"""FastMCP server implementation for OpenAPI integration.""" from __future__ import annotations import enum import json import re import warnings from collections import Counter from collections.abc import Callable from dataclasses import dataclass, field from re import Pattern from typing import TYPE_CHECKING, Any, Literal import httpx from mcp.types import EmbeddedResource, ImageContent, TextContent, ToolAnnotations from pydantic.networks import AnyUrl from fastmcp.exceptions import ToolError from fastmcp.resources import Resource, ResourceTemplate from fastmcp.server.dependencies import get_http_headers from fastmcp.server.server import FastMCP from fastmcp.tools.tool import Tool, _convert_to_content from fastmcp.utilities import openapi from fastmcp.utilities.logging import get_logger from fastmcp.utilities.openapi import ( HTTPRoute, _combine_schemas, format_description_with_responses, ) if TYPE_CHECKING: from fastmcp.server import Context logger = get_logger(__name__) HttpMethod = Literal["GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS", "HEAD"] def _slugify(text: str) -> str: """ Convert text to a URL-friendly slug format that only contains lowercase letters, uppercase letters, numbers, and underscores. """ if not text: return "" # Replace spaces and common separators with underscores slug = re.sub(r"[\s\-\.]+", "_", text) # Remove non-alphanumeric characters except underscores slug = re.sub(r"[^a-zA-Z0-9_]", "", slug) # Remove multiple consecutive underscores slug = re.sub(r"_+", "_", slug) # Remove leading/trailing underscores slug = slug.strip("_") return slug # Type definitions for the mapping functions RouteMapFn = Callable[[HTTPRoute, "MCPType"], "MCPType | None"] ComponentFn = Callable[ [ HTTPRoute, "OpenAPITool | OpenAPIResource | OpenAPIResourceTemplate", ], None, ] class MCPType(enum.Enum): """Type of FastMCP component to create from a route. Enum values: TOOL: Convert the route to a callable Tool RESOURCE: Convert the route to a Resource (typically GET endpoints) RESOURCE_TEMPLATE: Convert the route to a ResourceTemplate (typically GET with path params) EXCLUDE: Exclude the route from being converted to any MCP component IGNORE: Deprecated, use EXCLUDE instead """ TOOL = "TOOL" RESOURCE = "RESOURCE" RESOURCE_TEMPLATE = "RESOURCE_TEMPLATE" # PROMPT = "PROMPT" EXCLUDE = "EXCLUDE" # Keep RouteType as an alias to MCPType for backward compatibility class RouteType(enum.Enum): """ Deprecated: Use MCPType instead. This enum is kept for backward compatibility and will be removed in a future version. """ TOOL = "TOOL" RESOURCE = "RESOURCE" RESOURCE_TEMPLATE = "RESOURCE_TEMPLATE" IGNORE = "IGNORE" @dataclass(kw_only=True) class RouteMap: """Mapping configuration for HTTP routes to FastMCP component types.""" methods: list[HttpMethod] | Literal["*"] = field(default="*") pattern: Pattern[str] | str = field(default=r".*") route_type: RouteType | MCPType | None = field(default=None) tags: set[str] = field( default_factory=set, metadata={"description": "A set of tags to match. All tags must match."}, ) mcp_type: MCPType | None = field( default=None, metadata={"description": "The type of FastMCP component to create."}, ) mcp_tags: set[str] = field( default_factory=set, metadata={ "description": "A set of tags to apply to the generated FastMCP component." }, ) def __post_init__(self): """Validate and process the route map after initialization.""" # Handle backward compatibility for route_type, deprecated in 2.5.0 if self.mcp_type is None and self.route_type is not None: warnings.warn( "The 'route_type' parameter is deprecated and will be removed in a future version. " "Use 'mcp_type' instead with the appropriate MCPType value.", DeprecationWarning, stacklevel=2, ) if isinstance(self.route_type, RouteType): warnings.warn( "The RouteType class is deprecated and will be removed in a future version. " "Use MCPType instead.", DeprecationWarning, stacklevel=2, ) # Check for the deprecated IGNORE value if self.route_type == RouteType.IGNORE: warnings.warn( "RouteType.IGNORE is deprecated and will be removed in a future version. " "Use MCPType.EXCLUDE instead.", DeprecationWarning, stacklevel=2, ) # Convert from RouteType to MCPType if needed if isinstance(self.route_type, RouteType): route_type_name = self.route_type.name if route_type_name == "IGNORE": route_type_name = "EXCLUDE" self.mcp_type = getattr(MCPType, route_type_name) else: self.mcp_type = self.route_type elif self.mcp_type is None: raise ValueError("`mcp_type` must be provided") # Set route_type to match mcp_type for backward compatibility if self.route_type is None: self.route_type = self.mcp_type # Default route mapping: all routes become tools. # Users can provide custom route_maps to override