-  // xterm has no built-in copy-on-select; mirror the selection to the
-  // clipboard ourselves (best-effort — insecure contexts lack the API).
-  const selectionDisp = term.onSelectionChange(() => {
-    const text = term.getSelection();
-    if (text) void navigator.clipboard?.writeText(text).catch(() => {});
-  });
 
   window.addEventListener("resize", onResize);
   const visual = window.visualViewport ?? null;
@@ -511,7 +525,6 @@ export function createAttachConnection(
       visual?.removeEventListener("resize", onResize);
       dataDisp.dispose();
       resizeDisp.dispose();
-      selectionDisp.dispose();
       releaseWebgl();
       try {
         ws.close();

web/src/catalog.ts

@@ -53,6 +53,10 @@ export function requestOpenCommandBar(): void {
  *  connection pool. */
 export const FOCUS_PANE_EVENT = "catalog-focus-pane";
 
+/** Ask the shell to hand the keyboard back to the session list — what Escape
+ *  does when the pane's terminal is focused. Handled in main.ts. */
+export const FOCUS_SIDEBAR_EVENT = "catalog-focus-sidebar";
+
 /** Ask the shell to open the spawn modal seeded from an existing session
  *  ("Spawn similar"). Detail is the session being cloned. */
 export const SPAWN_SIMILAR_EVENT = "catalog-spawn-similar";

web/src/commands.test.ts

@@ -133,28 +133,31 @@ describe("CommandSet", () => {
     expect(run).toHaveBeenCalledTimes(2);
   });
 
-  it("keeps plain keys deaf inside a form field, and leader chords live from the pane", () => {
+  it("keeps plain keys deaf inside a form field, and chorded ones live", () => {
     const plain = vi.fn();
     const chorded = vi.fn();
     const set = new CommandSet(
-      defineCommands({ "spawn.open": plain, "focus.toggle": chorded }, DEFAULT_LEADER),
-      { leader: DEFAULT_LEADER },
+      defineCommands({ "spawn.open": plain, "focus.toggle": chorded }),
     );
     const input = el("<input>");
     expect(pressOn(set, input, "n")).toBe(false);
     expect(plain).not.toHaveBeenCalled();
-    // focus.toggle hangs off the leader (#166): a plain, unmodified Escape is
-    // left for the pane's shell/app instead.
-    const terminal = el('<textarea class="xterm-helper-textarea"></textarea>');
-    pressOn(set, terminal, "a", { ctrlKey: true });
-    expect(pressOn(set, terminal, "h")).toBe(true);
+    expect(pressOn(set, input, "H", { ctrlKey: true, shiftKey: true })).toBe(true);
     expect(chorded).toHaveBeenCalledTimes(1);
   });
 
-  it("leaves a plain Escape for the pane instead of binding it", () => {
-    const set = new CommandSet(defineCommands({ "spawn.open": vi.fn() }));
+  it("keeps pane commands live inside the terminal's textarea", () => {
+    const run = vi.fn();
+    const set = new CommandSet(defineCommands({ "pane.focusList": run }), {
+      preventDefault: false,
+    });
     const textarea = el('<textarea class="xterm-helper-textarea"></textarea>');
-    expect(pressOn(set, textarea, "Escape")).toBe(false);
+    const e = key("Escape");
+    Object.defineProperty(e, "target", { value: textarea });
+    expect(set.handle(e)).toBe(true);
+    expect(run).toHaveBeenCalledTimes(1);
+    // xterm is told to swallow by the return value, not by the browser default.
+    expect(e.defaultPrevented).toBe(false);
   });
 });
 
@@ -170,7 +173,6 @@ describe("the leader", () => {
     const byId = new Map(commandSpecs("ctrl-b").map((s) => [s.id, s]));
     expect(byId.get("pane.literalCtrlK")?.keys).toEqual(["ctrl-b ctrl-k"]);
     expect(byId.get("pane.literalLeader")?.keys).toEqual(["ctrl-b ctrl-b"]);
-    expect(byId.get("focus.toggle")?.keys).toEqual(["ctrl-b h"]);
     // Commands that do not hang off the leader are untouched.
     expect(byId.get("bar.open")?.keys).toEqual(["ctrl-k"]);
   });

web/src/commands.ts

@@ -93,8 +93,7 @@ const SPECS: readonly SpecSource[] = [
     id: "focus.toggle",
     label: "Move the keyboard between the session list and the pane",
     group: "Session list",
-    keys: [`${DEFAULT_LEADER} h`],
-    leaderKeys: (leader) => [`${leader} h`],
+    keys: ["ctrl-shift-h"],
     scope: "global",
   },
   {
@@ -146,6 +145,13 @@ const SPECS: readonly SpecSource[] = [
     keys: ["tab"],
     scope: "list",
   },
+  {
+    id: "pane.focusList",
+    label: "Hand the keyboard back to the session list, from the pane",
+    group: "Session list",
+    keys: ["esc"],
+    scope: "pane",
+  },
   {
     id: "help.toggle",
     label: "Show or hide this help",

web/src/layout.test.ts

@@ -2,7 +2,6 @@ import { describe, expect, it } from "vitest";
 
 import {
   emptyLayout,
-  equalizeRatios,
   leaves,
   locateSession,
   openSessions,
@@ -45,23 +44,6 @@ describe("splitLeaf", () => {
   });
 });
 
