Tool Creator

Create executable tool files in .claude/tools/<category>/. Tools are organized into categories like cli, analysis, validation, integrations, etc.

Step 0: Check for Existing Tool

Before creating, check if tool already exists:

find .claude/tools/ -name "<tool-name>.*" -type f

If EXISTS → use Read to inspect the current tool file, then Edit to apply changes directly. Run the post-creation integration steps (Step 4) after updating.

If NEW → continue with Step 0.5.

Step 0.5: Companion Check

Before proceeding with creation, run the ecosystem companion check:

1. Use companion-check.cjs from .claude/lib/creators/companion-check.cjs
2. Call checkCompanions("tool", "{tool-name}") to identify companion artifacts
3. Review the companion checklist — note which required/recommended companions are missing
4. Plan to create or verify missing companions after this artifact is complete
5. Include companion findings in post-creation integration notes

This step is informational (does not block creation) but ensures the full artifact ecosystem is considered.

When to Use

• Creating reusable command-line utilities
• Building analysis or validation scripts
• Implementing framework automation tools
• Adding workflow integration utilities

Tool File Format

Tools are CommonJS or ESM modules with:

#!/usr/bin/env node
/**
 * Tool Name - Brief description
 *
 * Usage:
 *   node .claude/tools/<category>/<tool-name>.cjs [options]
 *
 * Options:
 *   --help     Show help
 *   --option   Description
 */

const main = async () => {
  // Tool implementation
};

if (require.main === module) {
  main().catch(console.error);
}

module.exports = { main };

Tool Categories

Creation Workflow

Step 1: Validate Inputs

// Validate tool name (lowercase, hyphens, no spaces)
const toolName = args.name.toLowerCase().replace(/[^a-z0-9-]/g, '-');

// Validate category exists
const validCategories = [
  'cli',
  'analysis',
  'validation',
  'integrations',
  'maintenance',
  'optimization',
  'runtime',
  'visualization',
  'workflow',
  'gates',
  'context',
];

if (!validCategories.includes(args.category)) {
  throw new Error(`Invalid category. Must be one of: ${validCategories.join(', ')}`);
}

Step 2: Create Tool File

const toolPath = `.claude/tools/${args.category}/${toolName}.cjs`;

// Create tool directory if it doesn't exist
await mkdir(`.claude/tools/${args.category}`, { recursive: true });

// Generate tool content
const content = `#!/usr/bin/env node
/**
 * ${toolName.replace(/-/g, ' ').replace(/\b\w/g, l => l.toUpperCase())} - ${args.description || 'Tool description'}
 *
 * Usage:
 *   node .claude/tools/${args.category}/${toolName}.cjs [options]
 *
 * Options:
 *   --help     Show this help message
 */

${args.implementation}

if (require.main === module) {
  main().catch(console.error);
}

module.exports = { main };
`;

await writeFile(toolPath, content);

// Make executable (Unix-like systems)
if (process.platform !== 'win32') {
  await chmod(toolPath, '755');
}

Step 3: Update Tool Catalog

const catalogPath = '.claude/context/artifacts/catalogs/tool-catalog.md';

// Add entry to catalog under appropriate category
const newEntry = `| ${toolName} | ${args.description} | .claude/tools/${args.category}/${toolName}.cjs | active |`;

// Insert into catalog preserving category structure

Step 4: Run Post-Creation Integration

const {
  runIntegrationChecklist,
  queueCrossCreatorReview,
} = require('.claude/lib/creator-commons.cjs');

await runIntegrationChecklist('tool', toolPath);
await queueCrossCreatorReview('tool', toolPath, {
  artifactName: toolName,
  createdBy: 'tool-creator',
  category: args.category,
});

Post-Creation Integration

After tool creation, run integration checklist:

const {
  runIntegrationChecklist,
  queueCrossCreatorReview,
} = require('.claude/lib/creator-commons.cjs');

// 1. Run integration checklist
const result = await runIntegrationChecklist('tool', '.claude/tools/<category>/<tool-name>.cjs');

