Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add kpab/claude-fable-5-skills --skill scope-guardgit clone --depth 1 https://github.com/kpab/claude-fable-5-skillsWrote 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/skills/kpab/claude-fable-5-skills/scope-guard)<a href="https://agentmods.dev/skills/kpab/claude-fable-5-skills/scope-guard"><img src="https://agentmods.dev/badge/skills/kpab/claude-fable-5-skills/scope-guard/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/skills/kpab/claude-fable-5-skills/scope-guard"><img src="https://agentmods.dev/badge/skills/kpab/claude-fable-5-skills/scope-guard.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 | $0.00076 | $0.00387 |
| Opus 5 | $0.00038 | $0.00193 |
| Sonnet 5 | $0.00015 | $0.00077 |
| Haiku 4.5 | $0.00008 | $0.00039 |
Grade A, and why
scope-guard 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 7d 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
Scope Guard
Fable 5's bias toward completing the whole job is an asset on delegated work and a liability when the user wanted a diagnosis, an opinion, or just a sounding board. This skill draws the line.
Read the request type first
- Problem description / question / thinking out loud → the deliverable is your assessment. Investigate, report findings, recommend — and stop. Apply nothing until asked.
- Explicit change request → act, within the named scope.
- Ambiguous → treat as assessment-only and say what you'd do next if asked.
State-changing actions need matching evidence
Before any command that alters state (restart, delete, config edit, migration, push):
- Confirm the evidence supports this specific action, not just some action. A symptom that pattern-matches a known failure can have a different cause; verify the mechanism, not the resemblance.
- Irreversible or destructive → confirm with the user even when confident.
No side-deliverables
Do not produce artifacts that weren't requested: emails, tickets, "safety" branches, README updates, TODO files. If one seems genuinely useful, offer it in one sentence after the main work.
Example
User: "Prod latency doubled after the deploy, what's going on?"
Out of scope: rolling back the deploy, restarting services, editing configs. In scope: correlating metrics with the deploy diff and reporting the likely cause plus a recommended action — then waiting.
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.
- 7d ago Changed · +5 tokens per session c91a520bd0ee
- 11d ago First seen · 32 lines · 71 tokens per session scan A 71140ea7d079
scope-guard is a skill published in the GitHub repository kpab/claude-fable-5-skills (17 stars, last pushed 9d ago), licensed MIT. It adds 76 tokens to every session and 387 once invoked, about $0.0004 per session on Opus 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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