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OpenAPI MCP Server for analyzing and querying OpenAPI specifications. Provides comprehensive tools for exploring API documentation, schemas, security, paths, and server configurations.
This OpenAPI MCP server demonstrates solid definition quality with 18 well-structured tools covering OpenAPI specification analysis. All tools have clear names following verb_noun conventions (list_, get_, set_), explicit descriptions (most 100+ chars), and proper JSON Schema input definitions with additionalProperties constraints. However, output schemas are not documented, parameter descriptions lack implementation details (format, constraints, examples), and error handling is not visible in the provided code. Tool composition is logical with proper chaining IDs (name parameter used consistently), but some tools have generic descriptions that could be more specific. The server follows good naming conventions and maintains consistency across the API surface.
Retrieve human-readable description and documentation for a specific API endpoint. Provides summary, detailed description, and usage notes. Use this to understand the business purpose and behavior of an endpoint before implementation.
Retrieve comprehensive details for a specific API endpoint including summary, description, operation ID, tags, and metadata. Use this for understanding endpoint purpose and functionality before implementing API calls.
Retrieve parameter definitions for a specific endpoint including path parameters, query parameters, headers, and their validation rules. Essential for constructing valid API requests and understanding required vs optional parameters.
Retrieve request body schema and requirements for endpoints that accept data (POST, PUT, PATCH). Returns content types, required fields, validation rules, and example payloads. Essential for constructing valid request bodies when calling APIs.
Retrieve response definitions for a specific endpoint including status codes, response schemas, headers, and examples. Use this to understand what data structure to expect from API calls and handle different response scenarios (success, error cases).
Output schemas not documented. Tool responses have no specified structure, forcing LLMs to infer result format. This violates pattern:response-shaper and makes chaining tools less reliable.
Inferred effective spec: <=2025-11-25.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-22 | B | 75 | <=2025-11-25 | v2 |
| 2026-03-09 | F | 0 | - | v1 |
Retrieve detailed information for a specific reusable response definition including status codes, content types, schema references, headers, and examples. Use this to understand standard response patterns and error handling across the API.
Retrieve complete JSON Schema definition for a specific data model including all properties, types, constraints, and nested object structures. Use this to understand exact data formats for API requests/responses and generate compatible data structures in your code.
Retrieve comprehensive metadata for a specific schema including type, description, usage context, and relationships to other schemas. Use this to understand the purpose and structure of data models before diving into detailed properties.
Retrieve list of data schemas/models defined in the OpenAPI specification. Returns schema names that can be used as 'schemaName' parameter in other schema tools. Schemas define the structure of request/response data and are referenced throughout the API documentation.
Retrieve detailed property information for a specific schema including field names, data types, validation rules, default values, and examples. Essential for understanding individual fields when constructing objects or validating data structures.
Retrieve detailed configuration for a specific security scheme including authentication type, token locations, OAuth2 flows, scopes, and implementation requirements. Use this to understand how to properly authenticate requests and implement security in your API client.
Retrieve detailed configuration for a specific server including full URL, description, environment variables, and URL templating information. Use this to understand how to construct base URLs for API calls and configure clients for different environments.
Retrieve list of server configurations defined in the OpenAPI specification including base URLs, environments (dev/staging/prod), and descriptions. Returns server URLs that can be used as 'server_url' parameter in get_server_information tool. Essential for determining API endpoints and environments.
Retrieve list of registered OpenAPI specifications. This is typically the first tool to call to discover available APIs. Returns specification names that can be used as 'name' parameter in all other OpenAPI tools (paths, schemas, servers, security, responses).
Retrieve list of API endpoint paths from specified OpenAPI specification. Returns path information including HTTP methods and endpoint patterns. Use the returned 'methodAndPath' values (e.g., 'GET /users/{id}') as input for other path-related tools like get_path_information, get_path_parameters, get_path_responses.
Retrieve list of reusable response definitions from the OpenAPI specification. These are common response patterns (like standard error responses) that are referenced across multiple endpoints. Returns response names that can be used as 'responseName' parameter in get_response_information tool.
Retrieve list of authentication and authorization mechanisms defined in the OpenAPI specification including API keys, OAuth2, Bearer tokens, Basic auth, etc. Returns security scheme names that can be used as 'securitySchemeName' parameter in get_security_scheme_information tool. Essential for understanding how to authenticate API requests.
Load and register OpenAPI specification files into the system database. Use this tool to make OpenAPI specs available for analysis. After successful execution, the registered specification names can be retrieved using 'mcp_openapi_list_openapis' and used in all other tools.
Parameter descriptions lack implementation details. Descriptions state WHAT parameters do but omit constraints, format, limits, and examples. E.g., 'path' parameter in openapi_set_server_info has no example formats shown, no size limits, no validation rules visible.
No error handling guidance in tool descriptions. When a path, schema, or security scheme does not exist, it's unclear what error the tool returns or how the LLM should respond. Violates pattern:recovery-guide.
List tools do not document pagination or result limits. mcp_openapi_list_paths, mcp_openapi_list_responses, mcp_openapi_list_security_schemes, and mcp_openapi_list_application_servers lack page, limit, or offset parameters. If OpenAPI specs have hundreds of items, responses could overflow context. Violates pattern:paginated-result.
Descriptions use bare file path examples ('petstore-api', 'e-commerce-api') without clarifying if these are spec names or file paths. The distinction between 'openapi_set_server_info' (takes path) and 'mcp_openapi_list_openapis' (takes name) could be clearer.