simplicio-loop

name

simplicio-loop

description

Unified public entrypoint for Simplicio's body-of-work orchestration: core + loop in one command. Use when the user types /simplicio-loop, says "ralph loop", "keep iterating until done", "finish all open issues", or asks to drain a queue of work autonomously. Runtime-agnostic: binds a real stop-hook where the host supports hooks (Claude, Cursor); otherwise self-paces via the host scheduler. The older /simplicio-tasks surface is a legacy alias; never escape the loop with a false promise.

/simplicio-loop — unified core + loop

A self-referential iteration primitive: the SAME goal is fed back after every turn, so the agent sees its own prior edits and converges. It exits ONLY when a typed completion-promise is genuinely true, or a hard max_iterations cap fires. This skill is now the unified public surface for Simplicio's autonomous work orchestration: queue intake, evidence-gated execution, and the hardened Ralph loop live behind the single command /simplicio-loop. The older simplicio-tasks surface remains only as a compatibility alias.

Credit: the technique is Ralph Wiggum / cursor ralph-loop. We keep its best parts — single human-readable state file, exact-match promise sentinel, two-hook split — and add the simplicio safety spine (evidence-gated promise, max-iteration cap, cross-platform hook).

For queue/body-of-work runs, pair this file with the shared deep references under ../simplicio-tasks/references/ for extension points, orchestration, token economy, delivery, and safety details.

Normative contract (non-negotiable)

These invariants are MUST-level. Any runtime that loads this skill (Simplicio Agent, Claude, Cursor, or a bare LLM) follows them mechanically — no paraphrase, no drift:

1. Evidence-gated exit. The loop MUST NOT terminate without concrete evidence, produced in the SAME turn, that the goal is met. No in-turn evidence → no exit.
2. Exact promise. Completion is gated by the EXACT sentinel <promise>EXACT TEXT</promise> equal to completion_promise verbatim. A paraphrase or a fuzzy "I'm done" never counts.
3. Deterministic continuation. If the promise is not satisfied, the next iteration MUST re-feed the current goal + state unchanged — a mechanical re-feed, never a manual "shall I continue?".
4. Bounded by construction. max_iterations MUST be set before iteration 1 unless the run is deliberately self-paced by a durable scheduler — the loop is NEVER accidentally unbounded — and the cap is checked BEFORE every continuation.
5. Single source of truth. All loop state lives in the one scratchpad below; the sibling .orchestrator/loop/done flag is touched ONLY when the promise is verified.
6. Fallback obeys the same contract. When the host has no hooks, the self-paced scheduler mode is first-class and MUST honor invariants 1–5 identically.
7. Definition-of-Done gate. No issue/task item may be marked done (task_backlog.py done) or closed unless its frozen acceptance criteria cover all seven DoD dimensions — see "Definition of Done" below. A partial pass (e.g. unit tests green but no coverage number, or an implementation with no regression/perf evidence) is NOT done; keep iterating.

The rest of this file is the mechanism that enforces this contract.

Definition of Done (DoD) — mandatory quality gate

Every task/issue anchored via task_anchor.py set MUST include, as explicit acceptance criteria (besides any goal-specific ones), evidence for all seven of:

1. ✅ Implementação — the change itself, present and working.
2. ✅ Testes unitários — unit-level coverage of the new/changed logic.
3. ✅ Testes de integração — the change verified against its real collaborators (no mocks for the seam under test).
4. ✅ Testes de sistema — an end-to-end pass through the actual command/CLI/API surface a user or caller would hit.
5. ✅ Testes de regressão — the existing suite still green; no prior behavior silently broken.
6. ✅ Benchmark de performance — a measured number (latency/throughput/memory) for any change that touches a hot path, so a regression is caught by a number, not a feeling.
7. ✅ Cobertura mínima — line/branch coverage ≥ 85% (target 90% where the toolchain reports branch coverage) for the touched files, checked with the project's own coverage tool.

Freeze these as ACs at intake (task_backlog.py init / task_anchor.py set) so task_anchor.py gate — the same worker already gating "done" on unverified ACs — refuses to let the loop declare completion or open the PR (pr_evidence.py build --require-evidence) until every one of the seven is verified with evidence, not asserted. When a goal is decomposed at Phase 0, each backlog item's plan.json entry MUST carry all seven as ACs (skip only the ones that genuinely do not apply — e.g. no perf benchmark for a pure docs change — and say why in the item).

