# Task completion safety net: every live task is stuck "Running"

Status: Done — 2026-07-12. Fixes 1-3 implemented, built, tested
(`go build ./...`, `go test ./cmd/nomos/...`), committed (`3b9c75f`),
deployed, and verified live (see Verification below — fresh trivial Q&A
sessions now reach `done` immediately; a goal-bearing session that went
idle was correctly nudged and auto-resolved by the existing resume-failure
path). Fix 4 (backfill) was replaced with deletion — see "Fix 4, revised"
below; the original backfill-with-a-fabricated-outcome approach was never
run.

## Scope

Fix the root cause of a production-wide defect found while UI-testing
[`2026-07-11-ui-review-ia-usability.md`](2026-07-11-ui-review-ia-usability.md):
every session on the live task board shows as "Running" forever. Traced
through `cmd/nomos/` and confirmed against the running database — this is
not a frontend bug (the board correctly reflects real `agent_sessions.status`
values). It's an agent-behavior gap: the model almost never calls the
lifecycle tools (`set_goal` / `propose_plan` / `complete_task`) that the
task-board feature (shipped today,
[`done/2026-07-11-goal-oriented-chat-control-panel.md`](2026-07-11-goal-oriented-chat-control-panel.md))
depends on to know a task is finished.

## Evidence

Queried the live nomos API directly (`curl localhost:8092/sessions` and
per-session transcripts) against the running mac-mini stack:

- **50/50 live sessions**: 49 `active`, 1 `planning`. Zero have ever reached
  `executing`, `awaiting_input`, `done`, or `failed`.
- Across all 50 sessions: **`set_goal` called once. `propose_plan` called
  zero times. `complete_task` called zero times.**
- The dominant pattern (43/50 sessions, 2-message transcripts) is a single
  quick exchange: operator asks something narrow ("what's the hostname of
  lxc:caddy?"), the model runs one read tool (`run hostname`), answers in
  plain text, and the turn ends — no lifecycle tool call at all. This is
  exactly the case
  [`nomos/SOUL.md:105-109`](../../nomos/SOUL.md#L105) calls out by name
  ("a trivial read-only task... is a degenerate case... answer it and
  `complete_task` with a one-line summary") — the instruction exists and is
  explicit, and the model skips it anyway, consistently.
- The one session that *did* call `set_goal` (a fleet health check) did
  substantial real research (`get_health_summary`, `get_state_snapshot`,
  `get_signal_history`, `list_lxcs`), gave the operator a full structured
  answer, and then also just stopped — no `propose_plan`, no
  `complete_task`. Status: stuck at `planning` since 2026-07-11T11:35, still
  showing "Running" on the board.

This means the board's "N Running / 0 Done / 0 Failed" isn't a fluke or an
edge case — it's the default outcome for essentially every task the system
has ever run. The feature as designed (terminal state is 100% dependent on
the model remembering to call one specific tool) doesn't hold up against
real model behavior, even with an explicit prompt instruction already in
place.

## Where this lives in the code

`cmd/nomos/agent.go`'s `chatWith` has exactly one place a turn ends with a
plain-text answer and no tool calls:

```go
// agent.go:359-368
if len(msg.ToolCalls) == 0 {
    emit(agentEvent{Type: "text", Data: msg.Content, SessionID: sessionID})
    emit(agentEvent{Type: "done", ...})
    return
}
```

This is reached for the trivial-Q&A case (a turn that made zero or a few
read-only tool calls this iteration, then answered in text) and is where
43/50 of the stuck sessions are produced. There's a second, rarer exit at
the step-limit fallback (`agent.go:487-494`, `finalSummary`) with the same
gap.

Neither exit currently checks whether the session ever reached a terminal
state — the turn just ends, and `agent_sessions.status` is left wherever it
was (usually `active`, its creation-time default,
[`store.go:71,84`](../../cmd/nomos/store.go#L71)).

## Design

Two different failure shapes need two different fixes — collapsing them
into one heuristic would either auto-close genuinely in-progress structured
tasks or fail to catch the trivial-Q&A majority.

