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Nexus Query — Code Structure Lookup

One-command code structure and blast-radius queries to run before you refactor anything.

Dev & CodingIntermediate★ 164⑂ 15AI score 9/10Last updated: Mar 31, 2026

What it does

It extracts your repo into ast_nodes.json and answers structural questions instantly through five query modes:

  • --file: file skeleton (classes, methods, line numbers, imports)
  • --who-imports: every file importing a module, split into source vs. tests
  • --impact: blast radius as X upstream, Y downstream
  • --hub-analysis: real high-coupling hubs ranked by fan-in/fan-out
  • --summary: structural digest aggregated by top-level directory

Optional git_detective.py adds change-frequency risk data, and .gitignore / --exclude-dirs keep generated and vendored noise out of the graph.

Who it's for

  • Developers who want the caller list before changing an interface or signature
  • Anyone inheriting a large or unfamiliar legacy codebase
  • Tech leads sizing sprint work or prioritizing technical debt with real numbers

Examples

  1. "What breaks if I delete this interface?" → --who-imports for the caller list, then --impact for the ripple chain.
  2. "Is this change local surgery or full-body surgery?" → --impact <path> --git-stats shows downstream count plus git hotness.
  3. "Which module is the dangerous center of this repo?" → --hub-analysis --top 10 surfaces actual coupling hubs instead of guessing from folder names.

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

Install with a command instead

git clone https://github.com/Haaaiawd/Nexus-skills.git /tmp/nexus-skills && mkdir -p ~/.claude/skills && cp -r /tmp/nexus-skills/skills/nexus-query ~/.claude/skills/

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

  1. Confirm Python 3.10+ is installed locally: python3 --version
  2. Clone the repo: git clone https://github.com/Haaaiawd/Nexus-skills.git
  3. Copy the skill into your Claude skills folder: mkdir -p ~/.claude/skills && cp -r Nexus-skills/skills/nexus-query ~/.claude/skills/
  4. Install dependencies: pip install -r ~/.claude/skills/nexus-query/scripts/requirements.txt
  5. Restart Claude Code, then ask something like "who depends on this module?" to confirm the skill triggers.
  6. On first run, if no AST exists, extract_ast.py will generate .nexus-map/raw/ast_nodes.json (takes a few seconds).
View source on GitHub ↗