When to use

• "/simplicio-loop finish all the open issues", "clear the CI queue", "drain the Jira board".
• "run a ralph loop on X", "iterate until the tests pass", "keep going until done".
• As the unified public entrypoint for unattended queue-drain or converge-until-done runs.
• For body-of-work / Phase-0 drains, freeze the backlog once (task_backlog.py init) and use task_backlog.py checklist / pr_evidence.py build --backlog ... so the PR shows the whole backlog table above the per-item anchor checklist, not just the current item.
• NOT for a one-shot edit — use the host's normal flow.

Bound operators (REQUIRED): survey + operate

This loop does NOT survey the repo with the LLM, and it does NOT hand-edit files with the LLM. Two installed CLIs are the operators; the model only DECIDES, the operators DO. The supported install surface is the operator package simplicio-cli, which exposes simplicio-dev-cli and also brings simplicio-mapper transitively for the survey step. Full mechanics (two-tier survey, evidence gate, context-pack, structured queries, docs-drift gates, the operator dispatch table): references/bound-operators.md.

Operator	CLI (binary)	Binds	Role in the loop
simplicio-mapper	simplicio-mapper	orient / recall	Survey — maps the repo(s) into .simplicio/*.json (project-map, precedent-index, symbol-index, call-graph, docs). This survey, not an ad-hoc LLM read, is what feeds the goal each turn.
simplicio-dev-cli	simplicio-dev-cli	execute / deterministic_edit / validate / diagnostics	Operate — applies a DECIDED change through its 6-layer contract (mapper context → precedent → prompt → diff → test → verify, ≤3 retries). The CLI edits and verifies; the AI does not hand-write the diff.

Preflight (MANDATORY, BLOCKING). Before iteration 1, announce the step, auto-update the operator package to its latest release, then confirm both runtime binaries are on PATH:

python3 scripts/loop_progress.py emit --step preflight --status begin --detail "operadores: verificação/atualização"
python3 -m pip install -qU simplicio-cli 2>/dev/null \
  || python3 -m pip install -qU --user --break-system-packages simplicio-cli 2>/dev/null || true
simplicio-mapper --version   # survey operator (expected transitively from simplicio-cli)
simplicio-dev-cli --help     # action operator (pkg simplicio-cli; exposes `simplicio-dev-cli`)
python3 scripts/loop_progress.py emit --step preflight --status end --outcome pass \
    --detail "simplicio-mapper X.Y.Z; simplicio-dev-cli OK"

Best-effort and offline-safe — a network/pip failure leaves the working version in place. The action binary is simplicio-dev-cli (from pip install simplicio-cli) — NOT the bare simplicio (that's the separate simplicio-runtime). If either runtime binary is missing, do NOT fall back to LLM survey/editing — emit python3 scripts/loop_progress.py emit --step preflight --status blocked --outcome blocked --detail "missing operator <name>", then STOP and print simplicio-loop: BLOCKED — missing operator <name>; run: pip install simplicio-cli.

Survey step (each loop start). python3 scripts/loop_progress.py emit --step survey --status begin → simplicio-mapper scan . --json (instant macro skeleton + background deep index) → gate with inspect . --json (artifacts exist on disk) → on a passing gate emit --step survey --status end --outcome pass --detail "context-pack pronto (pack_hash <hash8>)" (on a failing gate, --status blocked --outcome blocked) → feed the goal from handoff . --for-llm toon (a pre-compressed context-pack: files/symbols/deps/pack_hash, substitutes for re-reading the tree). For triage questions the map alone doesn't answer, simplicio-mapper ask . <impact|tests-for|callers|...> <arg> --json. Verify-side docs gates: sync . --check --json / drift . --check --json (BLOCK only when the AC itself is docs).

Decide step (etapa 4/9 — the model's own step, no worker). Immediately before delegating to the operator: python3 scripts/loop_progress.py emit --step decide --status end --source llm --detail "<one-line summary of the decided change, target AC>" — the only event whose detail comes from the LLM; the render never tags it MEASURED| (it's a decision, not a measurement).

