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Agent skill

Stack Split Commit

by mozilla-firefox in mozilla-firefox/firefox

Split one large or hard-to-review commit into several commits that each stand on their own for review, in a git or a Jujutsu (jj) checkout.

Custom licenceAuto-check passedDevelopment

Install Stack Split Commit

skills CLI
$ npx skills add mozilla-firefox/firefox --skill stack-split-commit -a claude-code

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

GitHub CLI
$ gh skill install mozilla-firefox/firefox stack-split-commit --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/mozilla-firefox/firefox.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/stack-split-commit .claude/skills/stack-split-commit && 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
stack-split-commit
GitHub stars
13k
Token cost
~1.3k tokens
SKILL.md length
727 words
Files
3 (incl. references)
Skills in repo
7
Repo updated
First seen
Licence
Custom licence

At a glance

Split one large or hard-to-review commit into several commits that each stand on their own for review, in a git or a Jujutsu (jj) checkout.

  • Asked to split a commit
  • SKILL.md covers Split by concern, not by "new…, A cut may need code that…, Revisit each piece's message and Review-tool side, plus 1 more section
  • Calls git
  • Break up a big diff for review

What it does

Stack Split Commit is an agent skill from mozilla-firefox/firefox. Split one large or hard-to-review commit into several commits that each stand on their own for review, in a git or a Jujutsu (jj) checkout. Use when asked to split a commit or patch, break up a big diff for review, or make a lumped commit more reviewable. One commit at a time - stack-reorganize restructures a whole stack.

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/git.md` and `references/jj.md`).

It sits in Development, covering Git workflow. It works with Git. The repository describes itself as: The official repository of Mozilla's Firefox web browser.

When your agent uses it

  • Asked to split a commit
  • Break up a big diff for review
  • Make a lumped commit more reviewable

Example prompts

  • “/stack-split-commit”

Requirements

  • Pre-approved tools (allowed-tools): Bash(git log:*), Bash(git show:*), Bash(git diff:*), Bash(git status:*), Bash(git branch:*), Bash(git checkout:*), Bash(git restore:*), Bash(git commit:*), Bash(git rebase:*), Bash(git reset:*), Bash(git apply:*), Bash(git add:*), Bash(git mv:*), Bash(jj log:*), Bash(jj show:*), Bash(jj diff:*), Bash(jj split:*), Bash(jj commit:*), Bash(jj new:*), Bash(jj describe:*), Bash(jj rebase:*), Bash(jj edit:*), Bash(jj abandon:*), Bash(jj restore:*), Bash(jj file show:*), Read, Grep, Glob

What it can do on your machine

Read from SKILL.md and the folder at commit 59c8a94. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Bash(git log:*)
    • Bash(git show:*)
    • Bash(git diff:*)
    • Bash(git status:*)
    • Bash(git branch:*)
    • Bash(git checkout:*)
    • Bash(git restore:*)
    • Bash(git commit:*)
    • Bash(git rebase:*)
    • Bash(git reset:*)

    …and 18 more on the same allowed-tools line.

    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

Stack Split Commit loads about 1.3k tokens when it runs, and up to ~3.9k if it reads all its reference files. Until then it costs about 86 tokens; SKILL.md has 727 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~86
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~3.9k

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 727 words (~1,337 tokens).

“Split without changing the final tree. Every prefix of the result has to leave the tree building, linting and passing tests, and no commit's code or comments may mention a concept that only a later commit introduces; its message may…”

— opening of SKILL.md by mozilla-firefox, Custom licence
name
stack-split-commit
allowed-tools
Bash(git log:*), Bash(git show:*), Bash(git diff:*), Bash(git status:*), Bash(git branch:*), Bash(git checkout:*), Bash(git restore:*), Bash(git commit:*), Bash(git rebase:*), Bash(git reset:*), Bash(git apply:*), Bash(git add:*), Bash(git mv:*), Bash(jj log:*), Bash(jj show:*), Bash(jj diff:*), Bash(jj split:*), Bash(jj commit:*), Bash(jj new:*), Bash(jj describe:*), Bash(jj rebase:*), Bash(jj edit:*), Bash(jj abandon:*), Bash(jj restore:*), Bash(jj file show:*), Read, Grep, Glob

Read the full SKILL.md on GitHub

Files

SKILL.md and 2 other files (references) in .agents/skills/stack-split-commit of mozilla-firefox/firefox.

