[teamleaderleo]

Leo, on the NEXT nightly's Session Info Subagents section (2026-11-02): "but what's going on with these?"

It showed "15 running · 27 done", then "Running 0 / 1000 max", then rows named by a raw session id ("01a18fcd-c1c7-7c…") that each read "1h 55m … Running".

Causes and fixes

1. Two counts, two sources. The head counts the chat's own subagents (Agent tool calls). The "Running X / Y max" line counts only the chats the agent started with start_session (acpmux subsessionLimits), and caps those, not Agent subagents. With no started chats it read 0 while 15 subagents ran.
   • The line now reads "Started chats: 0 of 1000 at once", so it says what it counts and what the limit caps. − / + still set the cap. The 1000 is acpmux's top of range (MAX_RUNNING.max), and the settings set the cap there.
   • The head and every line now read one status from one clock (subagentStatus(agent, waiting, now)), so a line and the head can no longer disagree.
2. Rows named by raw ids. acpmux put a subagent's name/task only on its subagent_spawned event. A pane that read the chat's log from a page after the spawn met the subagent first through subagent_progress and named it by its id.
   • acpmux (subagents.rs) now remembers each subagent's name and puts it on every later progress and state event. A later name, such as a workflow's launch, replaces it.
   • The pane falls back to the first line of the subagent's prompt, and uses the id only when nothing else names it.
3. "Running" for two hours. A subagent that ended its turn but waits on background work of its own (Claude's run_in_background) stays running in acpmux.
   • The fold now tracks quietSince: the last line, call or new token count while none of the subagent's calls is open.
   • After 3 minutes quiet with no call open (IDLE_AFTER_MS), the subagent reads Idle: in its line, in the head ("3 running · 2 idle · 1 done") and out of the running shimmer.
   • A subagent with an open call (a long build) stays Running.

Gallery

agent-pane.session-info/subagents-idle (SessionInfo.gallery.tsx) renders this state.

Tests

• test/subagent-idle-and-name.test.ts (new): naming from a prompt when a subagent is met through progress; idle vs open call vs repeated progress.
• test/native-session-info-activity.test.ts: the head reads "2 running · 1 idle · 1 done", the idle row's tone and wave, and the limit line's words.
• test/subagent-limit-stepper.test.tsx: the new limit wording.
• acpmux subagents.rs: a_progress_update_carries_the_name_its_spawn_gave.

Design spec: design/session-info.md (Subagents section).

Risk: low. The change touches display state only and changes no lifecycle; acpmux only adds a name field to events.

🤖 Generated with Claude Code

Agent session: agent session

[github-actions]

cmux status _{(one comment, edited in place; each line is updated by the job that owns it)}

Review 8347eba: HQ feed card · gallery before/after runs · checks

App of this head (app.zip, kept 1 day)

gh workflow run reload-build.yml -R manaflow-ai/cmux --ref feat-cmux-next -f tag=pr33194 -f ref=fix/session-info-subagents -f platform=macos -f backend_mode=local

Gallery before/after for 8347eba: 16 states rendered, 14 images differ, 3155 more touched states not rendered. Images are in the run's artifact, not on this public PR; the independent review of this head reads them on its own, so the PR needs no hand-made screenshots of these states.

gh run download 41599448199 -R manaflow-ai/cmux -n gallery-advisory-33194-8347ebaa94ea16bbcf4b6ae21bee79c331b6aadf (then read gallery-review.json)

States

State	Theme	Status	Diff	Picked by
agent-pane.chat-inspector/subagents-idle	Apple System Colors Light	new	0%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/subagents-idle	Apple System Colors	new	0%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/full	Apple System Colors Light	changed	0.22%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/full	Apple System Colors	changed	0.216%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/compact-more	Apple System Colors	changed	0.443%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/compact-more	Apple System Colors Light	changed	0.417%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/compact-more-open	Apple System Colors Light	changed	0.285%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/compact-more-open	Apple System Colors	changed	0.257%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/compact-folded	Apple System Colors Light	changed	0.292%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/compact-folded	Apple System Colors	changed	0.216%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/compact-capped	Apple System Colors	changed	0.263%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/compact-capped	Apple System Colors Light	changed	0.22%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/workflow-running	Apple System Colors Light	changed	0.0068%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/workflow-running	Apple System Colors	changed	0.006%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/workflow-finished	Apple System Colors Light	unchanged	0%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector/workflow-finished	Apple System Colors	unchanged	0%	own SessionInfo.gallery.tsx
agent-pane.chat-inspector-surfaces/transcript	Apple System Colors Light	unchanged	0%	own SessionInfo.tsx
agent-pane.chat-inspector-surfaces/transcript	Apple System Colors	unchanged	0%	own SessionInfo.tsx
agent-pane.chat-inspector-surfaces/diff-in-place	Apple System Colors Light	unchanged	0%	own SessionInfo.tsx
agent-pane.chat-inspector-surfaces/diff-in-place	Apple System Colors	unchanged	0%	own SessionInfo.tsx
agent-pane.chat-inspector-surfaces/document-beside	Apple System Colors Light	unchanged	0%	own SessionInfo.tsx
agent-pane.chat-inspector-surfaces/document-beside	Apple System Colors	unchanged	0%	own SessionInfo.tsx
agent-pane.chat-inspector-surfaces/diff-closed	Apple System Colors Light	unchanged	0%	own SessionInfo.tsx
agent-pane.chat-inspector-surfaces/diff-closed	Apple System Colors	unchanged	0%	own SessionInfo.tsx
agent-pane.inspector-composer-foot/animated	Apple System Colors Light	unchanged	0%	own SessionInfo.tsx
agent-pane.inspector-composer-foot/animated	Apple System Colors	unchanged	0%	own SessionInfo.tsx
agent-pane.inspector-composer-foot/jump	Apple System Colors Light	unchanged	0%	own SessionInfo.tsx
agent-pane.inspector-composer-foot/jump	Apple System Colors	unchanged	0%	own SessionInfo.tsx
agent-pane.inspector-composer-foot/steady	Apple System Colors Light	unchanged	0%	own SessionInfo.tsx
agent-pane.inspector-composer-foot/steady	Apple System Colors	unchanged	0%	own SessionInfo.tsx
agent-pane.inspector-composer-foot/popover	Apple System Colors Light	unchanged	0%	own SessionInfo.tsx
agent-pane.inspector-composer-foot/popover	Apple System Colors	unchanged	0%	own SessionInfo.tsx

