# Voyage — Autonomy gates, profile system, observability

Imported from `CLAUDE.md` via pointer.

## Autonomy mode (`--gates`, v3.4.0)

All four pipeline commands accept `--gates {open|closed|adaptive}`:

| Value | Behavior |
|-------|----------|
| `open` | Skip optional checkpoints; trust manifests + verify gates only |
| `closed` | Stop at every autonomy boundary; operator confirms each transition |
| `adaptive` (default) | Stop only at meaningful boundaries (manifest-audit FAIL, plan-critic BLOCKER, main-merge gate) |

Under the hood: `lib/util/autonomy-gate.mjs` runs the state machine `idle → approved → executing → merge-pending → main-merged`. `lib/stats/event-emit.mjs` records each transition to `${CLAUDE_PLUGIN_DATA}/trek*-stats.jsonl`. The main-merge gate is the final autonomy boundary before HEAD lands on `main`.

### Path A/B/C decision (v3.4.0; Path C closed 2026-05-05)

Three architectural options were considered for the speedup work:

- **Path A — cache-first** (drop `--allowedTools` per child to recover cross-phase cache sharing): REJECTED. Inverts the security model; plugin hooks don't fire reliably in `claude -p` (research/06 GH #36071).
- **Path B — sequential `--no-ff` parallel waves with manifest-driven failure recovery**: CHOSEN. Ships in v3.4.0. Phase 2.6 of `/trekexecute` runs the wave executor with hardenings for plugin-in-monorepo + gitignored-state topology.
- **Path C — hybrid (cache-warm sentinel + identical-tool parallel)**: **CLOSED 2026-05-05.** Q3 experiment measured median `cache_creation_input_tokens` = 163,903 across 3 fork-children at 186K parent context (CC v2.1.128, Sonnet 4.6). Master-plan thresholds: ≤ 1,500 POSITIVE / ≥ 3,500 NEGATIVE. Result is solidly NEGATIVE — `CLAUDE_CODE_FORK_SUBAGENT` does not preserve cache prefix across identical-tool children at our context size. Path C migration is deferred indefinitely; reassessment is appropriate when CC v2.2.xxx ships fork-cache-relevant features. Harness: `scripts/q3-cache-prefix-experiment.mjs`. Companion analyser: `lib/stats/cache-analyzer.mjs`.

A revived Path C (post-v2.2.xxx) would require: (1) re-architecting tool-list to be identical across all wave children, (2) cache-telemetry analysis confirming the new fork-cache behaviour holds, (3) prompt-level deny re-enablement to compensate for tool scoping rollback.

## Profile system (`--profile`, v4.1.0)

Three built-in model profiles plus operator-defined `<custom>.yaml`. Each profile pins `phase_models` for the six pipeline phases (`brief`, `research`, `plan`, `execute`, `review`, `continue`). Profile is recorded in plan.md frontmatter as `profile: <name>` and emitted to `${CLAUDE_PLUGIN_DATA}/trek*-stats.jsonl` for cost-attribution.

| Profile | Brief | Research | Plan | Execute | Review | Continue | Use case |
|---------|-------|----------|------|---------|--------|----------|----------|
| `economy` | sonnet | sonnet | sonnet | sonnet | sonnet | sonnet | Lowest cost; high-confidence small-scope tasks (operator-opt-in via `--profile economy`) |
| `balanced` | sonnet | sonnet | opus | sonnet | opus | sonnet | Mixed — opus where reasoning depth pays off (operator-opt-in via `--profile balanced`) |
| `premium` (default) | opus | opus | opus | opus | opus | opus | Maximum quality — Opus on every phase. Default since 2026-05-13 operator request; also the hardcoded resolver default at `lib/profiles/resolver.mjs:145` |

### Lookup order

1. Explicit `--profile <name>` flag passed to the command
2. Plan-file frontmatter `profile:` (when resuming via `/trekexecute --resume` or `/trekcontinue`)
3. `VOYAGE_PROFILE` environment variable
4. Default `balanced`

### Custom profiles

Create `lib/profiles/<custom>.yaml` to define a new tier. The validator (`lib/validators/profile-validator.mjs`) enforces: every `phase_models[].phase` must be a known phase enum; every `phase_models[].model` must match `^(opus|sonnet)(\b|-).*` or one of the canonical short names. Custom profiles override built-ins of the same name (lookup is alphabetical with `<custom>` taking precedence).

Drift between plan-frontmatter `profile:` and step-manifest `profile_used:` emits a `MANIFEST_PROFILE_DRIFT` warning from `plan-validator --strict` (Step 20). Plan remains valid; the warning surfaces accidental tier-mismatch.

## Observability (Stop hook, v4.1.0)

The `Stop` hook in `hooks/hooks.json` runs `hooks/scripts/otel-export.mjs` at session-end. The hook is **opt-in** — when `VOYAGE_EXPORT_MODE` is unset or `off`, no work is done.

| Mode | Output | Endpoint env-var |
|------|--------|------------------|
| `off` (default) | _(no export)_ | — |
| `textfile` | `voyage.prom` (Prometheus exposition format) | `VOYAGE_TEXTFILE_DIR` |
| `otlp` | OTLP/JSON POST | `VOYAGE_OTEL_ENDPOINT` |

Endpoint validation: `VOYAGE_OTEL_ALLOW_PRIVATE=1` is required to send to loopback or RFC1918 destinations (CWE-918 SSRF mitigation). Allowlist `lib/exporters/field-allowlist.mjs` redacts records before export (CWE-212). Path validation (`lib/exporters/path-validator.mjs`) rejects symlink + traversal (CWE-22).

Local Docker Compose stack: `examples/observability/`. Operator docs: `docs/observability.md`. Both pin minimum versions per CVE history (`prom/prometheus:v3.0.1`, `grafana/grafana:11.4.0`, `otel/opentelemetry-collector-contrib:0.115.0`).