locate_concept

Instructions

Implementation Reference

• pi/extensions/index.ts:246-258 (schema)

  Tool definition for 'locate_concept' including its MCP name, label, description, promptSnippet, and parameter schema (term: string). This is the TypeScript type/schema definition.

  {
    mcpName: "locate_concept",
    label: "Locate Concept",
    description:
      "Find the best entry points for understanding a concept — ranked " +
      "shortlist of key functions, classes, and files to read.",
    promptSnippet:
      "ontomics_locate_concept: find key entry points for a concept",
    parameters: Type.Object({
      term: Type.String({
        description: "Concept to locate (e.g. 'transform')",
      }),
    }),

• pi/extensions/index.ts:362-387 (registration)

  Registration of all tools including 'locate_concept'. The tool is registered via pi.registerTool with the name 'ontomics_locate_concept'. The execute handler delegates to an external ontomics MCP binary via the McpClient class.

  for (const def of toolDefs()) {
    pi.registerTool({
      name: `ontomics_${def.mcpName}`,
      label: def.label,
      description: def.description,
      promptSnippet: def.promptSnippet,
      promptGuidelines: [
        "Use ontomics tools BEFORE grep/glob for semantic codebase questions.",
      ],
      parameters: def.parameters,
      async execute(_toolCallId, params, _signal, onUpdate, _ctx) {
        onUpdate?.({
          content: [{ type: "text", text: `Querying ontomics: ${def.mcpName}...` }],
        });
        try {
          const mcp = await getClient();
          const text = await mcp.callTool(def.mcpName, cleanArgs(params));
          return { content: [{ type: "text", text }] };
        } catch (err) {
          throw new Error(
            `ontomics ${def.mcpName} failed: ${err instanceof Error ? err.message : String(err)}`,
          );
        }
      },
    });
  }

• pi/extensions/index.ts:372-385 (handler)

  Generic execute handler for all tools (including locate_concept). Sends a JSON-RPC 'tools/call' request to the external ontomics binary over stdio, passing the tool name 'locate_concept' and cleaned parameters.

  async execute(_toolCallId, params, _signal, onUpdate, _ctx) {
    onUpdate?.({
      content: [{ type: "text", text: `Querying ontomics: ${def.mcpName}...` }],
    });
    try {
      const mcp = await getClient();
      const text = await mcp.callTool(def.mcpName, cleanArgs(params));
      return { content: [{ type: "text", text }] };
    } catch (err) {
      throw new Error(
        `ontomics ${def.mcpName} failed: ${err instanceof Error ? err.message : String(err)}`,
      );
    }
  },

• pi/extensions/index.ts:44-54 (helper)

  McpClient.callTool method that performs the actual JSON-RPC call to the ontomics binary. This is what the execute handler uses to invoke 'locate_concept' on the Rust backend.

  async callTool(
    name: string,
    args: Record<string, unknown>,
  ): Promise<string> {
    const result = (await this.request("tools/call", {
      name,
      arguments: args,
    })) as { content?: Array<{ text?: string }> };
    const text = result.content?.[0]?.text ?? JSON.stringify(result);
    return text;
  }