Get an independent architecture/implementation plan from Anthropic Claude (Fable, a different vendor's model) running Claude Code's native plan mode, from inside a non-Claude host such as Codex. Use mid-execution when work hits a genuine design fork or high-stakes decision that should not be settled unilaterally. Not for routine planning — that stays in the host's own plan tooling. Explicit invocation only. Triggers: "claude plan", "ask fable for a plan", "fable planning", "问 fable", "让 fable 出方案", "外脑出方案".
How to install claude-plan?
ancienttwo/repo-harness/claude-plan
$npx -y skills add ancienttwo/repo-harness --skill claude-planInstalls into the current project.
›Prefer a prompt? Paste this to your agent
Run `npx skills use "https://github.com/ancienttwo/repo-harness" --skill "ancienttwo/repo-harness/claude-plan"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/ancienttwo/repo-harness" that are relevant to the current task. Run `npx skills add "https://github.com/ancienttwo/repo-harness"` and select the relevant skills, then follow their instructions.
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