| name | daemon-manual |
| description | Operational guide for the `daemon` tool — how to inspect, debug, and reason about emanations (the agent fragments you spawn for parallel sub-tasks).
Reach for this manual when:
- You called `daemon(action="emanate", ...)` and the emanation has been
running long enough that you want to know if it's stuck, slow, or
working — without killing it on a hunch.
- An emanation finished with `state=failed` or `state=timeout` and you
need to figure out why.
- You want to inspect on-disk artifacts of a past emanation (chat
transcript, token spend, event log) — the folders persist forever and
`daemon(action="list")` only shows currently-active runs.
- You're trying to understand why your token totals don't match the sum
of what your tools claim — daemon spend is tagged into your parent
ledger and may explain the gap.
This manual covers: the on-disk folder layout under `daemons/em-N-*/`, exactly which fields in `daemon.json` answer "is it stuck?" vs "is it thinking?", how to tail `chat_history.jsonl` to see latest progress, where token attribution lives, how `reclaim` interacts with persistence, and a worked example of inspecting a 5-minute-running emanation.
Does NOT cover: the daemon tool's argument schema (in the tool description itself) or the cross-process recovery / orphan-detection mechanics (those need separate spec work).
Companion: `lingtai-kernel-anatomy reference/runtime-loop.md` covers the broader agent runtime that emanations are mini-versions of. Read that first if you don't yet understand the turn loop, then come here for daemon-specific inspection patterns.
|
| version | 0.2.0 |
daemon manual
The daemon tool's schema description covers the happy path. This manual is the deeper reference: how to inspect a slow or failed emanation, the on-disk artifact layout, and worked examples.
Each emanation is a forensic mini-avatar
Every time you call daemon(action="emanate", tasks=[...]), each task gets a working folder under daemons/ in your own directory. The folder is named:
daemons/em-<N>-<YYYYMMDD-HHMMSS>-<6 hex>/
where em-<N> is the in-context handle (e.g. em-3). The handle resets to em-1 after reclaim, but the timestamp+hash means historical folders never collide. Folders persist forever — reclaim only stops processes, not files. They're cleaned up incidentally when you molt (which wipes the working directory).
This means: when an emanation looks stuck, you can read its actual state instead of guessing. Don't kill it on a hunch — inspect first.
Folder layout
daemons/em-3-20260427-094215-a1b2c3/
├── daemon.json ← identity card + live status snapshot
├── result.txt ← full terminal result when available
├── .prompt ← system prompt as built (forensic)
├── .heartbeat ← mtime touched on every write
├── history/
│ └── chat_history.jsonl ← full LLM transcript
└── logs/
├── token_ledger.jsonl ← per-call token usage
└── events.jsonl ← daemon_start, tool_call, tool_result, cli_output, daemon_done/...
Inspection patterns
"Is this emanation actually doing anything?"
Read daemon.json once. The fields you want:
state — running / done / failed / cancelled / timeoutcurrent_tool — "read" / "bash" / null. If null while state=running, the emanation is waiting on the LLM. If non-null, it's executing that tool.turn — which LLM round the emanation is ontool_call_count — how many tool dispatches it has donetokens — running totals (lingtai backend only; stays at 0 for claude-code and codex backends — see "CLI backends" below)last_output / last_output_at — recent stdout/stderr from CLI backendsresult_preview / result_path — bounded terminal preview and full result.txt path after completionelapsed_s — wall clock since start
If current_tool is null AND tool_call_count hasn't changed for a while, the LLM is thinking — wait. If current_tool is set and stays set, that tool is slow (e.g., a big file read or a long bash command).
"What has it figured out so far?"
Tail history/chat_history.jsonl. Each line is one role/turn entry:
{role: "user", kind: "task"} — the original task{role: "assistant", text: "..."} — what the emanation said{role: "user", kind: "tool_results"} — what the tools returned{role: "user", kind: "followup"} — your daemon(action="ask", ...) messages
Read the most recent assistant text to see the latest progress narrative.