this behavior. DEFAULT_ROUTE_MAPPINGS = [ RouteMap(mcp_type=MCPType.TOOL), ] def _determine_route_type( route: openapi.HTTPRoute, mappings: list[RouteMap], ) -> RouteMap: """ Determines the FastMCP component type based on the route and mappings. Args: route: HTTPRoute object mappings: List of RouteMap objects in priority order Returns: The RouteMap that matches the route, or a catchall "Tool" RouteMap if no match is found. """ # Check mappings in priority order (first match wins) for route_map in mappings: # Check if the HTTP method matches if route_map.methods == "*" or route.method in route_map.methods: # Handle both string patterns and compiled Pattern objects if isinstance(route_map.pattern, Pattern): pattern_matches = route_map.pattern.search(route.path) else: pattern_matches = re.search(route_map.pattern, route.path) if pattern_matches: # Check if tags match (if specified) # If route_map.tags is empty, tags are not matched # If route_map.tags is non-empty, all tags must be present in route.tags (AND condition) if route_map.tags: route_tags_set = set(route.tags or []) if not route_map.tags.issubset(route_tags_set): # Tags don't match, continue to next mapping continue # We know mcp_type is not None here due to post_init validation assert route_map.mcp_type is not None logger.debug( f"Route {route.method} {route.path} matched mapping to {route_map.mcp_type.name}" ) return route_map # Default fallback return RouteMap(mcp_type=MCPType.TOOL) class OpenAPITool(Tool): """Tool implementation for OpenAPI endpoints.""" def __init__( self, client: httpx.AsyncClient, route: openapi.HTTPRoute, name: str, description: str, parameters: dict[str, Any], tags: set[str] | None = None, timeout: float | None = None, annotations: ToolAnnotations | None = None, serializer: Callable[[Any], str] | None = None, ): super().__init__( name=name, description=description, parameters=parameters, tags=tags or set(), annotations=annotations, serializer=serializer, ) self._client = client self._route = route self._timeout = timeout def __repr__(self) -> str: """Custom representation to prevent recursion errors when printing.""" return f"OpenAPITool(name={self.name!r}, method={self._route.method}, path={self._route.path})" async def run( self, arguments: dict[str, Any] ) -> list[TextContent | ImageContent | EmbeddedResource]: """Execute the HTTP request based on the route configuration.""" # Prepare URL path = self._route.path # Replace path parameters with values from kwargs # Path parameters should never be None as they're typically required # but we'll handle that case anyway path_params = { p.name: arguments.get(p.name) for p in self._route.parameters if p.location == "path" and p.name in arguments and arguments.get(p.name) is not None } # Ensure all path parameters are provided required_path_params = { p.name for p in self._route.parameters if p.location == "path" and p.required } missing_params = required_path_params - path_params.keys() if missing_params: raise ToolError(f"Missing required path parameters: {missing_params}") for param_name, param_value in path_params.items(): # Handle array path parameters with style 'simple' (comma-separated) # In OpenAPI, 'simple' is the default style for path parameters param_info = next( (p for p in self._route.parameters if p.name == param_name), None ) if param_info and isinstance(param_value, list): # Check if schema indicates an array type schema = param_info.schema_ is_array = schema.get("type") == "array" if is_array: # Format array values as comma-separated string # This follows the OpenAPI 'simple' style (default for path) if all( isinstance(item, str | int | float | bool) for item in param_value ): # Handle simple array types path = path.replace( f"{{{param_name}}}", ",".join(str(v) for v in param_value) ) else: # Handle complex array types (containing objects/dicts) try: # Try to create a simple representation without Python syntax artifacts formatted_parts = [] for item in param_value: if isinstance(item, dict): # For objects, serialize key-value pairs item_parts = [] for k, v in item.items(): item_parts.append(f"{k}:{v}") formatted_parts.append(".".join(item_parts)) else: # Fallback for other complex types formatted_parts.append(str(item)) # Join parts with commas formatted_value = ",".join(formatted_parts) path = path.replace(f"{{{param_name}}}", formatted_value) except Exception as e: logger.warning( f"Failed to format complex array path parameter '{param_name}': {e}" ) # Fallback to string representation, but remove Python syntax artifacts str_value = ( str(param_value) .replace("[", "") .replace("]", "") .replace("'", "") .replace('"', "") ) path = path.replace(f"{{{param_name}}}", str_value) continue # Default handling for non-array