fastmcp
Version:
A TypeScript framework for building MCP servers.
1 lines • 120 kB
Source Map (JSON)
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void;\n};\n\ntype FastMCPSessionEvents = {\n error: (event: { error: Error }) => void;\n ready: () => void;\n rootsChanged: (event: { roots: Root[] }) => void;\n};\n\nexport const imageContent = async (\n input: { buffer: Buffer } | { path: string } | { url: string },\n): Promise<ImageContent> => {\n let rawData: Buffer;\n\n try {\n if (\"url\" in input) {\n try {\n const response = await fetch(input.url);\n\n if (!response.ok) {\n throw new Error(\n `Server responded with status: ${response.status} - ${response.statusText}`,\n );\n }\n\n rawData = Buffer.from(await response.arrayBuffer());\n } catch (error) {\n throw new Error(\n `Failed to fetch image from URL (${input.url}): ${\n error instanceof Error ? error.message : String(error)\n }`,\n );\n }\n } else if (\"path\" in input) {\n try {\n rawData = await readFile(input.path);\n } catch (error) {\n throw new Error(\n `Failed to read image from path (${input.path}): ${\n error instanceof Error ? error.message : String(error)\n }`,\n );\n }\n } else if (\"buffer\" in input) {\n rawData = input.buffer;\n } else {\n throw new Error(\n \"Invalid input: Provide a valid 'url', 'path', or 'buffer'\",\n );\n }\n\n const { fileTypeFromBuffer } = await import(\"file-type\");\n const mimeType = await fileTypeFromBuffer(rawData);\n\n if (!mimeType || !mimeType.mime.startsWith(\"image/\")) {\n console.warn(\n `Warning: Content may not be a valid image. Detected MIME: ${\n mimeType?.mime || \"unknown\"\n }`,\n );\n }\n\n const base64Data = rawData.toString(\"base64\");\n\n return {\n data: base64Data,\n mimeType: mimeType?.mime ?? \"image/png\",\n type: \"image\",\n } as const;\n } catch (error) {\n if (error instanceof Error) {\n throw error;\n } else {\n throw new Error(`Unexpected error processing image: ${String(error)}`);\n }\n }\n};\n\nexport const audioContent = async (\n input: { buffer: Buffer } | { path: string } | { url: string },\n): Promise<AudioContent> => {\n let rawData: Buffer;\n\n try {\n if (\"url\" in input) {\n try {\n const response = await fetch(input.url);\n\n if (!response.ok) {\n throw new Error(\n `Server responded with status: ${response.status} - ${response.statusText}`,\n );\n }\n\n rawData = Buffer.from(await response.arrayBuffer());\n } catch (error) {\n throw new Error(\n `Failed to fetch audio from URL (${input.url}): ${\n error instanceof Error ? error.message : String(error)\n }`,\n );\n }\n } else if (\"path\" in input) {\n try {\n rawData = await readFile(input.path);\n } catch (error) {\n throw new Error(\n `Failed to read audio from path (${input.path}): ${\n error instanceof Error ? error.message : String(error)\n }`,\n );\n }\n } else if (\"buffer\" in input) {\n rawData = input.buffer;\n } else {\n throw new Error(\n \"Invalid input: Provide a valid 'url', 'path', or 'buffer'\",\n );\n }\n\n const { fileTypeFromBuffer } = await import(\"file-type\");\n const mimeType = await fileTypeFromBuffer(rawData);\n\n if (!mimeType || !mimeType.mime.startsWith(\"audio/\")) {\n console.warn(\n `Warning: Content may not be a valid audio file. Detected MIME: ${\n mimeType?.mime || \"unknown\"\n }`,\n );\n }\n\n const base64Data = rawData.toString(\"base64\");\n\n return {\n data: base64Data,\n mimeType: mimeType?.mime ?? \"audio/mpeg\",\n type: \"audio\",\n } as const;\n } catch (error) {\n if (error instanceof Error) {\n throw error;\n } else {\n throw new