Prompt FieldbookClaude Fable 5 · student edition

Programming reference · verified 17 Jul 2026

Write prompts that make hard coding work feel tractable.

Build a prompt, find a proven pattern, or diagnose a response that went off track.

Scope: Claude Fable 5 / Mythos 5, plus current cross-model prompting practices

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Quick help

Prompt anatomy

  1. Task — the action
  2. Context — facts Claude cannot infer
  3. Constraints — boundaries and trade-offs
  4. Output — format and acceptance criteria
  5. Checks — how “done” is verified

Syntax

<placeholder> means replace the whole value. XML-like tags such as <context> are literal structure you may keep.

Use triple backticks around pasted code. Never paste API keys, passwords, private data, or secrets.

Fast fixes

  • Wrong format → show one desired example.
  • Too broad → name what is out of scope.
  • Made-up progress → require tool evidence.
  • Stops early → state the real pause conditions.

Safety checkpoint

Ask before destructive or hard-to-reverse operations. Review generated commands before running them. Fable 5 may refuse some cybersecurity and life-science requests; handle stop_reason: "refusal" in API clients.

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