Operate step (every turn that mutates code). Delegate the DECIDED, AC-scoped change to the operator — never hand-edit inside the loop:

python3 scripts/loop_progress.py emit --step operate --status begin --detail "operador: <target file>"
simplicio-dev-cli task "<the decided, AC-scoped change>" --target <file> [--json]
python3 scripts/loop_progress.py emit --step operate --status end --outcome pass|fail \
    --detail "verify do operador: <result>, tentativas usadas: n/3"

The operator applies the diff, runs the tests, and self-corrects up to 3× — its passing verification IS the in-turn evidence the promise gate needs (below).

Watcher step (etapa 6/9). scripts/watcher_verify.py verify emits its own end event AFTER watcher_state.json is written — never before (progress reports the gate, it never substitutes for it).

Journal step (etapa 7/9). scripts/loop_journal.py record emits end with outcome = gate; scripts/loop_journal.py stall on STALLED emits blocked — the NEXT turn's render opens with ⚠ STALLED (or ⚠ DRIFT, from task_anchor.py check) ahead of everything else.

One turn: preflight → survey (mapper) → triage (re-read survey, journal resume) → DECIDE (AI) → operate (simplicio-dev-cli task: apply+test+retry ≤3×) → watcher-gate (independent re-execution) → journal record → <promise> only if all gates passed. scripts/loop_journal.py's cmd_resume/ cmd_record/cmd_stall call loop_progress.emit_event() in-process (no subprocess per event) for the triage/journal steps; task_anchor.py check does the same on DRIFT.

Planning gate: task-intake contract + mutation authority (issue #284)

Between "claim the task" and "mutate the repo" the loop enforces a fail-closed planning gate so deep planning is a mechanical barrier, not prompt guidance. simplicio_loop/runner.py::arm_run() compiles the task contract, mapper context, and plan, then self-builds a planning-receipt.json (simplicio_loop/planning_gate.py::build_planning_receipt()) binding run_id/attempt/task_contract_hash/plan_hash/lease/fencing (and, on a GitHub source, the source-snapshot hash) into a single-use mutation_authority token. execute_operator() and execute_operator_batch() refuse to mutate without a receipt whose token matches the CURRENT identity tuple — a stale plan hash, rotated lease/fence, or edited GitHub issue invalidates it (reason_code in planning_not_ready/mutation_authority_invalid/source_drift).

Both halves of this gate are mandatory by default: SIMPLICIO_REQUIRE_MUTATION_AUTHORITY (checking) and SIMPLICIO_LOOP_AUTO_PLANNING_RECEIPT (the real dispatch path building the receipt the check needs) are unset-means-ON; only an explicit falsy value (0/false/no/off/legacy) opts a caller out, and an unrecognized value is treated as ON (fail-closed, never silently disabled by a typo). See docs/adr/0004-planning-gate-rollout.md for the rollout/migration strategy and references/planning-gate.md for the full schema, reason codes, and replan-on-drift mechanics.

Video evidence producer (hyperframes) — demo videos as proof

The loop can be asked to create a demonstration video of a screen/feature — e.g. /simplicio-loop make a demo video of the login screen — and it uses that video as in-turn evidence that the change works. The producer is hyperframes (https://github.com/heygen-com/hyperframes): it renders HTML/CSS/media compositions to a deterministic MP4 ("same input, same frames, same output"), so the video is a CI-reproducible artifact, not a one-off recording. No API keys; local render via headless Chrome + FFmpeg.

This is NOT a bound operator (it never BLOCKS the loop): it fires only when a turn's goal is a video request, or when a UI change wants a moving proof. The runnable worker is scripts/video_evidence.py; the full contract is references/video-evidence.md. One turn:

# 1. is this turn a video request?  (terminal intent gate, not the LLM)
python3 scripts/video_evidence.py detect --goal "<the re-fed goal body>"
# 2. capture the real screen (reuse web_verify — drives the UI, writes per-step PNGs)
python3 scripts/web_verify.py run --url <URL> --expect "<text>" --issue <N>
# 3. assemble those PNGs into a deterministic MP4 and attach it to the PR
python3 scripts/video_evidence.py verify --name <slug> --frames .orchestrator/tee/web \
    --title "<screen>" --issue <N> [--upload --pr <N>]

The MP4 path + the video_evidence: PASS … ledger row is the in-turn evidence the promise gate needs; a missing toolchain (Node 22+, FFmpeg, hyperframes) yields BLOCKED, never a fake pass — so a video that never rendered can never satisfy the promise.

