Drive the trusty-mpm session manager (binary `tm`) to spawn, observe, command, and decommission durable tmux-backed Claude Code sessions in isolated workspaces. Wraps the `tm session` CLI / REST API and provides the spawn → observe → answer → stop/resume/decommission loop. Critically, the DRIVER interprets the raw tmux pane using its own inference — it does NOT depend on the daemon's optional LLM (no OpenRouter key required).
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Drive the trusty-mpm session manager (binary `tm`) to spawn, observe, command, and decommission durable tmux-backed Claude Code sessions in isolated workspaces. Wraps the `tm session` CLI / REST API and provides the spawn → observe → answer → stop/resume/decommission loop. Critically, the DRIVER interprets the raw tmux pane using its own inference — it does NOT depend on the daemon's optional LLM (no OpenRouter key required).
version
1.0.0
category
infrastructure
when_to_use
when spawning, observing, commanding, answering decisions for, stopping, resuming, or decommissioning trusty-mpm session-manager sessions; when driving a fleet of durable Claude Code harness sessions; when a task requires delegating work to an isolated, observable, long-running coding session
{"level":1,"references":[],"note":"Single-file procedural skill. The driver loop and autonomy policy are the deliverable; no deeper reference files needed."}
Session Manager Driver
Procedural how-to for driving the trusty-mpm session manager — a Rust daemon
(binary tm) that spawns, observes, and controls durable, tmux-backed Claude Code
sessions, each in its own isolated git workspace. This skill wraps the
tm session CLI verbs and the underlying REST API, and defines the
spawn → observe → answer → stop/resume/decommission control loop plus the
T1–T4 autonomy policy that governs how much the driver may do without a human.
Core design principle: YOU do the reasoning
The session manager exposes raw observability, not conclusions. When driven by
claude-mpm, inference is provided by claude-mpm's own Claude — there is no
OpenRouter key and none is needed.
The daemon ALWAYS returns raw_pane (the last ~60 lines of the tmux pane).
It returns a best-effort structured state, summary, pending_decision,
and proposed_default — but when no OpenRouter key is configured these may be
state: "unknown" / summary thin / confidence: 0.0. This is expected and
fine.
The driver reads raw_pane and decides. Never block on the daemon's
optional LLM classification. Treat state as a hint; treat raw_pane as ground
truth.
Prerequisites
The tm binary on PATH (trusty-mpm session manager).
The session-manager daemon running. Default base URL: http://localhost:7424.
A health check before driving anything (see Health & Status below).
Command reference (tm session verbs)
Prefer the CLI over raw HTTP. Each verb maps to a REST endpoint on the daemon.
Operation
CLI command
HTTP endpoint
spawn
tm session new <repo> --git-ref <ref> --task "<desc>" [--name-hint <h>]
POST /api/v1/sessions/managed
list
tm session ls [--json]
GET /api/v1/sessions/managed
activity (poll)
tm session activity <id>
GET /api/v1/sessions/managed/{id}/activity
send text
tm session send <id> "<text>"
POST /api/v1/sessions/managed/{id}/send
answer decision
tm session answer <id> "<answer>"
POST /api/v1/sessions/managed/{id}/answer
attach (human)
tm session attach <id>
GET /api/v1/sessions/managed/{id}/attach-cmd
stop (keep workspace)
tm session stop <id>
POST /api/v1/sessions/managed/{id}/runtime-stop
resume
tm session resume <id>
POST /api/v1/sessions/managed/{id}/resume
decommission (delete workspace)
tm session decommission <id>
POST /api/v1/sessions/managed/{id}/decommission
Health & status
Before spawning or driving, confirm the daemon is reachable and healthy:
If /health reports a degraded or unreachable daemon, do not spawn — escalate
to the human (T4-equivalent: infrastructure problem).
The activity response (the object you interpret)
tm session activity <id> returns:
{"raw_pane":"<last ~60 lines of the tmux pane; ALWAYS present>","runtime_active":true,"state":"working|idle|blocked_on_permission|errored|done|unknown","summary":"<best-available text>","confidence":0.0,"pending_decision":"<question the session is waiting on, or null>","proposed_default":"<a suggested answer, or null>"}
How to read it:
raw_pane — your primary signal. Read it like a human reading the terminal.
Look for prompts (? Do you want to…, (y/N), Press enter to continue),
errors (panics, tracebacks, error[), completion markers, and the trailing
cursor line.
pending_decision non-null — the session is blocked waiting for an answer.