Error(`Unexpected error processing audio: ${String(error)}`);\n }\n }\n};\n\ntype Context<T extends FastMCPSessionAuth> = {\n client: {\n version: ReturnType<Server[\"getClientVersion\"]>;\n };\n log: {\n debug: (message: string, data?: SerializableValue) => void;\n error: (message: string, data?: SerializableValue) => void;\n info: (message: string, data?: SerializableValue) => void;\n warn: (message: string, data?: SerializableValue) => void;\n };\n reportProgress: (progress: Progress) => Promise<void>;\n /**\n * Request ID from the current MCP request.\n * Available for all transports when the client provides it.\n */\n requestId?: string;\n session: T | undefined;\n /**\n * Session ID from the Mcp-Session-Id header.\n * Only available for HTTP-based transports (SSE, HTTP Stream).\n * Can be used to track per-session state, implement session-specific\n * counters, or maintain user-specific data across multiple requests.\n */\n sessionId?: string;\n streamContent: (content: Content | Content[]) => Promise<void>;\n};\n\ntype Extra = unknown;\n\ntype Extras = Record<string, Extra>;\n\ntype Literal = boolean | null | number | string | undefined;\n\ntype Progress = {\n /**\n * The progress thus far. This should increase every time progress is made, even if the total is unknown.\n */\n progress: number;\n /**\n * Total number of items to process (or total progress required), if known.\n */\n total?: number;\n};\n\ntype SerializableValue =\n | { [key: string]: SerializableValue }\n | Literal\n | SerializableValue[];\n\ntype TextContent = {\n text: string;\n type: \"text\";\n};\n\ntype ToolParameters = StandardSchemaV1;\n\nabstract class FastMCPError extends Error {\n public constructor(message?: string) {\n super(message);\n this.name = new.target.name;\n }\n}\n\nexport class UnexpectedStateError extends FastMCPError {\n public extras?: Extras;\n\n public constructor(message: string, extras?: Extras) {\n super(message);\n this.name = new.target.name;\n this.extras = extras;\n }\n}\n\n/**\n * An error that is meant to be surfaced to the user.\n */\nexport class UserError extends UnexpectedStateError {}\n\nconst TextContentZodSchema = z\n .object({\n /**\n * The text content of the message.\n */\n text: z.string(),\n type: z.literal(\"text\"),\n })\n .strict() satisfies z.ZodType<TextContent>;\n\ntype ImageContent = {\n data: string;\n mimeType: string;\n type: \"image\";\n};\n\nconst ImageContentZodSchema = z\n .object({\n /**\n * The base64-encoded image data.\n */\n data: z.string().base64(),\n /**\n * The MIME type of the image. Different providers may support different image types.\n */\n mimeType: z.string(),\n type: z.literal(\"image\"),\n })\n .strict() satisfies z.ZodType<ImageContent>;\n\ntype AudioContent = {\n data: string;\n mimeType: string;\n type: \"audio\";\n};\n\nconst AudioContentZodSchema = z\n .object({\n /**\n * The base64-encoded audio data.\n */\n data: z.string().base64(),\n mimeType: z.string(),\n type: z.literal(\"audio\"),\n })\n .strict() satisfies z.ZodType<AudioContent>;\n\ntype ResourceContent = {\n resource: {\n blob?: string;\n mimeType?: string;\n text?: string;\n uri: string;\n };\n type: \"resource\";\n};\n\nconst ResourceContentZodSchema = z\n .object({\n resource: z.object({\n blob: z.string().optional(),\n mimeType: z.string().optional(),\n text: z.string().optional(),\n uri: z.string(),\n }),\n type: z.literal(\"resource\"),\n })\n .strict() satisfies z.ZodType<ResourceContent>;\n\nconst ResourceLinkZodSchema = z.object({\n description: z.string().optional(),\n