A code-cleanup skill that finds unnecessary complexity in the current Git diff, applies simplifications to the working files, and checks the build.

Use it after a feature works and tests pass, before opening a pull request. It reviews and edits only the current diff, then verifies that the build still works.

It removes duplicated, overbuilt, wasteful, or poorly placed code before review. It also helps catch some React, TypeScript, and project-guideline issues in the changed code.

tidy — Skill for Claude Code and Codex by mblode/agent-skills

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.

Any agent

npx skills add mblode/agent-skills --skill tidy

Clone the repo

git clone --depth 1 https://github.com/mblode/agent-skills

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/mblode/agent-skills/tidy/github.svg)](https://agentmods.dev/skills/mblode/agent-skills/tidy)

Your own site

<a href="https://agentmods.dev/skills/mblode/agent-skills/tidy"><img src="https://agentmods.dev/badge/skills/mblode/agent-skills/tidy/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/mblode/agent-skills/tidy"><img src="https://agentmods.dev/badge/skills/mblode/agent-skills/tidy.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 144 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,775 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00144	$0.03775
Opus 5.5	$0.00058	$0.01510
Sonnet 5.5	$0.00029	$0.00755
Haiku 4.5	$0.00014	$0.00378

Measured 5d ago against content hash 1fd6c54b0aab, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

tidy 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 5d 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.

skills/tidy/SKILL.md · 146 lines

How it starts

The opening of the file, as written. The whole thing — 146 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Tidy

Review the diff, then fix it when asked. One pass produces the report; the same pass, in apply mode, lands the fixes along with the simplifications a clean diff still hides.

IS: review of a local diff, branch diff, PR, or named security scope, returning severity-tiered findings with file:line evidence; in apply mode, the smallest complete fixes for those findings plus diff-scoped simplification.
IS NOT: creating PRs (pr-creator), CI failures and review threads (pr-babysitter), user-facing UX, accessibility, or rendered quality (ui-design Audit mode), library or CLI ergonomics (dx-audit), architecture briefs and repo-wide guardrails (codebase-architecture), reviewing plans (planning), suite-wide test pruning to a measured target (test-audit).

Report or apply

Report is the default: "review my changes", "code review", a mode phrase below, or a PR number. Done is the report in the format under Output, carrying the range reviewed, each baseline command's last line, and the references read. The working tree stays as it was. Do not edit a file in report mode, even for a one-character fix; the moment the tree changes the user loses the read-only report they asked for.

Apply when the user says "tidy", "simplify", "fix", "apply the findings", or asks for the changes to be made. Done is the confirmed findings and supported simplifications in the working tree, the affected checks passing or their failures shown to be baseline, and a summary of what changed, what was left and why, and the check results. Apply mode edits any file the diff touches or a fix requires, and runs the repository's documented lint, type, and test commands without asking: they run locally against the working tree, and landing the changes is what was asked for. It does not commit, push, open PRs, add or upgrade dependencies, run migrations, or write outside the working tree. A report from earlier in the session is input, not authority: apply what current evidence supports and say why anything was not applied.

Read the full file on GitHub · 146 lines

Files

What ships with it

9 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

5d ago Changed · +2 lines 1fd6c54b0aab
1mo ago Changed · +3 lines · +30 tokens per session e9da74a02bd8
1mo ago Changed acba64a4e13a
1mo ago Changed · +100 lines · +46 tokens per session 81900a246bd4
1mo ago Changed · -164 lines · -154 tokens per session 3b0940d4907b
1mo ago First seen · 205 lines · 222 tokens per session scan A 8774e9f31b52

Subscribe to this mod's changes

tidy is a skill published in the GitHub repository mblode/agent-skills (167 stars, last pushed today), licensed MIT. It adds 144 tokens to every session and 3,775 once invoked, about $0.0006 per session on Opus 5.5. 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 2026-08-30.

Claude Code Code review LLM agent-skills ai-agents anthropic developer-tools

cpp-coding-standards

C++ coding standards based on the C++ Core Guidelines (isocpp.github.io). Use when writing, reviewing, or refactoring C++ code to enforce modern, safe, and idiomatic practices.

affaan-m/ECC · 48 tokens

simplify-code

Parallel 4-agent cleanup of recent code changes.

NousResearch/hermes-agent · 14 tokens

coding-standards

Baseline cross-project coding conventions for naming, readability, immutability, and code-quality review. Use detailed frontend or backend skills for framework-specific patterns. Use when reviewing code quality or naming with no framework-specific skill that applies.

affaan-m/ECC · 50 tokens

tidy