Decide per the autonomy policy below, then tm session answer <id> "<answer>".
runtime_active: false — the tmux runtime is stopped (the session may be
stopped lifecycle state but resumable). Use tm session resume <id> to restart
the runtime before sending.
state: "unknown" / confidence: 0.0 — the daemon's optional LLM did not
classify (no OpenRouter key). Ignore the absence and classify from raw_pane
yourself.
Lifecycle states
provisioning ──▶ active ⇄ stopped ──▶ decommissioned (terminal)
provisioning — workspace being prepared; not yet driveable. Poll until active.
active — runtime live; observe/send/answer freely (within tier).
stopped — runtime halted but workspace preserved; resumable with
tm session resume. tm session stop puts a session here.
decommissioned — workspace deleted; terminal and irreversible. Only
tm session decommission reaches this state.
stop keeps the workspace (cheap, resumable). decommission DELETES it
(destructive, irreversible). Never conflate the two.
The driver loop
1. spawn → tm session new <repo> --git-ref <ref> --task "<desc>" --name-hint <h>
capture the returned session id.
2. wait active → poll `tm session activity <id>` until runtime_active && not provisioning.
BOUND THIS WAIT: if the session is still provisioning / not active
after ~5 min (≈20 polls at 15 s), STOP polling and escalate to the
human (likely a provisioning/infra fault) — never wait indefinitely.
3. observe → read raw_pane. Classify: working / idle / blocked / errored / done.
4. branch:
- working → wait, then poll again (backoff; see cadence below).
- blocked → pending_decision != null → decide (autonomy policy) → answer or escalate.
- idle/needs nudge → tm session send <id> "<next instruction>" (T3).
- errored → capture raw_pane, escalate to human (do not auto-retry destructive steps).
- done → record result, then tm session stop <id> (preserve workspace).
5. teardown → stop (keep) for later resume, OR decommission (delete) ONLY with
explicit human confirmation (T4).
Polling cadence
Poll activity on a backoff to avoid hammering the daemon:
Just after spawn / after sending input: poll every 3–5 s for the first
~30 s (state changes fast right after input).
Steady "working" state: back off to every 15–30 s.
Always re-poll immediately after send or answer to confirm the session
consumed it.
Hard timeout (mandatory). Cap every wait loop at a stated bound — e.g.
~5 minutes / 20 iterations for the "wait until active" phase, and a similarly
finite bound for any "working with no progress" wait. When the bound is reached
STOP polling and escalate to the human with the last raw_pane; never poll
indefinitely.
Use a bounded poll loop, never an unbounded busy-wait. The loop below also
escalates if the session never reaches an actionable state within the bound:
SID="$1"
MAX_ITERS=20 # ~5 min at 15 s/iter — the hard escalation boundfor i in $(seq 1 "$MAX_ITERS"); do
ACT="$(tm session activity "$SID")"
PENDING="$(printf '%s' "$ACT" | jq -r '.pending_decision // empty')"
ACTIVE="$(printf '%s' "$ACT" | jq -r '.runtime_active')"# Print raw_pane for the driver (Claude) to read and reason over.printf'%s'"$ACT" | jq -r '.raw_pane'
[ -n "$PENDING" ] && { echo"PENDING_DECISION: $PENDING"; break; }
[ "$ACTIVE" = "false" ] && { echo"RUNTIME_INACTIVE"; break; }
if [ "$i" -eq "$MAX_ITERS" ]; thenecho"ESCALATE: session $SID not actionable after $MAX_ITERS polls; stopping wait — hand to human"breakfisleep 15
done
The script surfaces raw_pane + the pending question; the reasoning step
(what the answer should be) is performed by you, the driver, not by the script
and not by the daemon.
Detecting and answering a pending decision
A session is "blocked on a decision" when either:
pending_decision is non-null in the activity response, or
raw_pane shows an interactive prompt the structured state missed
(e.g. a (y/N) confirmation, a numbered menu, a Proceed? [Y/n]).
To answer:
tm session answer <id> "<your answer>"# Then immediately re-poll activity to confirm the session advanced.
Decide WHAT to answer using the autonomy policy. If the policy says auto-answer
is allowed, prefer proposed_default when it is present and consistent with your
reading of raw_pane; otherwise compose the answer yourself from raw_pane.
If tm session answer does not unblock the prompt (some TUIs need a literal
keystroke), fall back to tm session send <id> "<keystroke>" (e.g. "y",
"1", or an empty line to accept a default).
Autonomy tiers (T1–T4)
The driver operates at an explicitly chosen tier. Default to the most
conservative tier appropriate for the task; never silently escalate your own
tier. Tiers are cumulative (T3 includes T1–T2 capabilities).