parameters or non-array schemas path = path.replace(f"{{{param_name}}}", str(param_value)) # Prepare query parameters - filter out None and empty strings query_params = {} for p in self._route.parameters: if ( p.location == "query" and p.name in arguments and arguments.get(p.name) is not None and arguments.get(p.name) != "" ): param_value = arguments.get(p.name) # Format array query parameters as comma-separated strings # following OpenAPI form style (default for query parameters) if isinstance(param_value, list) and p.schema_.get("type") == "array": # Get explode parameter from schema, default is True for query parameters # If explode is True, the array is serialized as separate parameters # If explode is False, the array is serialized as a comma-separated string explode = p.schema_.get("explode", True) if explode: # When explode=True, we pass the array directly, which HTTPX will serialize # as multiple parameters with the same name query_params[p.name] = param_value else: # For arrays of simple types (strings, numbers, etc.), join with commas if all( isinstance(item, str | int | float | bool) for item in param_value ): query_params[p.name] = ",".join(str(v) for v in param_value) else: # For complex types, try to create a simpler representation try: # Try to create a simple string representation formatted_parts = [] for item in param_value: if isinstance(item, dict): # For objects, serialize key-value pairs item_parts = [] for k, v in item.items(): item_parts.append(f"{k}:{v}") formatted_parts.append(".".join(item_parts)) else: formatted_parts.append(str(item)) query_params[p.name] = ",".join(formatted_parts) except Exception as e: logger.warning( f"Failed to format complex array query parameter '{p.name}': {e}" ) # Fallback to string representation query_params[p.name] = param_value else: # Non-array parameters are passed as is query_params[p.name] = param_value # Prepare headers - fix typing by ensuring all values are strings headers = {} # Start with OpenAPI-defined header parameters openapi_headers = {} for p in self._route.parameters: if ( p.location == "header" and p.name in arguments and arguments[p.name] is not None ): openapi_headers[p.name.lower()] = str(arguments[p.name]) headers.update(openapi_headers) # Add headers from the current MCP client HTTP request (these take precedence) mcp_headers = get_http_headers() headers.update(mcp_headers) # Prepare request body json_data = None if self._route.request_body and self._route.request_body.content_schema: # Extract body parameters, excluding path/query/header params that were already used path_query_header_params = { p.name for p in self._route.parameters if p.location in ("path", "query", "header") } body_params = { k: v for k, v in arguments.items() if k not in path_query_header_params and k != "context" } if body_params: json_data = body_params # Execute the request try: response = await self._client.request( method=self._route.method, url=path, params=query_params, headers=headers, json=json_data, timeout=self._timeout, ) # Raise for 4xx/5xx responses response.raise_for_status() # Try to parse as JSON first try: result = response.json() except (json.JSONDecodeError, ValueError): # Return text content if not JSON result = response.text return _convert_to_content(result) except httpx.HTTPStatusError as e: # Handle HTTP errors (4xx, 5xx) error_message = ( f"HTTP error {e.response.status_code}: {e.response.reason_phrase}" ) try: error_data = e.response.json() error_message += f" - {error_data}" except (json.JSONDecodeError, ValueError): if e.response.text: error_message += f" - {e.response.text}" raise ValueError(error_message) except httpx.RequestError as e: # Handle request errors (connection, timeout, etc.) raise ValueError(f"Request error: {str(e)}") class OpenAPIResource(Resource): """Resource implementation for OpenAPI endpoints.""" def __init__( self, client: httpx.AsyncClient, route: openapi.HTTPRoute, uri: str, name: str, description: str, mime_type: str = "application/json", tags: set[str] = set(), timeout: float | None = None, ): super().