Formax Skill Capture
yusifeng/formax
A skill your agent uses when we want to turn a just-finished Formax workflow (e.g.
Enforces staged execution discipline on large tasks: a written stage plan, delegation to named fable agents where the runtime supports it, a failable verification check at each stage, and a…
Install Fable Mode
$ npx skills add mrtooher/fable-mode --skill fable-mode -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mrtooher/fable-mode fable-mode --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
Claude Code skills documentation · loads skills from .claude/skills/
Install the "fable-mode" agent skill from https://github.com/mrtooher/fable-mode/tree/main into .claude/skills/fable-mode/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fable-mode", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mrtooher/fable-mode --skill fable-mode -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mrtooher/fable-mode fable-mode --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "fable-mode" agent skill from https://github.com/mrtooher/fable-mode/tree/main into .agents/skills/fable-mode/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fable-mode", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mrtooher/fable-mode --skill fable-mode -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mrtooher/fable-mode fable-mode --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "fable-mode" agent skill from https://github.com/mrtooher/fable-mode/tree/main into .cursor/skills/fable-mode/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fable-mode", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mrtooher/fable-mode --skill fable-mode -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mrtooher/fable-mode fable-mode --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "fable-mode" agent skill from https://github.com/mrtooher/fable-mode/tree/main into .gemini/skills/fable-mode/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fable-mode", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install mrtooher/fable-mode fable-modeInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add mrtooher/fable-mode --skill fable-mode -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "fable-mode" agent skill from https://github.com/mrtooher/fable-mode/tree/main into .github/skills/fable-mode/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fable-mode", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mrtooher/fable-mode --skill fable-mode -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install mrtooher/fable-mode fable-mode --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "fable-mode" agent skill from https://github.com/mrtooher/fable-mode/tree/main into .opencode/skills/fable-mode/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "fable-mode", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
fable-mode- GitHub stars
- 870
- Token cost
- ~1k tokens
- SKILL.md length
- 491 words
- Files
- 24
- Skills in repo
- 7
- Repo updated
- First seen
- Licence
- None found
At a glance
Enforces staged execution discipline on large tasks: a written stage plan, delegation to named fable agents where the runtime supports it, a failable verification check at each stage, and a…
- The user explicitly asks (do this thoroughly
- SKILL.md covers When NOT to use this, v3 delegation rule — the…, Core loop (inline fallback;… and Domain checks, plus 1 more section
- Runs Python scripts from its folder
- Deep work mode) OR when the task objectively spans multiple files
What it does
Fable Mode is an agent skill from mrtooher/fable-mode. Enforces staged execution discipline on large tasks: a written stage plan, delegation to named fable agents where the runtime supports it, a failable verification check at each stage, and a skeptical self-review before delivery. Trigger when the user explicitly asks ("do this thoroughly", "be systematic", "deep work mode") OR when the task objectively spans multiple files, multiple sources, or multiple sessions. Do NOT trigger on ordinary multi-step requests that a direct attempt handles fine. For a run pinned to…
Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 25 other files (for example `BENCHMARK-2026-09-02.md`, `EXAMPLE.md` and `README.md`).
It sits in AI & LLM Engineering, covering Focus and ADHD support and LLM guardrails. 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 (do this thoroughly
- Deep work mode) OR when the task objectively spans multiple files
- Multiple sources
- Multiple sessions
Example prompts
- “do this thoroughly”
- “be systematic”
- “deep work mode”
- “/fable-mode”
Requirements
- Python 3
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
Ships script files (Python, from the files we listed), which the agent can run.
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 Mode loads about 1k tokens when it runs. Until then it costs about 184 tokens; SKILL.md has 491 words of instructions outside code blocks.
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 491 words (~1,049 tokens).
“Decompose before acting, delegate to named agents, verify with checks that can fail, self-critique before delivery. The skill shapes procedure, not capability: benchmarked 2026-07 — on short graded tasks Opus/Sonnet score the same with or without it; the measured value…”
- name
- fable-mode
Files
SKILL.md and 23 other files in the repository root of mrtooher/fable-mode.
