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Explain how an existing subsystem, feature, or code path works now by tracing repository evidence.

Skill by grugh

IndexedMIT
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Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.

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About

Explain how an existing subsystem, feature, or code path works now by tracing repository evidence. Use for understanding current behavior, not historical intent.

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What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

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  • codeload.github.com · found in install command

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  • ~/.claude/skills/how

What's inside

Skill name
how
Description
Explain how an existing subsystem, feature, or code path works now by tracing repository evidence. Use for understanding current behavior, not historical intent.
License
MIT
Metadata
source: Lauren Tan, pstack: how. · opencode/autoinvoke: false
Instructions
32 lines in SKILL.md · view on GitHub

Files (5)

  • LICENSE
  • SKILL.md
  • openai.yaml · agents/
  • explainer-prompt.md · references/
  • explorer-prompt.md · references/

SKILL.md (first lines)

# How

Explore the codebase to answer "how does X work?" questions. Produce architectural explanations at the level of a senior engineer onboarding onto a subsystem, enough to build a working mental model, not so much that it reads like annotated source code.

## 1. Assess complexity

If the scope is ambiguous, state your interpretation and explore. The user can redirect.

- **Simple** (a single module, a small utility, a narrow question such as "how does function X work"): no explorers. Explore and explain in one pass in the current context, following `references/explainer-prompt.md` without the explorer-findings section. Go to step 4.
- **Complex** (a subsystem spanning multiple files or services, a cross-cutting feature, a full architectural overview): go to step 2.

When in doubt, take the simple path.

## 2. Explore (complex only)

Decompose the question into 2 to 4 angles, each a distinct slice of the subsystem. When delegation is available and authorized, run independent explorers concurrently using the harness's supported tools and models, each with `references/explorer-prompt.md` and its angle filled in. Give each read access without write authority. Otherwise investigate the same angles sequentially and keep their findings distinct before synthesis; disclose that the exploration was not independent.

## 3. Synthesize (complex only)

Once all exploration angles are complete, synthesize their findings into one explanation from `references/explainer-prompt.md` with every explorer's findings filled in. Use a separate explainer when delegation is available and authorized; otherwise perform a distinct synthesis pass yourself. Verify contradictions against the code.

## 4. Present

Present the explainer's output. Light edits for clarity or context from the conversation are fine. Do not substantially rewrite it.

## Output format

The explanation uses the sections defined in `references/explainer-prompt.md`, dropping any that do not apply: Overview, Key Concepts, How It Works, Where Things Live, Gotchas.

Do not edit project files.

From grugh/skills, MIT.

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Last commit (this folder)
Oct 13, 2026 (16 days ago)

From GitHub (fetched Oct 24, 2026).

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License
MIT
First seen
Oct 24, 2026
Last checked
Oct 24, 2026

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how skill. Agent Mart. https://agentmart.dev/skills/grugh-how (last updated 2026-10-24)