fable5-skill-kit 1.0.2

Discipline skills for Claude — built by Fable 5, usable by any model

fable5-skill-kit

Discipline skills for Claude — built by Fable 5, usable by any model.

26 universal skills + 81 domain skills across 17 domains. The master skill /fable auto-detects your domain and activates the right discipline — invoke it once at session start and it handles the rest.

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What is this

Every skill is a set of operating instructions: principles, verification gates, and procedures for a specific type of work. They don't change what Claude can do — they change how rigorously it does it.

• Universal skills apply to any domain: adversarial disproof, evidence reasoning, plan gating, code investigation, root cause analysis, and more.
• Domain skills apply the right discipline for specific work: backtest rigor for trading, threat modeling for security, mom-test compliance for startups, and so on across 17 domains.
• /fable is the master router: reads your context, detects the domain, activates the right principles and gates, and lists which skills to use next.
• /fable-mode adds maximum investigation rigor on top: evidence anchoring, hypothesis-before-read, adversarial self-check, coverage accounting.

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Install

Claude Code

pip install fable5-skill-kit

Copies all skills into ~/.claude/skills/. Restart Claude Code, then use any skill with /skill-name in conversation.

claude.ai web

Skills are added one file at a time via Settings → Customize → Skills → Add.

To get all 17 domains in one step: upload skills/fable/SKILL.md. The master router is self-contained — it embeds the principles and gates for every domain and routes automatically. You do not need to upload individual domain skills unless you want them available as standalone commands.

To add a specific skill: upload its SKILL.md from skills/ or domains/<name>/skills/<skill-name>/.

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Skill Index

Start here

Skill	What it does
/fable	Detects domain from context, activates principles + gates + skill list for that domain
/fable-mode	Maximum investigation rigor: evidence anchoring, hypothesis loops, adversarial self-check
/plan-gate	Gates any implementation: GOAL → CURRENT STATE → STEPS → RISKS → stop for approval

Universal skills

Skill	What it does
/adversarial-disproof	Three-level disproof of any finding before shipping
/evidence-reasoning	Source hierarchy enforcement — cite primary, flag inference
/code-investigation	Cartography-first codebase investigation
/root-cause-first	Class-level root cause, not instance-level patches
/assumption-flagging	Surface hidden assumptions before they become bugs
/scope-fence	Explicit in/out-of-scope declaration before any task
/uncertainty-handling	Calibrated uncertainty — confident where earned, explicit where not
/coverage-accounting	Audit what was checked vs skipped
/security-threat-modeling	STRIDE threat enumeration + residual risk register
/hypothesis-led	Answer-first reasoning: form a hypothesis, then verify
/iterative-refinement	Named failure modes per iteration, not generic "improve"

Domain skills

Domain	Skills
software-engineering	/debug-isolator /refactor-gate /api-contract-verifier + 2 more
trading-finance	/backtest-discipline /execution-analysis /risk-first-sizing /regime-awareness /trade-journaling
architecture-systems	/adr-writer /capacity-planner /failure-mode-mapper /observability-designer /migration-strategist
marketing-sales	/icp-sharpener /channel-attribution-auditor /copy-testing-loop
legal-compliance	/jurisdiction-first /contract-risk-scan /compliance-gap-mapper
creative-media	/brief-sharpener /consistency-enforcer /iterative-image-refiner
data-science-ml	/leakage-detector /eval-metric-alignment /drift-monitor-designer
devops-infrastructure	/blast-radius-estimator /runbook-writer /cost-anomaly-scanner
product-management	/hypothesis-prioritizer /north-star-aligner /stakeholder-no-framer
research-academic	/source-hierarchy-enforcer /harking-detector /so-what-extractor
operations-supply-chain	/bullwhip-detector /process-reality-checker /sop-writer
business-strategy	/mece-decomposer /so-what-enforcer /scenario-planner
personal-productivity	/context-switch-minimizer /decision-journal-writer /weekly-review-runner
founder-entrepreneur	/momtest-auditor /term-sheet-analyzer /cofounder-agreement-checklist + 3 more
startup-growth	/pmf-signal-reader /growth-model-selector /nrr-health-checker
security-engineering	/threat-modeler /secure-code-reviewer /vulnerability-triager /dependency-auditor /incident-responder
healthcare-life-sciences	Domain pack + verification gates included; dedicated skills coming soon

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Usage patterns

Session start, any domain:

/fable

Reads the conversation, detects the domain, outputs the relevant principles and gates. Work proceeds under that discipline.

Hard investigation, maximum rigor:

/fable
/fable-mode

Domain routing + behavioral discipline. Use when mistakes are costly.

Gate an implementation before writing code:

/plan-gate

Produces GOAL → CURRENT STATE → STEPS → OUT OF SCOPE → RISKS → ASSUMPTIONS. Stops for approval before any file is written.

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Repository structure

fable5-skill-kit/
├── skills/                     # 26 universal + router skills
│   ├── fable/SKILL.md          # Master router — start here
│   ├── fable-mode/SKILL.md     # Behavioral rigor layer
│   ├── plan-gate/SKILL.md      # Implementation gating
│   └── ...
├── domains/                    # 17 domain packs
│   ├── software-engineering/
│   │   ├── domain_pack.md
│   │   ├── verification_gates.md
│   │   └── skills/
│   └── ...
├── core/                       # Framework files
├── install.ps1                 # Windows install
└── install.sh                  # Mac/Linux install

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Notes

• Skills are opt-in — they only activate when invoked. No effect on default model behavior.
• Works with any Claude model: Haiku, Sonnet, Opus, Fable.
• Healthcare dedicated skills are pending a follow-up session to meet the evidence standards that domain requires.