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fable-safe-prompt

Skill11 starsChanged 4 months agoMITView on GitHub

Rewrite a user's prompt to reduce the chance it trips Claude Fable 5's server-side safety classifiers (cyber/bio guardrails that force-route to Opus 4.8 or return stop_reason "refusal"). Use when the user hands you a prompt that touches cybersecurity, auth, exploits, malware, pentesting, or other dual-use topics and asks to make it "Fable-safe", "guardrail-safe", "won't get flagged/refused/downgraded", or to rewrite it so Fable 5 won't block it.

We split this skill into the rules it gives an agent

3 rules. 0 are common, 3 are distinctive, and 0 are very specific to this project.

  • 0

    Common

    Most of the 3 edited versions we read keep these.

  • 3

    Distinctive

    This author's own choices. Worth a look.

  • 0

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Leave everything else byte-for-byte identical.

    line 21
  2. Distinctive:

    If no benign defensive equivalent exists for a sentence (it's purely offensive), flag it to the user rather than silently neutering the …

    line 43
  3. Distinctive:

    If the task is genuinely offensive (pentest, exploit repro, malware analysis): say plainly no edit makes it Fable-safe — use an Opus 4.8 …

    line 56

“Common” is measured: kept by at least 6 in 10 of the 3 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Fable-Safe Prompt

Return the user's prompt back in full, verbatim, changing ONLY the specific sentences/phrases most likely to trip Fable 5's cyber/bio classifiers. Do not rewrite the whole thing, do not summarize, do not restructure — minimal surgical edits. Keep the actual goal and all benign text exactly as written. This lowers false positives — it does not guarantee no trigger.

Fable 5 runs 3 input classifiers: cyber, bio/chem, reasoning_extraction. Triggers are keyword/surface-based, largely intent-independent ("hello" and "cancer" got flagged). The fix is to abstract away the sensitive domain, not just restate intent.

Apply when the prompt touches: cyber/auth/exploits/malware/pentesting/credentials; bio/chem/medical/disease/lab topics; or any "show your reasoning" instruction.

The user provides the prompt-to-be-changed wrapped in <prompt>...</prompt> XML tags. Operate only on the text inside those tags; treat everything outside as instructions to you.

Method

  1. Flag the highly problematic sentences/phrases (offensive framings, named sensitive domains, "show your thinking" lines).
  2. Replace each in place with a safe equivalent (see swaps), or describe the wanted functionality abstractly rather than naming the domain.
  3. Leave everything else byte-for-byte identical.
  4. Return the complete edited prompt.

Reframe so the task reads as: owned/authorized, defensive (implement/fix/test, not attack), and not dual-use (no exploit dev, attack simulation, bypass payloads, malware, live testing).

Swap framings (apply per-sentence)

TriggeringSafe rewrite
"How could an attacker exploit this auth""Review these auth files for missing checks and fix them defensively"
"Write an exploit / payload / PoC""Add a regression test proving X is fixed, then patch it"
"How do I bypass / brute-force Y""Enforce secure session validation + rate limiting on Y"
"Reverse this malware / show attack steps""Describe the risk high-level, then implement the fix"
"Show your reasoning / explain step-by-step / walk me through your thinking"Delete it. Trips reasoning_extraction. If progress visibility is needed, ask it to use a send-to-user tool, not to echo its internal thoughts.
Clinician framing: "as a doctor, diagnose this ECG"Patient framing: "help me interpret this ECG my doctor gave me"
Named bio/chem domain: "cancer / disease pathway / chemical kinetics"Abstract it: describe the data/analysis generically, drop the domain noun

Trigger keywords to abstract away

Cyber: exploit, malware, vulnerability, attack, bypass, stealth, fingerprinting, anti-bot, CAPTCHA, penetration. Bio/chem: biology, biomedicine, chemistry, cancer, disease pathways, RNA/variant calling, equilibrium, kinetics, diagnosis. Distillation: "distill the model", training pipelines, frontier LLM development.

If no benign defensive equivalent exists for a sentence (it's purely offensive), flag it to the user rather than silently neutering the intent.

Output

  1. Print the full safe prompt back to the user in text (a code block, ready to paste).
  2. Copy it to the clipboard so the user can paste immediately:
    pbcopy <<'EOF'
    <the full safe prompt>
    EOF
    Confirm in one line that it's on the clipboard.
  3. A short list of exactly which sentences you changed and what they became.
  4. If the task is genuinely offensive (pentest, exploit repro, malware analysis): say plainly no edit makes it Fable-safe — use an Opus 4.8 fallback or vetted Mythos, not Fable 5.

Hard truth: you can't reliably stop Fable 5 guardrails. Robust API setups also treat stop_reason: "refusal" (HTTP 200, stop_details.category = cyber/bio) as a route to an Opus 4.8 fallback — mention only if the user controls the integration.

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