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Code Understand — On-Demand Architecture Focus Map

Generates a ranked focus map of the load-bearing files, symbols, callers and dependencies in an unfamiliar codebase, each with file:line citations.

Dev & CodingIntermediate★ 3,691⑂ 371AI score 9/10Last updated: Nov 5, 2026

What it does

  • Produces a ranked focus map of the symbols and files the architecture hangs on, each with a file:line citation and an evidence type (defines / imports / call edge / text match).
  • Supports impact analysis via --changed <file> or --since <sha> so you can see the blast radius of a diff before you finish it.
  • Auto-selects a backend: CodeGraph if installed, then an existing Graphify graph (read-only), otherwise a dependency-free builtin regex extractor plus rg.
  • Includes a GUARD: if the command is missing or fails, Claude falls back to ordinary grep/read exploration instead of stalling.
  • Explicit hygiene rules: treat output as a disposable cache, never commit the raw JSON or .codegraph/ directory.

Who it's for

  • Developers onboarding onto a legacy project or exploring an unfamiliar open-source repo.
  • Anyone planning a large refactor who wants "what would break?" answered first.
  • Engineers who want PR descriptions and commit messages backed by real file:line pointers.

Example uses

  1. "How does authentication work in this repo?" → run obsidian-wiki code-understand --project ., read only the cited locations, then explain with citations.
  2. Before reshaping a payment module → --changed src/payment/*.ts to list its callers and callees.
  3. Reviewing a branch's reach → --since origin/main --max-symbols 100 --pretty.

· · · 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/Ar9av/obsidian-wiki/HEAD/skills/code-understand/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 AI Skill Mart.
Copy the skills/code-understand folder from the GitHub repo Ar9av/obsidian-wiki into my ~/.claude/skills/ar9av-code-understand/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/Ar9av/obsidian-wiki.git /tmp/obsidian-wiki && mkdir -p ~/.claude/skills && cp -r /tmp/obsidian-wiki/skills/code-understand ~/.claude/skills/

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

  1. Open a terminal and clone the repo: git clone https://github.com/Ar9av/obsidian-wiki.git
  2. Create the skills folder: mkdir -p ~/.claude/skills
  3. Copy the skill in: cp -r obsidian-wiki/skills/code-understand ~/.claude/skills/
  4. Install the obsidian-wiki CLI that this skill drives, following the repo's README.
  5. (Optional) For richer cross-file call-graph evidence, install npm install -g @colbymchenry/codegraph — only with your own go-ahead.
  6. Verify availability with obsidian-wiki doctor --project . and check the code-understanding.* capability lines.
  7. Restart Claude Code and ask something like "map the architecture of this codebase" to trigger the skill.
View source on GitHub ↗License: MIT