// 2. Queue cross-creator review
await queueCrossCreatorReview('tool', '.claude/tools/<category>/<tool-name>.cjs', {
  artifactName: '<tool-name>',
  createdBy: 'tool-creator',
  category: '<category>',
});

// 3. Review impact report
// Check result.mustHave for failures - address before marking complete

Integration verification:

• Tool added to tool-catalog.md under correct category
• Tool file is executable (Unix) or runnable (Windows)
• Tool has help text and usage examples
• Tool passes basic smoke test

Usage Examples

Create Validation Tool

Skill({
  skill: 'tool-creator',
  args: `--name schema-validator --category validation --implementation "
const validateSchema = async () => {
  console.log('Validating schema...');
};

const main = async () => {
  await validateSchema();
};
"`,
});

Create Analysis Tool

Skill({
  skill: 'tool-creator',
  args: `--name complexity-analyzer --category analysis --implementation "
const analyzeComplexity = async (filePath) => {
  console.log('Analyzing complexity for:', filePath);
};

const main = async () => {
  const [,, filePath] = process.argv;
  await analyzeComplexity(filePath);
};
"`,
});

Related Skills

• skill-creator – Create skills that invoke tools
• hook-creator – Create pre/post hooks that wrap tool execution

Memory Protocol (MANDATORY)

Before starting: Read .claude/context/memory/learnings.md

After completing:

• New tool pattern → .claude/context/memory/learnings.md
• Tool creation issue → .claude/context/memory/issues.md
• Category decision → .claude/context/memory/decisions.md

ASSUME INTERRUPTION: If it’s not in memory, it didn’t happen.

Cross-Reference: Creator Ecosystem

This skill is part of the Creator Ecosystem. When research uncovers gaps, trigger the appropriate companion creator:

Ecosystem Alignment Contract (MANDATORY)

This creator skill is part of a coordinated creator ecosystem. Any artifact created here must align with and validate against related creators:

• agent-creator for ownership and execution paths
• skill-creator for capability packaging and assignment
• tool-creator for executable automation surfaces
• hook-creator for enforcement and guardrails
• rule-creator and semgrep-rule-creator for policy and static checks
• template-creator for standardized scaffolds
• workflow-creator for orchestration and phase gating
• command-creator for user/operator command UX

Cross-Creator Handshake (Required)

Before completion, verify all relevant handshakes:

1. Artifact route exists in .claude/CLAUDE.md and related routing docs.
2. Discovery/registry entries are updated (catalog/index/registry as applicable).
3. Companion artifacts are created or explicitly waived with reason.
4. validate-integration.cjs passes for the created artifact.
5. Skill index is regenerated when skill metadata changes.

Research Gate (Exa + arXiv — BOTH MANDATORY)

For new patterns, templates, or workflows, research is mandatory:

1. Use Exa for implementation and ecosystem patterns:
   • mcp__Exa__web_search_exa({ query: '<topic> 2025 best practices' })
   • mcp__Exa__get_code_context_exa({ query: '<topic> implementation examples' })
2. Search arXiv for academic research (mandatory for AI/ML, agents, evaluation, orchestration, memory/RAG, security):
   • Via Exa: mcp__Exa__web_search_exa({ query: 'site:arxiv.org <topic> 2024 2025' })
   • Direct API: WebFetch({ url: 'https://arxiv.org/search/?query=<topic>&searchtype=all&start=0' })
3. Record decisions, constraints, and non-goals in artifact references/docs.
4. Keep updates minimal and avoid overengineering.

arXiv is mandatory (not fallback) when topic involves: AI agents, LLM evaluation, orchestration, memory/RAG, security, static analysis, or any emerging methodology.

Regression-Safe Delivery

• Follow strict RED -> GREEN -> REFACTOR for behavior changes.
• Run targeted tests for changed modules.
• Run lint/format on changed files.
• Keep commits scoped by concern (logic/docs/generated artifacts).