addyosmani/agent-skills is a collection of reusable workflows, quality checks, commands, and other instructions that guide AI coding agents through software development. It is for developers who want agents to follow consistent engineering practices, and the catalogue entries are its packaged skills, commands, agents, plugins, instructions, and hooks.
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.
git clone --depth 1 https://github.com/addyosmani/agent-skillsWrote 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.
[](https://agentmods.dev/commands/addyosmani/agent-skills/code-simplify)<a href="https://agentmods.dev/commands/addyosmani/agent-skills/code-simplify"><img src="https://agentmods.dev/badge/commands/addyosmani/agent-skills/code-simplify/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.
<a href="https://agentmods.dev/commands/addyosmani/agent-skills/code-simplify"><img src="https://agentmods.dev/badge/commands/addyosmani/agent-skills/code-simplify.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00014 | $0.00220 |
| Opus 5.5 | $0.00006 | $0.00088 |
| Sonnet 5.5 | $0.00003 | $0.00044 |
| Haiku 4.5 | $0.00001 | $0.00022 |
Grade A, and why
code-simplify 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 1mo 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.
Copies of this mod
8 near-identical copies found in the catalogue:
- code-simplify — 100% identical, 0 lines differ
- code-simplify — 100% identical, 0 lines differ
- code-simplify — 100% identical, 0 lines differ
- code-simplify — 100% identical, 5 lines differ
- code-simplify — 100% identical, 0 lines differ
- code-simplify — 100% identical, 0 lines differ
- code-simplify — 94% identical, 2 lines differ
- code-simplify — 91% identical, 2 lines differ
What it actually says
Invoke the agent-skills:code-simplification skill.
Simplify recently changed code (or the specified scope) while preserving exact behavior:
- Read CLAUDE.md and study project conventions
- Identify the target code — recent changes unless a broader scope is specified
- Understand the code's purpose, callers, edge cases, and test coverage before touching it
- Scan for simplification opportunities:
- Deep nesting → guard clauses or extracted helpers
- Long functions → split by responsibility
- Nested ternaries → if/else or switch
- Generic names → descriptive names
- Duplicated logic → shared functions
- Dead code → remove after confirming
- Apply each simplification incrementally — run tests after each change
- Verify all tests pass, the build succeeds, and the diff is clean
If tests fail after a simplification, revert that change and reconsider. Use code-review-and-quality to review the result.
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.
- 1mo ago First seen · 23 lines · 14 tokens per session scan A 71e9e8d38c5c
code-simplify is a command published in the GitHub repository addyosmani/agent-skills (107,397 stars, last pushed 3d ago), licensed MIT. It adds 14 tokens to every session and 220 once invoked, about $0.0001 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.
Other commands, from other repositories
code-simplify
A code-review command that simplifies recently changed code or another chosen scope while preserving its behavior.
review
A command that reviews code changes across correctness, readability, architecture, security, and performance.
review
Conduct a five-axis code review — correctness, readability, architecture, security, performance.
pm-review
Review local git diff with reasoning + snippets; cross-check; dispose findings into the rules library.
ship
A command that runs several specialist checks before software is released, then combines their findings into a decision about whether to launch.
build
A command for carrying out the next unfinished coding task from a plan, including writing tests, implementing the change, checking the project, and committing it. TDD, or test-driven development, means writing a failing test before the code that makes it pass.