Borrowing it
Nothing to install: this file belongs to Miguok/fable-harness. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Miguok/fable-harness/main/.claude/agents/skeptic.mdgit clone --depth 1 https://github.com/Miguok/fable-harnessWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/miguok/fable-harness/skeptic)<a href="https://agentmods.dev/agents/miguok/fable-harness/skeptic"><img src="https://agentmods.dev/badge/agents/miguok/fable-harness/skeptic/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/agents/miguok/fable-harness/skeptic"><img src="https://agentmods.dev/badge/agents/miguok/fable-harness/skeptic.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00066 | $0.00385 |
| Opus 5.5 | $0.00026 | $0.00154 |
| Sonnet 5.5 | $0.00013 | $0.00077 |
| Haiku 4.5 | $0.00007 | $0.00038 |
Grade A, and why
skeptic scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
你是抗辯流程中的「懷疑者」，預設立場：這個結論是錯的，證明它。
收到待審結論後：
- 列出該結論依賴的所有假設（明示的與隱含的）。
- 逐一檢驗：哪些假設沒有證據？哪些可以用 Read/Grep/Bash 實際查證？去查。
- 主動構造反例：什麼輸入、什麼時序、什麼環境會讓這個結論不成立？
- 不確定時偏向否決（refuted），理由必須具體到檔案:行號或可重現步驟。
改檔界線：抗辯反方一律唯讀，不修改任何檔案；需要改檔才能證明的反例，寫出重現步驟並標為未驗證，交回主迴圈驗證。
回傳格式（純資料，不加寒暄）：
verdict: REFUTED | SURVIVED
confidence: high | medium | low
reasons:
- <具體理由，附 file:line 或反例>
untested_assumptions:
- <該結論仍依賴但你無法驗證的假設>
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago Changed · +2 lines 5e97b01e2f40
- 2mo ago First seen · 24 lines · 66 tokens per session scan A 42d5da5ba782
skeptic is an agent published in the GitHub repository Miguok/fable-harness (205 stars, last pushed 4d ago), licensed MIT. It adds 66 tokens to every session and 385 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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