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Choose and tune the effort setting for Claude Fable 5 workloads. Use whenever the user asks which effort level to use ("what effort should this batch job run at?", "is xhigh worth it here?"), complains that Fable 5 is slow or expensive, wants to cut latency or token cost, designs a pipeline/harness that mixes routine and hard tasks, or reviews API code that sets output_config.effort.
How this skill is triggered — by the user, by Claude, or both
Slash command
/fable5-skills:effort-calibratorThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
On Fable 5, effort is the primary dial trading intelligence against latency and cost. Defaults that were right for earlier models are usually wrong here: Fable 5 at lower effort frequently beats earlier models at their maximum, so over-provisioning effort wastes money and time without adding quality.
On Fable 5, effort is the primary dial trading intelligence against latency and cost. Defaults that were right for earlier models are usually wrong here: Fable 5 at lower effort frequently beats earlier models at their maximum, so over-provisioning effort wastes money and time without adding quality.
| Workload | Start at |
|---|---|
| Routine transforms, classification, short edits, chat | medium (try low if latency matters) |
| Most analysis and writing | high (the general default) |
| Coding and agentic/tool-heavy work | high, escalating to xhigh for harder tasks — xhigh is the best setting for most coding/agentic work and is Claude Code's default |
| Hardest capability-sensitive work: large migrations, multi-day autonomous runs, novel research | xhigh |
Frontier problems only, where evals show headroom above xhigh and token spend is unconstrained | max |
max is rarely the right answer: on most workloads it adds significant cost for small gains and can tip into overthinking. Reach for it only when xhigh has measurably fallen short.
Lower effort when:
Raise effort when:
Route by task class, not by a single global setting: a triage step at low/medium that escalates hard cases to high/xhigh usually dominates any fixed choice on both cost and quality. Verify with the current API reference before shipping parameter names or values: https://platform.claude.com/docs/en/build-with-claude/effort
npx claudepluginhub kpab/claude-fable-5-skills --plugin fable5-skillsCreates, edits, and optimizes skills for Claude Code, including drafting, evaluating with test prompts, iterating on performance, and improving skill descriptions for better triggering accuracy.