chore(tasks): model-router w1a contract + plan r3
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bchanot
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# CONTRACT — model-router-w1a (wave 1-A: the mod itself)
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- date: 2026-10-08 | flow: feat | branch: feature/model-router-mod
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- status: active
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## REQUEST (verbatim — IMMUTABLE)
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Skill args: "model-router mod, wave 1-A: the mod itself under mods/model-router/ (plugin.json, hooks.json, register.ts, config.json alias→id + phases/agents/skills/prompt tables, register.test.ts); spike code in ~/.claude/dev-mods/385f7190-70f5-4bdd-b0d8-e4566cd412fd/model-router/ is the base; plan .claude/tasks/plans/2026-10-08-model-router-mod.md W1.1-W1.9"
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User (fr, same session): "go pour le registre et go sur la vague 1". Earlier framing (verbatim excerpts): "repartir correctement chaque tache au model qui lui correspond […] Il faut que l'effort aussi soit en consequence […] plus propre, plus unifier et plus automatique (meme dans la discussion courante ou d'un agent on puisse switch d'un model / effort a un autre. Et le mieux que ca soit configurable et qu'on puisse l'installer et qu'il soit actif sur toutes les session en userscope"; "Il faut un pin pour le global, mais toutes les sous taches fait pas le routage donne au model correspondant"; "si la route modifie deja les efforts, alors les skills pour changer les efforts devienne inutile mais vont quand meme etre trigger. Ca fait doublon, des token pour rien used, et peut etre meme des conflits non ?"
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## CLARIFICATIONS
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Q: config.json as a 5th file? / A: no — defaults live in register.ts (`DEFAULT_CONFIG`), the optional user override is `~/.claude/model-router.json` (deep-merged); `claude plugin test` runs without fs, so the mod must work with no file at all. 4 files. [orchestrator — internal, derived from the test sandbox]
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Q: userConfig (W1.8) / A: dropped for 1-A — `mainModelSwitch`, `verbose`, `spinner` are keys of the same config (one source), toggled live by `/route`. [orchestrator — internal]
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Q: model ids / A: hooks always write FULL ids from `config.models` (alias → id); the Agent tool param is never rewritten (its schema accepts aliases only, and the hook-side alias resolver is stale, LRN-203 / BLK-029). [orchestrator — in-force learning]
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Q: precedence / A: user `/route` (sticky until `/route clear`) > the latest turn-scoped route on main (model `route` tool, a skill load's table phase or a `Skill(effort-*)` shift, a typed `/effort-*`, a prompt rule: one slot, last writer wins; a non-effort skill load resets the slot except a prompt rule) > session settings. Explicit Agent-call `model`/`effort` params always win for that agent, for its whole run: an in-agent `route` call or `Skill(effort-*)` never touches an axis given explicitly. [orchestrator — derived from the user's "pin = entry default, sub-tasks route finer"; r3 after the confirmation challenge]
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Q: verbose default / A: `verbose: false` in DEFAULT_CONFIG; for now the user wants it ON to watch the routing → after the build the orchestrator writes `~/.claude/model-router.json` with `{"verbose": true}` (user-home file, outside FILE SCOPE). [gated 2026-10-08]
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Q: spinner suffix default / A: on (`spinner: true`). [gated 2026-10-08]
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Q: `/route` typed by the user / A: sticky until `/route clear`, wins over model-declared routes. [gated 2026-10-08]
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Q: Explore built-in / A: `explore` phase = sonnet / medium (supersedes the BDR-066 wave-3 inherit for Explore). [gated 2026-10-08]
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Q: legacy `Skill(effort-*)` / A: answered by the mod without loading the skill (single writer, no pairing rule); `/effort-*` typed by the user → `skill.prompt` sets the same route and returns a one-line text. [user 2026-10-08: "doublon … conflits"]
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## ACCEPTANCE CRITERIA
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1. `mods/model-router/` holds exactly `.claude-plugin/plugin.json`, `hooks/hooks.json`, `hooks/register.ts`, `hooks/register.test.ts` (the engine-laid `.claude-plugin/types/` folder and `./tsconfig.json` are ignored, never committed); `claude plugin validate` passes with no warning.
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CHECK: cd mods/model-router && [ "$(find . -type f | grep -v '/.claude-plugin/types/' | grep -v '^./tsconfig.json$' | sort | tr '\n' ' ')" = "./.claude-plugin/plugin.json ./hooks/hooks.json ./hooks/register.test.ts ./hooks/register.ts " ] && out=$(claude plugin validate . 2>&1) && echo "$out" | grep -q 'Validation passed' && ! echo "$out" | grep -qi 'warning' && echo FILES-VALIDATE-OK
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EXPECT: FILES-VALIDATE-OK
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EVIDENCE: MET exit=0 marker-found :: FILES-VALIDATE-OK
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2. Type-check clean against this build's declarations (the engine-laid copy beside the spike mod).
