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claude-fable

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why-was-fable-banned

Fable-style spec + evidence gate for Claude Code + Codex. Makes Opus/Codex work under Fable-like discipline: blocks every edit until a deterministic spec passes, and there is no "done" without live acceptance evidence. Spec-first, verification-gated, forbidden-paths enforced.

  • Updated Jun 30, 2026
  • Python

A Claude Code skill that brings Claude Fable 5's engineering discipline to Claude Opus 4.8 and other models: act decisively, ground progress claims in tool output, verify with fresh context, avoid over-engineering. Distilled from Anthropic's public Fable 5 migration guidance.

  • Updated Jun 14, 2026
  • HTML

claude fable 5 anthropic mythos-class model large language model artificial intelligence claude code free subscription window zenmux open source agent 1m context window adaptive thinking autonomous coding bug patching refactoring api console setup guide tutorial benchmarks safeguards developer tool command line interface

  • Updated Jul 8, 2026
  • TypeScript

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