feat(model-router): wave 2-B — orchestrators declare phases, shifters and pins removed, frontmatter = off-state floor
The 15 Skill(effort-*) citers now call mcp__model-router__route per phase (orchestrate at a dispatch span, reflect/plan for the skill's own level, apply at the bookkeeping tail, escalate at the verify-secure caps); built-in judgment dispatches carry an explicit effort= param. lib/effort-shift.md is the route doctrine, lib/model-gate.md the mod rule (route answer = witness, /route on as remedy). Deleted: skills/effort-*, lib/effort-pins.txt/.sh, lib/model-check.sh, their tests, the installers' re-apply blocks. The mod drops its Skill(effort-*) bridge. The tracked model:/effort: frontmatter stays as the off-state floor, census-locked equal to the rows (lib/tests/effort-routing.test.sh rewritten, 140 checks; analyzer → xhigh). Contract .claude/tasks/contracts/2026-10-10-model-router-w2b-1045.md, plan r4 § W2-B: GATE 0 MET, verifier ECARTS(7) then CONFORME 10/10, security PASS, full make test green (design-tool-gate env red only).
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# Model gate — reflection requires a big model (BLOCKING)
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Shared include. Runs FIRST in any orchestrator whose reflection —
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brainstorming, planning, contract, audit judgment, loop decisions —
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executes inline or in inherit-model subagents. Sonnet-pinned executors are
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not what this gate protects; it protects the thinking around them (BDR-066).
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Shared include, runs FIRST in an orchestrator whose reflection executes
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inline (BDR-066). The witness is the model-router mod's own route tool.
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## 1. Self-check
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## Entry call
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ALWAYS call `mcp__model-router__route` with `phase` = the skill's row phase
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(reflect or plan), no self-check shortcut. Tool not loaded (deferred) →
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`ToolSearch("select:mcp__model-router__route")` once per session, then
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call. The answer names the id main runs on next.
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Your system prompt names the model powering this session. Fable or Opus →
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big. Sonnet, Haiku, anything else → small.
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| answer | action |
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|---|---|
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| names a fable or opus id | proceed, SILENT |
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| names sonnet, haiku, anything else; "is off"; tool absent | **STOP** |
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## 2. Witness — deterministic check
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**STOP means**: print exactly `⛔ MODEL GATE — session on <model>.
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Reflection steps of this skill require Fable or Opus. Switch with /model,
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then relaunch the skill.` (mod off: say so, `/route on` resumes it), then
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end
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the turn. No later step runs, no agent is dispatched, nothing is edited.
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bash "$HOME/.claude/lib/model-check.sh"
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Output `<class>:<raw>`; exit 0 = big, 2 = small, 3 = unknown. The witness
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reads the PERSISTED model (settings.json — the file `/model` rewrites,
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LRN-098). It can lag reality (session launched with `--model`, settings not
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yet rewritten) — that is why the self-check exists alongside it.
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## 3. Verdict
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| self-check | witness | action |
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|---|---|---|
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| big | big (0) | proceed, SILENT — the nominal path prints nothing |
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| small | any | **STOP** |
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| big | small (2) | disagreement — **STOP**, surface BOTH values; the user confirms or relaunches |
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| 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) |
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**STOP means**: print exactly
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⛔ MODEL GATE — session on <model>. Reflection steps of this skill
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require Fable or Opus. Switch with /model, then relaunch the skill.
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then end the turn. No later step runs, no agent is dispatched, nothing is
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edited.
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## 4. Dispatch tiers (BDR-077 — no inherit)
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The gate guards the MAIN loop only. Dispatched work NEVER inherits the
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session model: typed agents run on their frontmatter pin; built-ins
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## Dispatch tiers (BDR-077 — no inherit)
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The gate guards the MAIN loop only. Typed agents are routed by their
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model-router row (`model:` frontmatter = off-state floor). Built-ins
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(general-purpose / Explore / Plan) carry an explicit `model=` at every call
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site — `model: "fable"` when the child performs reflection/orchestration on
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the main loop's behalf (skill-runners), otherwise its complexity tier
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(opus = dispatched judgment, sonnet = execution/collection, haiku = short
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mechanical probes).
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Effort is the second axis of the same table (BDR-107): every typed agent
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carries an `effort:` pin next to `model:`, and the main loop shifts per phase
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through `lib/effort-shift.md`. No typed agent inherits either axis;
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built-ins inherit the effort in force at dispatch, so an orchestrator shifts
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before dispatching them (`lib/effort-shift.md`, wiring point 5).
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site: `model: "fable"` when the child reflects/orchestrates for the main
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loop (skill-runners), else its tier (opus = dispatched judgment, sonnet =
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execution, haiku = mechanical probes). A built-in judgment dispatch also
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carries an explicit `effort=` (`lib/effort-shift.md`).
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