_{Pick other states with a Gallery: entry.id, entry.id/variant line in the PR body.}

web and size checks: green

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.4160373381601 (d485585f77)
• cmux NEXT nightly 1.0.0-nightly.4160614853601 (0e8eb9bf99)

[teamleaderleo]

Owned by an agent session · session

[blacksmith-sh]

Found 1 test failure on Blacksmith runners:

Failure

Test	View Logs
test_event_stream_drift_is_rejected (main.InventoryContractTests.test_event_stream_ drift_is_rejected)/ test_event_stream_drift_is_rejected (main.InventoryContractTests.test_event_stream_ drift_is_rejected)	View Logs

^{Need help on this PR? Tag @codesmith-bot with what you need.}

[teamleaderleo]

Review (codex gpt-6.1-sol xhigh, router-review): BLOCK at 11998ef

BLOCK at 11998ef

Visual verdict: no images; Leo tries the build

1. [P1] [blocking] subagents.rs:245: Mask names before truncating the cached copy. A name containing a GitHub token across the 60-character boundary is initially masked correctly. After completion and a nameless resume, the cached fragment reaches subagentNames; the incomplete token no longer matches the scanner. Base exposes no name on that resume. Add a lifecycle regression test.

2. [P2] [follow-up] subagentFold.ts:1182: Publish quietSince changes through the UI cache. AgentProgressStore omits it from structureVersion, so App retains old agent snapshots. Reproduced: text activity leaves an active agent appearing Idle; call completion leaves a quiet agent appearing Running indefinitely.

3. [P2] [follow-up] subagentFold.ts:373: Track open calls before the agent’s identity arrives. The earlier unknown-owner branch returns before this bookkeeping. Reproduced: a paged log containing an open build followed by the agent’s first progress labels it Idle after three minutes while the build remains open.

4. [P2] [follow-up] subagents.rs:249: Cache the task when no name exists. Codex legacy spawns supply task, but this branch discards it, leaving later nameless events—and clients starting after spawn—with raw IDs.

Follow-ups:

• Disambiguate Sentry environment between production and dev #2: Refresh cached idle timestamps.
• Release v1.13.0 #3: Preserve open calls seen before identity.
• Release v1.14.0 #4: Retain task-only names.
• [P2] [follow-up] SessionInfo.gallery.tsx:1329: Supply the missing after screenshots.

[teamleaderleo]

Review (codex, router-review): SHIP at ab59434

Reviewer: codex gpt-6-astra high, fast tier.

Follow-ups: 2. Each lands as an issue in this repo that links this receipt; the lane that opened the PR fixes it forward.

SHIP at ab59434
Visual verdict: no images; Leo tries the build

1. [P2] [follow-up] webviews/src/agent-session/acpmux/subagents/subagentFold.ts:375: A ToolSearch opened before the subagent’s identity arrives enters openCalls, but its completion is excluded by tool because it is hidden. Reproduced: quietSince remains undefined after completion, preventing Idle indefinitely. Track call completion independently of visibility and add this paged-history case to the tests.
2. [P2] [follow-up] webviews/src/agent-session/acpmux/session-info/SessionInfo.gallery.tsx:1329: After screenshots are unavailable; verify the idle gallery state in the build.

Changed TypeScript files parse successfully. Full tests were unavailable because Bun and dependencies are absent.

Follow-ups:

• Track hidden-call completion consistently.
• Verify the idle gallery visually.

[cmux-bot]

cmux-bot approves ab59434: an independent review passed this exact head (router-review receipt by teamleaderleo). A push needs a new review; a later BLOCK at this head dismisses this approval.