api-to-mcp
MCP ServerFreeGenerates MCP tool code from OpenAPI specs
Capabilities5 decomposed
openapi-to-mcp tool schema transpilation
Medium confidenceParses OpenAPI 3.0/3.1 specifications and generates TypeScript MCP tool definitions by mapping OpenAPI operations to MCP tool schemas. Uses AST-based code generation to produce type-safe tool handlers with parameter validation, request/response transformation, and error handling boilerplate. Supports both JSON and YAML OpenAPI formats with automatic schema dereferencing for $ref resolution.
Directly bridges OpenAPI specifications to MCP tool schemas using spec-aware code generation, automating the mapping of REST endpoints to MCP tool definitions with automatic schema dereferencing and type inference from OpenAPI types
Eliminates manual MCP tool definition writing for REST APIs by automating schema mapping from OpenAPI specs, whereas manual approaches require hand-coding each tool definition and maintaining schema parity with API changes
mcp tool schema validation and type generation
Medium confidenceValidates generated MCP tool schemas against the MCP specification and produces TypeScript type definitions that enforce parameter and response contracts at compile time. Uses JSON Schema validation to ensure OpenAPI-to-MCP mappings are spec-compliant, and generates discriminated union types for polymorphic responses. Includes runtime type guards for request validation.
Generates TypeScript types directly from OpenAPI schemas with MCP-specific validation rules, ensuring generated tool definitions are both spec-compliant and type-safe at compile time through discriminated union types and type guards
Provides compile-time type safety for MCP tool definitions derived from OpenAPI specs, whereas manual type definitions or untyped code generation leaves schema mismatches undetected until runtime
openapi operation-to-mcp tool mapping with parameter transformation
Medium confidenceMaps individual OpenAPI operations (GET, POST, etc.) to MCP tool definitions by transforming OpenAPI parameters (path, query, header, body) into MCP input schemas. Handles parameter flattening, required field inference, default value extraction, and enum constraint mapping. Supports both simple scalar parameters and complex nested object schemas with automatic name normalization for MCP compatibility.
Implements OpenAPI-to-MCP parameter mapping with automatic flattening, constraint inference, and enum handling, using schema-aware transformation rules that preserve semantic meaning across protocol boundaries
Automates parameter schema mapping from OpenAPI to MCP with constraint preservation, whereas manual mapping requires hand-coding each parameter schema and risks divergence from the source API specification
mcp server boilerplate code generation
Medium confidenceGenerates complete, runnable MCP server TypeScript code including tool registration, request routing, error handling, and logging infrastructure. Produces a minimal HTTP/stdio transport layer, tool invocation dispatch logic, and response formatting that conforms to MCP protocol. Includes example implementations for each generated tool with placeholder API client calls ready for integration.
Generates complete, executable MCP server code with tool registration, routing, and protocol handling from OpenAPI specs, producing a working server template that requires only API client integration rather than building from scratch
Provides a fully-wired MCP server scaffold with all tools registered and routed, whereas building from the MCP SDK requires manual tool registration, routing logic, and protocol handling for each server
batch openapi-to-mcp conversion for multi-api integration
Medium confidenceProcesses multiple OpenAPI specifications in a single invocation and generates a unified MCP server with tools from all APIs organized by namespace/tag. Handles namespace collision detection, deduplication of shared schemas across specs, and generates a single tool registry that routes requests to the appropriate API handler. Supports configuration-driven tool grouping and filtering to include/exclude specific endpoints.
Enables batch conversion of multiple OpenAPI specs into a single unified MCP server with automatic namespace organization, schema deduplication, and collision detection, supporting multi-API tool aggregation in one generation pass
Generates a unified multi-API MCP server from multiple OpenAPI specs in one operation with automatic namespacing, whereas running the generator separately for each API requires manual tool registry merging and namespace management
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
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openmcp-core
Core domain types for Model Context Protocol (MCP) tool generation
Best For
- ✓Backend developers building MCP servers from existing REST APIs
- ✓Teams migrating REST-based tool integrations to the Model Context Protocol
- ✓LLM application builders who want to expose multiple APIs as MCP tools without hand-writing schemas
- ✓TypeScript developers building type-safe MCP servers
- ✓Teams with strict type safety requirements in their LLM integration layer
- ✓Projects where schema validation errors need to be caught before runtime
- ✓API providers wanting to expose their REST APIs as MCP tools
- ✓Developers building multi-endpoint MCP servers from comprehensive OpenAPI specs
Known Limitations
- ⚠Requires well-formed, spec-compliant OpenAPI documents — malformed specs may produce invalid MCP schemas
- ⚠Does not auto-generate authentication/credential handling — generated tools require manual auth integration
- ⚠Limited support for complex OpenAPI features like discriminators, oneOf/anyOf polymorphism may require post-generation fixes
- ⚠Generated code is TypeScript only — no Python, Go, or other language output
- ⚠Type generation assumes TypeScript target — no runtime validation for non-TypeScript consumers
- ⚠Complex OpenAPI schemas with deep nesting may produce verbose, hard-to-read TypeScript types
Requirements
Input / Output
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Generates MCP tool code from OpenAPI specs
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