povvo/claudikins-tool-executor/te-guide

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Use this skill when users ask "how does tool executor work", "how to use execute_code", "workspace API", "MCP client examples", "search_tools examples", "context-efficient patterns", or need guidance writing code for the Tool Executor sandbox.

Install

npx vskill@latest install povvo/claudikins-tool-executor/te-guide

SKILL.md

The same SKILL.md was published earlier as elb-pr/claudikins-tool-executor/te-guide.

Claudikins Tool Executor Guide

The Tool Executor wraps 7 MCP servers into 3 context-efficient tools. Master this workflow to reduce token consumption from ~50k to ~1.1k.

The Three-Tool Workflow

search_tools → get_tool_schema → execute_code
Step 1: Search for Tools

Find relevant tools with semantic search:

typescript
const result = await mcp__tool-executor__search_tools({
query: "generate diagram",
limit: 5
});
// Returns: { results: [{ name, server, description }], source, has_more }

Search tips:

  • Use natural language: "create flowchart", "fetch webpage", "AI reasoning"
  • Results are slim - just name, server, one-liner
  • Use offset for pagination when has_more is true
Step 2: Get Full Schema

Before calling a tool, get its complete specification:

typescript
const schema = await mcp__tool-executor__get_tool_schema({
name: "gemini_generateContent"
});
// Returns: { name, server, description, inputSchema, example, notes }

Why this step matters:

  • inputSchema shows all parameters, types, and required fields
  • example shows working code you can adapt
  • notes contains gotchas and tips
Step 3: Execute Code

Run TypeScript in the sandbox with pre-connected MCP clients:

typescript
const result = await mcp__tool-executor__execute_code({
code: `
const response = await gemini.gemini_generateContent({
prompt: "Create a flowchart description for user authentication"
});
console.log("Generated:", response._savedTo || "inline");
`,
timeout: 30000
});

Available MCP Clients

All clients are pre-connected and available as globals:

ClientPurpose
serenaSemantic code search (REQUIRED - cannot be removed)
context7Library documentation lookup
geminiAI model queries, image generation, diagrams
notebooklmResearch and notes
shadcnUI component generation
apifyWeb scraping
sequentialThinkingReasoning chains
Client Usage Pattern
typescript
// All clients use the same pattern:
const result = await clientName.tool_name({ param: value });
// Examples:
await serena.find_symbol({ name_path: "MyClass" });
await gemini.query_gemini({ prompt: "Explain this code" });
await context7.resolve_library_id({ libraryName: "react" });

Workspace API

Persistent file storage scoped to ./workspace/. All paths are protected against traversal.

Text Operations
typescript
await workspace.write("notes.txt", "Hello world");
const content = await workspace.read("notes.txt");
await workspace.append("log.txt", "New line\n");
await workspace.delete("temp.txt");
JSON Operations
typescript
await workspace.writeJSON("data.json", { key: "value" });
const data = await workspace.readJSON("data.json");
Binary Operations
typescript
await workspace.writeBuffer("image.png", buffer);
const buffer = await workspace.readBuffer("image.png");
Directory Operations
typescript
const files = await workspace.list("subdir");
const matches = await workspace.glob("**/*.json");
await workspace.mkdir("nested/path");
Metadata
typescript
const exists = await workspace.exists("file.txt");
const stats = await workspace.stat("file.txt");
// stats: { size: number, mtime: Date, isDir: boolean }
MCP Results Cleanup
typescript
// Clean up auto-saved MCP responses older than 1 hour
const deleted = await workspace.cleanupMcpResults();

Context-Efficient Patterns

Auto-Save for Large Responses

MCP responses over 200 characters are automatically saved to workspace:

typescript
const response = await context7.get_library_docs({
context7CompatibleLibraryID: "/react/react"
});
// If large, response becomes:
// { _savedTo: "mcp-results/1234.json", _size: 5000, _preview: "...", _hint: "..." }
// Read full result when needed:
const full = await workspace.readJSON(response._savedTo);
Console Output Summarisation

Total console output over 500 characters is summarised. Keep logs concise:

typescript
// Good - concise logs
console.log("Created 5 files");
console.log("Done");
// Avoid - verbose output that gets truncated
console.log(JSON.stringify(largeObject, null, 2));
Batch Operations

Minimise round-trips by batching work:

typescript
// Good - single execution with multiple operations
await mcp__tool-executor__execute_code({
code: `
const [lib1, lib2] = await Promise.all([
context7.resolve_library_id({ libraryName: "react" }),
context7.resolve_library_id({ libraryName: "vue" })
]);
console.log("Resolved both");
`
});

Common Patterns

Generate Content with Gemini
typescript
const response = await gemini.gemini_generateContent({
prompt: `Create a detailed flowchart description:
- User submits request
- Search for relevant tools
- Get tool schema
- Execute code in sandbox
`
});
await workspace.write("flowchart.md", response.content[0].text);
console.log("Saved flowchart.md");
Search Codebase with Serena
typescript
const results = await serena.find_symbol({ name_path: "executeCode" });
console.log("Found:", results.content[0].text);
AI-Assisted Analysis
typescript
const code = await workspace.read("analysis-target.ts");
const analysis = await gemini.query_gemini({
prompt: `Analyse this code for potential issues:\n\n${code}`
});
await workspace.write("analysis.md", analysis.content[0].text);

Error Handling

Errors in execute_code return structured results:

typescript
const result = await mcp__tool-executor__execute_code({
code: `throw new Error("Something broke")`
});
// result: { logs: [...], error: "Something broke", stack: "..." }

Common errors:

  • Timeout: Increase timeout parameter or chunk work
  • MCP connection failed: Check server is configured, try later
  • Path traversal blocked: Workspace paths must stay within ./workspace/

Source Code Reference

For implementation details, see:

  • ${CLAUDE_PLUGIN_ROOT}/src/sandbox/runtime.ts - Execution engine
  • ${CLAUDE_PLUGIN_ROOT}/src/sandbox/workspace.ts - Workspace API
  • ${CLAUDE_PLUGIN_ROOT}/src/sandbox/clients.ts - MCP client management
  • ${CLAUDE_PLUGIN_ROOT}/src/search.ts - Tool search implementation

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