"What did it spend?"
Either of:
daemon.json field tokens — running totals across the whole runlogs/token_ledger.jsonl — per-call entries, sortable by line
The same per-call entries are also in your own logs/token_ledger.jsonl (the parent's), tagged with source: "daemon" and em_id. Your lifetime token totals (what sum_token_ledger reports) include all daemon spend.
"Why did it fail?"
Read daemon.json's error field — {type, message}. For more depth, tail logs/events.jsonl for the daemon_error event and look at the preceding tool_call/tool_result entries to see what was happening just before the failure.
Polling cadence — when, how often, and which call
First principle: completion is push-notified, not polled. When an emanation reaches a terminal state (done, failed, cancelled, timeout), the kernel publishes a compact entry to .notification/system.json naming the em-id and pointing at daemon(action="check", id="em-N"). You do not need to poll to discover completion. If you find yourself running check repeatedly waiting for a state transition, stop — you're duplicating work the kernel is already doing.
You do need to poll when:
- You suspect an emanation is stuck (long elapsed wall-clock, no recent activity signals).
- You need a mid-flight progress update for your own planning (e.g., before dispatching a second emanation that depends on the first's partial finding).
- A CLI-backend emanation has been silent and you want to read
last_output to gauge progress.
Cadence decision tree
Use elapsed_s (from daemon.json or list) to pick an interval. These are starting points, not laws — adjust for task type and your own expected duration.
elapsed_s | Default interval between checks | Rationale |
|---|
| 0 – 60 s | Don't check. Trust the dispatch; do other work. | Emanations almost never hang in the first minute. Polling here is pure noise. |
| 60 – 300 s | If you genuinely need progress, one check around 120 s, then back off. | Most one-shot tasks (file scan, focused research) finish in this band. |
| 300 – 900 s | Check at most every 2–3 minutes. | Long synthesis or multi-file work. Notification will fire on completion. |
| 900 s + | Check every 5 minutes only if you suspect a stall; otherwise wait for the notification. | If you've gone 15+ minutes with no last_output change AND current_tool=null AND tool_call_count unchanged across two consecutive checks → apply the stall heuristic below. |
Never poll at sub-30-second intervals. Each check returns up to last events plus a daemon.json snapshot; under 30 s of activity you'll see at most one new event, and the call costs tokens in both the request and the result. If you want a tighter loop, the task is probably wrong for an emanation — run it inline.
Which call to use, in order
daemon(action="list") first when multiple emanations are in flight and you want a status sweep. Cheap; one line per emanation with elapsed_s and state. Use it to decide which (if any) to investigate.daemon(action="check", id="em-N", last=20, truncate=500) when one emanation looks suspicious. last=20 covers ~10 tool dispatches; bump to last=50 for wider history. Keep truncate=500 unless you specifically need full tool I/O.- Direct
Read of daemon.json — only when you need a field check doesn't surface (rare). Prefer check.
tail of history/chat_history.jsonl — when check events don't tell you what the LLM is thinking. The last assistant text shows the current line of reasoning. (lingtai backend only — CLI backends don't write the LLM transcript here.)
Stall heuristic (before you reclaim)
Before reclaiming, confirm all of:
state == "running" and elapsed_s exceeds ~2× what you'd reasonably expect for the task.current_tool is the same value (or null) across two check calls ≥ 3 minutes apart.tool_call_count is unchanged across those two checks.- For CLI backends:
last_output_at is older than 5 minutes.
- For lingtai backend: no new entries in
chat_history.jsonl between the two checks.
If any of those is false, the emanation is making progress — wait. Reclaim is destructive: the work in flight is gone (folders persist but the process is killed).