State file (single source of truth)

.orchestrator/loop/scratchpad.md — human-readable, trivially editable/cancellable:

---
iteration: 1
max_iterations: <N or 0>          # 0 = scheduler-controlled; prefer a finite cap for manual runs
completion_promise: "<EXACT TEXT>" | null
evidence_required: true           # promise is rejected unless backed by a passing gate
mode: converge | drain            # which termination logic applies (see Two loop modes)
started_at: "<ISO-8601>"
---

<the task goal, verbatim — this body is re-fed every turn>

A sibling flag file .orchestrator/loop/done is touched only when the promise is verified.

Alongside it, .orchestrator/loop/journal.jsonl is the loop's durable attempt memory (one append-only record per turn: iteration, action, hypothesis, gate, failure fingerprint). The scratchpad holds the GOAL; the journal holds WHAT WAS TRIED — see § Run-journal + stall detector below. It is the difference between a loop that converges and one that oscillates.

The loop contract

1. Write the scratchpad with the goal, the cap, and the promise text. Always recommend a max_iterations safety net for manual runs; use 0 only when a durable scheduler and STOP signal own cancellation.
2. Triage the live state FIRST (mandatory). Before any action each turn, re-read the ground truth — the simplicio-mapper survey, git status/git diff, the scratchpad, AND the source of record (issues/PRs, branches, .orchestrator/loop/done). Read the attempt memory FIRST: python3 scripts/loop_journal.py resume (dead-ends to AVOID; since for incremental triage). Re-read the task anchor: python3 scripts/task_anchor.py check --goal "<goal>" --exit-code (a DRIFT verdict, exit 11, means STOP and re-anchor with --force, never wander). Before deciding the change, refresh the impact map (python3 scripts/impact_audit.py audit <root> --file <seed> --cover <known-file> --json, --fail-on medium for shared/public contracts) and, for cross-surface flows, the flow map (python3 scripts/flow_audit.py audit <root> --fail-on high --json). When a Phase 0 decomposition exists, also re-read the backlog (python3 scripts/task_backlog.py status). Journal = memory for ATTEMPTS; anchor = SCOPE; backlog = THE DECOMPOSITION; impact audit = BLAST RADIUS; flow audit = INTEGRATION. Act only on what's still genuinely open (idempotency). Full rationale + extra flags: references/triage-verify-detail.md. On a multi-session/multi-worktree repo, also run scripts/coordinator.py survey+decide per candidate issue — OWN/CONTINUE_OWN/ RECLAIM_STALE license work, DEFER_ACTIVE_CLAIM means don't duplicate a sibling session's claim. If EVERY issue comes back deferred, switch to reviewing open PRs against the DoD + issue ACs (scripts/pr_dod_review.py check --post) instead of idling. Full detail: references/multi-agent-coordination.md.
3. Work the goal each turn against that triaged state. The model DECIDES the AC-scoped change; the simplicio-dev-cli operator APPLIES and verifies it — never hand-edit inside the loop. End EVERY iteration with a concrete verification. After the operator passes, run the watcher producer: python3 scripts/watcher_verify.py verify — independently recomputes the frozen anchor's done/pending state from disk and writes .orchestrator/loop/watcher_state.json with {"match": true, "status": "MEASURED"} only when it agrees AND echoes the current challenge. Never hand-write watcher_state.json — a missing/unchallenged/mismatched state is UNVERIFIED and gates the promise. Re-run impact_audit.py/flow_audit.py if the edit surface expands. Then RECORD the attempt: loop_journal.py record --iteration N --action "<change>" --hypothesis "<why>" --gate pass|fail --gate-output <test.log> (failure output is fingerprinted so the same failure is recognised next turn). A turn that only edits without verifying is incomplete. Full detail: references/triage-verify-detail.md. Launch the verification command (tests/selftest/claims_audit.py) in the background and keep working the next unit of work instead of idling on it — same evidence requirement, only WHEN you block on the result changes. Full detail: references/background-verification.md.
4. Re-feed happens at turn end via the stop-hook (below). Each re-fed turn is prefixed [simplicio-loop iteration N. To finish: output <promise>TEXT</promise> ONLY when genuinely true.]. Before re-feeding, the stop-hook (or the self-paced tick) runs the stall check (loop_journal.py stall): if the loop is STALLED, it does NOT blindly re-feed the same goal — it switches strategy or escalates (§ Run-journal + stall detector).
5. Exit by emitting the sentinel <promise>EXACT TEXT</promise> — and ONLY when every acceptance criterion is met AND a real gate passed in the SAME turn (evidence_required) AND the watcher-gate confirms the result (watcher_state.json with match: true / status: MEASURED). The watcher re-executes the work independently before the promise is honored — corrective gate per Asolaria N-Nest pattern.

