fettle: Command for Claude Code

.opencode/commands/fettle-review.md

fettle-review is a command for Claude Code, OpenCode from MilindGaharwar/fettle. It costs 14 tokens per session (196 once invoked), scanned A, original, Apache-2.0.

A command that sends a file to a different language model for an independent review. It runs through the fettle.review Python module and supports Ollama, proxy, or OpenAI providers.

In plain words
What is it for?
Cross-checking critical code paths, security-sensitive changes, or complex pull requests before merging, using /fettle:review with a file path.
Why use it?
It provides a second opinion on important or complex work, which can reveal issues the original review missed.

Command for Claude CodeOpenCode

Written for Claude Code and OpenCode: shipped in a Claude Code plugin, but also installed under .opencode/.

This is MilindGaharwar/fettle's own configuration. It tells Claude Code and OpenCode how to work on fettle itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything fettle configures →

Part of the fettle plugin — 34 commands, 4 hooks shipped together

Reuse

Borrowing it

Nothing to install: this file belongs to MilindGaharwar/fettle. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/MilindGaharwar/fettle/main/.opencode/commands/fettle-review.md
Clone the repo
git clone --depth 1 https://github.com/MilindGaharwar/fettle

Made for: Claude Code, OpenCode.

Or install fettle, the plugin that ships this one along with the rest of its 34 commands, 4 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for fettle-review

README.md
[![agentmods](https://agentmods.dev/badge/commands/milindgaharwar/fettle/fettle-review.svg)](https://agentmods.dev/commands/milindgaharwar/fettle/fettle-review)
Your own site
<a href="https://agentmods.dev/commands/milindgaharwar/fettle/fettle-review"><img src="https://agentmods.dev/badge/commands/milindgaharwar/fettle/fettle-review.svg" alt="Measured on agentmods" height="20"></a>
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 196 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00014 $0.00196
Opus 5 $0.00007 $0.00098
Sonnet 5 $0.00003 $0.00039
Haiku 4.5 $0.00001 $0.00020

Measured 6d ago against content hash 1c6eb89795cd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

fettle-review scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

  • review — 86% identical, 5 lines differ
.opencode/commands/fettle-review.md · 37 lines

What it actually says

/fettle:review

Run an independent cross-review of a file using a different LLM.

Usage

When the user invokes /fettle:review:

  1. Identify the file to review (ask if not obvious from context).
  2. Run:
    python3 -m fettle.review --file PATH
    
  3. Present the review findings.

Configuration

# .fettle.toml
[review]
provider = "ollama"    # ollama | proxy | openai
endpoint = "http://localhost:11434/v1"
model = "llama3.2"

Purpose

Gets a "second opinion" from a different model. Useful for:

  • Critical code paths
  • Security-sensitive changes
  • Before merging complex PRs
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 6d ago First seen · 37 lines · 14 tokens per session scan A 1c6eb89795cd

Subscribe to this mod's changes

fettle-review is a command published in the GitHub repository MilindGaharwar/fettle (2 stars, last pushed 2d ago), licensed Apache-2.0. It adds 14 tokens to every session and 196 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.