Files
ai-workflow-course/modules/23-working-with-existing-codebases/lab/skills/map-this-repo.md
T
claude 389ac2e460 style(no-slop): remove every em-dash + banned words across all modules + capstone
Apply the no-ai-slop standard (now binding in AGENTS.md): the em-dash character is
banned outright (restructured, not blind-replaced), plus the banned word/phrase
list (delve, leverage, robust, seamless, truly, unlock, etc.). 0 em-dashes remain
in modules + capstone; the only "robust" left is the planted M10 ai-change.patch
trap. Module H1 titles use a colon separator.

All deliberate teaching devices preserved; labs compile/parse (py/sh/yaml/json);
no junk. AGENTS.md updated with the hard no-slop rules.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TfzV5QvtPDz8LJS3Pu5VLT
2026-06-22 23:21:09 -04:00

1.8 KiB

Skill: Map this repo

A navigation playbook (a Module 21 skill) for orienting in a codebase you didn't write. Point Claude Code (or sub your own agent) at this file as a skill, or paste it in as instructions. The goal is a read-only mental model; no edits happen here.

When to use

At the start of any session on an unfamiliar repo, before any change is discussed.

Rules

  • Read only. Do not edit, create, or delete files while mapping. No exceptions.
  • Cite real paths. Every claim about the code must point to a file and, ideally, a line range. If you can't cite it, say "unverified" instead of guessing.
  • Breadth before depth. Establish the whole shape before going deep on any one area.
  • No conclusions from file names alone. A file called auth.py may not be where auth lives.

Steps

  1. Read the orientation pack (from orient.py), the README, and any CONTRIBUTING, ARCHITECTURE, or committed AI-instructions file. Treat these as claims to verify, not truth.
  2. Identify the entry points: how does this thing start? (CLI main, web server, library exports.) Name the exact file(s).
  3. Trace one representative request/command end to end, from entry point to where it does its real work and back. List the files it passes through, in order.
  4. Produce an architecture summary (max ~1 page):
    • One paragraph: what this project does and how it's structured.
    • A "where things live" table: concern -> directory/file.
    • The build/test/run commands, confirmed against the README or CI config.
    • 3-5 things that surprised you or look risky to touch.
  5. List open questions you could not resolve from the code. Do not paper over them.

Output

A single Markdown summary. End with: "Verified against: ."