__init__( uri=AnyUrl(uri), # Convert string to AnyUrl name=name, description=description, mime_type=mime_type, tags=tags, ) self._client = client self._route = route self._timeout = timeout def __repr__(self) -> str: """Custom representation to prevent recursion errors when printing.""" return f"OpenAPIResource(name={self.name!r}, uri={self.uri!r}, path={self._route.path})" async def read(self) -> str | bytes: """Fetch the resource data by making an HTTP request.""" try: # Extract path parameters from the URI if present path = self._route.path resource_uri = str(self.uri) # If this is a templated resource, extract path parameters from the URI if "{" in path and "}" in path: # Extract the resource ID from the URI (the last part after the last slash) parts = resource_uri.split("/") if len(parts) > 1: # Find all path parameters in the route path path_params = {} # Find the path parameter names from the route path param_matches = re.findall(r"\{([^}]+)\}", path) if param_matches: # Reverse sorting from creation order (traversal is backwards) param_matches.sort(reverse=True) # Number of sent parameters is number of parts -1 (assuming first part is resource identifier) expected_param_count = len(parts) - 1 # Map parameters from the end of the URI to the parameters in the path # Last parameter in URI (parts[-1]) maps to last parameter in path, and so on for i, param_name in enumerate(param_matches): # Ensure we don't use resource identifier as parameter if i < expected_param_count: # Get values from the end of parts param_value = parts[-1 - i] path_params[param_name] = param_value # Replace path parameters with their values for param_name, param_value in path_params.items(): path = path.replace(f"{{{param_name}}}", str(param_value)) # Filter any query parameters - get query parameters and filter out None/empty values query_params = {} for param in self._route.parameters: if param.location == "query" and hasattr(self, f"_{param.name}"): value = getattr(self, f"_{param.name}") if value is not None and value != "": query_params[param.name] = value # Prepare headers from MCP client request if available headers = {} mcp_headers = get_http_headers() headers.update(mcp_headers) response = await self._client.request( method=self._route.method, url=path, params=query_params, headers=headers, timeout=self._timeout, ) # Raise for 4xx/5xx responses response.raise_for_status() # Determine content type and return appropriate format content_type = response.headers.get("content-type", "").lower() if "application/json" in content_type: result = response.json() return json.dumps(result) elif any(ct in content_type for ct in ["text/", "application/xml"]): return response.text else: return response.content except httpx.HTTPStatusError as e: # Handle HTTP errors (4xx, 5xx) error_message = ( f"HTTP error {e.response.status_code}: {e.response.reason_phrase}" ) try: error_data = e.response.json() error_message += f" - {error_data}" except (json.JSONDecodeError, ValueError): if e.response.text: error_message += f" - {e.response.text}" raise ValueError(error_message) except httpx.RequestError as e: # Handle request errors (connection, timeout, etc.) raise ValueError(f"Request error: {str(e)}") class OpenAPIResourceTemplate(ResourceTemplate): """Resource template implementation for OpenAPI endpoints.""" def __init__( self, client: httpx.AsyncClient, route: openapi.HTTPRoute, uri_template: str, name: str, description: str, parameters: dict[str, Any], tags: set[str] = set(), timeout: float | None = None, ): super().__init__( uri_template=uri_template, name=name, description=description, parameters=parameters, tags=tags, ) self._client = client self._route = route self._timeout = timeout def __repr__(self) -> str: """Custom representation to prevent recursion errors when printing.""" return f"OpenAPIResourceTemplate(name={self.name!r}, uri_template={self.uri_template!r}, path={self._route.path})" async def create_resource( self, uri: str, params: dict[str, Any], context: Context | None = None, ) -> Resource: """Create a resource with the given parameters.""" # Generate a URI for this resource instance uri_parts = [] for key, value in params.items(): uri_parts.append(f"{key}={value}") # Create and return a resource return OpenAPIResource( client=self._client, route=self._route, uri=uri, name=f"{self.name}-{'-'.join(uri_parts)}", description=self.description or f"Resource for {self._route.path}", mime_type="application/json", tags=set(self._route.tags or []), timeout=self._timeout, ) class FastMCPOpenAPI(FastMCP): """ FastMCP server implementation that creates components from an OpenAPI schema. This class parses an OpenAPI specification and creates appropriate FastMCP components (Tools, Resources, ResourceTemplates) based on route mappings. Example: ```python from fastmcp.server.openapi import FastMCPOpenAPI, RouteMap, MCPType import httpx # Define custom route mappings custom_mappings = [ # Map all user-related endpoints to ResourceTemplate RouteMap( methods=["GET", "POST", "PATCH"], pattern=r".*/users/.*", mcp_type=MCPType.RESOURCE_TEMPLATE ), # Map all analytics endpoints to Tool RouteMap( methods=["GET"], pattern=r".*/analytics/.