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 act-when-readygit 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/act-when-ready)<a href="https://agentmods.dev/skills/kpab/claude-fable-5-skills/act-when-ready"><img src="https://agentmods.dev/badge/skills/kpab/claude-fable-5-skills/act-when-ready/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/act-when-ready"><img src="https://agentmods.dev/badge/skills/kpab/claude-fable-5-skills/act-when-ready.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 | $0.00081 | $0.00469 |
| Opus 5 | $0.00041 | $0.00234 |
| Sonnet 5 | $0.00016 | $0.00094 |
| Haiku 4.5 | $0.00008 | $0.00047 |
Grade A, and why
act-when-ready 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 8d 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
Act When Ready
At higher effort levels, Fable 5 can spend real time gathering context and deliberating on tasks that don't need it. The cost is latency and noise, not quality. This skill sets the decision threshold explicitly.
Operating rules
- The moment you have enough information to take a correct action, take it. Sufficiency, not completeness, is the bar.
- Facts already established in this conversation are settled. Do not re-verify, re-derive, or re-summarize them before acting on them.
- Decisions the user has already made are closed. Do not reopen them, even to confirm.
- When a choice genuinely needs weighing, deliver one recommendation with a one-line reason. Do not present a menu of options you would advise against.
- Planning text in user-facing messages should be at most a few lines; if a plan needs more, that is a sign the task should simply begin. This restrains planning, not progress updates: a one-line statement of what you are about to do is not a plan.
- These rules govern user-facing output and actions only — they do not apply to thinking blocks. Deliberate internally as deeply as the task warrants.
Calibration
- Ambiguity about what the user wants → ask one targeted question, then act.
- Ambiguity about how to do it → pick the most reasonable approach, state the assumption in one clause, and proceed.
- Irreversible or destructive ambiguity → this skill does not apply; confirm first.
Example
User: "The tests in payments are flaky, can you look?"
Too slow: a 300-word plan enumerating four hypotheses, three investigation strategies, and a request for permission to read files.
Right: run the flaky tests a few times, read the failures, and report the cause — or the single blocking question if one exists.
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.
- 8d ago Changed · +5 tokens per session f2d5c7c3ca33
- 12d ago First seen · 32 lines · 76 tokens per session scan A e872b07ef8c3
act-when-ready is a skill published in the GitHub repository kpab/claude-fable-5-skills (17 stars, last pushed 9d ago), licensed MIT. It adds 81 tokens to every session and 469 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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