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.
npx skills add gspencergoog/skills --skill branch-cleanupgit clone --depth 1 https://github.com/gspencergoog/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/skills/gspencergoog/skills/branch-cleanup)<a href="https://agentmods.dev/skills/gspencergoog/skills/branch-cleanup"><img src="https://agentmods.dev/badge/skills/gspencergoog/skills/branch-cleanup/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/skills/gspencergoog/skills/branch-cleanup"><img src="https://agentmods.dev/badge/skills/gspencergoog/skills/branch-cleanup.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 | $0.00054 | $0.00410 |
| Opus 5 | $0.00027 | $0.00205 |
| Sonnet 5 | $0.00011 | $0.00082 |
| Haiku 4.5 | $0.00005 | $0.00041 |
Grade A, and why
branch-cleanup 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 2d 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.
What it actually says
Git Branch Cleanup Skill
This skill provides a helper script to identify and delete merged git branches. It handles both standard merges and squash merges (using git cherry analysis), and safely deletes matching tracking branches from their respective remotes (e.g. origin).
Core Features
- Squash-Merge Detection: Uses
git cherryto check if a branch's changes exist in the main branch, even if the commit history was squashed. - Worktree Cleanup: Automatically detects and deletes linked git worktrees associated with merged branches before deleting the branches.
- Safety First: Prevents removing the main worktree, and protects uncommitted work by aborting if a linked worktree has uncommitted changes.
- Remote Deletion: Automatically identifies and deletes the corresponding remote tracking branch (e.g.
origin/my-branch) using branch tracking config, avoiding coincidental name matches. - Dry-Run by Default: Safe exploration of branches before executing any deletion commands.
Usage
Run the bundled script in dry-run mode to preview changes:
python3 scripts/cleanup_branches.py --repo-dir /path/to/repo
To execute the deletions:
python3 scripts/cleanup_branches.py --repo-dir /path/to/repo --delete
Options:
--repo-dir <path>: Path to the target git repository (defaults to the current working directory).--main-branch <name>: Name of the main/production branch to check against (defaults tomain).--delete: Executes the deletion of both local and tracking remote branches.
What ships with it
1 file 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.
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.
- 2d ago Changed · +2 lines 553043df16dc
- 11d ago First seen · 35 lines · 54 tokens per session scan A 01a9e9e93415
branch-cleanup is a skill published in the GitHub repository gspencergoog/skills (2 stars, last pushed today), licensed Apache-2.0. It adds 54 tokens to every session and 410 once invoked, about $0.0003 per session on Opus 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 2026-08-31.
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A routing guide for Comet-related GitHub work. It directs requests about pull requests, issues, CI failures, ideas, and fixes to the appropriate review or implementation process.
github-skill
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Generates structured changelogs and release notes from git history and PRs, classifying breaking changes, features, fixes, performance, docs. Triggers on: "generate changelog", "write release notes", "what changed since", "prepare release", "release notes for", "diff since tag".
re0-merge
Review and land an external contribution the way this suite does: gate it against the thesis, land it with the author's credit intact, complete a new skill rather than merging it raw, then approve, credit, and explain before closing. Use when reviewing a pull request, as any collaborator or maintainer, not only the…