strikeout

Model Router — AI skill for Claude Code

AI community

Claude Code skill: route each task to the cheapest Claude model that can do it well.

How to install Model Router

This entry records only its repository, not the path inside it, so there is no exact command to give. Open strikeout/model-router and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What Model Router does

Claude Code skill: route each task to the cheapest Claude model that can do it well.

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README

model-router

model-router is a Claude Code skill. It sends each task to the cheapest Claude model that can do the task well.

The skill does not run every task on one model. It reads two properties of a task:

Judgment load. This is the quantity of ambiguity and reasoning that the task needs.
Blast radius. This is the cost of a wrong answer.

The governing rule is "route down, escalate on evidence". The skill starts at a low tier. A failure or a complexity that you can see moves the task up by one tier.

The tiers

Tier	Claude Code `model`	Use it for
Haiku	`haiku`	Mechanical work with a clear specification and a cheap check: search, log scans, format conversion, simple extraction
Sonnet (default)	`sonnet`	Most work: features, refactors in one component, tests, drafts, standard analysis
Opus	`opus`	Hard reasoning: architecture, debugging across many files, plans with no clear specification, decisions that you cannot reverse. Opus also runs the orchestrator.
Fable	`fable`	All code reviews and security reviews, the hardest tasks, and work in biology, cybersecurity and LLM research

Each alias resolves to the newest model in its family. The `MODELS` table in `scripts/route.py` holds the API model ID of each tier.

What the repository contains

Path	Contents
`SKILL.md`	The routing policy. Claude Code reads this file when the skill starts.
`references/routing-rubric.md`	The full rubric, with worked examples and anti-patterns
`references/constraints-and-budgets.md`	Data sensitivity, context budgets, local models and the outage procedure
`references/claude-code-setup.md`	The setup of the worker subagents in Claude Code
`references/api-orchestration.md`	The integration with a custom API harness, and the Fable redirect
`assets/agents/`	Four worker subagents, one for each tier
`scripts/route.py`	A deterministic tier classifier with no dependencies