ase-meta-diff

A tool that summarizes staged Git changes, grouping them by the reason for the change. Git is a version-control system, and staged changes are edits selected for the next commit.

In plain words
What is it for?
Use it to prepare a concise change report and optionally check whether the edits fit their intended purpose and likely impact.
Why use it?
It makes a large or scattered change set easier to understand than a file-by-file diff.

Skill for Claude CodeCodex

View the source file rse/ase
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/rse/ase/ase-meta-diff
Any agent
npx skills add rse/ase --skill ase-meta-diff
Clone the repo
git clone --depth 1 https://github.com/rse/ase

Made for: Claude Code, Codex.

Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,052 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 $0.00057 $0.04052
Opus 5 $0.00028 $0.02026
Sonnet 5 $0.00011 $0.00810
Haiku 4.5 $0.00006 $0.00405

Measured 2d ago against content hash 93ca42b6e367, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ase-meta-diff 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.

plugin/skills/ase-meta-diff/SKILL.md · 381 lines

How it starts

The opening of the file, as written. The whole thing — 381 lines — stays where its author put it; the contents beside it link to each section on GitHub.

@${CLAUDE_SKILL_DIR}/../../meta/ase-control.md @${CLAUDE_SKILL_DIR}/../../meta/ase-skill.md @${CLAUDE_SKILL_DIR}/../../meta/ase-getopt.md

$ARGUMENTS

Procedure

    1. Determine the diff details by running the corresponding command (taken exactly as given) and capturing the full diff output into for the subsequent analysis:

      git diff --cached

    2. Determine the diff statistics by running the corresponding command (taken exactly as given) and capturing the full stat output into for the subsequent analysis:

      git diff --cached --numstat

    1. Analyze the and and synthesize a concise narrative of WHAT changed and WHY, grouped by intent rather than by file. Honor the following intents:

      • FEATURE: new functionality or configuration
      • IMPROVEMENT: improved functionality or configuration
      • BUGFIX: corrected functionality or configuration
      • UPDATE: updated functionality or configuration
      • CLEANUP: cleaned up functionality or configuration
      • REFACTOR: refactored functionality or configuration
    2. <template>
      
      <ase-tpl-bullet-normal/> **CHANGE INTENT REPORT**:
      
      </template>
      

      2. Render a three-column table with one row per discovered intent group present in the . Output the following table header :

      <template>
      | Intent | Changes (LoC) | Files &amp; Description |
      | ------ | ------------- | ----------------------- |
      </template>
      

      3. For each discovered intent group, emit the following row , where is the intent label, is the total number of lines changed per intent group in format +N/-M, is the list of affected file references, and is a brief one-to-two-sentence narrative of what changed and why:

      <template>
      | **<intent/>** | <changes/> | <files/>: <description/> |
      </template>
      
      In the <files/> part of the second column, mark up all file
      references as code (with backticks), prepend them with `▢ `,
      append ` [+N/-M]` (based on the information in <stat/>) to them,
      and separate them with `, ` (a comma and space). Do *not* repeat
      file references in the <description/>.
      
      Keep the overall report *concise* and *brief*. Try to keep the
      number of intent groups (table rows) in the range of 1-10. Do
      *not* output any further explanation.
      
    3. The project source artifacts are classified as a black box, so the user does not want the staged changes scrutinized or their coherence, risk, and blast-radius findings surfaced. The requested scrutiny of STEP 3 through STEP 5 is therefore suppressed: only output the following and then SKIP the remaining steps STEP 3 through STEP 5:

Read the full file on GitHub · 381 lines

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. 2d ago First seen · 381 lines · 57 tokens per session scan A 93ca42b6e367

Subscribe to this mod's changes

ase-meta-diff is a skill published in the GitHub repository rse/ase (47 stars, last pushed 5d ago), licensed Apache-2.0. It adds 57 tokens to every session and 4,052 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 2026-08-30.