fable-5-codebase-migration
Autonomous large codebase migration agent optimised for Claude Fable 5 (Mythos class). Scopes the migration, builds a dependency-ordered wave plan, executes incremental file changes, validates behaviour equivalence after each wave, and halts on first validation failure. Works on framework upgrades, API version bumps, language migrations, and architectural refactors spanning 10–500+ files.
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Install this skill
Run this command in your terminal. No account required — it auto-detects your AI tool and installs the skill file.
npx @skills-hub-ai/cli install fable-5-codebase-migrationSetup by platform
Install
One-click setup for your editorRun in your project root
npx @skills-hub-ai/cli install fable-5-codebase-migration --target claude-codeInstructions
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Frequently asked questions about fable-5-codebase-migration
What does the fable-5-codebase-migration skill do?
Autonomous large codebase migration agent optimised for Claude Fable 5 (Mythos class). Scopes the migration, builds a dependency-ordered wave plan, executes incremental file changes, validates behaviour equivalence after each wave, and halts on first validation failure. Works on framework upgrades, API version bumps, language migrations, and architectural refactors spanning 10–500+ files. It's a reusable SKILL.md instruction set that loads into your AI coding assistant on demand, no prompt engineering, no copy-pasting every session.
How do I install the fable-5-codebase-migration skill?
Run `npx @skills-hub-ai/cli install fable-5-codebase-migration` from your terminal. The CLI writes the SKILL.md to the correct location for your AI tool (e.g. ~/.claude/skills/fable-5-codebase-migration/ for Claude Code or ~/.cursor/skills/ for Cursor with --target cursor) and adds it to your project's .skills.json lockfile.
Which AI tools does fable-5-codebase-migration work with?
fable-5-codebase-migration runs in Claude Code. It follows the open Agent Skills standard (SKILL.md), so the same skill works in every supported tool without modification.
Is the fable-5-codebase-migration skill free?
Yes. Every skill on skills-hub.ai is free and open-source. There are no premium tiers, paywalls, or usage limits. You only pay for whatever AI assistant you're already using.
How do I use fable-5-codebase-migration after installing it?
In Claude Code, type `/fable-5-codebase-migration` (or whatever slash command the skill registers) and the AI follows the skill's instructions immediately. You can also reference it by name in natural language, your AI loads the skill into context when relevant.
Can I share the fable-5-codebase-migration skill with my team?
Yes. Commit your project's .skills.json lockfile and teammates run `npx @skills-hub-ai/cli install` (no args) to install every skill at the exact version you pinned. Organization-scoped installs work via skills-hub.ai organizations.