fettle-quality

fettle-quality is a command for coding agents from MilindGaharwar/fettle. It costs 10 tokens per session (149 once invoked), scanned A, original, Apache-2.0.

A project-quality command that runs Fettle's full scan, including checks for problems identified by its rules.

In plain words
What is it for?
Use it to scan the current project, review new findings against a baseline, apply automatic fixes, update that baseline, or run a cross-review.
Why use it?
It gathers findings in one report and groups them by severity, making quality issues easier to review and address.

Command

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

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/milindgaharwar/fettle/fettle-quality
Clone the repo
git clone --depth 1 https://github.com/MilindGaharwar/fettle

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-quality

README.md
[![agentmods](https://agentmods.dev/badge/commands/milindgaharwar/fettle/fettle-quality.svg)](https://agentmods.dev/commands/milindgaharwar/fettle/fettle-quality)
Your own site
<a href="https://agentmods.dev/commands/milindgaharwar/fettle/fettle-quality"><img src="https://agentmods.dev/badge/commands/milindgaharwar/fettle/fettle-quality.svg" alt="Measured on agentmods" height="20"></a>
Per session 10 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 149 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00010 $0.00149
Opus 5 $0.00005 $0.00075
Sonnet 5 $0.00002 $0.00030
Haiku 4.5 $0.00001 $0.00015

Measured 4d ago against content hash d83542ca5add, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fettle-quality 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 4d 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.

.opencode/commands/fettle-quality.md · 16 lines

What it actually says

$ARGUMENTS refers to any text the user typed after the slash command.

Run fettle check --all (pass any additional arguments from $ARGUMENTS).

Present the results to the user, grouped by severity. If there are errors, suggest specific fixes based on the rule messages. If a baseline is available, highlight only new findings.

After presenting results, offer to:

  1. Fix the errors automatically (if any) with fettle check --fix
  2. Update the baseline with fettle baseline update
  3. Run a cross-review with python3 -m fettle.cross_review
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. 4d ago First seen · 16 lines · 10 tokens per session scan A d83542ca5add

Subscribe to this mod's changes

fettle-quality is a command published in the GitHub repository MilindGaharwar/fettle (2 stars, last pushed yesterday), licensed Apache-2.0. It adds 10 tokens to every session and 149 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.