*", mcp_type=MCPType.TOOL ), ] # Create server with custom mappings and route mapper server = FastMCPOpenAPI( openapi_spec=spec, client=httpx.AsyncClient(), name="API Server", route_maps=custom_mappings, ) ``` """ def __init__( self, openapi_spec: dict[str, Any], client: httpx.AsyncClient, name: str | None = None, route_maps: list[RouteMap] | None = None, route_map_fn: RouteMapFn | None = None, mcp_component_fn: ComponentFn | None = None, mcp_names: dict[str, str] | None = None, tags: set[str] | None = None, timeout: float | None = None, **settings: Any, ): """ Initialize a FastMCP server from an OpenAPI schema. Args: openapi_spec: OpenAPI schema as a dictionary or file path client: httpx AsyncClient for making HTTP requests name: Optional name for the server route_maps: Optional list of RouteMap objects defining route mappings route_map_fn: Optional callable for advanced route type mapping. Receives (route, mcp_type) and returns MCPType or None. Called on every route, including excluded ones. mcp_component_fn: Optional callable for component customization. Receives (route, component) and can modify the component in-place. Called on every created component. mcp_names: Optional dictionary mapping operationId to desired component names. If an operationId is not in the dictionary, falls back to using the operationId up to the first double underscore. If no operationId exists, falls back to slugified summary or path-based naming. All names are truncated to 56 characters maximum. tags: Optional set of tags to add to all components. Components always receive any tags from the route. timeout: Optional timeout (in seconds) for all requests **settings: Additional settings for FastMCP """ super().__init__(name=name or "OpenAPI FastMCP", **settings) self._client = client self._timeout = timeout self._mcp_component_fn = mcp_component_fn # Keep track of names to detect collisions self._used_names = { "tool": Counter(), "resource": Counter(), "resource_template": Counter(), "prompt": Counter(), } http_routes = openapi.parse_openapi_to_http_routes(openapi_spec) # Process routes route_maps = (route_maps or []) + DEFAULT_ROUTE_MAPPINGS for route in http_routes: # Determine route type based on mappings or default rules route_map = _determine_route_type(route, route_maps) # TODO: remove this once RouteType is removed and mcp_type is typed as MCPType without | None assert route_map.mcp_type is not None route_type = route_map.mcp_type # Call route_map_fn if provided if route_map_fn is not None: try: result = route_map_fn(route, route_type) if result is not None: route_type = result logger.debug( f"Route {route.method} {route.path} mapping customized by route_map_fn: " f"type={route_type.name}" ) except Exception as e: logger.warning( f"Error in route_map_fn for {route.method} {route.path}: {e}. " f"Using default values." ) # Generate a default name from the route component_name = self._generate_default_name(route, mcp_names) route_tags = set(route.tags) | route_map.mcp_tags | (tags or set()) if route_type == MCPType.TOOL: self._create_openapi_tool(route, component_name, tags=route_tags) elif route_type == MCPType.RESOURCE: self._create_openapi_resource(route, component_name, tags=route_tags) elif route_type == MCPType.RESOURCE_TEMPLATE: self._create_openapi_template(route, component_name, tags=route_tags) elif route_type == MCPType.EXCLUDE: logger.info(f"Excluding route: {route.method} {route.path}") logger.info(f"Created FastMCP OpenAPI server with {len(http_routes)} routes") def _generate_default_name( self, route: openapi.HTTPRoute, mcp_names_map: dict[str, str] | None = None ) -> str: """Generate a default name from the route using the configured strategy.""" name = "" mcp_names_map = mcp_names_map or {} # First check if there's a custom mapping for this operationId if route.operation_id: if route.operation_id in mcp_names_map: name = mcp_names_map[route.operation_id] else: # If there's a double underscore in the operationId, use the first part name = route.operation_id.split("__")[0] else: name = route.summary or f"{route.method}_{route.path}" name = _slugify(name) # Truncate to 56 characters maximum if len(name) > 56: name = name[:56] return name def _get_unique_name( self, name: str, component_type: Literal["tool", "resource", "resource_template", "prompt"], ) -> str: """ Ensure the name is unique within its component type by appending numbers if needed. Args: name: The proposed name component_type: The type of component ("tools", "resources", or "templates") Returns: str: A unique name for the component """ # Check if the name is already used self._used_names[component_type][name] += 1 if self._used_names[component_type][name] == 1: return name else: # Create the new name new_name = f"{name}_{self._used_names[component_type][name]}" logger.debug( f"Name collision detected: '{name}' already exists as a {component_type[:-1]}. " f"Using '{new_name}' instead." ) return new_name def _create_openapi_tool( self, route: