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Agent skill

Git Historian

by FastLED in FastLED/FastLED

Search codebase and git history for keywords. An agent skill from FastLED/FastLED.

MITAuto-check passedDevelopment

Install Git Historian

skills CLI
$ npx skills add FastLED/FastLED --skill git-historian -a claude-code

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

GitHub CLI
$ gh skill install FastLED/FastLED git-historian --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/FastLED/FastLED.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/git-historian .claude/skills/git-historian && 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
git-historian
GitHub stars
7.5k
Used in
1 other repo
Token cost
~245 tokens
SKILL.md length
104 words
Files
1
Skills in repo
23
Repo updated
First seen
Licence
MIT

At a glance

Search codebase and git history for keywords. An agent skill from FastLED/FastLED.

  • Works in 2 steps: Working tree files (current code state) → Git history (last 10 commits' diffs)
  • Investigating code changes
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Finding where features were added

What it does

Git Historian is an agent skill from FastLED/FastLED. Search codebase and git history for keywords. Use when investigating code changes, finding where features were added, or tracking down when bugs were introduced.

Its SKILL.md is about 250 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Git workflow. It works with Git. The repository describes itself as: The FastLED library for colored LED animation on Arduino. Please direct questions/requests for help to the FastLED Reddit community: http://fastled.io/r We'd like to use github… The licence is MIT.

When your agent uses it

  • Investigating code changes
  • Finding where features were added
  • Tracking down when bugs were introduced

Example prompts

  • “/git-historian”

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

  1. Working tree files (current code state)
  2. Git history (last 10 commits' diffs)

What it can do on your machine

Read from SKILL.md and the folder at commit 8d6ed12. 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

    No scripts in the folder and no shell commands in SKILL.md.

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

  • Network

    No URLs in SKILL.md.

    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

Git Historian loads about 245 tokens when it runs. Until then it costs about 44 tokens; SKILL.md has 104 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~44
When it runs · the whole SKILL.md, loaded when a task matches
~245

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 FastLED/FastLED at commit 8d6ed12, republished under its MIT licence (© FastLED). 104 words, ~245 tokens.

Download SKILL.mdSave it as .claude/skills/git-historian/SKILL.md (or your agent's skills folder).
name
git-historian
description
Search codebase and git history for keywords. Use when investigating code changes, finding where features were added, or tracking down when bugs were introduced.
argument-hint
<keyword1> [keyword2] [...] [--paths dir1 dir2]

Search the codebase and git history for the specified keywords.

Arguments: $ARGUMENTS

This command searches both:

  1. Working tree files (current code state)
  2. Git history (last 10 commits' diffs)

Usage examples:

  • /git-historian LED strip
  • /git-historian "error handling" config
  • /git-historian memory leak --paths src tests

Extract the keywords from the arguments and call the git_historian MCP tool with those keywords. If --paths is specified, extract the paths that follow it and pass them as the paths parameter. Otherwise, pass an empty paths array to search the entire repository.

Present the results in a clear, readable format showing both current code locations and historical context.

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

Files

Just SKILL.md in .claude/skills/git-historian of FastLED/FastLED.

Open the folder on GitHubat commit 8d6ed12

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in FastLED/FastLED, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Git Historian 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.

Git Historian compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Git Historian this skillFastLED/FastLED7.5k1 repos~245Automated safety check: PassMIT
Finishing a Development Branchobra/superpowers296k5 repos~1.9kAutomated safety check: PassMIT
Code Design Rationale Investigatorcursor/plugins10k9 repos~2.6kAutomated safety check: PassNone
Contributor-First PR MergeHKUDS/OpenHarness16k1 repos~847Automated safety check: PassMIT
Migrate Internal Package into GhostTryGhost/Ghost55k—~3.8kAutomated safety check: PassMIT
Create Pull Requestcline/cline70k1 repos~1.6kAutomated safety check: PassApache-2.0

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  • Memory Audit

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    Audit embedded code for stack overflow risks, heap fragmentation, static allocation patterns, and memory leaks.

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  • Platform Port

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Works with

Categories

Questions about Git Historian

What does Git Historian do?

Search codebase and git history for keywords. An agent skill from FastLED/FastLED. Git Historian is an agent skill from FastLED/FastLED. Search codebase and git history for keywords.

When should I use Git Historian?

Git Historian fits situations like: investigating code changes; finding where features were added; tracking down when bugs were introduced.

How do I install Git Historian in Claude Code?

Run `npx skills add FastLED/FastLED --skill git-historian -a claude-code`. Or copy the skill folder (.claude/skills/git-historian in FastLED/FastLED) into .claude/skills/git-historian in your project. Claude Code loads it when a task matches its description.

How do I install Git Historian in Codex?

Run `npx skills add FastLED/FastLED --skill git-historian -a codex`. Or copy the skill folder (.claude/skills/git-historian in FastLED/FastLED) into .agents/skills/git-historian in your project. Codex loads it when a task matches its description.

Can I use Git Historian 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 FastLED/FastLED --skill git-historian -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/git-historian, .gemini/skills/git-historian, .github/skills/git-historian and .opencode/skills/git-historian in your project.

What does Git Historian need to run?

SKILL.md names no scripts, command-line tools or credentials: Git Historian is instructions for the agent only.

Does Git Historian access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Git Historian 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 Git Historian use?

Git Historian 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 Git Historian use?

About 245 tokens (SKILL.md is roughly 980 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 Git Historian?

Skills that share tags, products or a category with Git Historian: Finishing a Development Branch (obra/superpowers, 296k stars), Code Design Rationale Investigator (cursor/plugins, 10k stars), Contributor-First PR Merge (HKUDS/OpenHarness, 16k stars) and Migrate Internal Package into Ghost (TryGhost/Ghost, 55k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Git Historian?

FastLED (a GitHub organization) maintains it in FastLED/FastLED, which has 7,506 GitHub stars. The repository holds 23 skills in this directory. The repository was last updated on October 7, 2026.

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