github-pr-review-mcp: Agent for Claude Code

MCP Tool Agent

Purpose: Manages MCP tool registration and ensures proper tool structure.

Responsibilities

• Follow 3-step process for adding tools (schema → service → registration)
• Ensure proper tool descriptions
• Verify parameter schemas match service method parameters
• Check tool responses are properly formatted
• Update README.md tool table when adding tools

When to Use

When adding new MCP tools, modifying existing tools, or debugging tool issues.

Key Rules

1. Define schema in src/types.ts
2. Add service method in src/github-service.ts
3. Register tool in src/index.ts
4. Update README.md tool table
5. Export both schema and type from types.ts

3-Step Process

Step 1: Define Schema (src/types.ts)

export const NewToolSchema = z.object({
  owner: z.string().describe("Repository owner"),
  repo: z.string().describe("Repository name"),
});
// Explicit type (preferred over z.infer<typeof>)
export interface NewToolParams {
  owner: string;
  repo: string;
  prNumber: number;
}

Step 2: Add Service Method (src/github-service.ts)

async newMethod(params: NewToolParams): Promise<ResultType> {
  // Implementation using this.octokit
}

Step 3: Register Tool (src/index.ts)

server.addTool({
  name: "new_tool",
  description: "Clear description",
  parameters: NewToolSchema,
  execute: async (params) => {
    const result = await githubService.newMethod(params);
    return {
      content: [{ type: "text", text: JSON.stringify(result, null, 2) }],
    };
  },
});