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understand-diff — Change Impact Analyzer

Cross-references git diffs or PRs against your project's knowledge graph to report changed components, blast radius, and risk.

Dev & CodingIntermediate★ 83,748⑂ 7,058AI score 9/10Last updated: Sep 12, 2026

What it does

  • Collects the changed file list from git diff (or a specified PR) and locates matching nodes in .ua/knowledge-graph.json.
  • Follows 1-hop edges (imports, calls, depends_on, ...) to surface upstream callers and downstream dependencies as "affected components".
  • Reports which architectural layers are touched and scores risk from node complexity, cross-layer edges, and blast radius.
  • Verifies graph freshness by resolving the stored commit hash and inspecting committed, staged, unstaged, and untracked project changes (monorepo-safe with -- .).
  • Writes diff-overlay.json so the companion dashboard can highlight changed vs. affected nodes.

Who it's for

  • Developers and reviewers who want the blast radius of a change before starting a PR review.
  • Teams on large or monorepo codebases where "what breaks if I touch this?" is a constant question.
  • Existing Understand-Anything users who already generated a codebase knowledge graph.

Examples

  1. On a feature branch: "analyze the impact of my current changes" → changed nodes, 1-hop dependencies, layer-level risk summary.
  2. "Summarize review focus areas for PR #482" → upstream callers, downstream deps, and specific things to scrutinize.
  3. After analysis, run /understand-anything:understand-dashboard to view the diff overlay on the graph.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/Egonex-AI/Understand-Anything/HEAD/understand-anything-plugin/skills/understand-diff/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the understand-anything-plugin/skills/understand-diff folder from the GitHub repo Egonex-AI/Understand-Anything into my ~/.claude/skills/understand-diff/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/Egonex-AI/Understand-Anything.git /tmp/understand-anything && mkdir -p ~/.claude/skills && cp -r /tmp/understand-anything/understand-anything-plugin/skills/understand-diff ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal in your working directory.
  2. Clone the repo: git clone https://github.com/Egonex-AI/Understand-Anything.git
  3. Create the skills folder: mkdir -p ~/.claude/skills
  4. Copy the skill: cp -r Understand-Anything/understand-anything-plugin/skills/understand-diff ~/.claude/skills/
  5. Also copy the sibling understand skill (the graph generator) from the same plugin.
  6. In your project root, run /understand first to create .ua/knowledge-graph.json.
  7. Restart Claude Code, then invoke /understand-diff or ask it to "analyze the impact of these changes".
View source on GitHub ↗License: MIT