Two loop modes (different jobs, different termination)

A loop drains a queue and a loop converges a hard task — opposite dynamics, so the scratchpad mode selects which termination logic the driver uses. Pick it when arming; default converge for a single goal, drain for a work-queue.

	converge (single hard task)	drain (a queue of items)
Wants	depth — keep changing strategy until ONE thing passes	breadth — clear many independent items, idempotently
Each turn	triage since last turn (incremental) → one AC-scoped change → verify → watcher-gate → journal	claim next open item → implement → deliver → re-query source (the local Phase 0 backlog is a first-class source: re-query = task_backlog.py next; an empty print counts as a dry round, dry≥2 unchanged)
Termination	the evidence-gated <promise> fires, OR the stall detector says STALLED and escalates (below)	the source re-query returns empty for K consecutive rounds (dry≥2) AND the working set is idle
Anti-pattern it avoids	oscillation (retrying the same dead-end)	missing late-arriving work (stops too early)

Both still obey the universal exits (promise+evidence, max_iterations, STOP). The split only changes WHEN "naturally done" is declared: converge is done when the one task is proven or genuinely stuck; drain is done when the queue stays empty across rounds. Don't apply drain's "empty K times → done" to a single task (it would quit the moment a turn makes no visible change), and don't apply converge's stall-escalation to a queue (a stuck item should be quarantined, not halt the whole drain). simplicio-tasks Step 3 routes fast-path/heavy-path on top of this.

Phase 0 — intake & decomposition (no source / vague goal / genesis)

When the goal is vague and no external source (board/issues) supplies items, the LLM brainstorms the decomposition — subtasks with ≥1 acceptance criterion each, depends_on, risks — and MUST freeze it BEFORE any edit: python3 scripts/task_backlog.py init --goal "<goal verbatim>" --item-file plan.json (the worker refuses an empty plan, a zero-AC item, or an unknown/cyclic dependency — the AI decides, the worker freezes, orders and gates). State: .orchestrator/backlog/backlog.jsonl.

Scaffolding a new repo. Put exactly one explicit scaffold item first in plan.json (structure + toolchain + one minimal green test as its ACs) and make every later item depend on it. After that item passes, re-run simplicio-mapper scan . --json before claiming the next item — the survey only becomes useful once there is code to map.

Per-item cycle: python3 scripts/task_backlog.py next claims one ready item and prints its id, goal, lease owner, and fencing token → freeze that item's goal/ACs with task_anchor.py set → work it under the normal converge contract → python3 scripts/task_backlog.py done --item T1 (exit 12 unless the current anchor is this item with every AC verified) → next again. status/poll provide the deterministic drain signal and active-lease view.

HRM-style hierarchical planner (two-level reasoning loop)

Inspired by the Hierarchical Reasoning Model (arXiv:2506.21734, JesseBrown1980/HRM), the loop runs a slow high-level planner (scripts/hierarchical_planner.py plan, called by loop_stop.py before each re-feed) that MAY write a new phase (.orchestrator/loop/phase.json: explore → debug → harden → refactor → implement → escalate) on top of the fast low-level executor (the normal per-turn re-feed, which executes one AC-scoped change within the current phase and never changes it itself). Deterministic and model-free; the loop runs flat if the planner script is missing. hierarchical_planner.py status reads the current phase before deciding the next action; plan forces a replan; clear resets to flat mode. Full phase table + usage: references/hierarchical-planner.md.

