maestro/docs/SIDEBAR.md

SIDEBAR.md — the session card contract

One rule for how a session is rendered as a card in the sidebar, so the web sidebar (#107) and the TUI sidebar (#108) describe a session the same way. Read this before changing either. Both clients implement exactly what is written here; if it needs to change, change it here first.

A card has line 1 always and line 2 only when line 2 has something to say.

Line 1 — name + actions

• Left: the session name — metadata.name if present, else the command line (same fallback both clients already use).
• Right: two actions anchored to the top-right corner: spawn similar (⧉) and kill (✕). In the TUI these are keyboard affordances shown on the highlighted row; in the web they are buttons. The glyphs are shared so muscle memory transfers.
• Actions reserve their fixed width; the name truncates with … before it can ever reach them. Overlap between the name and the actions is a defect — that overlap is what started this milestone.

Line 1 carries no badges. The ⚠ blocked work badge (#83) and the exited badge move off this row into line 2.

Line 2 — meta line (adaptive)

Rendered only when at least one of these holds:

1. The session has been held in its current activity state longer than 30 seconds (activity_since from #102). A freshly-active session stays one line.
2. Its worktree holds blocked work: blocked_work is Some and not clear (InTheWay::is_clear()), rendered in formatInTheWay's phrasing on web and as ⚠ <summary> on the TUI.
3. It has exited: status == Dead.
4. An agent-reported state (#105) of Error is in force (see Precedence).

Otherwise line 2 is absent — never an empty placeholder row.

When present, line 2 reads left to right:

<dot> <duration> [<detail>] [<blocked work> | exited] [<command>]

<dot> is a single filled glyph (● on both clients) carrying the activity state's colour, and <duration> follows in the same colour. There is no state word and no second badge: the dot exists so the state is still legible when a row is dimmed or the terminal renders the duration in the default fg. The dot and duration are unconditional parts of line 2; the bracketed fragments appear only when their trigger holds. A payload that predates #102 (no usable activity_since) contributes no duration — the dot still renders.

<detail> is an agent-reported string (#105) — e.g. why a session is in Error. It sits right after the duration, in the muted style, and shows only while an agent-reported state is in force (see Precedence): when the report lapses at its TTL or is replaced, the detail goes with it. The detail truncates with … ahead of the trailing fragments — a long detail never pushes <blocked work>, exited, or <command> off the line, and neither client ever lets it wrap.

<command> is optional and muted: the session's command line, shown only when the rendered name came from metadata.name and differs from the command (the web has always surfaced this; the TUI may omit it).

Colour per activity state

The state word is never spelled out — the colour carries it.

Activity state	Web token	TUI palette role
Active	--live	active
Idle	--muted	idle
AwaitingInput	--warn	awaiting
Error	--danger	error

Web tokens resolve per theme automatically (styles.css defines dark, light, and prefers-color-scheme variants for each). The TUI names roles, not colours: a role's value comes from the active palette (maestro-tui/src/palette.rs), never from a colour spelled out at the use site.

A palette holds one role set per surface — the card surface every card sits on, and the selection surface the highlighted card swaps in — so each state role resolves to the value picked for the surface it is painted on. The highlighted card therefore takes its state colours from the selection surface; a colour chosen for the card background is never painted onto the selection background. Contrast is a property of the palette (values are RGB) and is asserted in the palette's tests, not left to the terminal theme.

The duration text inherits its state's colour; the blocked-work, exited and command fragments use the surface's muted role, since the ⚠ glyph already signals severity.

Duration format

Time spent in the current activity state, sourced from activity_since (#102) — not time since spawn, and not time since last PTY output (last_activity_at). Both clients compute it identically:

• < 60s → whole seconds, floored: 30s
• < 60m → whole minutes, floored: 4m
• ≥ 60m → whole hours, floored: 2h

No days unit, no seconds inside minutes, no rounding up. Floor everywhere so the counter never shows a duration the state hasn't actually reached yet. Clock granularity: re-render at least once every 30s while visible so the cutover points land within one tick.

Precedence

An agent-reported ActivityState (#105) overrides the daemon's inference for five minutes (the TTL is fixed by the daemon; re-reporting extends it). When the TTL expires, inference resumes and the session's reported detail — if any — clears with the report. Clients never blend the two: whichever source is in force supplies both the colour and the clock for activity_since.

Two rulings specific to a reported Error (#114):

• The five-minute TTL applies to Error like to any other state. A session that failed is still failed after five minutes, but a card pinned red forever lies once the session moves on; when the report lapses the card returns to the daemon's own inference — usually Idle for a session that has gone quiet.
• Only a new report clears an Error before its TTL. The next ActivityState of any kind replaces it (with #106's hook that is typically PreToolUse → Active when the user prompts again). PTY output and process changes do not clear it — only the agent itself may withdraw what the agent itself reported. Re-reporting Error extends the TTL rather than stacking reports.

If a client receives an ActivityState variant it does not know, it must not fail rendering: treat it as Idle (neutral/dim, line-2 rules apply as usual) until the daemon sends a variant it does know. Rust clients deserialize activity leniently for the same reason.

Leniency runs one way only. It covers a client reading a newer daemon, where dropping the whole session would be worse than dimming one card. A report arriving at POST /api/sessions/:id/activity is parsed strictly and an unknown state is a 4xx: an agent posting a state the daemon does not know is a bug in the agent, and answering 204 would hide it.