feat: Add new Microsoft based MCP server for OpenAPI using official tools

[pomianowski]

MCP Server Information

Server Name: mcp/openapi
Repository URL: https://github.com/lepoco/openapi.client
Brief Description:
mcp/openapi is a modern OpenAPI toolkit built using the official Microsoft OpenAPI.NET library, combined with ModelContextProtocol SDK. Unlike existing solutions, this server supports advanced introspection and manipulation of OpenAPI specifications.

README: https://github.com/lepoco/openapi.client/blob/main/README.md
LICENSE (MIT): https://github.com/lepoco/openapi.client/blob/main/LICENSE

It can:

• Fetch OpenAPI documents from remote sources
• Analyze and detect inconsistencies or schema issues
• Generate structured curl commands

Currently provided tools:

Tool	Description
get_list_of_operations	Lists all operation IDs from a given OpenAPI or Swagger JSON document.
get_known_responses	Lists all known responses for given operation IDs from a OpenAPI or Swagger JSON document.
validate_document	Validates the structure and syntax of an OpenAPI JSON document.
generate_curl_command	Generates a cURL command for a specific operation ID.
create_csharp_snippet	Creates a simple HTTP request for a given operation ID.

This implementation aims to improve reliability and extensibility by aligning closely with the latest OpenAPI standards and Microsoft's maintained tooling.

Basic Requirements

• Open Source: Uses acceptable license (Apache-2.0, MIT, BSD-2-Clause, BSD-3-Clause or other permissive license)
• MCP Compliant: Implements MCP API specification
• Active Development: Recent commits and maintained
• Docker Artifact: Dockerfile
• Documentation: Basic README and setup instructions
• Security Contact: Method for reporting security issues

Submitter Checklist

• This server meets the basic requirements listed above
• I understand this will undergo automated and manual review.
• I have tested the MCP Server using task validate -- --name SERVER_NAME
• I have built the MCP Server using task build -- --tools SERVER_NAME