Cross-agent persistent wiki (.orchestrator/wiki/)

Every turn's key decisions, findings, and dead-ends are captured into a persistent markdown wiki at .orchestrator/wiki/ (scripts/cross_agent_wiki.py capture|summary|handoff|status) — a per-project, cross-agent, zero-friction knowledge base that survives across agent vendors (Simplicio Agent → Claude Code → Codex): a fresh agent reads it and sees "where we left off" with no transcript. Plain markdown, no vector DB. Full structure + per-turn mechanics: references/cross-agent-wiki.md.

Run-journal + stall detector (the loop's working memory)

A re-feed loop with no memory of its own attempts re-derives the same triage every turn and oscillates (tries X, fails, tries X again until the cap burns). scripts/loop_journal.py closes both, deterministically: the run-journal (.orchestrator/loop/journal.jsonl, append-only, one record per turn with a normalized failure fingerprint) is the loop's memory of WHAT WAS TRIED; the stall detector (loop_journal.py stall) returns PROGRESS | STALLED — STALLED means the last K (default 3) attempts share the same fingerprint, and names the dead-end actions to avoid. Full mechanics: references/run-journal-stall-detector.md.

python3 scripts/loop_journal.py resume            # triage: distinct actions tried + AVOID list
python3 scripts/loop_journal.py record --iteration N --action "<change>" \
    --hypothesis "<why>" --gate pass|fail --gate-output <test.log>
python3 scripts/loop_journal.py stall --k 3 --exit-code   # before re-feeding: PROGRESS or STALLED

STALLED means do NOT re-feed the same goal into the same failure — switch strategy, escalate to the human_gate with the fingerprint + dead-ends, or (headless) stop blocked. This upgrades invariant 3 (Deterministic continuation): the next iteration re-feeds the goal and the attempt memory.

Progress feedback (issue #298, EPIC #296)

scripts/loop_progress.py is the ONE place "onde estamos / quanto falta" is computed — deterministically, from task_backlog.py items + task_anchor.py ACs + its own event trail, never fabricated. It writes .orchestrator/loop/progress.jsonl (events), progress.json (snapshot, never authoritative — always recomputed) and PROGRESS.md (human render). Every stage calls emit; the transcript re-feed header calls render --turn-header. Full contract: references/progress-feedback.md.

python3 scripts/loop_progress.py emit --step operate --status begin --item T3
python3 scripts/loop_progress.py render --turn-header   # MEASURED|... 42% geral · iter 7/24
python3 scripts/loop_progress.py status --json          # machine-readable snapshot

Delivery/entrega (issue #301): web_verify.py/video_evidence.py/pr_evidence.py build all emit evidence begin/end/blocked; pr_evidence.py build auto-includes a ## Progresso do run section whenever a backlog/anchor exists (never a fabricated %); pr_evidence.py progress-comment --issue N publishes ONE idempotent, rate-limited, fail-open progress comment on the issue. hooks/loop_stop.py emits the final refeed_exit event on every stop path, so progress.json's run_state (running|done|capped|handoff|stopped) never stays stuck mid-run.

The promise is evidence-gated (the simplicio hardening) + watcher-gate (pre-promise)

The classic Ralph loop trusts the model to be honest. We do not. A <promise> is accepted only if, in the SAME turn, there is concrete evidence the work is truly done, AND the watcher-gate has independently verified the result:

