Orienting Codebases

Interactive codebase orientation for the human, not the agent. Same tree-sitting + featuring pipeline as exploring-codebases, but synthesizes into guided HTML exercises via composing-html instead of analysis documents. See README.md for design rationale.

Pipeline

0. Setup (once per session)

uv venv /home/claude/.venv 2>/dev/null
uv pip install tree-sitter-language-pack --python /home/claude/.venv/bin/python
export PYTHON=/home/claude/.venv/bin/python
export TREESIT=/mnt/skills/user/tree-sitting/scripts/treesit.py
export GATHER=/mnt/skills/user/featuring/scripts/gather.py
export COMPOSE=/mnt/skills/user/composing-html/scripts/build.py

1. Get the repo

OWNER=... REPO=... REF=main
curl -sL -H "Authorization: Bearer $GH_TOKEN" \
  "https://api.github.com/repos/$OWNER/$REPO/tarball/$REF" -o /tmp/$REPO.tar.gz
mkdir -p /tmp/$REPO && tar -xzf /tmp/$REPO.tar.gz -C /tmp/$REPO --strip-components=1

For local repos, skip the curl — point directly at the path.

2. Structural scan

$PYTHON $TREESIT /tmp/$REPO --stats

3. Feature gathering

$PYTHON $GATHER /tmp/$REPO \
  --skip tests,.github,node_modules --source-budget 8000

4. Targeted source extraction

For each exercise target identified from gather output, extract the actual source using treesit queries:

# Entry point source
$PYTHON $TREESIT /tmp/$REPO --no-tree 'source:main'

# Specific function for an exercise
$PYTHON $TREESIT /tmp/$REPO --no-tree 'source:validate_token'

# Imports for a hub file
$PYTHON $TREESIT /tmp/$REPO --no-tree 'imports:src/api.py'

This source feeds directly into the HTML artifact — the user sees real code, syntax-highlighted, without having to navigate the repo.

Do not show raw pipeline output to the user. It's material for exercise design. The user sees HTML artifacts and conversation.

Orientation session

After the pipeline steps, synthesize into an interactive orientation. Three phases.

Phase A: Framing (1 message, no artifact)

Summarize the repo in ONE sentence (what it does, who it's for). Then:

I can walk you through a hands-on orientation — about 15 minutes, two exercises that'll give you a working mental model of this codebase. Want to try it?

Do not start exercises without confirmation.

Phase B: Exercises (2 exercises, interactive)

For each exercise, generate an HTML artifact using composing-html's freeform template, then continue the conversation around it.

#### Artifact structure per exercise

Build a spec with body_html containing:

<section class="stack">
  <div class="eyebrow">EXERCISE 1 OF 2</div>
  <h2>[Exercise title]</h2>

  <div class="card">
    <div class="eyebrow">CONTEXT</div>
    <p>[Brief explanation of what this code does in the system
       and why it matters for orientation.]</p>
  </div>

  <div class="card">
    <div class="eyebrow">CODE</div>
    <pre><code>[Actual source extracted by treesit — entry point,
function, config, imports, or test names. Escaped properly.]</code></pre>
  </div>

  <details class="card">
    <summary>
      <span class="badge badge--clay">Your turn</span>
      [Specific comprehension/synthesis question]
    </summary>
    <div style="margin-top:1rem">
      <div class="eyebrow">KEY POINTS</div>
      <p>[Pre-generated feedback covering what the code reveals about
         the system's architecture, design decisions, or workflow.
         This is the "answer key" — hidden until clicked.]</p>
    </div>
  </details>
</section>

Answers live inside <details> — the DOM hides them until the user clicks. Do not preview or summarize the key points in chat after presenting the artifact; that defeats the exercise.

Build and present the artifact:

python3 $COMPOSE build freeform --spec /tmp/exercise_N.json --out /tmp/exercise_N.html

#### Two interaction modes

After presenting the artifact, tell the user:

Take a look at the code and the question. You can either: - Tell me your answer in chat and I'll give you specific feedback - Click to reveal the key points in the artifact when you're ready

If they respond in chat: give personalized feedback based on what they actually said — confirm what's right, be specific about gaps, explore misconceptions. This is pedagogically richer than pre-canned feedback.

