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
68 lines
2.9 KiB
Markdown
68 lines
2.9 KiB
Markdown
# model-router
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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.
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## What it does
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| Step | Behaviour |
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|---|---|
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| 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). |
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| 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. |
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| 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. |
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| 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. |
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| Savings | `/router savings` prices every run on the model it ran on and compares it with the same tokens on Opus 5.5. |
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## Briefs
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Every dev, review and test brief carries one line:
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```
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Clone: /home/homelab/projects/goodwe/clones/<TICKET>-dev/
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```
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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`).
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## Install
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```
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/plugin marketplace add <this repo's git URL>
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/plugin install model-router@model-router
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```
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Or for development: `claude --plugin-dir /path/to/model-router`.
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## Settings (`/config`)
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| Setting | Default | Notes |
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| `testCommand` | empty | Run in the agent's clone; output goes to the verifier |
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| `testTimeoutSec` | 1800 | Wrapped in GNU `timeout --verbose`; a timeout is NOT VERIFIED |
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| `defaultBaseBranch` | `release/1.0` | After the PR lookup and the brief's own base branch |
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| `prBaseCommand` | empty | Optional command that prints the PR's base branch |
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| `maxRewrites` | 2 | Failed verdicts before handing back |
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| `safetyPatterns` | control loop, rs485, ... | Marks tasks as critical in the log |
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| `respectExplicitModel` | false | Keep a named model on agents without a role |
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| `allowFable` | false | Rewrite on Fable after Opus fails |
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| `prices` | empty | JSON price overrides, USD per MTok |
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## Commands
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- `/router`: recent decisions, verdicts and savings
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- `/router savings [Tn]`: the full savings table, or one task
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- `/router clear`: reset log, records and costs
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## Tests
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```
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claude plugin validate .
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claude plugin test .
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```
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44 tests. Every routing, verification, cost and timeout rule was also checked by breaking it on purpose (66 mutations, all caught by a test).
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## Known limits
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- Savings are an upper bound: Opus may need fewer tokens than the cheaper model did.
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- `timeout` stops the `docker` client, not the container: name the container and remove it in a `trap` in the test command.
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- An Opus rewrite is not verified; the PR review covers it.
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