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Get Started Free →This skill should be used when the user asks for a "Fable second opinion", wants to "check a plan before committing", needs another view after repeated failures, or explicitly invokes "fable-advisor".
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-07 | ✗→✓ | ▲ Improved | -68% | 0% |
| case-12 | ✗→✓ | ▲ Improved | -50% | 0% |
| case-02 | ✗→✓ | ▲ Improved | 578% | 0% |
| case-06 | ✗→✓ | ▲ Improved | -44% | 0% |
| case-08 | ✗→✓ | ▲ Improved | -55% | 0% |
Get a focused second opinion from Claude Fable 5 without substituting the host tool's model.
fable-advisor agent. Do not launchanother Claude Code process.
reaches standard input:
node scripts/ask_fable.mjs <<'REVIEW' the review request REVIEW
State the decision, the evidence behind it, and any constraint that changes the verdict. Name the paths that matter: the reviewer has read-only access and checks load-bearing claims itself.
Return Fable's answer without rewriting it. If claude is missing or unauthenticated, surface the error and ask the user to install it or sign in. Never review in its place.
Other measured skills in the registry, with their headline benchmark lift.