lathe: Skill for Claude Code

Lathe — Ask About a Part

Answer a reader's question about one part of a stored tutorial, grounded in what that tutorial actually built. Triggered by:

/lathe-ask <slug> <part-NN.md>
<the reader's question>

The web "Ask" button pastes exactly that: the slug and part on the command line, the question on the next line. Parse all three.

Protocol

1. Read the part at ~/.lathe/tutorials/<slug>/<part-NN.md>. Read sibling parts (part-NN.md in the same dir) when the question reaches across parts or depends on earlier setup — continuity matters here too.

2. Answer grounded in this tutorial's concrete artifact — the same controlling example, the same numbers, the same voice the tutorial used. The reader is asking about their synth / their key-value store, not the topic in the abstract. Don't re-teach the whole topic from scratch.

3. Point at the tutorial, don't re-derive it. Prefer "look at the process_buffer loop in §3 — the modulo there is doing X" over a fresh ground-up explanation. You're a guide standing next to them at the page they're reading.

4. Be honest about gaps. If the question exposes something the tutorial got wrong, glossed over, or left under a [!UNVERIFIED] flag, say so plainly — don't paper over it. That's more useful than a confident hand-wave.

5. Stay engaged for follow-ups. This is a conversation, not a one-shot reply.

Boundaries — read-only, conversational

• There is no lathe ask command. This skill writes nothing and calls back into no CLI command — ask is deliberately conversation-only.
• No state mutation: don't touch metadata.json, verify-result.json, or the part markdown. Don't verify, don't extend, don't tag.
• Keep answers specific to this tutorial's concrete artifact, in its voice.