H: observerd — autonomous-iteration witness loop (SPEC §2 port)
Port of the load-bearing pieces of mcp-server/observer.ts (Rust
system, 852 lines TS) per SPEC §2's named target. Implements PRD
loop 3 ("Observer loop — watches each run, refines configs").
Routes (all under /v1/observer/* via gateway):
GET /observer/health — liveness
GET /observer/stats — total / successes / failures /
by_source / recent_scenario_ops
(matches Rust JSON shape exactly)
POST /observer/event — record one ObservedOp; auto-defaults
timestamp + source, validates required
fields (endpoint), persists to JSONL,
appends to ring buffer
Architecture:
- internal/observer/types.go — ObservedOp model + Source taxonomy
(mcp / scenario / langfuse / overseer_correction). Mirrors the
Rust shape so JSON round-trips during cutover.
- internal/observer/store.go — Store + Persistor. Ring buffer cap
matches Rust's 2000; recent_scenarios cap matches Rust's 10.
Same persist-then-apply order as pathwayd; same corruption-
tolerant replay (skip malformed lines + warn).
- cmd/observerd — :3219 HTTP service, fronted by gateway as
/v1/observer/*.
- lakehouse.toml + DefaultConfig — [observerd] block matches the
pathwayd pattern (Bind + PersistPath; empty path = ephemeral).
Tests + smoke (all PASS):
- 7 unit tests in store_test.go: validation, default fields,
stats aggregation, recent-scenarios cap + ordering, ring-buffer
rollover at cap, JSONL round-trip persistence, corruption-
tolerant replay (1 valid + 1 corrupt + 1 valid → 2 applied)
- scripts/observer_smoke.sh: 4 assertions through gateway —
record 5 events (3 ok / 2 fail across 2 sources), stats
aggregates correctly, empty-endpoint→400, kill+restart preserves
via JSONL replay (5 ops, 3 ok, 2 err survive)
Deferred (named in package + cmd doc, not in this commit):
- POST /observer/review (cloud-LLM hand-review fall-back). The
heuristic-only path could land cheaply but the productized
cloud path (qwen3-coder fall-back) is multi-day port.
- Background loops: analyzeErrors, consolidatePlaybooks,
tailOverseerCorrections (read overseer_corrections.jsonl into
the ring buffer once per cycle).
- escalateFailureClusterToLLMTeam (failure clustering trigger
that posts to LLM Team's /api/run with code_review mode).
/relevance is NOT duplicated — already ported in 9588bd8 to
internal/matrix/relevance.go (component 3 of SPEC §3.4).
16-smoke regression all green (D1-D6, G1, G1P, G2, storaged_cap,
pathway, matrix, relevance, downgrade, playbook, observer).
13 binaries now: gateway, storaged, catalogd, ingestd, queryd,
vectord, embedd, pathwayd, matrixd, observerd, mcpd, fake_ollama
(plus catalogd-only test build).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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