• the watcher-gate — python3 scripts/watcher_verify.py verify independently recomputes the anchor's done/pending state and writes .orchestrator/loop/watcher_state.json with {"match": true, "status": "MEASURED"} only when it agrees AND echoes the current per-iteration challenge (watcher_challenge.json) — never hand-write this file, or
• the run-verification gate passed ("works, not just compiles") — the simplicio-dev-cli operator's passing test+verify satisfies this, or
• the flow coverage gate passed for a mixed front/back/service change — python3 scripts/flow_audit.py audit <root> --fail-on high found no unhandled UI/API/service gaps (mechanically required by the stop-hook whenever the diff touches web-surface files), or
• the scope/impact gate passed for changed shared files — impact_audit.py audit <root> --file <seed> ... found no uncovered reverse dependents, or
• each named acceptance criterion has a file:line/command-output receipt — mechanically enforced by python3 scripts/task_anchor.py gate --exit-code (must return READY; exit 12 = still pending, a contract violation exactly like missing evidence), or
• for a queue, the source re-query confirms the items are actually closed/merged, or
• a demo video — a deterministic MP4 via the video_evidence producer (above) whose ledger row + MP4 path prove the feature works end-to-end; REQUIRED when the goal itself was "make a demo video of screen X".

A <promise> with no evidence in-turn — OR with a failing watcher-gate — is a contract violation: the capture hook ignores it (does not raise done) and the loop continues. Never output a false promise to escape the loop. This wires the loop directly into the repo's hard rule: never close work without a merged PR or concrete evidence.

Closing is evidence-gated too (no false positives). Declaring an item done — or closing an issue — requires BOTH a live source re-query (the item is actually still open right now) AND concrete evidence in the code or a linked/merged PR. A self-reported "done" with no live state and no artifact is a false positive and is rejected, exactly like a bare promise.

Claims-gate discipline — MEASURED/UNVERIFIED tagging

Every claim the loop makes — in the journal, in triage, in the exit promise, or in any turn output — MUST be tagged MEASURED\| (backed by in-turn, concrete, non-model evidence: a passing gate, a file:line receipt, a test log) or UNVERIFIED\| (an inference, hypothesis, or best-effort summary with no mechanical proof this turn). This is the Asolaria claims-gate discipline (eight enforcement rules — ground-impact-first, no bare tuples, mirrors≠authority, etc.), so no output escapes without a truth-class label. loop_journal.py record/resume/ status/stall all auto-tag their output; loop_journal.py claims-gate --check audits any blob for untagged claims. Full eight-rule table + worked examples: references/claims-gate.md.

Binding the hook (deterministic, near-zero token)

Where the host runtime supports lifecycle hooks, bind the two cross-platform hooks shipped in hooks/ (Python, so they run identically on Windows/macOS/Linux — see hooks/hooks.json):

Hook	Fires	Job
afterAgentResponse → loop_capture.py	after every turn	extract <promise>…</promise>; if it exactly equals completion_promise AND in-turn evidence exists → touch .orchestrator/loop/done. Fire-and-forget, exit 0. Never stops the loop itself.
stop → loop_stop.py	when the turn ends	guard clauses that each end the loop cleanly: no/corrupt scratchpad → stop; bound operator missing → write HANDOFF.md, stop (never silently hand-survey/hand-edit); done flag present → stop; iteration >= max_iterations → HANDOFF.md + stop (cap); spindle handoff latched → HANDOFF.md + stop. Before the promise check it runs the watcher-gate (rejects on match: false/stale challenge) and the flow-audit gate (rejects a web-touching diff with no fresh green flow-audit.json); a fallback journal record fires if the turn forgot one. Else increments iteration and re-feeds {"followup_message": "<header>\n\n<goal body>"}.

Detection (capture) and termination (stop) are split on purpose — neither parses the other's inline state. Iteration carries forward through git history + the working tree, not context stuffing, so token cost per cycle stays flat.

Self-paced drive (no hooks — a first-class path)

Hooks are an optimization, not a requirement: the self-paced drive is a primary way to run this loop, equal in standing to the hook-bound one. When the host has no hook layer — or hook delivery is not guaranteed — self-pace the loop with the host scheduler, exactly the simplicio-tasks watcher mechanism (Step 3b "Arming the watcher"). Default to self-pacing whenever hook delivery is uncertain rather than assuming a hook will re-feed the goal:

• Host-native durable scheduler / OS cron / a session /loop re-invoking this skill.
• Each tick: render --turn-header first (echoed) → read scratchpad → do one iteration → check the promise+evidence → render --full last (regenerates PROGRESS.md) → if true, delete state and stop; else increment and reschedule.
• Same exit conditions: promise verified, cap reached, spindle handoff latched, or explicit STOP.