**1. Trivial/no-lifecycle-tool sessions (the 43/50 case) — auto-complete
   inline, same turn.**
If a turn ends with a plain-text response (`len(msg.ToolCalls) == 0`, the
existing exit at `agent.go:359`) AND this session has never called
`set_goal` in its history, that's strong evidence this was never meant to
be a structured multi-step task — it's a one-shot question that got
answered. Call `store.completeTask` server-side right there, before the
`return`, with `outcome="success"` and a summary derived from the response
text (first ~120 chars, same truncation pattern
`buildContinuationNote` already uses at
[`continue.go:203-205`](../../cmd/nomos/continue.go#L203)). No LLM call needed
— this is a mechanical default, not a judgment call, matching the "trivial
task" case SOUL.md already describes.

If the session *has* called `set_goal` (meaning the model explicitly framed
this as a task, e.g. the fleet-health-check session), auto-completing on
the very next plain-text turn is riskier — the model may reasonably expect
to be asked something next. Skip the inline auto-complete for these; case 2
covers them.

**2. Structured (goal/plan set) sessions that stall — idle sweep, not
   inline.**
Extend the existing `runContinuationWorker` ticker
([`continue.go:41-57`](../../cmd/nomos/continue.go#L41), already polling every
4s for a different purpose) with a second, coarser sweep — e.g. every 5
minutes — that finds sessions where:
- `status` is `active`, `planning`, or `executing` (not already terminal or
  `awaiting_input`, which has its own resolution path), AND
- `set_goal` was called (this is a real task, not case 1), AND
- `last_active_at` is older than some idle threshold (start with 15
  minutes — long enough that it's not still mid-turn, short enough that the
  board doesn't lie for hours).

First idle hit: inject a system note next time nothing else touches the
session ("[System: this task has been idle for N minutes with no
`complete_task` call. If the goal is done, call it now with a summary. If
you're genuinely still working, ignore this.]") the same way
`buildContinuationNote` already injects notes into resumed sessions — reuse
`resumeSession`'s live-persist pattern
([`continue.go:106-196`](../../cmd/nomos/continue.go#L106)) so the nudge and
the model's response show up in the transcript, not silently.

If a second idle sweep finds the same session still not completed (i.e.
the nudge didn't take), auto-complete it directly with
`outcome="partial"` and a summary noting it was auto-closed after an
unanswered nudge — same reasoning as `resumeSession`'s existing
"give the task a real, operator-visible terminal state instead of leaving
it silently stuck forever" logic at
[`continue.go:179-193`](../../cmd/nomos/continue.go#L179), which already does
exactly this for a different failure mode (a resume that produces no
response). This is the same architectural pattern, applied to a session
that produces responses but never a terminal tool call.

**3. Leave `ask_operator` and gated-execution flows alone.** Those already
have real terminal signals (`awaiting_input` status, the continuation
worker's assent-window logic) — this plan only targets sessions that fall
through with no lifecycle signal at all.

## Fix plan

1. **Inline safety net (case 1)** — in `chatWith`'s plain-text exit
   (`agent.go:359`), check `set_goal` was never called for this session
   (cheap: track a bool while replaying `history` in the same function, no
   extra query — the loop at `agent.go:209-226` already walks every
   persisted message and could flag `sawSetGoal` while extracting tool
   calls). If not sawSetGoal, call `completeTask` before returning.
2. **Idle sweep (case 2)** — new ticker in `continue.go` (or extend the
   existing one with a slower secondary tick), a new store query
   (`store.staleGoalSessions(ctx, idleThreshold)` mirroring
   `pendingContinuations`'s shape), and reuse of `resumeSession`'s
   live-persist injection for the nudge.
3. **Second-strike auto-close (case 2, continued)** — track nudge count (a
   new `agent_sessions` column, e.g. `completion_nudges int default 0`, or
   reuse the existing `summary`/attributes json instead of a schema change
   if that's preferable) so the sweep can tell "never nudged" from "nudged
   once already, still stuck."
4. **Backfill** — the 50 already-stuck live sessions won't get fixed by new
   code alone (they're historical). One-time cleanup: run the same
   case-1/case-2 classification against existing rows once the code ships,
   so the board doesn't show 50 permanently-orphaned "Running" cards on top
   of new correctly-terminating ones. This should be a script, not a manual
   UPDATE — the classification logic will already exist in Go.