Tier
Name
The driver MAY…
Examples
T1
Read-only observe
spawn? no. Only ls, activity, attach-cmd, /health. Never mutate session state.
Monitor a fleet, report status, surface pending decisions for a human to answer.
T2
Auto-answer safe defaults
everything in T1, plus answer low-risk pending decisions using proposed_default when it is present and matches your reading of raw_pane.
everything in T2, plusspawn sessions, send routine non-destructive instructions, stop (workspace preserved), resume. Compose answers (not just accept defaults) for non-destructive decisions.
Spawn a session for a scoped task, nudge it through a build, answer "which test runner?", stop it when done.
T4
Destructive / irreversible
everything in T3, but ONLY with explicit, logged human confirmation for: decommission (deletes workspace), answering decisions that delete data / force-push / publish / spend money / touch production, or running anything outside the session's assigned task scope.
Decommission a session, approve a git push --force, approve a cargo publish, approve rm -rf.
Auto-answer vs. escalate decision rule
Classify the risk of a pending decision from raw_pane + pending_decision:
Low-risk (auto-answer at T2+): idempotent, reversible, scoped to the
workspace — create file/dir, install a dependency, run tests, format, choose a
conventional default. Prefer proposed_default when present.
Medium-risk (auto-answer only at T3, otherwise escalate): non-destructive
but consequential — choosing an architecture, committing, opening a PR, picking a
dependency version. Compose a reasoned answer; if uncertain, escalate.
High-risk (ALWAYS escalate; never auto-answer regardless of tier): deletes
data, --force, publishes/releases, spends money, modifies production, leaves
the assigned task scope, or decommission. Surface the exact raw_pane excerpt
and the proposed action; wait for explicit human "yes."
When in doubt, escalate. A blocked session is recoverable; a wrong destructive
answer may not be.
Stop / resume / decommission semantics
tm session stop <id> — halts the runtime, keeps the workspace. Cheap,
reversible. Use when a task is done but you might resume, or to free runtime
resources. (T3.)
tm session resume <id> — restarts the runtime of a stopped session in its
preserved workspace. Re-poll activity after resuming; the pane resumes where it
left off. (T3.)
tm session decommission <id> — deletes the workspace; terminal. Use
only after the work is captured (committed/PR'd) and only with explicit human
confirmation. (T4.)
Escalation protocol
Escalate to the human (return control, surface context) when:
a decision is high-risk (per the rule above),
the session is errored and recovery is non-obvious,
/health reports the daemon degraded/unreachable,
a session has been "working" past a reasonable bound with no progress in
raw_pane (possible hang — offer attach, stop, or escalate),
the current tier does not permit the needed action.
When escalating, include: the session id, the relevant raw_pane excerpt, the
pending_decision (if any), and the action you recommend.
Full-cycle smoke test
End-to-end exercise of every verb (mirrors issue #842 acceptance criteria):
# 0. health
curl -sf http://localhost:7424/health
# 1. spawn# `tm session new` prints a human-readable line: "spawned <name> (<id>) [<state>]".# It has NO --json flag, so extract the id from the parenthesised field.
SID="$(tm session new https://github.com/org/repo --git-ref main \
--task "run the test suite and report failures" \
--name-hint smoke | sed -n 's/^spawned [^(]*(\([^)]*\)).*/\1/p')"# Fallback if the spawn line format changes: `ls` DOES support --json — take the# newest session id: SID="$(tm session ls --json | jq -r '.sessions[-1].id')"# 2. observe until active, reading raw_pane
tm session activity "$SID"# 3. drive: answer a decision (T2) or send an instruction (T3)
tm session answer "$SID""y"# if pending_decision present
tm session send "$SID""cargo test"# routine instruction# 4. stop (keep workspace) — reversible
tm session stop "$SID"# 5. resume — back to active in the same workspace
tm session resume "$SID"# 6. decommission (delete workspace) — T4, requires human confirmation
tm session decommission "$SID"
Anti-patterns (do NOT do these)
❌ Waiting on / trusting state over raw_pane. The pane is ground truth;
state: "unknown" is expected without an OpenRouter key.
❌ Treating stop and decommission as interchangeable. decommission
deletes the workspace.
❌ Auto-answering a high-risk decision because proposed_default was present.
proposed_default is a hint, not authorization.
❌ Unbounded busy-wait polling. Always bound the loop and back off.
❌ Decommissioning before the work is captured (committed / PR'd).
❌ Silently escalating your own autonomy tier.
Related skills
mpm-bug-reporting — file a GitHub issue when the session manager itself misbehaves.
mpm-verification-protocols — verification gates before declaring a driven task complete.