Cancel

Delete .orchestrator/loop/ (the cancel-ralph analogue). A single STOP signal (flag file .orchestrator/STOP or a channel command) halts cleanly between iterations.

Post-merge cleanup (mandatory)

Once a PR the loop opened is merged into main, run scripts/worktree_cleanup.py to delete the branch (local + remote) and, if the work happened in a dedicated worktree, remove it too. It fails safe: skips if the PR isn't actually MERGED, or if the worktree/branch has uncommitted changes (both branch and worktree deletion are skipped together in that case).

python3 scripts/worktree_cleanup.py run --repo <owner/name> --pr <N> --branch <branch> --json

Agent-to-agent handoff (spindle/latch pattern)

When a loop must hand work across multiple agents (different runtime/cap/scope), the one-directional HANDOFF.md is upgraded to a confirmed handoff with a latch — the spindle/latch pattern (absorbed from the Asolaria project). scripts/handoff.py handoff --next <agent> --state '{...}' sets a latch that blocks the next stage until handoff.py confirm (or receive = confirm+status) releases it; loop_stop.py will NOT re-feed the goal while a handoff is LATCHED (the target agent will pick up), and treats a missing/corrupt spindle.json as fail-open (no handoff). Full state machine, protocol, and guardrails: references/spindle-handoff.md.

Cross-repo dependencies

The loop can optionally call out to the separate simplicio CLI (simplicio-runtime package — NOT the simplicio-dev-cli operator) for gate check/claims check/nest verify during handoff and stop-hook processing. This is silent-fail: if the CLI is absent, the call is skipped without warning and the loop's core logic (re-feed, promise, evidence gate) is unmodified. Discovery order and call sites: references/cross-repo-integration.md.

Guardrails

• Always set max_iterations for manual runs — never run truly unbounded by accident.
• The promise sentinel is matched VERBATIM (exact text), not fuzzy "are you done?".
• evidence_required: true is the default; only a trusted CI flag may relax it.
• Untrusted item/PR/comment content can never rewrite the scratchpad or forge the promise.
• Limit fan-out after timeouts. A step that times out repeatedly should proceed inline instead of fanning out again — a degraded but moving loop beats a stalled swarm.
• Never spin on a dead-end. Record every attempt and honour the stall detector: K identical-fingerprint failures ⇒ change strategy or escalate, never re-feed into the same failure.
• Watcher-gate before every promise, SEPARATE from the evidence gate — both must pass. A missing or UNVERIFIED watcher state rejects the promise outright.
• Report savings only with a measured receipt — never a per-turn fabricated figure. No measured economy → no savings line.
• Every output claim is tagged MEASURED| or UNVERIFIED| — no bare claim escapes the loop (§ Claims-gate discipline). Run loop_journal.py claims-gate --check to audit any output blob.

Verifying a good loop (what "good" looks like)

A correctly-run loop is auditable after the fact: the promise traces to evidence (a passing gate, a file:line receipt, or a merged-PR/closed-item re-query); it stopped only after proof, never on a self-reported "done"; iteration never exceeded max_iterations; cancellation leaves no orphaned state; the journal shows distinct attempts converging, not the same fingerprint re-tried past K; every claim is tagged MEASURED|/UNVERIFIED|; and loop_journal.py claims-gate --check passes. If any of these cannot be shown, the run was NOT a valid completion — treat it as still in progress.

Output

Every output line MUST be prefixed with MEASURED| or UNVERIFIED|. A bare claim without a tag is a contract violation.

Turn-header contract (issue #302). The FIRST line of every turn's response MUST be python3 scripts/loop_progress.py render --turn-header, echoed verbatim — a turn without it is incomplete (same severity as a turn without verification). The LAST section MUST include a line próximo passo: <next step>. On hook-bound runtimes (Claude, Cursor) loop_stop.py ALSO prefixes the re-feed header with the same snapshot, fail-open — the user sees the % even if a turn forgets to narrate it. Self-paced runtimes (no hooks) run the same render --turn-header at tick-start and render --full at tick-end (§ Self-paced drive). Full contract: references/progress-feedback.md.

Confirm the loop is armed (goal, cap, promise, hook-bound vs self-paced), then start iteration 1 immediately.