Backend-specific polling notes
lingtai backend (default). Rich introspection: current_tool, turn, tool_call_count, tokens, and chat_history.jsonl all update in real time. Lean on these. You almost never need to look more often than once every 2–3 minutes.
claude-code and codex backends. turn is not incremented, tokens stays at 0, and the LLM transcript is not in chat_history.jsonl (it lives in the external CLI's own session store). Your live signals are:
last_output / last_output_at in daemon.json — updates per assistant turn for claude-code, per item.completed for codex.current_tool — tracks the CLI's own tool calls (set on tool_use / cleared on tool_result).logs/events.jsonl cli_output entries — stdout/stderr stream.
Because the only progress signal is last_output_at, the right cadence on CLI backends is "compare last_output_at to now()" rather than a fixed interval: if it advanced since your last look, the emanation is alive; if it hasn't advanced in 5+ minutes AND current_tool is unchanged, apply the stall heuristic. Don't confuse a slow tool (large bash, big file read) with a stall — check current_tool first.
Anti-patterns
- Poll-for-completion loops. Wrong because completion is pushed. A
while state == "running": sleep pattern is working against the system — do other work or yield; the notification will tell you when there's something to inspect.
check immediately after emanate. The first 30 seconds are almost always model warmup + initial tool calls; nothing actionable. Save the call.- Reclaiming on a hunch. See the stall heuristic. Default to "let it cook."
check with last=1000, truncate=0. Dumps the full event log into your context. Use targeted last=20 and only widen if needed.
Resting while daemon work is pending: set a cron notification reminder
If the daemon is healthy but unfinished and you are about to rest, do not keep polling and do not rely on memory. Set a lightweight wakeup reminder through the bash-manual section "One-shot wakeup reminders via .notification/cron.json".
Use this when:
- a Claude Code / Codex backend task is still running but has enough context to finish alone;
- you opened a PR and want to check CI/mergeability later;
- a render/download/build/test run is expected to complete after you sleep;
- the human asked for a later follow-up and the reminder is for you, not for them.
The reminder should say what is pending and what to check, for example:
⏺ Codex active. Plot regenerated (362KB, 23:38) — waiting for caption + commit. Polling at 23:42.
When the cron notification wakes you, read pad first, inspect the relevant daemon/job/PR, act, then dismiss the channel with system(action="dismiss", channel="cron").
This complements the polling rule above: completion is push-notified, stalls are inspected sparingly, and deliberate rest gets one future reminder rather than a busy loop.
Worked example: a daemon that's been running 5 minutes
You called daemon(action="emanate", ...) for em-3, asked it to "scan src/ for security issues", and it's been running 5 minutes. You're nervous.
read("daemons/em-3-20260427-094215-abc123/daemon.json")
bash("tail -n 20 daemons/em-3-20260427-094215-abc123/history/chat_history.jsonl")
bash("tail -n 10 daemons/em-3-20260427-094215-abc123/logs/events.jsonl")
That's a healthy pattern: the LLM is between tool calls, has good progress narrative, and is steadily working through files. Don't reclaim. Let it cook.
API note: daemon(action="list")
list reports only currently-active emanations (in-memory registry). It includes run_id and path so you know where to read on disk. Historical (completed/failed/cancelled) emanations don't appear in list — find them with bash("ls daemons/") instead.
CLI backends
The backend parameter selects the execution engine for emanations. Default is lingtai (the built-in ChatSession loop). Two external CLI backends are also available:
| Backend | CLI command | Session resume | Notes |
|---|
lingtai | (built-in) | N/A — in-process ask | Default. Uses preset resolution, tool surface curation, model routing. |
claude-code | claude --print --dangerously-skip-permissions --output-format stream-json --verbose --name <em_id> <task> | claude --resume <claude_session_id> via ask | Session ID captured from the first event of the stream-json output (typically within ms of process start), so ask is usable as soon as emanate returns — even while the initial task is still running. |
codex | codex exec --json --dangerously-bypass-approvals-and-sandbox <task> | codex exec resume <codex_session_id> via ask | Mirrors claude-code. thread.started event carries the session id (codex internally calls it thread_id), captured immediately. ask resumes the same conversation context. |
When to use CLI backends: When the task benefits from a different agent runtime's tool surface (e.g., Claude Code's built-in file editing, Codex's sandboxed execution) rather than the lingtai emanation's curated tool set.