If they click through: that's fine too — the artifact's hidden feedback covers the essential points. Move to the next exercise.

#### Exercise design from pipeline signals

Each exercise type maps to specific pipeline output:

Entry-point walkthrough — gather found clear entry points: Show the main function/handler source. Ask what the program does on startup and what the 2-3 most important operations are.

Architecture synthesis — treesit --stats shows clear directory structure: Show the directory tree with file counts and symbol density. Ask what the system's main components are and how they relate.

Dependency detective — gather found import clusters: Show a hub file's imports. Ask what the import list reveals about the file's role — integration point, orchestrator, leaf node?

Config reader — manifest/config files are rich: Show the config file. Ask which 2-3 settings they'd change first for a new project and why.

Test-as-spec — test files present and readable: Show test names (not bodies). Ask what the tests tell them about what the module is supposed to do.

Phase C: Synthesis (1 message after exercises)

After both exercises, ask in chat (no artifact needed):

What's one thing about this codebase that surprised you, or that you want to dig into further?

Use their answer to either:

• Point them to a specific file or symbol for independent exploration
• Offer a targeted follow-up exercise — but only if they want more

Producing orientation.html (optional)

If the user asks for a persistent orientation document, or if the session produced insights worth preserving, generate a standalone HTML artifact that any teammate can open in a browser without tooling.

Build via composing-html freeform with this body structure:

<section class="stack">
  <div class="card">
    <div class="eyebrow">PURPOSE</div>
    <p>[One-line: what this repo does and why it exists.]</p>
  </div>

  <div class="card">
    <div class="eyebrow">LANGUAGES</div>
    <p>[From treesit --stats.]</p>
  </div>

  <h2 class="rule">Key files</h2>
  <div class="grid grid--2">
    [For each of 6-10 key files from gather's density ranking:]
    <div class="card card--soft">
      <code>[path/to/file]</code>
      <p>[What it does — why a new developer should read it.]</p>
    </div>
  </div>

  <h2 class="rule">Core concepts</h2>
  [For each of 3-5 concepts:]
  <details class="card">
    <summary><strong>[Concept name]</strong> — [one-line summary]</summary>
    <p>[Where it lives in the code. Why it matters.]</p>
  </details>

  <h2 class="rule">Orientation exercises</h2>
  <p>Two exercises to build a working mental model. Read the code,
  answer the question, then click to check your understanding.</p>

  [Exercise 1 — same card+details structure as Phase B artifacts]
  [Exercise 2 — same structure]
</section>

Spec keys:

{
  "title": "Orientation: [repo name]",
  "eyebrow": "CODEBASE ORIENTATION",
  "subtitle": "[one-line purpose]",
  "show_masthead": true,
  "page_class": "page page--narrow",
  "body_html": "..."
}

Build and present:

python3 $COMPOSE build freeform --spec /tmp/orientation_spec.json \
  --out /mnt/user-data/outputs/orientation.html

Feedback and scaffolding

Feedback after chat responses

When the user responds in chat (rather than clicking the reveal):

• If correct: confirm briefly, then extend ("Right — and that connects

to [next concept] because...")

• If partially correct: acknowledge what's right, be specific about

what's missing, explore the gap

• If wrong: say so directly without softening, then walk through the

actual behavior together

• Do not attribute understanding the user didn't demonstrate. If they

described what happens but not why, acknowledge the what without crediting causal understanding.

Fading scaffolding

Adjust the amount of code shown and question specificity based on demonstrated familiarity — but always keep the answer as the user's responsibility.

Fading adjusts the difficulty of finding and reading the code, not explaining it. At every level the user still produces the synthesis.

If the user struggles, move UP the ladder (show more code, be more specific), not sideways (hint at the answer).

When to use this vs. other skills

This skill is the orientation layer — first-encounter mental model building. For ongoing learning during development (exercises after commits, retrieval check-ins, prediction drills), pair with learning-opportunities from DrCatHicks/learning-opportunities.