-describe("equalizeRatios", () => {
-  it("resets nested splits to equal width, not just the newest one", () => {
-    const tab = tabWithOneLeaf("s1");
-    const first = leaves(tab.root)[0].id;
-    splitLeaf(tab, first, "s2", "row", true); // A|B, 0.5/0.5
-    const second = leaves(tab.root)[1].id;
-    splitLeaf(tab, second, "s3", "row", true); // A(0.5) | (B|C, 0.5/0.5) -> B,C at 0.25 each
-
-    equalizeRatios(tab.root);
-
-    const root = tab.root as Extract<typeof tab.root, { kind: "split" }>;
-    expect(root.ratio).toBeCloseTo(1 / 3);
-    const inner = root.b as Extract<typeof root.b, { kind: "split" }>;
-    expect(inner.ratio).toBeCloseTo(1 / 2);
-  });
-});
-
 describe("removeLeaf", () => {
   it("collapses the parent split into the surviving sibling", () => {
     const tab = tabWithOneLeaf("s1");

web/src/layout.ts

@@ -118,17 +118,6 @@ export function removeLeaf(tab: Tab, leafId: string): void {
   tab.root = tab.root ? rec(tab.root) : null;
 }
 
-/** Reset every split ratio under `node` so all leaves get equal width,
- *  regardless of split direction or nesting order. Returns the leaf count. */
-export function equalizeRatios(node: Node | null): number {
-  if (!node) return 0;
-  if (node.kind === "leaf") return 1;
-  const na = equalizeRatios(node.a);
-  const nb = equalizeRatios(node.b);
-  node.ratio = na / (na + nb);
-  return na + nb;
-}
-
 export function addTab(layout: Layout): Tab {
   const tab: Tab = {
     id: freshId("t"),

web/src/main.ts

@@ -35,6 +35,7 @@ import { loadLayout, saveLayout } from "./persistence.js";
 import { createPreviewSchedule } from "./previewSchedule.js";
 import {
   FOCUS_PANE_EVENT,
+  FOCUS_SIDEBAR_EVENT,
   OPEN_COMMAND_BAR_EVENT,
   OPEN_SPAWN_EVENT,
   SESSION_SELECT_EVENT,
@@ -439,11 +440,10 @@ const spawnKeys = new CommandSet(
   }),
 );
 
-// Leader-h moves the keyboard between the session list and the pane, the web
-// counterpart of the TUI's `ctrl-w h`. It has to be a chord behind the
-// leader: an attached terminal owns every plain keystroke, and Ctrl+Shift+H
-// is already claimed by the browser (history), so nothing unmodified — or
-// modified with a common browser chord — could get the focus back out of it.
+// Ctrl+Shift+H moves the keyboard between the session list and the pane, the
+// web counterpart of the TUI's `ctrl-w h`. It has to be a chord: an attached
+// terminal owns every plain keystroke, so nothing unmodified could ever get
+// the focus back out of it.
 //
 // This set also owns the leader (`[tui].leader`, `ctrl-a` by default, served
 // on `/api/info`): it holds the key as a partial chord and takes select-all off
@@ -528,8 +528,8 @@ window.addEventListener(
 );
 
 
-// Tab in the session list hands the keyboard to the pane; leader-h (focus.toggle,
-// above) hands it back the other way.
+// Tab in the session list hands the keyboard to the pane; Escape in the pane
+// hands it back — the pair the TUI gets from `tab` and `esc`.
 document.addEventListener(FOCUS_PANE_EVENT, () => {
   // Handing the keyboard to a previewed pane is choosing it: the preview stops
   // being provisional rather than snapping back the moment the list blurs.
@@ -537,6 +537,10 @@ document.addEventListener(FOCUS_PANE_EVENT, () => {
   if (previewed) focusSession(previewed);
   pool.focusTerminal();
 });
+document.addEventListener(FOCUS_SIDEBAR_EVENT, () => {
+  drawer.open(); // no-op on desktop; on mobile the list is off-canvas
+  sidebar.focusList();
+});
 
 /** Open/focus a session and reflect it in the shell chrome. Shared by the
  *  hash router and the sidebar's click-driven path (#133), which can't rely

web/src/multiview.ts

@@ -10,7 +10,6 @@ import {
   activeTab,
   addTab,
   closeTab,
-  equalizeRatios,
   findLeaf,
   freshId,
   type Dir,
@@ -458,7 +457,6 @@ export function createMultiView(opts: MultiViewOptions): MultiView {
     dropPreview();
     const tab = activeTab(layout);
     tab.focusedLeafId = splitLeaf(tab, leafId, null, dir, true);
-    equalizeRatios(tab.root);
     render();
   }
 
@@ -544,7 +542,6 @@ export function createMultiView(opts: MultiViewOptions): MultiView {
       target.sessionId = sessionId;
     } else {
       tab.focusedLeafId = splitLeaf(tab, target.id, sessionId, "row", true);
-      equalizeRatios(tab.root);
     }
     render();
     opts.onOpenSessionsChange?.();
@@ -818,7 +815,6 @@ export function createMultiView(opts: MultiViewOptions): MultiView {
     if (source.kind === "pane" && self) removeLeaf(tab, self);
     else if (loc) removeLeaf(loc.tab, loc.leaf.id);
     tab.focusedLeafId = splitLeaf(tab, targetLeafId, sessionId, dir, after);
-    equalizeRatios(tab.root);
     render();
   }
 

web/src/types.ts

@@ -56,10 +56,6 @@ export interface Session {
    * how the command bar's empty query sorts a never-focused session after every
    * session that has one (`docs/COMMAND-BAR.md`). */
   last_focused_at?: IsoTimestamp | null;
-  /** The ACP session id the `claude-code-acp` adapter returned from
-   * `session/new` (#134). Only a `Structured` session whose handshake
-   * succeeded has one; a respawn passes it to `session/load` (#135). */
-  acp_session_id?: string | null;
 }
 
 /** A session's daemon-created worktree (`SessionWorktree` on the wire). */