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CHECK: T=/Users/b.chanot/.claude/dev-mods/385f7190-70f5-4bdd-b0d8-e4566cd412fd/model-router/.claude-plugin/types; W=$(mktemp -d) && printf '{"compilerOptions":{"target":"es2023","lib":["es2023"],"types":[],"module":"esnext","moduleResolution":"bundler","strict":true,"noUncheckedIndexedAccess":true,"noEmit":true,"skipLibCheck":true,"jsx":"react","jsxFactory":"h","jsxFragmentFactory":"Fragment"},"include":["%s/claude-code/index.d.ts","%s/claude-code-tools/index.d.ts","%s/hooks"]}' "$T" "$T" "$PWD/mods/model-router" > "$W/tsconfig.json" && (cd "$W" && npx --yes -p typescript@5 tsc -p tsconfig.json) && echo TSC-OK
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EXPECT: TSC-OK
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EVIDENCE: MET exit=0 marker-found :: TSC-OK
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3. `claude plugin test mods/model-router` passes; the suite covers: (a) `Skill(effort-low)` via `$.tool.call` is answered without `next` in the Skill tool's output shape (`success`, `commandName`) and the route shows `low` on main; (b) the `route` tool with `phase: "orchestrate"` sets `medium` on main and `/route show` prints it; (c) `/route clear` drops it; (d) `/route bogus` returns an error text naming the phases; (e) a `prompt.submit` text holding `ultrathink` sets `escalate` on main; (f) `/route model=sonnet` shows `claude-sonnet-5-5`, a full id passes through, a misspelt alias is refused; (g) `agent.spawn` of `Explore` without a model param reaches the bottom with `model === 'claude-sonnet-5-5'`, and with `model: 'opus'` given the param is untouched.
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CHECK: cd mods/model-router && out=$(claude plugin test . 2>&1); rc=$?; echo "$out" | tail -n 5; [ $rc -eq 0 ] && [ "$(grep -cE '^\s*test\(' hooks/register.test.ts)" -ge 7 ] && echo PLUGIN-TEST-OK
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EXPECT: PLUGIN-TEST-OK
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EVIDENCE: MET exit=0 marker-found :: (pass) a tabled agent steps at its table effort [19.75ms] 11 pass 0 fail Ran 11 tests across 1 file. [0.47s] PLUGIN-TEST-OK
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4. Hooks present, as `claude plugin validate` lists them: `session.start`, `command.run{command=route}`, `tool.call{tool=mcp__model-router__route}`, `tool.call{tool=Skill}`, `tool.call{tool=Agent}`, `skill.prompt`, `agent.spawn`, `turn.step`, `prompt.submit`, `turn.complete`, `ui.render{component=Spinner}`; every gating hook carries a fail-open `.catch` (validate prints no "gating hook without .catch").
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CHECK: cd mods/model-router && out=$(claude plugin validate . 2>&1) && for h in session.start 'command.run{command=route}' 'tool.call{tool=mcp__model-router__route}' 'tool.call{tool=Skill}' 'tool.call{tool=Agent}' skill.prompt agent.spawn turn.step prompt.submit turn.complete 'ui.render{component=Spinner}'; do echo "$out" | grep -qF -- "$h" || { echo "missing $h"; exit 1; }; done && ! echo "$out" | grep -q 'without .catch' && echo HOOKS-OK
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EXPECT: HOOKS-OK
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EVIDENCE: MET exit=0 marker-found :: HOOKS-OK
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5. Code style: no line over 80 chars, no `any` type, no `import()`; `register.ts` imports only from `claude-code` and its own plugin files.
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CHECK: cd mods/model-router/hooks && ! grep -nE '.{81,}' register.ts register.test.ts && ! grep -nE ':\s*any\b|<any>|as any\b' register.ts && ! grep -q 'import(' register.ts && [ "$(grep -cE "^import .* from '(claude-code|\./)" register.ts)" -eq "$(grep -c '^import ' register.ts)" ] && echo STYLE-OK
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EXPECT: STYLE-OK
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EVIDENCE: MET exit=0 marker-found :: STYLE-OK
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6. Judged by reading: the mod never writes a model alias into a request (every `model` it sets at `agent.spawn` or `turn.step` passes through `resolveModel`); the Agent tool's `model`/`effort` params are never rewritten and an explicit `model` param is never overridden at spawn or at any step; an agent's model is written once, at spawn (a per-step model rewrite happens only after an in-agent `route` call and only while `e.model` still equals the spawn model); a fork (`e.fork`) and a workflow agent (`e.workflow`) are never re-modelled; every write from a sub-agent's Skill or `route` call lands on that agent's loop, never on main; main-loop model changes happen only when `mainModelSwitch` is true; a `.catch` on every gating hook fails open (pass-through or an in-place answer) so a mod failure never blocks a call; all state lives in the `register` closure and the defaults constant is never mutated; no function over 25 logic lines; the spike's `via` / `stepModel` / `agentsDefault` levers and the tool's `model` / `scope` params are gone.
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Q (r2): `scope: agents` / `/route agents` / A: dropped (challenge r1, no requirement behind it; per-call Agent params and the table cover it). The route tool takes `phase`, `effort`, `clear` only. [orchestrator — simplicity]
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Q (r2): agents table in wave 1 / A: built-ins only (Explore, Plan), matched for the engine provider; repo agents keep their frontmatter as the single writer until wave 2. [orchestrator — single source of truth]
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Q (r2): `/route off` / A: added as the session kill switch (every hook passes through). [orchestrator — robustness]
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## FILE SCOPE
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mods/model-router/.claude-plugin/plugin.json · mods/model-router/hooks/hooks.json · mods/model-router/hooks/register.ts · mods/model-router/hooks/register.test.ts
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