Sommelier — AI skill for Claude Code

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sommelier: automatic model routing for Claude Code (a Claude Code mod)

A **Claude Code plugin**, built on **Claude Code mods** (the mods API's `turn.step`), that picks the model and effort for each task automatically. Quick lookups go to **Claude Haiku**, well-specified changes to **Claude Sonnet**, and investigation or design to **Claude Opus**, with **TypeSafe Jev** classifying each request — saving Claude Code usage without giving up quality.

The way a sommelier picks a wine for each dish, sommelier asks [TypeSafe Jev](https://docs.typesafe.ai) (a classification API that returns probabilities) three questions about each new request — **how much reasoning it needs**, **whether it starts a new task**, and **whether it is a high-risk operation** — and maps the answer onto a configurable ladder:

Reasoning depth	Default rung	Example
L0 lookup or mechanical edit	haiku · medium	"Check the version in package.json"
L1 clear goal and approach	sonnet · medium	"Add a timezone parameter to parseDate"
L2 needs investigation or trade-offs	base (opus · medium)	"Login sometimes returns 401, find out why"
L3 unbounded, needs long deliberation	opus · high	"Design a multi-tenant permission architecture"

**Why not switch models every turn?** Each model keeps its own prompt cache, so switching models means writing the whole conversation into the cache again, which costs usage too. sommelier's rule is: **upgrade any time; downgrade only when it pays off** — on a new task, and only when the switching cost is lower than what it saves.

Quick start

claude plugin marketplace add wide3751/sommelier