  • SKILL.md
  • references/git.md
  • references/jj.md

Open the folder on GitHubat commit 59c8a94

Compare with similar skills

Stack Split Commit 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.

Stack Split Commit compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Stack Split Commit this skillmozilla-firefox/firefox13k—~1.3kAutomated safety check: PassCustom licence
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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More from mozilla-firefox/firefox

  • Stack Reorganize

    mozilla-firefox/firefox

    Reorganize a range of local commits so each one stands on its own for review, by splitting, reordering, squashing or dropping them.

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  • Perf Regression Triage

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  • Profile Capture

    mozilla-firefox/firefox

    Record a Firefox performance profile with the firefox-devtools MCP.

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  • Nimbus Prefs

    mozilla-firefox/firefox

    A skill your agent uses when a Firefox preference has to be remotely controllable: putting a new feature behind a pref so it can be experimented on, rolled out gradually, or disabled remotely via…

    13k GitHub stars~6k tokensUpdated today
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  • Firefox Commits

    mozilla-firefox/firefox

    Guidelines to follow when committing, or amending commits. An agent skill from mozilla-firefox/firefox.

    13k GitHub stars~999 tokensUpdated today
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  • JS Review

    mozilla-firefox/firefox

    A skill your agent uses when reviewing code the JS engine (SpiderMonkey, js/src/) or self-reviewing code while producing it.

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Works with

Categories

Questions about Stack Split Commit

What does Stack Split Commit do?

Split one large or hard-to-review commit into several commits that each stand on their own for review, in a git or a Jujutsu (jj) checkout. Stack Split Commit is an agent skill from mozilla-firefox/firefox. Split one large or hard-to-review commit into several commits that each stand on their own for review, in a git or a Jujutsu (jj) checkout.

When should I use Stack Split Commit?

Stack Split Commit fits situations like: asked to split a commit; break up a big diff for review; make a lumped commit more reviewable.

How do I install Stack Split Commit in Claude Code?

Run `npx skills add mozilla-firefox/firefox --skill stack-split-commit -a claude-code`. Or copy the skill folder (.agents/skills/stack-split-commit in mozilla-firefox/firefox) into .claude/skills/stack-split-commit in your project. Claude Code loads it when a task matches its description.

How do I install Stack Split Commit in Codex?

Run `npx skills add mozilla-firefox/firefox --skill stack-split-commit -a codex`. Or copy the skill folder (.agents/skills/stack-split-commit in mozilla-firefox/firefox) into .agents/skills/stack-split-commit in your project. Codex loads it when a task matches its description.

Can I use Stack Split Commit 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 mozilla-firefox/firefox --skill stack-split-commit -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/stack-split-commit, .gemini/skills/stack-split-commit, .github/skills/stack-split-commit and .opencode/skills/stack-split-commit in your project.

What does Stack Split Commit need to run?

Going by SKILL.md and its folder, Stack Split Commit needs the command-line tools its instructions call (git). Its frontmatter pre-approves these tools: Bash(git log:*), Bash(git show:*), Bash(git diff:*), Bash(git status:*), Bash(git branch:*), Bash(git checkout:*), Bash(git restore:*), Bash(git commit:*), Bash(git rebase:*), Bash(git reset:*), Bash(git apply:*), Bash(git add:*), Bash(git mv:*), Bash(jj log:*), Bash(jj show:*), Bash(jj diff:*), Bash(jj split:*), Bash(jj commit:*), Bash(jj new:*), Bash(jj describe:*), Bash(jj rebase:*), Bash(jj edit:*), Bash(jj abandon:*), Bash(jj restore:*), Bash(jj file show:*), Read, Grep, Glob.

Does Stack Split Commit 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 Stack Split Commit 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 Stack Split Commit use?

Stack Split Commit has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Stack Split Commit use?

About 1.3k tokens (SKILL.md is roughly 5.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 2.6k tokens, read only when the agent opens those files.

What are the alternatives to Stack Split Commit?

Skills that share tags, products or a category with Stack Split Commit: 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 Stack Split Commit?

mozilla-firefox (a GitHub organization) maintains it in mozilla-firefox/firefox, which has 13,384 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on October 8, 2026.

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