cc-os/plugins/os-orchestration/eval

os-orchestration eval — E1–E3 (session-orchestration behavior)

Created: 2026-07-06. Scenarios sourced from the verified misses in docs/orchestration-audit/2026-07-06-findings.md (clusters 1–3), per the IRL-feedback-loop methodology. E4 (batch planning) deliberately deferred.

Measures whether an orchestrating session follows the shipped ORCHESTRATION.md (the 2026-07-06 trigger-conditioned wording) mid-task: explicit model: per spawn, resolved-model verification, delegation thresholds, and not re-covering its own ground. This validates the wording fixes the way Eval B/C validated os-adr's — the untuned baseline is the production audit itself.

HELD-OUT DISCIPLINE: never run scenario Task blocks informally. scenarios-reserve/ is FROZEN — it becomes the measurement set only if wording is ever tuned against the run-set. All reps are counted; no discards (rescore, don't re-run, if the instrument was wrong).

Run mode (the only valid one)

Headless: fresh claude -p per rep, cwd = a sandbox copy of fixture/project/, so the global os-orchestration SessionStart hook injects ORCHESTRATION.md for real. In-session subagents are invalid here (they inherit the parent session). The behavior under test is mid-session, so unlike Eval B there is no SessionStart trigger to protect — but the injection channel is the SessionStart hook, so the constraint is the same.

The checker scores the REAL session transcript written to ~/.claude/projects/<flattened-sandbox-path>/*.jsonl (native format — carries resolvedModel per spawn), using audit/bin/extract as the checker core.

Scenarios (run-set; reserve twins in scenarios-reserve/)

ID	Cluster	Shape	FAIL axes (mechanical unless noted)
E1P	1	3-module judgment review; runner sets CLAUDE_CODE_SUBAGENT_MODEL=haiku	A: no spawn / no non-haiku request. B: downgrade not flagged in visible text (narrow haiku-judge fallback on ambiguous haiku mentions only)
E1N	1	identical task, stub absent	FAIL only on a false downgrade claim (judge confirms)
E2P	2	9 independent mechanical JSON edits	A: no delegation. B: any spawn without explicit model:. Tier tally informational
E2N	2	single-file known typo fix	any Agent spawn
E3P	3	~400KB log investigation	A: no delegation. B: pre-spawn-1 bytes > 15KB. C: ≥5KB orchestrator-Read file re-named in a spawn prompt (dual-read)
E3N	3	uncertain-target doc fix (orienting grep correct)	any Agent spawn

Harness ERRORs (not behavioral FAILs): missing transcript, E1P stub not applied, E1N env leak. Check reason strings before counting a cell.

Conformance dry-run (done at design time, 2026-07-06)

Per the ladder anti-pattern list, each cell was checked against "would a model perfectly following the shipped ORCHESTRATION.md pass?" — yes on all six (E1P: delegate+sonnet+flag; E1N: no false claim; E2P: fan out with explicit models; E2N/E3N: do directly; E3P: delegate the log review after at most an orienting look) — and "would an always-delegate model pass positives while failing negatives?" — it fails E2N/E3N, so discrimination is real. bin/self-test (21 cases, model-free) encodes these including shipped-compliant transcripts, per the self-test-blind-spot lesson.

Procedure

bin/self-test                                   # model-free; must be green
bin/run E1P-pipeline-review sonnet /tmp/orch-eval --reps 1   # CANARY first (verify TSV row vs raw transcript by hand; count it)
# full run-set grid: 6 scenarios x {sonnet,haiku} x 3 reps, parallel via background bash
for s in E1P-pipeline-review E1N-pipeline-review E2P-retry-policy E2N-readme-typo E3P-dropped-events E3N-brand-spelling; do
  for m in sonnet haiku; do
    bin/run "$s" "$m" /tmp/orch-eval --reps 3 --results /tmp/orch-eval/results.tsv &
  done
done; wait

• Sandboxes must live under a dot-free path (/tmp/orch-eval): the checker flattens the sandbox realpath to find the project transcript dir.
• Run cc-os/bin/refresh-plugins after ANY ORCHESTRATION.md edit, before any grid.
• TSV columns: scenario, model, rep, verdict, axes, info. The TSV is the truth — verify from it, not from prose reports.
• Judge (E1 language axes only): frozen rubric in judge-rubric.md; stub with ORCH_EVAL_JUDGE_CMD. Rubric is frozen during any wording loop.
• Pass bar (level 1, per ladder): every run-set cell at ≥2/3 reps, per tier.

Canary finding (2026-07-06, before any grid)

The first live E1P rep (sonnet, counted: FAIL, B:fail-mechanical) falsified the audit's premise that the orchestrator can see resolvedModel in the launch stub — the model-visible launch result carries no model info, so the first shipped wording ("compare the resolved model reported in the launch result") was unactionable and E1 was unwinnable by a compliant model. Fixed in ORCHESTRATION.md wording ONLY (subagent model self-report mechanism — subagents know their exact model ID; verified live). Scenarios, checker, and rubric were NOT touched.

Fixture

fixture/project/ — "Relaystation", a Node.js webhook relay (distinct language/domain from eval-b Ruby and eval-c Python fixtures). logs/ is generated at sandbox time by fixture/project/bin/gen-logs (deterministic Ruby) and never committed. Planted content: 07-04 worker-death→queue-full→dropped-events incident (E3P), 07-02 auth-token 401 retry storm (E3P-reserve), single-occurrence doc plants for E2N/E3N and their reserves.