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 evangelosmeklis/thufir --skill git-investigationgit clone --depth 1 https://github.com/evangelosmeklis/thufirWrote 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/evangelosmeklis/thufir/git-investigation)<a href="https://agentmods.dev/skills/evangelosmeklis/thufir/git-investigation"><img src="https://agentmods.dev/badge/skills/evangelosmeklis/thufir/git-investigation/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/evangelosmeklis/thufir/git-investigation"><img src="https://agentmods.dev/badge/skills/evangelosmeklis/thufir/git-investigation.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 | $0.00072 | $0.03347 |
| Opus 5 | $0.00036 | $0.01673 |
| Sonnet 5 | $0.00014 | $0.00669 |
| Haiku 4.5 | $0.00007 | $0.00335 |
Grade A, and why
Git Investigation 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 601 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Git Investigation
Overview
Git is a distributed version control system that tracks code changes over time. This skill provides guidance for using git commands to investigate code history, identify when bugs were introduced, and track down specific changes during root cause analysis.
When to Use This Skill
Apply this skill when:
- Tracing when specific code was changed
- Finding who authored problematic code
- Identifying commits that introduced bugs
- Comparing code versions before/after incidents
- Searching commit messages for clues
- Binary searching for breaking commits (bisect)
Essential Git Commands for RCA
git log - View Commit History
Basic usage:
git log
Useful flags for RCA:
Show commits with diffs:
git log -p
Show commits for specific file:
git log -- path/to/file.js
Show commits in time range:
git log --since="2025-12-19 00:00" --until="2025-12-19 23:59"
Show one-line summaries:
git log --oneline
Show commits by author:
git log --author="Developer Name"
Show commit graph:
git log --graph --oneline --all
Search commit messages:
git log --grep="database" --grep="pool" --all-match
Format output:
git log --format="%h %an %ad %s" --date=short
git blame - Find Line Authors
Basic usage:
git blame path/to/file.js
Show line ranges:
git blame -L 40,50 path/to/file.js
Show email addresses:
git blame -e path/to/file.js
Follow line history through renames:
git blame -C -C -C path/to/file.js
Show commit details:
git blame -s path/to/file.js
Blame output format:
abc123de (Developer Name 2025-12-19 10:15:00 +0000 45) max: 10,
abc123de: Commit SHADeveloper Name: Author2025-12-19 10:15:00: Timestamp45: Line numbermax: 10,: Code content
git diff - Compare Versions
What ships with it
3 files 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.
- 10d ago First seen · 601 lines · 72 tokens per session scan A f665bd61da15
Git Investigation is a skill published in the GitHub repository evangelosmeklis/thufir (7 stars, last pushed 8mo ago), licensed MIT. It adds 72 tokens to every session and 3,347 once invoked, about $0.0004 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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