CLI backends skip preset resolution — the external CLI manages its own model, tools, and permissions. The tools field in the task spec is ignored for CLI backends.
Working directory: Both CLI backends run in the parent agent's working directory (_working_dir), not in the emanation's daemons/em-N-*/ folder. The daemons/ folder is used for tracking state (daemon.json, logs) and terminal output (result.txt).
Progress delivery: CLI stdout/stderr is persisted to the run directory as cli_output events and daemon.json.last_output; it is not injected into the parent as ordinary [daemon:em-N] request text. Completion/failure publishes one compact system notification telling the parent which daemon finished and to inspect it with daemon(action="check", id="em-N").
Claude Code backend specifics. The backend streams structured JSON events from Claude Code in real time (--output-format stream-json --verbose):
daemon(check) sees live progress as each assistant turn arrives — last_output updates per turn and current_tool tracks Claude Code's own tool calls (set on tool_use blocks, clear on the matching tool_result). Note that tokens stays at 0 — Claude Code runs through its own provider account and we deliberately don't merge its usage fields into the kernel's token ledger (they'd mix with native LLM-adapter accounting that has different cache semantics). Spend is visible to the human via Claude Code's own UI and the cli_output event stream.claude_session_id is set on the first event that carries a session id (typically the system init event, within ms of process start). This means daemon(action="ask", id="em-N", message="...") works the moment emanate returns — you don't have to wait for the initial task to complete. (Earlier versions wrote the session id only post-hoc by scanning ~/.claude/projects/; that scan is now a fallback for the unusual case where the stream never carried a session id.)- stderr is captured to its own pipe (no longer merged into stdout) and persisted as
cli_output events with stream="stderr", so API errors, auth failures, and rate limits are visible during the run rather than buried in a buffered stdout.
turn is not incremented for CLI backends — Claude Code runs its own LLM loop and we don't see "turns" in the same sense. Use last_output and cli_output events to gauge progress.- An
is_error=true in the final result event is surfaced as a failed emanation even when the underlying process exited 0, so an error reported inside the LLM stream doesn't masquerade as success.
Codex backend specifics. Identical observability + resumability story as claude-code, with codex's own event vocabulary (--json):
daemon(check) sees live progress: last_output updates as each item.completed event with type=agent_message arrives. Note that tokens stays at 0 — codex runs through its own provider account, and its cached_input_tokens semantics differ from the kernel's LLM adapters (codex's input_tokens already includes the cached portion, anthropic's doesn't), so we deliberately don't merge codex's usage into the token ledger. Spend is visible via the codex CLI's own output and the cli_output event stream.codex_session_id (stored as daemon.json.codex_session_id) is set on the first event — {"type":"thread.started","thread_id":"<uuid>"} — within ms of process start. daemon(action="ask", id="em-N", message="...") runs codex exec resume <codex_session_id> --json "<message>" and surfaces the resumed turn's reply text the same way emanate does.- stderr is captured to its own pipe (was: merged into stdout via
--ephemeral mode) and persisted as cli_output events with stream="stderr".
- Codex doesn't emit an
is_error flag like Claude Code; the kernel treats absence of a turn.completed event (combined with no captured agent_message items) as failure even when the process exits 0.
--ephemeral is intentionally NOT passed: it would disable session persistence and break daemon(ask). Sessions persist under ~/.codex/sessions/ and can be re-resumed by ID for the lifetime of the session record.
What the manual does NOT cover
- Provider routing / LLM presets — deferred to a separate spec.
- Cross-process recovery — if your kernel restarted mid-daemon, the folder may show
state=running indefinitely. Compare now() vs .heartbeat mtime to detect orphans.
- Folder cleanup — there is none. Molts wipe the working dir. For non-molting agents, you may eventually want to
rm -rf daemons/em-*-2026-04-* manually.
