multi_coord_stress: fresh_workers two-tier index — fresh-resume now top-1
Runs #003-#009 surfaced the same finding: fresh workers added mid-run to the main 'workers' vectord index (5K items) reliably *absorbed* (HTTP 200) but failed to *surface* in semantic queries even with content-matching prompts. Distances on the verify queries sat at 0.25-0.65 against existing workers; fresh items were beyond top-K. Better embedder (v2-moe) didn't help — distances got TIGHTER on existing items, pushing fresh items further out of reach. Root cause: coder/hnsw incremental adds to a populated graph land in poorly-connected regions and disappear from search traversal. Known property of HNSW post-build adds; not a bug. Fix: two-tier index pattern (canonical NRT search architecture). Fresh content goes to a small "hot" corpus (fresh_workers); main queries include it in the corpora list and merge results. Hot corpus has no recall crowding because it's tiny; periodic batch job (post- G3) merges it into the main index. Implementation: - ensureFreshIndex(hc, gw, name, dim) — idempotent POST /v1/vectors/index. 409 from re-create treated as "already there." - ingestFreshWorker now takes idx parameter so callers can target fresh_workers instead of workers. - multi_coord_stress phase 1b creates fresh_workers index + ingests 3 fresh workers there + searches verifyCorpora=[workers, ethereal_workers, fresh_workers]. Run #010 result: fresh-001 (Senior tower crane rigger NCCCO Chicago) top-1: fresh-001 from fresh_workers, distance 0.143 fresh-002 (Bilingual Spanish/English OSHA trainer Indianapolis) top-1: fresh-002 from fresh_workers, distance 0.146 fresh-003 (FAA Part 107 drone surveyor Chicago) top-1: fresh-003 from fresh_workers, distance 0.129 3/3 fresh workers surface at top-1 — the absorption-but-not- findable issue from runs #003-#009 is closed. All other metrics held: diversity 0.007, determinism 1.000, verbatim handover 4/4, paraphrase handover 4/4, swap Jaccard 0.000, inbox burst all 6 events accepted + traced to Langfuse. This is the final structural fix for the multi-coord stress suite. Phase 3 is feature-complete. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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# Multi-Coordinator Stress Test — Run 010
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**Generated:** 2026-04-30T21:30:38.434794788Z
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**Coordinators:** alice / bob / carol (each with own playbook namespace: `playbook_alice` / `playbook_bob` / `playbook_carol`)
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**Contracts:** alpha_milwaukee_distribution / beta_indianapolis_manufacturing / gamma_chicago_construction
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**Corpora:** `workers,ethereal_workers`
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**K per query:** 8
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**Total events captured:** 67
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**Evidence:** `reports/reality-tests/multi_coord_stress_010.json`
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---
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## Diversity — is the system locking into scenarios or cycling?
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| Metric | Mean Jaccard | n pairs | Interpretation |
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|---|---:|---:|---|
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| Same role across different contracts | 0.007407407407407408 | 9 | Lower = more diverse (different region/cert mix → different workers) |
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| Different roles within same contract | 0.026455026455026454 | 18 | Should be near-zero (different roles = different worker pools) |
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**Healthy ranges:**
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- Same role across contracts: < 0.30 means the system is genuinely picking different workers per region/contract.
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- Different roles same contract: < 0.10 means role-specific retrieval is working.
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- If either is > 0.50, the system is "cycling" the same handful of workers regardless of query intent.
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---
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## Determinism — same query reissued, top-K stability
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| Metric | Value |
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|---|---:|
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| Mean Jaccard on retrieval-only reissue | 1 |
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| Number of reissue pairs | 12 |
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**Interpretation:**
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- ≥ 0.95: HNSW retrieval is highly deterministic; reissues land on near-identical top-K. Good — system locks into a stable view of "best workers for this query."
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- 0.80 – 0.95: Some HNSW or embed variance, acceptable.
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- < 0.80: Retrieval is unstable — reissues see substantially different results, suggesting either embed nondeterminism (Ollama returning slightly different vectors) or vectord nondeterminism (HNSW insertion order affecting recall).
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---
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## Learning — handover hit rate
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Bob takes Alice's contract using Alice's playbook namespace. Did Alice's recorded answers surface in Bob's results?
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| Metric | Value |
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|---|---:|
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| Verbatim handover queries run | 4 |
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| Alice's recorded answer at Bob's top-1 (verbatim) | 4 |
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| Alice's recorded answer in Bob's top-K (verbatim) | 4 |
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| **Verbatim handover hit rate (top-1)** | **1** |
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| Paraphrase handover queries run | 4 |
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| Alice's recorded answer at Bob's top-1 (paraphrase) | 4 |
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| Alice's recorded answer in Bob's top-K (paraphrase) | 4 |
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| **Paraphrase handover hit rate (top-1)** | **1** |
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**Interpretation:**
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- Verbatim hit rate ≈ 1.0: trivial case — Bob runs identical queries; should always hit.
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- Paraphrase hit rate ≥ 0.5: institutional memory survives wording change — the harder learning property.
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- Paraphrase hit rate ≈ 0.0: Bob's paraphrases drift past the inject threshold, so Alice's recordings don't activate. Same caveat as the playbook_lift paraphrase pass.
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---
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## Per-event capture
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All matrix.search responses live in the JSON — top-K with worker IDs, distances, and per-corpus counts. Search by phase:
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```bash
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jq '.events[] | select(.phase == "merge")' reports/reality-tests/multi_coord_stress_010.json
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jq '.events[] | select(.coordinator == "alice" and .phase == "baseline")' reports/reality-tests/multi_coord_stress_010.json
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jq '.events[] | select(.role == "warehouse worker") | {phase, contract, top_k_ids: [.top_k[].id]}' reports/reality-tests/multi_coord_stress_010.json
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```
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---
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## What's NOT in this run (Phase 1 deliberately defers)
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- **48-hour clock.** Events fire as discrete steps, not on a timeline.
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- **Email / SMS ingest.** No endpoints exist on the Go side yet.
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- **New-resume injection mid-run.** The corpus is fixed at the start.
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- **Langfuse traces.** Need Go-side wiring.
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These are Phase 2/3. The Phase 1 substrate is what the time-based runner will mount on top of.
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