Prompt library

One job: read from and append to docs/prompt-library.md, a checked-in file of prompts that worked well in this repo. Not a general prompt-engineering guide — just a save/retrieve mechanism so a good prompt doesn't get re-derived from memory every time.

Before writing a new prompt from scratch

Check docs/prompt-library.md for an existing entry covering the same task (same tool, same kind of request). If one's close, adapt it instead of starting over.

When to save one

Only add an entry when a prompt clearly outperformed a first attempt — noticeably better structure, fewer follow-up corrections, or a result the user explicitly praised. Routine prompts that worked as expected don't need an entry; this is a library of wins, not a transcript log.

Entry format

Append to docs/prompt-library.md under the right category heading:

### <short title>

**Use for:** <the situation this applies to>
**Prompt:**
> <the exact prompt text, with [placeholders] for the variable parts>
**Why it works:** <one line — the specific thing that made it effective>

Keep entries short. If the file doesn't have a fitting category heading yet, add one (## <Category>) rather than forcing the entry under an unrelated one.