## Fix 4, revised: deletion instead of backfill

The plan as written proposed backfilling the 50 already-stuck sessions with
a mechanically-assigned outcome (`success` for case 1, `partial` for case
2). When it came time to execute that, the operator raised a better
question: these were overwhelmingly one-off test/smoke-test sessions
("hi", "what's the hostname of lxc:caddy?") with no lasting value —
assigning them a fabricated `success` outcome would make the task board
lie in the opposite direction (claiming verified success on things nobody
verified). The operator's call: delete them instead of backfilling a
guessed outcome, with one condition — don't lose any recorded knowledge.

Before deleting anything, verified directly against the database (not
assumed from reading the code):
- Zero `documents` relationship edges exist linking any of the candidate
  sessions to any `knowledge_entities` row.
- Zero `upsert_knowledge` calls appear anywhere in the candidate sessions'
  transcripts.
- Zero `knowledge_entities` rows exist system-wide mentioning the one
  topic (`typetype`) the operator specifically asked to preserve.

`deleteSession` (`store.go:293`, already the live code path behind the
UI's "Delete task" button — reused as-is, not reimplemented) removes the
session, its messages, its own task entity, and that entity's relationship
edges — it never touches `knowledge_entities` rows or entities the task
merely referenced (e.g. `lxc:typetype` itself), only the provenance edges
back to the now-deleted task. Given the verification above, this was safe:
there was nothing to preserve because nothing had ever been recorded.

Executed in two batches, both via the same `DELETE /sessions/:id` route:
- **47 sessions** — the original candidate set from `curl
  localhost:8092/sessions`, all non-`done`/`failed` at the time.
- **6 more sessions** — found *after* the first batch, when they surfaced
  on the task board: `listSessions` (`store.go:193`) hardcodes
  `ORDER BY last_active_at DESC LIMIT 50` with no pagination, so the
  original audit's "50 sessions total" was actually "the 50 most
  recently active" — it silently excluded 6 older stuck sessions from
  2026-07-08 (predating the task-board feature entirely, same trivial
  "hi"/smoke-test pattern). Worth knowing about `listSessions`'s cap for
  any future audit of this table — a `count(*)` query directly against
  the database is the only way to get a true total.

Final state: `agent_sessions` holds exactly 3 rows — the two `done` and
one `failed` sessions produced during live verification of fixes 1-3.

## Implementation order

1. Fix 1 (inline safety net) first — it's the highest-leverage, lowest-risk
   change (self-contained, no schema change, covers 43/50 of the evidence).
2. Fix 2+3 (idle sweep + second-strike) — needs the schema decision
   (new column vs. attribute) settled first; smaller blast radius than 1
   but touches the ticker/worker machinery, deserves its own review pass.
3. Fix 4 (backfill) last, once 1-3 are deployed and verified live — running
   it before the code ships would just recreate the same gap for new
   sessions created in between.

## Verification

- After fix 1: start a few trivial one-shot chats against the live agent
  (`hostname`-style questions), confirm each session reaches `status=done`
  immediately after the answer, via `curl localhost:8092/sessions/:id` or
  the task board.
- After fix 2+3: manually let a goal-bearing session go idle past the
  threshold (or lower the threshold for a local test run), confirm the
  nudge appears in the transcript, then confirm second-strike auto-close
  fires if the nudge is ignored.
- Re-run the same audit query used to find this bug
  (`curl localhost:8092/sessions` → status histogram) a day after deploy;
  the "stuck active/planning forever" count should track only genuinely
  in-flight tasks, not accumulate.

## Open questions

- **Outcome for case-1 auto-complete**: always `"success"`, or worth a
  cheap heuristic (e.g. scan the final text for obvious failure language)?
  Recommend starting with always-`"success"` — SOUL.md's own trivial-task
  guidance doesn't distinguish, and a wrong "success" on a genuinely-failed
  one-shot lookup is low-stakes (the transcript still shows the real
  answer; nothing acts on the outcome besides the board's color).
- **Idle threshold (15 min) and nudge-to-close gap**: arbitrary starting
  points, not measured against real task durations — worth revisiting after
  a week of the new sessions' real timing data exists.
- **Schema change for nudge tracking**: a new column is simpler to query
  than packing state into existing JSON, but adds a migration — worth
  confirming that's acceptable before starting fix 2+3 (this plan defers
  that call to whoever implements it, per Implementation order above).
