fable-mode
A Claude skill that activates Fable-style agentic behavior: explicit multi-stage planning, sub-agent delegation, and self-verification.
Fable-mode is a Claude skill that activates disciplined, multi-stage execution for complex tasks requiring decomposition, delegation, and verification. It guides Claude through explicit planning, parallel sub-agent delegation (when runtime tooling supports it), failable verification checks at each stage, and self-critique before delivery. The skill includes four variants (default, Opus, Sonnet, Haiku) that either run inline or spawn model-specific subagents. Developers install it by placing the skill directories into their Claude environment's skill-loading path, where it triggers automatically on multi-file or multi-session tasks.
Key Features
Use Cases
- 01Large refactoring tasks spanning multiple files or modules
- 02Multi-source research synthesis requiring independent data gathering
- 03Long-running development work split across multiple sessions
- 04Complex analysis tasks where systematic verification prevents errors
- 05Cost-sensitive high-volume work requiring structured execution (Haiku variant)
- 06Peak-quality synthesis tasks requiring Opus-level reasoning with Sonnet/Haiku sub-workers
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fable-mode — FAQ
What is fable-mode?+
Fable-mode is a Claude skill that enforces structured execution discipline on complex tasks by requiring explicit planning, stage-by-stage verification, sub-agent delegation, and self-critique. It shapes the procedure Claude follows but does not increase the underlying model's reasoning capability.
How do I install fable-mode for Claude?+
Place each skill directory (fable-mode and optionally fable-opus, fable-sonnet, fable-haiku) into the skills directory your Claude environment reads from, such as a skills folder used by Claude Code. The folder name must match the skill's frontmatter name field.
Which Claude clients support fable-mode?+
Fable-mode works with any Claude environment that loads skills, such as Claude Code. The Opus, Sonnet, and Haiku variants require a runtime with the Agent tool to spawn subagents.
Do I need API keys or special prerequisites?+
No API keys are required for the default fable-mode variant. The Opus, Sonnet, and Haiku variants require a Claude runtime that supports the Agent tool for subagent delegation.
Is fable-mode free to use?+
Yes, fable-mode is open source and free to use. Standard Claude API or subscription costs apply based on which model variant you choose and your runtime environment.
When should I use fable-mode versus running Claude normally?+
Use fable-mode for multi-file, multi-source, or multi-session tasks requiring systematic verification. Skip it for simple, single-pass tasks with one obvious approach, as staging adds overhead without benefit for trivial work.
How do I install fable-mode?+
Open the source repository on GitHub and follow its README. fable-mode is a skill — MCP Agents Market links you directly to the official repo.
Is fable-mode free?+
fable-mode is an open-source project hosted on GitHub. Check the repository for its license and any usage requirements.