Qwen3-Coder MCP Server

Instructions

Implementation Reference

• qwen3-mcp-server.js:98-115 (registration)

  Registration of the 'qwen3_code_generate' tool, including name, description, and input schema definition.

  {
    name: "qwen3_code_generate",
    description: "Generate code using Qwen3-Coder",
    inputSchema: {
      type: "object",
      properties: {
        prompt: {
          type: "string",
          description: "Description of what code to generate"
        },
        language: {
          type: "string",
          description: "Target programming language"
        }
      },
      required: ["prompt"]
    }
  },

• qwen3-mcp-server.js:195-204 (handler)

  Handler for 'qwen3_code_generate': constructs a specific prompt based on input arguments and calls the shared Qwen3-Coder function.

        case "qwen3_code_generate":
          prompt = `Generate ${args.language || 'code'} for the following requirement:
  
  ${args.prompt}
  
  ${args.language ? `Please write the code in ${args.language}.` : ''}
  
  Provide clean, well-documented code with explanations.`;
          result = await callQwen3Coder(prompt);
          break;

• qwen3-mcp-server.js:25-56 (helper)

  Shared helper function that spawns Ollama process to run Qwen3-Coder model with the given prompt and returns the output.

  async function callQwen3Coder(prompt, options = {}) {
    return new Promise((resolve, reject) => {
      const ollamaProcess = spawn('ollama', ['run', 'qwen3-coder:30b', prompt], {
        stdio: ['pipe', 'pipe', 'pipe']
      });
  
      let output = '';
      let error = '';
  
      ollamaProcess.stdout.on('data', (data) => {
        output += data.toString();
      });
  
      ollamaProcess.stderr.on('data', (data) => {
        error += data.toString();
      });
  
      ollamaProcess.on('close', (code) => {
        if (code === 0) {
          resolve(output.trim());
        } else {
          reject(new Error(`Ollama process exited with code ${code}: ${error}`));
        }
      });
  
      // Set timeout for long-running requests
      setTimeout(() => {
        ollamaProcess.kill();
        reject(new Error('Request timeout'));
      }, options.timeout || 120000); // 2 minutes default timeout
    });
  }