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Bastien Chanot 3f7c754239 feat(routing): W1 no-inherit — fable skill-runners, opus review dispatches, dispatch-tier doctrine (BDR-077)

No dispatched agent inherits the session model anymore:
- client-handover-writer's 7 general-purpose skill-runner dispatch sites
  carry model: "fable" (+ normative rule; spike-verified alias — resolves
  claude-fable-5, enum-validated, loud failure, never silent fallback)
- ship-feature STEP 6 + init-project STEP 10 code-review dispatches carry
  model: "opus" (was: inherit — the leak the maps exposed)
- model-gate.md §4: dispatch-tier doctrine (typed = frontmatter pin,
  built-ins = explicit model= at every call site)
- census §12 (66 pass), make test green

2026-07-19 19:51:06 +02:00

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Model gate — reflection requires a big model (BLOCKING)

Shared include. Runs FIRST in any orchestrator whose reflection — brainstorming, planning, contract, audit judgment, loop decisions — executes inline or in inherit-model subagents. Sonnet-pinned executors are not what this gate protects; it protects the thinking around them (BDR-066).

1. Self-check

Your system prompt names the model powering this session. Fable or Opus → big. Sonnet, Haiku, anything else → small.

2. Witness — deterministic check

bash "$HOME/.claude/lib/model-check.sh"

Output <class>:<raw>; exit 0 = big, 2 = small, 3 = unknown. The witness reads the PERSISTED model (settings.json — the file /model rewrites, LRN-098). It can lag reality (session launched with --model, settings not yet rewritten) — that is why the self-check exists alongside it.

3. Verdict

self-check	witness	action
big	big (0)	proceed, SILENT — the nominal path prints nothing
small	any	STOP
big	small (2)	disagreement — STOP, surface BOTH values; the user confirms or relaunches
big	unknown (3)	fail-visible: print `model gate: witness unknown (<raw>) — self-check says <model>` and ask the user to confirm before continuing (BDR-025: unknown never silently passes)

STOP means: print exactly

⛔ MODEL GATE — session on <model>. Reflection steps of this skill
require Fable or Opus. Switch with /model, then relaunch the skill.

then end the turn. No later step runs, no agent is dispatched, nothing is edited.

4. Dispatch tiers (BDR-077 — no inherit)

The gate guards the MAIN loop only. Dispatched work NEVER inherits the session model: typed agents run on their frontmatter pin; built-ins (general-purpose / Explore / Plan) carry an explicit model= at every call site — model: "fable" when the child performs reflection/orchestration on the main loop's behalf (skill-runners), otherwise its complexity tier (opus = dispatched judgment, sonnet = execution/collection, haiku = short mechanical probes).

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