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PR Lens — Animated Diagrams for Code Changes

Turns a diff or codebase into animated SVG architecture and data-flow diagrams and attaches them to your pull request.

Dev & CodingIntermediate★ 202⑂ 7AI score 9/10Last updated: Sep 3, 2026

What it does

  • Reads the change with git diff --find-renames <base>...<head> (merge base, not branch tip) and authors a graph document at .pr-lens/graph.json with lanes, nodes, edges and ordered flows.
  • Validates via npx @coldtea/pr-lens-cli validate, documenting the four failure codes that cause most rejections, then renders animated SVGs plus a manifest into .pr-lens/ (auto-gitignored).
  • Shares diagram-only requests through canvas push, handing back a login-free prlens.dev/c/{id} view link while keeping the edit link private.
  • For pull requests, writes a Markdown-image body and uploads assets with gh pr create/edit/comment --attach, with a fallback comment command using a published asset base URL.
  • Corrections go into a .github/pr-lens.yml overlay (rename, exclude, lane pinning) instead of hand-editing regenerated output.

Who it's for

  • Tech leads who want reviewers to grasp intent before reading the diff
  • Backend/platform engineers explaining refactors or shifting service boundaries
  • New joiners mapping an unfamiliar codebase with C4-style views

Example uses

  1. "Diagram this branch and open a PR" → graph authored, validated, rendered, attached as the architecture view in the PR description.
  2. "Show me how the billing module flows" → code-only read, container + data-flow views, canvas link returned.
  3. "That node is in the wrong lane" → add a lane rule to .github/pr-lens.yml, re-validate, re-render, same canvas link.

· · · 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/coldteadotai/pr-lens/HEAD/skills/pr-lens/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 skills/pr-lens folder from the GitHub repo coldteadotai/pr-lens into my ~/.claude/skills/coldteadotai-pr-lens/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/coldteadotai/pr-lens.git /tmp/pr-lens && mkdir -p ~/.claude/skills && cp -r /tmp/pr-lens/skills/pr-lens ~/.claude/skills/

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

  1. Confirm Node.js is installed (node -v); the skill invokes the CLI through npx.
  2. For PR attachments, check gh --version — the --attach flag needs GitHub CLI 2.99 or newer.
  3. Clone the repo: git clone https://github.com/coldteadotai/pr-lens.git /tmp/pr-lens
  4. Copy the skill: mkdir -p ~/.claude/skills && cp -r /tmp/pr-lens/skills/pr-lens ~/.claude/skills/
  5. Verify references/graph-document.md, references/config.md and references/example.graph.json came along.
  6. Restart Claude Code and ask: "Use PR Lens to diagram this change."
  7. Optional: to let analyze draft the document for you, export a Gemini/OpenAI (or compatible /chat/completions) API key.
View source on GitHub ↗License: MIT