New global plugin with one SessionStart hook running all checks in-process
(hooks/checks.py, check(ctx) -> CheckResult, single registry). Three states:
ok (silent), note (near-zero-token line, never suppressed), warn (one
aggregated banner, once-per-day snooze + permanent suppress in gitignored
per-project .cc-os/). Initial checks: subagent-model-env-override (catches
the WS1 Cluster 1 incident deterministically), adr-system-present (verbatim
port of os-adr's hook, legacy .os-adr/suppress honored), vault-hub-note-present.
os-adr's own SessionStart hook moved here atomically (its hooks.json now
empty; session_start.py stays as wording source of record). Built via
OpenSpec change add-os-status-plugin; 36 model-free tests; smoke-tested
2026-07-06 incl. env-override canary.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Five-iteration /autoresearch wording experiment against the Eval B baseline
(haiku 0/8, sonnet 5/8). Checker/fixtures/scenarios/rubric frozen; wording
surfaces: hook PRESENT_NOTE, find/create SKILL.mds, fixture CLAUDE.md
(declared a surface upfront — it is the real-project adoption template).
- Hook note + skill descriptions: when->then trigger-conditioned phrasing
(H1 confirmed, both tiers)
- find skill: explicit-unconditional reversal->supersede offer where find's
output is on screen (fixed sonnet W3)
- Mechanical lower-tier trigger: before first edit to any existing file,
run find on those paths; additions count (fixed haiku R1/R4)
- New eval-b/fixture/project/CLAUDE.md carrying the same rules
Final grid: sonnet 8/8, haiku 7/8 (W3 axis-b judge flicker). Open: channel
ablation (hook vs CLAUDE.md) not run; R4-nograph now passes both tiers.
Hypothesis->result map: vault note os-adr-eval-b-wording-experiment-hypotheses.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jared