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model-router/README.md
T
adminandClaude Opus 5.5 92bc4dc348 model-router v0.4.4
Claude Code plugin: routes subagents by how well-defined the brief is,
verifies dev work on a second model in the agent's own clone, and
estimates savings against Opus 5.5.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MdqPWvuDpbpRvDEdURoAwo
2026-11-06 23:46:30 +00:00

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# model-router
A Claude Code plugin that picks a model for every subagent, checks dev work on a second model before it reaches a PR, and estimates what that saved compared with running everything on Opus.
## What it does
| Step | Behaviour |
|---|---|
| Route | Dev agents run on **Sonnet** when the brief decides the approach (Expected / acceptance criteria), on **Opus** when the design is still open. Review and test agents keep the model they are given (Opus when none). |
| Verify | When a dev agent below Opus finishes a round, the router diffs its clone against the merge base, runs the test command in that clone, and has **Opus** judge the change. |
| On FAIL | 1st: resume the same agent with the issues. 2nd: a new agent one model up, in the same clone. After that: handed back to the manager. |
| Not verified | A test timeout, a test command that cannot run, a missing clone or merge base: reported as NOT VERIFIED, never as a FAIL. |
| Savings | `/router savings` prices every run on the model it ran on and compares it with the same tokens on Opus 5.5. |
## Briefs
Every dev, review and test brief carries one line:
```
Clone: /home/homelab/projects/goodwe/clones/<TICKET>-dev/
```
Add `(Role: dev|review|test)` when the path does not end in the role. Tickets with extra parts (`OPT-11-P4`) are fine. Name the base branch (`Base branch: release/1.0`).
## Install
```
/plugin marketplace add <this repo's git URL>
/plugin install model-router@model-router
```
Or for development: `claude --plugin-dir /path/to/model-router`.
## Settings (`/config`)
| Setting | Default | Notes |
|---|---|---|
| `testCommand` | empty | Run in the agent's clone; output goes to the verifier |
| `testTimeoutSec` | 1800 | Wrapped in GNU `timeout --verbose`; a timeout is NOT VERIFIED |
| `defaultBaseBranch` | `release/1.0` | After the PR lookup and the brief's own base branch |
| `prBaseCommand` | empty | Optional command that prints the PR's base branch |
| `maxRewrites` | 2 | Failed verdicts before handing back |
| `safetyPatterns` | control loop, rs485, ... | Marks tasks as critical in the log |
| `respectExplicitModel` | false | Keep a named model on agents without a role |
| `allowFable` | false | Rewrite on Fable after Opus fails |
| `prices` | empty | JSON price overrides, USD per MTok |
## Commands
- `/router`: recent decisions, verdicts and savings
- `/router savings [Tn]`: the full savings table, or one task
- `/router clear`: reset log, records and costs
## Tests
```
claude plugin validate .
claude plugin test .
```
44 tests. Every routing, verification, cost and timeout rule was also checked by breaking it on purpose (66 mutations, all caught by a test).
## Known limits
- Savings are an upper bound: Opus may need fewer tokens than the cheaper model did.
- `timeout` stops the `docker` client, not the container: name the container and remove it in a `trap` in the test command.
- An Opus rewrite is not verified; the PR review covers it.