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# CONTRACT — model-router-w2a
- date: 2026-10-09 | flow: feat | branch: feature/model-router-w2 (to start off develop)
- status: active
- wave: W2-A (mod, plan r2). W2-B (repo migration + docs/registries as its STEP 6/7) gets its own contract after the live probe.
## REQUEST (verbatim — IMMUTABLE)
tu peux lancer la vague 2
(TODO W2 line: 15 skills `Skill(effort-*)` → `route` tool calls; remove `skills/effort-*`, `lib/effort-pins.txt/.sh`, install/update steps, `effort:` frontmatter on skills and agents; repo agents into the mod's `agents` table (verify the spawn/first-step ordering first); `lib/model-gate.md` + `lib/model-check.sh` → mod rule; census tests repointed; `lib/effort-shift.md` rewritten; docs)
## CLARIFICATIONS
(pass A: none — outcome, scope and constraints come from the TODO W2 line + plan `2026-10-08-model-router-mod.md` § Wave 2)
Q: keep the five `effort-*` skills as typed floor levers? / A: "supprimer, j'utilise les commandes builtin si j'ai besoin" → deleted; the mod drops its `Skill(effort-*)` bridge and typed-slash floor code; `ultrathink` floor stays [gated 2026-10-09]
Q: table rows = bare level next to phases, or phases only? / A: "le pin était là car pas encore de système de routage fiable; maintenant qu'il y en a un, soit on le supprime, soit tu les remanies pour que ça fonctionne encore mieux" → reworked: rows are PHASES by role (plan/reflect/implement/write/verify/judge/mechanical), no level rows; agents routed on both axes by the mod while on (model written at spawn from the phase tier, upward only); the tracked `model:`/`effort:` frontmatter STAYS as the census-locked off-state floor (plan r3, confirmation 1/8) [gated 2026-10-09]
Q: orchestrators declare phases or effort only? / A: phases [gated 2026-10-09]
Q: (mid-run, feater NEED-DECISION, CLASS internal) a skill WITHOUT a row loaded INSIDE a sub-agent: keep the old reset of that loop's effort, or leave the loop untouched like main (A5)? / A: leave the agent loop untouched too — one rule for both loops, an unrowed helper skill (find-docs) never wipes an agent row's effort [gated 2026-10-09]
Q: GATE 1 cap (3 × ECARTS on test coverage of criterion 3 clauses, code correct ×3; last rows landed by a feater, unverified) / A: user "Accepter et commiter W2-A" — accepted on the three reports + 88-test kit suite; diagnosis: compound coverage criterion, not the code [gated 2026-10-09]
Q: model gate fate? / A: slim include (self-check + STOP when the mod could not raise), `lib/model-check.sh` + test deleted [gated 2026-10-09]
## ACCEPTANCE CRITERIA
1. The mod's kit suite is green, including the new tests of criteria 3-5.
CHECK: cd mods/model-router && out="$(claude plugin test . 2>&1)" && printf '%s\n' "$out" | grep -qE '[0-9]+ pass' && printf '%s\n' "$out" | grep -qE '(^|[^0-9])0 fail' && ! printf '%s\n' "$out" | grep -qE '[1-9][0-9]* fail' && echo W2A-TESTS-GREEN
EXPECT: W2A-TESTS-GREEN
EVIDENCE: MET exit=0 marker-found :: W2A-TESTS-GREEN
2. `DEFAULT_CONFIG.phases` has `write` at work/high and a new `apply` at work/low; `DEFAULT_CONFIG.skills` and `.agents` carry exactly the phase rows of plan r2 § Row tables (56 skill rows, 21 agent rows + Explore/Plan), every value a phase key; the "Built-ins only" comment is gone.
CHECK: bash .claude/tasks/contracts/w2a-table-census.sh mods/model-router/hooks/register.ts
EXPECT: W2A-TABLE-COMPLETE
EVIDENCE: MET exit=0 marker-found :: W2A-TABLE-COMPLETE
3. A user-typed slash of a rowed skill routes main to its row (name-bound marker from `prompt.submit`, origins composer|sdk|bridge, pending slot mid-turn, or no live/spawning sub-agent); a preload inside a live sub-agent without the marker leaves main; a skill WITHOUT a row leaves the route in force; a best-tier skill row lives in a separate `runMain` slot that survives `turn.complete` and later `route` calls, and is dropped by `/route clear`, `/route off`, a user-typed non-best rowed skill, or a user `/model`; the `Skill(effort-*)` bridge is not sticky. Covered by kit tests.
4. Any rowed agent spawn (whatever `provider.plugin`) with `e.model` undefined gets the row's model written at spawn: full id resolved within the tier only and ranked ≥ the tier head (upward only); otherwise no write + one deduped log line; the row's effort applies on its loop from its first step unless the call carried `effort`; `fork`/`workflow` spawns and agents whose `agent.offer` source is a project definition are untouched; an override `agents: { name: null }` drops a row; the `route` tool answer always names the id the next main step runs on. Covered by kit tests.
5. Typed-floor code removed: no `slashEffort`, `guardedSlash`, `'slash'` Source, `typed /effort-` floor word in `register.ts`; `EFFORT_SKILL`/`effortBridge` (tool.call bridge) and the `ultrathink` floor kept until W2-B; `/route` unchanged (existing tests still green).
CHECK: ! grep -qE "slashEffort|guardedSlash|'slash'|typed /effort-" mods/model-router/hooks/register.ts && grep -q 'turnFloor' mods/model-router/hooks/register.ts && grep -q 'effortBridge' mods/model-router/hooks/register.ts && echo W2A-DEAD-CODE-GONE
EXPECT: W2A-DEAD-CODE-GONE
EVIDENCE: MET exit=0 marker-found :: W2A-DEAD-CODE-GONE
7. `claude plugin validate` passes.
CHECK: cd mods/model-router && claude plugin validate . 2>&1 | grep -qi 'valid' && echo W2A-VALID
EXPECT: W2A-VALID
EVIDENCE: MET exit=0 marker-found :: W2A-VALID
6. `make test suite=lib/tests/mods.test.sh` green.
CHECK: make test suite=lib/tests/mods.test.sh 2>&1 | tail -5 | grep -q 'mods' && ! make test suite=lib/tests/mods.test.sh 2>&1 | grep -q '^FAIL' && echo W2A-MODS-SUITE
EXPECT: W2A-MODS-SUITE
EVIDENCE: MET exit=0 marker-found :: W2A-MODS-SUITE
## FILE SCOPE
mods/model-router/hooks/register.ts, mods/model-router/hooks/register.test.ts, .claude/tasks/contracts/w2a-table-census.sh (oracle, written by the orchestrator)