openapi.HTTPRoute, name: str, tags: set[str], ): """Creates and registers an OpenAPITool with enhanced description.""" combined_schema = _combine_schemas(route) # Get a unique tool name tool_name = self._get_unique_name(name, "tool") base_description = ( route.description or route.summary or f"Executes {route.method} {route.path}" ) # Format enhanced description with parameters and request body enhanced_description = format_description_with_responses( base_description=base_description, responses=route.responses, parameters=route.parameters, request_body=route.request_body, ) tool = OpenAPITool( client=self._client, route=route, name=tool_name, description=enhanced_description, parameters=combined_schema, tags=set(route.tags or []) | tags, timeout=self._timeout, ) # Call component_fn if provided if self._mcp_component_fn is not None: try: self._mcp_component_fn(route, tool) logger.debug(f"Tool {tool_name} customized by component_fn") except Exception as e: logger.warning( f"Error in component_fn for tool {tool_name}: {e}. " f"Using component as-is." ) # Register the tool by directly assigning to the tools dictionary self._tool_manager._tools[tool_name] = tool logger.debug( f"Registered TOOL: {tool_name} ({route.method} {route.path}) with tags: {route.tags}" ) def _create_openapi_resource( self, route: openapi.HTTPRoute, name: str, tags: set[str], ): """Creates and registers an OpenAPIResource with enhanced description.""" # Get a unique resource name resource_name = self._get_unique_name(name, "resource") resource_uri = f"resource://{resource_name}" base_description = ( route.description or route.summary or f"Represents {route.path}" ) # Format enhanced description with parameters and request body enhanced_description = format_description_with_responses( base_description=base_description, responses=route.responses, parameters=route.parameters, request_body=route.request_body, ) resource = OpenAPIResource( client=self._client, route=route, uri=resource_uri, name=resource_name, description=enhanced_description, tags=set(route.tags or []) | tags, timeout=self._timeout, ) # Call component_fn if provided if self._mcp_component_fn is not None: try: self._mcp_component_fn(route, resource) logger.debug(f"Resource {resource_uri} customized by component_fn") except Exception as e: logger.warning( f"Error in component_fn for resource {resource_uri}: {e}. " f"Using component as-is." ) # Register the resource by directly assigning to the resources dictionary self._resource_manager._resources[str(resource.uri)] = resource logger.debug( f"Registered RESOURCE: {resource_uri} ({route.method} {route.path}) with tags: {route.tags}" ) def _create_openapi_template( self, route: openapi.HTTPRoute, name: str, tags: set[str], ): """Creates and registers an OpenAPIResourceTemplate with enhanced description.""" # Get a unique template name template_name = self._get_unique_name(name, "resource_template") path_params = [p.name for p in route.parameters if p.location == "path"] path_params.sort() # Sort for consistent URIs uri_template_str = f"resource://{template_name}" if path_params: uri_template_str += "/" + "/".join(f"{{{p}}}" for p in path_params) base_description = ( route.description or route.summary or f"Template for {route.path}" ) # Format enhanced description with parameters and request body enhanced_description = format_description_with_responses( base_description=base_description, responses=route.responses, parameters=route.parameters, request_body=route.request_body, ) template_params_schema = { "type": "object", "properties": { p.name: { **(p.schema_.copy() if isinstance(p.schema_, dict) else {}), **( {"description": p.description} if p.description and not ( isinstance(p.schema_, dict) and "description" in p.schema_ ) else {} ), } for p in route.parameters if p.location == "path" }, "required": [ p.name for p in route.parameters if p.location == "path" and p.required ], } template = OpenAPIResourceTemplate( client=self._client, route=route, uri_template=uri_template_str, name=template_name, description=enhanced_description, parameters=template_params_schema, tags=set(route.tags or []) | tags, timeout=self._timeout, ) # Call component_fn if provided if self._mcp_component_fn is not None: try: self._mcp_component_fn(route, template) logger.debug(f"Template {uri_template_str} customized by component_fn") except Exception as e: logger.warning( f"Error in component_fn for template {uri_template_str}: {e}. " f"Using component as-is." ) # Register the template by directly assigning to the templates dictionary self._resource_manager._templates[uri_template_str] = template logger.debug( f"Registered TEMPLATE: {uri_template_str} ({route.method} {route.path}) with tags: {route.tags}" )