[REQ] New generator type for MCP server generation

Is your feature request related to a problem? Please describe.

I have OpenAPI specs for my APIs, but to use them with AI tools (Claude, ChatGPT, etc.) I need to manually write MCP servers. This means duplicating all my API definitions and maintaining two codebases.

Describe the solution you'd like

Add a Spring Boot MCP Server generator to OpenAPI Generator.

Input: My existing OpenAPI spec
Output: A working Spring Boot MCP server that AI tools can connect to

Example - from this OpenAPI operation:

/pets:
  get:
    summary: List all pets
    parameters:
      - name: limit
        in: query
        schema:
          type: integer

Generate this Spring Boot code:

@Service
public class PetStoreService {
    
    @McpTool(name = "list_pets", description = "List all pets")
    public List<Pet> listPets(
        @McpToolParam(description = "Maximum number of pets to return") Integer limit
    ) {
        // Call my existing API
        return restTemplate.getForObject("/pets?limit=" + limit, Pet[].class);
    }
}

@Configuration  
public class McpConfig {
    @Bean
    public ToolCallbackProvider tools(PetStoreService service) {
        return MethodToolCallbackProvider.from(service);
    }
}

Then I can connect Claude Desktop or VS Code to my API with zero manual work.

Describe alternatives you've considered

• Manual coding: Writing all the @McpTool methods by hand (tedious and error-prone)
• custom generator: write one myself
• existing implementations: e.g. harsha-iiiv/openapi-mcp-generator OR rmcp-openapi

Additional context

MCP (Model Context Protocol) is how AI tools connect to external APIs. Spring Boot already has full MCP support through Spring AI. This generator would just convert OpenAPI specs into the Spring Boot MCP format automatically.

Every popular language probably needs this - I'm focusing on Spring Boot because that's what I use, but Python/FastAPI, Node.js, etc. would benefit too.

No repository files, tests, or entry points are named. Start by locating existing server generator implementations and the Spring Boot generation path, then review how their templates and tests are organized. Done means an OpenAPI spec can generate a working Spring Boot MCP server with tool definitions for its operations.