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Agent skill

Fable Haiku

by mrtooher in mrtooher/fable-mode

Run fable-mode execution discipline on Claude Haiku. An agent skill from mrtooher/fable-mode.

No licenceAuto-check passedProductivity & Automation

Install Fable Haiku

skills CLI
$ npx skills add mrtooher/fable-mode --skill fable-haiku -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mrtooher/fable-mode fable-haiku --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mrtooher/fable-mode.git skills-src && mkdir -p .claude/skills && cp -r skills-src/fable-haiku .claude/skills/fable-haiku && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
fable-haiku
GitHub stars
872
Token cost
~565 tokens
SKILL.md length
235 words
Files
1
Skills in repo
7
Repo updated
First seen
Licence
None found

At a glance

Run fable-mode execution discipline on Claude Haiku. An agent skill from mrtooher/fable-mode.

  • Works in 6 steps: Confirm fable-worker-haiku appears in… → Spawn @fable-worker-haiku via the Task… → Haiku is cheap: for independent… → …
  • The user explicitly asks for thorough/systematic handling run cheaply
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Fast (fable on haiku

What it does

Fable Haiku is an agent skill from mrtooher/fable-mode. Run fable-mode execution discipline on Claude Haiku. Routes the task to the @fable-worker-haiku agent, whose definition carries the staged loop with tightened verification (no bare "unverified" allowed) and an escalate-don't-improvise rule. Trigger when the user explicitly asks for thorough/systematic handling run cheaply or fast ("fable on haiku", "deep work mode but cheap", "stage this on haiku"). For bulk mechanical work. Do NOT use for tasks needing synthesis — benchmark note: at n=1 the skill's effect on…

Its SKILL.md is about 570 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Productivity & Automation, covering Focus and ADHD support. The repository describes itself as: A Claude skill that activates Fable-style agentic behavior: explicit multi-stage planning, sub-agent delegation, and self-verification.

When your agent uses it

  • The user explicitly asks for thorough/systematic handling run cheaply
  • Fast (fable on haiku
  • Deep work mode but cheap
  • Stage this on haiku)

Example prompts

  • “unverified”
  • “fable on haiku”
  • “deep work mode but cheap”
  • “/fable-haiku”

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Confirm fable-worker-haiku appears in the available agent types. If not,
  2. Spawn @fable-worker-haiku via the Task tool (`subagent_type
  3. Haiku is cheap: for independent sub-parts, fan out one worker per part and
  4. Follow with @fable-verifier (a second Haiku is cheap; fresh eyes can't
  5. If a worker escalates ("needs synthesis"), re-route that part to
  6. Mandatory delivery gate: before presenting the result to the user, invoke

What it can do on your machine

Read from SKILL.md and the folder at commit a368f94. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Fable Haiku loads about 565 tokens when it runs. Until then it costs about 155 tokens; SKILL.md has 235 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~155
When it runs · the whole SKILL.md, loaded when a task matches
~565

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 235 words (~565 tokens).

“v3 change: the worker is a real agent definition (agents/fable-worker-haiku.md) invoked by name. Its system prompt carries the loop, the tightened verification rule, and the operational rules; this skill only routes.”

— opening of SKILL.md by mrtooher
name
fable-haiku

Read the full SKILL.md on GitHub

Files

Just SKILL.md in fable-haiku of mrtooher/fable-mode.

Open the folder on GitHubat commit a368f94

Compare with similar skills

Fable Haiku next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Fable Haiku compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Fable Haiku this skillmrtooher/fable-mode872—~565Automated safety check: PassNone
I Have AdhdTanStack/ai3.2k5 repos~1.8kAutomated safety check: PassMIT
Attention Kindalexgreensh/attention-span1.4k—~2kAutomated safety check: PassAGPL-3.0
Remind Meshaheer-00/claude-adhd104—~1.1kAutomated safety check: PassNone
Daily Focus Boardgithub/awesome-copilot40k—~3kAutomated safety check: PassMIT
Attention Controlaaddrick/attention-control118—~3.6kAutomated safety check: PassMIT

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Categories

Questions about Fable Haiku

What does Fable Haiku do?

Run fable-mode execution discipline on Claude Haiku. An agent skill from mrtooher/fable-mode. Fable Haiku is an agent skill from mrtooher/fable-mode. Run fable-mode execution discipline on Claude Haiku.

When should I use Fable Haiku?

Fable Haiku fits situations like: the user explicitly asks for thorough/systematic handling run cheaply; fast (fable on haiku; deep work mode but cheap; stage this on haiku).

How do I install Fable Haiku in Claude Code?

Run `npx skills add mrtooher/fable-mode --skill fable-haiku -a claude-code`. Or copy the skill folder (fable-haiku in mrtooher/fable-mode) into .claude/skills/fable-haiku in your project. Claude Code loads it when a task matches its description.

How do I install Fable Haiku in Codex?

Run `npx skills add mrtooher/fable-mode --skill fable-haiku -a codex`. Or copy the skill folder (fable-haiku in mrtooher/fable-mode) into .agents/skills/fable-haiku in your project. Codex loads it when a task matches its description.

Can I use Fable Haiku in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mrtooher/fable-mode --skill fable-haiku -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fable-haiku, .gemini/skills/fable-haiku, .github/skills/fable-haiku and .opencode/skills/fable-haiku in your project.

What does Fable Haiku need to run?

SKILL.md names no scripts, command-line tools or credentials: Fable Haiku is instructions for the agent only.

Does Fable Haiku access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Fable Haiku safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Fable Haiku use?

No licence was found for Fable Haiku or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Fable Haiku use?

About 565 tokens (SKILL.md is roughly 2.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Fable Haiku?

Skills that share tags, products or a category with Fable Haiku: I Have Adhd (TanStack/ai, 3.2k stars), Attention Kind (alexgreensh/attention-span, 1.4k stars), Remind Me (shaheer-00/claude-adhd, 104 stars) and Daily Focus Board (github/awesome-copilot, 40k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Fable Haiku?

mrtooher (a GitHub user) maintains it in mrtooher/fable-mode, which has 872 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on September 2, 2026.

Source: mrtooher/fable-mode on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.