git-blame-summary

git-blame-summary is a skill for Claude Code, Codex from lyupro/skillforge-mcp. It costs 26 tokens per session (409 once invoked), scanned A, original, MIT.

A report of who changed a file and how recently, based on Git history. Git is a version-control system that records code changes, their authors, and commits.

In plain words
What is it for?
Finding primary code owners, recent activity, repeatedly changed areas, and the best person to consult before a substantial edit.
Why use it?
It helps identify the people most familiar with a file and whether the file is stable or frequently changing. It also points out areas that have been repeatedly revised.

Skill for Claude CodeCodex

Part of the skillforge plugin — 10 skills, 1 MCP server shipped together

Install

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.

agentmods
npx agentmods add skills/lyupro/skillforge-mcp/git-blame-summary
Any agent
npx skills add lyupro/skillforge-mcp --skill git-blame-summary
Clone the repo
git clone --depth 1 https://github.com/lyupro/skillforge-mcp

Made for: Claude Code, Codex.

Or install skillforge, the plugin that ships this one along with the rest of its 10 skills, 1 MCP server.

Wrote 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.

agentmods badge for git-blame-summary

README.md
[![agentmods](https://agentmods.dev/badge/skills/lyupro/skillforge-mcp/git-blame-summary.svg)](https://agentmods.dev/skills/lyupro/skillforge-mcp/git-blame-summary)
Your own site
<a href="https://agentmods.dev/skills/lyupro/skillforge-mcp/git-blame-summary"><img src="https://agentmods.dev/badge/skills/lyupro/skillforge-mcp/git-blame-summary.svg" alt="Measured on agentmods" height="20"></a>
Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 409 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00026 $0.00409
Opus 5 $0.00013 $0.00204
Sonnet 5 $0.00005 $0.00082
Haiku 4.5 $0.00003 $0.00041

Measured 5d ago against content hash cf5e5c24dcc7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

git-blame-summary 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 5d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/collect.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/git-blame-summary/SKILL.md · 43 lines

What it actually says

You are a code historian. The Script output section below contains the output of a curated git blame run against the target file — author + relative date + line count per author + the five most recent commits touching the file.

Your task:

  1. Identify primary owner(s) — the author(s) responsible for >40% of the lines. If no single author dominates, list the top three by line count.
  2. Identify recent activity — has the file been touched in the last 30 days? By whom? Is it a stale file, an actively churning one, or somewhere in between?
  3. Identify hot spots — if the recent-commits section shows the same area being revisited repeatedly, name it. This is a signal of unstable or under-specified code.
  4. Recommend who to consult before non-trivial changes. Be concrete — a name (or "primary owner" if anonymised), not "the team".

Output format:

## Ownership

- Primary owner: <name> (<line %>)
- Other significant contributors: <name> (<line %>), <name> (<line %>)

## Activity

<one paragraph: stale / churning / steady, last-touched-relative-date>

## Hot spots

<bullet list if any, "None evident" otherwise>

## Recommendation

<one sentence on who to consult and why>

The User input section (if non-empty) may contain a specific question — "who can review this function?", "is this file safe to refactor?", etc. Treat it as guidance for the recommendation paragraph but always include the full structured sections above.

Files

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.

Changes

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.

  1. 5d ago First seen · 43 lines · 26 tokens per session scan A cf5e5c24dcc7

Subscribe to this mod's changes

git-blame-summary is a skill published in the GitHub repository lyupro/skillforge-mcp (2 stars, last pushed 20d ago), licensed MIT. It adds 26 tokens to every session and 409 once invoked, about $0.0001 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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