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---
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summary: os-adr Eval B (unprompted write-trigger & retrieval) grid results for haiku/sonnet — haiku never self-triggers the ADR system, sonnet passes 5/8 with two near-miss failures — read before designing any follow-up eval on unprompted-consultation behavior.
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tags:
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- scope/global
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- type/reference
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- project/cc-os
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- tool/os-adr
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- domain/llm-evaluation
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source: cc-os
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date: 2026-07-03
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---
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# os-adr Eval B grid results (2026-07-03)
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Eval B measures whether a model notices **on its own** that an Architecture Decision Record
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system is relevant — without being explicitly told to invoke it. Two axes per scenario: (a)
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did the model touch the ADR system unprompted (mechanical, from tool_use), (b) was the specific
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outcome correct (right ADR cited, or a new ADR actually proposed/created). See
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`cc-os/plugins/os-adr/eval-b/README.md` for full harness design (headless-only `claude -p` runs,
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so a real SessionStart hook fires — in-session Agent-tool subagents cannot validly stand in for
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this, since they don't get a fresh hook invocation against the sandbox cwd).
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## Grid (1 rep/cell)
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| Scenario | Haiku | Sonnet |
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|---|---|---|
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| W1 (persistence choice) | FAIL | **PASS** |
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| W2 (convention change) | FAIL | **PASS** |
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| W3 (reversal) | FAIL | FAIL — doesn't propose recording the decision |
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| R1 (direct conflict) | FAIL | FAIL — misses the direct-conflict retrieval |
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| R2 (distractor) | FAIL | **PASS** |
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| R3 (mid-task question) | FAIL | **PASS** |
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| R4 (graph one-hop) | FAIL | **PASS** |
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| R4-nograph (degradation check) | FAIL (expected) | FAIL (expected) |
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**Haiku: 0/8.** Never touches `os-adr:*` / `bin/adr-*` / `docs/adr/` unprompted in any
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scenario — total absence of self-triggered consultation, not a near-miss.
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**Sonnet: 5/8.** Two real misses: W3 (reversal — doesn't propose recording the decision) and R1
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(direct-conflict retrieval — doesn't catch it and cite the correct ADR).
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`R4-nograph` failing on both tiers is the **expected** result — it's a degradation check, only
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meaningful paired with an R4 PASS on the same tier (confirms the Graphify one-hop layer did
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real work). Sonnet has that pairing (R4 PASS + R4-nograph FAIL); haiku doesn't, since R4 already
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failed for haiku.
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## Observations
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- **This reads as a prompting/wording issue, not a capability gap.** Sonnet already succeeds on
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5 of 8 scenarios, and its two failures (W3, R1) are near-misses rather than blind spots —
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the model is clearly capable of the behavior when the trigger is salient enough. Haiku's
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total 0/8 plus sonnet's two-scenario gap both point toward the SKILL.md wording and/or the
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SessionStart hook note text (`plugins/os-adr/hooks/session_start.py`) not being salient
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enough as an unprompted trigger — not toward a reasoning or tool-use failure.
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- **Open question, not yet resolved:** whether in-session subagents could ever validly
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substitute for part of this measurement. Flagged as suspect given the hook-context
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requirement established for Eval B (in-session subagents inherit the parent session and never
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get a fresh SessionStart against the sandbox cwd) — worth re-examining specifically for
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scenarios where the hook note itself isn't the variable under test, but not assumed solved
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here.
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- **Next step (not started — future session):** design a follow-up eval that iterates
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SKILL.md / hook-note wording to raise the unprompted-trigger rate, using the existing
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`/autoresearch` Classic-loop discipline (checker/fixtures/scenarios/rubric frozen, only
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wording moves — see `plugins/os-adr/eval-b/README.md`). **That eval should point back at
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this note** for the baseline numbers and the prompting-issue hypothesis, so the loop has a
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concrete before/after to compare against.
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## Source
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- cc-os repo, `plugins/os-adr/eval-b/` (harness) and `plugins/os-adr/eval-b/README.md` (status)
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- Full TSV: `/tmp/adr-eval-b-grid/results.tsv` (ephemeral — not committed, per harness design)
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- Doc updates committed at cc-os `5b399d5`
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Jared Swanson