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Agent skill

At Simplify

by kairyou in kairyou/agent-tools

Refactor changed code to reduce duplication, complexity, and wasted work.

MITAuto-check passedDevelopment

Install At Simplify

skills CLI
$ npx skills add kairyou/agent-tools --skill at-simplify -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install kairyou/agent-tools at-simplify --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/kairyou/agent-tools.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/workflow/at-simplify .claude/skills/at-simplify && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
at-simplify
GitHub stars
180
Token cost
~770 tokens
SKILL.md length
451 words
Files
2
Skills in repo
8
Repo updated
First seen
Licence
MIT

At a glance

Refactor changed code to reduce duplication, complexity, and wasted work.

  • Works in 3 steps: Gather the diff → Review (4 cleanup agents in parallel) → Apply the fixes
  • Working-tree changes
  • SKILL.md covers Phase 0 — Gather the diff, Phase 1 — Review (4 cleanup… and Phase 2 — Apply the fixes
  • Calls git

What it does

At Simplify is an agent skill from kairyou/agent-tools. Refactor changed code to reduce duplication, complexity, and wasted work. Use for diffs, commit ranges, PRs, paths, staged changes, or working-tree changes.

Its SKILL.md is about 770 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).

It sits in Development. It works with Git. The repository describes itself as: Reusable Agent Skills, plus integrations (statusline, provider usage, vision) that install into Codex, Claude Code, and opencode. The licence is MIT.

When your agent uses it

  • Working-tree changes

Example prompts

  • “/at-simplify”

Workflow steps

3 steps, taken from the step headings in SKILL.md.

  1. Gather the diff
  2. Review (4 cleanup agents in parallel)
  3. Apply the fixes

What it can do on your machine

Read from SKILL.md and the folder at commit acc2563. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • git

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

At Simplify loads about 770 tokens when it runs. Until then it costs about 42 tokens; SKILL.md has 451 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~42
When it runs · the whole SKILL.md, loaded when a task matches
~770

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from kairyou/agent-tools at commit acc2563, republished under its MIT licence (© kairyou). 451 words, ~770 tokens.

Download SKILL.mdSave it as .claude/skills/at-simplify/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
at-simplify
description
Refactor changed code to reduce duplication, complexity, and wasted work. Use for diffs, commit ranges, PRs, paths, staged changes, or working-tree changes.
argument-hint
[<pr|branch|path>]

Simplify

at-simplify → 4 cleanup agents in parallel → apply the fixes

You are improving the quality of the changed code, not hunting for bugs. Review it for reuse, simplification, efficiency, and altitude issues, then fix what you find. Do not look for correctness bugs — that is what at-review is for.

Phase 0 — Gather the diff

Run git diff "@{upstream}...HEAD" (or git diff main...HEAD / git diff HEAD~1 if there's no upstream) to get the unified diff under review. If there are uncommitted changes, or the range diff is empty, also run git diff HEAD and include the working-tree changes in scope — the review often runs before the commit. If a PR number, branch name, or file path was passed as an argument, review that target instead. Treat this diff as the review scope.

Phase 1 — Review (4 cleanup agents in parallel)

Launch 4 independent review agents using multi-agent capabilities, all in a single message so they run concurrently. Pass each agent the diff and one of the four angles below. Each returns its findings with file, line, a one-line summary, and the concrete cost (what is duplicated, wasted, or harder to maintain).

Reuse

Flag new code that re-implements something the codebase already has — Grep shared/utility modules and files adjacent to the change, and name the existing helper to call instead.

Simplification

Flag unnecessary complexity the diff adds: redundant or derivable state, copy-paste with slight variation, deep nesting, dead code left behind. Name the simpler form that does the same job.

Show full SKILL.md (203 more words)Show less
Efficiency

Flag wasted work the diff introduces: redundant computation or repeated I/O, independent operations run sequentially, blocking work added to startup or hot paths. Also flag long-lived objects built from closures or captured environments — they keep the entire enclosing scope alive for the object's lifetime (a memory leak when that scope holds large values); prefer a class/struct that copies only the fields it needs. Name the cheaper alternative.

Altitude

Check that each change fixes the root cause at the right depth rather than patching a symptom with a fragile bandaid. Special cases layered on shared infrastructure are a sign the fix isn't deep enough — prefer the simpler, more general change to the underlying mechanism over adding special cases, and name that change.

Phase 2 — Apply the fixes

Wait for all four agents to complete, dedup findings that point at the same line or mechanism, and fix each remaining one directly. Skip any finding whose fix would change intended behavior, require changes well outside the reviewed diff, or that you judge to be a false positive — note the skip rather than arguing with it. Finish with a brief summary of what was fixed and what was skipped (or confirm the code was already clean).

© kairyou, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in skills/workflow/at-simplify of kairyou/agent-tools.

  • SKILL.md
  • agents/openai.yaml

Open the folder on GitHubat commit acc2563

Compare with similar skills

At Simplify next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

At Simplify compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
At Simplify this skillkairyou/agent-tools180—~770Automated safety check: PassMIT
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Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT
Code Design Rationale Investigatorcursor/plugins10k9 repos~2.6kAutomated safety check: PassNone
Contributor-First PR MergeHKUDS/OpenHarness16k1 repos~847Automated safety check: PassMIT
Finishing A Development Branchfarm-fe/farm5.6k34 repos~1.8kAutomated safety check: PassMIT

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Works with

Categories

Questions about At Simplify

What does At Simplify do?

Refactor changed code to reduce duplication, complexity, and wasted work. At Simplify is an agent skill from kairyou/agent-tools. Refactor changed code to reduce duplication, complexity, and wasted work.

When should I use At Simplify?

At Simplify fits situations like: working-tree changes.

How do I install At Simplify in Claude Code?

Run `npx skills add kairyou/agent-tools --skill at-simplify -a claude-code`. Or copy the skill folder (skills/workflow/at-simplify in kairyou/agent-tools) into .claude/skills/at-simplify in your project. Claude Code loads it when a task matches its description.

How do I install At Simplify in Codex?

Run `npx skills add kairyou/agent-tools --skill at-simplify -a codex`. Or copy the skill folder (skills/workflow/at-simplify in kairyou/agent-tools) into .agents/skills/at-simplify in your project. Codex loads it when a task matches its description.

Can I use At Simplify in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add kairyou/agent-tools --skill at-simplify -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/at-simplify, .gemini/skills/at-simplify, .github/skills/at-simplify and .opencode/skills/at-simplify in your project.

What does At Simplify need to run?

Going by SKILL.md and its folder, At Simplify needs the command-line tools its instructions call (git).

Does At Simplify access the network?

SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is At Simplify safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does At Simplify use?

At Simplify is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does At Simplify use?

About 770 tokens (SKILL.md is roughly 3.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to At Simplify?

Skills that share tags, products or a category with At Simplify: Finishing a Development Branch (obra/superpowers, 297k stars), Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars), Code Design Rationale Investigator (cursor/plugins, 10k stars) and Contributor-First PR Merge (HKUDS/OpenHarness, 16k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains At Simplify?

kairyou (a GitHub user) maintains it in kairyou/agent-tools, which has 180 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on October 8, 2026.

Source: kairyou/agent-tools on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.