- SKILL.md
- .gitignore
- BENCHMARK-2026-09-02.md
- EXAMPLE.md
- README.md
- V3-CHANGES.md
- agents/fable-orchestrator.md
- agents/fable-verifier.md
- agents/fable-worker-haiku.md
- agents/fable-worker-sonnet.md
- bench/README.md
- bench/grade.py
- bench/make_fixtures.py
- bench/prompt_base.txt
- bench/prompt_skill.txt
- bench/results.json
- bench/skill_briefing.md
- bench/truthA.json
- bench/truthC.json
- … and 5 more
Open the folder on GitHubat commit a368f94
Compare with similar skills
Fable Mode 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Fable Mode this skillmrtooher/fable-mode | 870 | — | ~1k | Automated safety check: Pass | None | |
| Formax Skill Captureyusifeng/formax | 195 | — | ~530 | Automated safety check: Pass | MIT | |
| Mcaf ML AI Deliverymanagedcode/Storage | 138 | — | ~1k | Automated safety check: Pass | MIT | |
| Gate MCP Skillholon-run/uxc | 116 | — | ~765 | Automated safety check: Pass | MIT | |
| Hive MCP Skillholon-run/uxc | 116 | — | ~971 | Automated safety check: Pass | MIT | |
| Output Validationbenchflow-ai/skillsbench | 1.8k | — | ~462 | Automated safety check: Pass | Apache-2.0 |
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Output Validation
benchflow-ai/skillsbench
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More from mrtooher/fable-mode
Double Check
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Automatic final verification pass on completed deliverables.
Execution Guardrails
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Always-on operational guardrails, model-independent. An agent skill from mrtooher/fable-mode.
Fable Fable
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Run fable-mode execution discipline on Claude Fable 5.1 — the top of the escalation ladder and the strongest staged run available.
Fable Opus
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Run fable-mode execution discipline on Claude Opus — one rung below Fable 5.1 on the escalation ladder.
Fable Haiku
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Fable Sonnet
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Related
Questions about Fable Mode
What does Fable Mode do?
Enforces staged execution discipline on large tasks: a written stage plan, delegation to named fable agents where the runtime supports it, a failable verification check at each stage, and a…. Fable Mode is an agent skill from mrtooher/fable-mode. Enforces staged execution discipline on large tasks: a written stage plan, delegation to named fable agents where the runtime supports it, a failable verification check at each stage, and a skeptical self-review before delivery.
When should I use Fable Mode?
Fable Mode fits situations like: the user explicitly asks (do this thoroughly; deep work mode) OR when the task objectively spans multiple files; multiple sources; multiple sessions.
How do I install Fable Mode in Claude Code?
Run `npx skills add mrtooher/fable-mode --skill fable-mode -a claude-code`. Or copy the skill folder (the mrtooher/fable-mode repository) into .claude/skills/fable-mode in your project. Claude Code loads it when a task matches its description.
How do I install Fable Mode in Codex?
Run `npx skills add mrtooher/fable-mode --skill fable-mode -a codex`. Or copy the skill folder (the mrtooher/fable-mode repository) into .agents/skills/fable-mode in your project. Codex loads it when a task matches its description.
Can I use Fable Mode 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-mode -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-mode, .gemini/skills/fable-mode, .github/skills/fable-mode and .opencode/skills/fable-mode in your project.
What does Fable Mode need to run?
Going by SKILL.md and its folder, Fable Mode needs Python for the scripts in its folder. Our summary lists: Python 3.
Does Fable Mode 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 Mode 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 Mode use?
No licence was found for Fable Mode or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Fable Mode use?
About 1k tokens (SKILL.md is roughly 4.2k 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 Mode?
Skills that share tags, products or a category with Fable Mode: Formax Skill Capture (yusifeng/formax, 195 stars), Mcaf ML AI Delivery (managedcode/Storage, 138 stars), Gate MCP Skill (holon-run/uxc, 116 stars) and Hive MCP Skill (holon-run/uxc, 116 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Fable Mode?
mrtooher (a GitHub user) maintains it in mrtooher/fable-mode, which has 870 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.