mimeType: z.string().optional(),\n name: z.string(),\n title: z.string().optional(),\n type: z.literal(\"resource_link\"),\n uri: z.string(),\n}) satisfies z.ZodType<ResourceLink>;\n\ntype Content =\n | AudioContent\n | ImageContent\n | ResourceContent\n | ResourceLink\n | TextContent;\n\nconst ContentZodSchema = z.discriminatedUnion(\"type\", [\n TextContentZodSchema,\n ImageContentZodSchema,\n AudioContentZodSchema,\n ResourceContentZodSchema,\n ResourceLinkZodSchema,\n]) satisfies z.ZodType<Content>;\n\ntype ContentResult = {\n content: Content[];\n isError?: boolean;\n};\n\nconst ContentResultZodSchema = z\n .object({\n content: ContentZodSchema.array(),\n isError: z.boolean().optional(),\n })\n .strict() satisfies z.ZodType<ContentResult>;\n\ntype Completion = {\n hasMore?: boolean;\n total?: number;\n values: string[];\n};\n\n/**\n * https://github.com/modelcontextprotocol/typescript-sdk/blob/3164da64d085ec4e022ae881329eee7b72f208d4/src/types.ts#L983-L1003\n */\nconst CompletionZodSchema = z.object({\n /**\n * Indicates whether there are additional completion options beyond those provided in the current response, even if the exact total is unknown.\n */\n hasMore: z.optional(z.boolean()),\n /**\n * The total number of completion options available. This can exceed the number of values actually sent in the response.\n */\n total: z.optional(z.number().int()),\n /**\n * An array of completion values. Must not exceed 100 items.\n */\n values: z.array(z.string()).max(100),\n}) satisfies z.ZodType<Completion>;\n\ntype ArgumentValueCompleter<T extends FastMCPSessionAuth = FastMCPSessionAuth> =\n (value: string, auth?: T) => Promise<Completion>;\n\ntype InputPrompt<\n T extends FastMCPSessionAuth = FastMCPSessionAuth,\n Arguments extends InputPromptArgument<T>[] = InputPromptArgument<T>[],\n Args = PromptArgumentsToObject<Arguments>,\n> = {\n arguments?: InputPromptArgument<T>[];\n complete?: (name: string, value: string, auth?: T) => Promise<Completion>;\n description?: string;\n load: (args: Args, auth?: T) => Promise<PromptResult>;\n name: string;\n};\n\ntype InputPromptArgument<T extends FastMCPSessionAuth = FastMCPSessionAuth> =\n Readonly<{\n complete?: ArgumentValueCompleter<T>;\n description?: string;\n enum?: string[];\n name: string;\n required?: boolean;\n }>;\n\ntype InputResourceTemplate<\n T extends FastMCPSessionAuth,\n Arguments extends InputResourceTemplateArgument<T>[] =\n InputResourceTemplateArgument<T>[],\n> = {\n arguments: Arguments;\n complete?: (name: string, value: string, auth?: T) => Promise<Completion>;\n description?: string;\n load: (\n args: ResourceTemplateArgumentsToObject<Arguments>,\n auth?: T,\n ) => Promise<ResourceResult | ResourceResult[]>;\n mimeType?: string;\n name: string;\n uriTemplate: string;\n};\n\ntype InputResourceTemplateArgument<\n T extends FastMCPSessionAuth = FastMCPSessionAuth,\n> = Readonly<{\n complete?: ArgumentValueCompleter<T>;\n description?: string;\n name: string;\n required?: boolean;\n}>;\n\ntype LoggingLevel =\n | \"alert\"\n | \"critical\"\n | \"debug\"\n | \"emergency\"\n | \"error\"\n | \"info\"\n | \"notice\"\n | \"warning\";\n\ntype Prompt<\n T extends FastMCPSessionAuth = FastMCPSessionAuth,\n Arguments extends PromptArgument<T>[] = PromptArgument<T>[],\n Args = PromptArgumentsToObject<Arguments>,\n> = {\n arguments?: PromptArgument<T>[];\n complete?: (name: string, value: string, auth?: T) => Promise<Completion>;\n description?: string;\n load: (args: Args, auth?: T) => Promise<PromptResult>;\n name: string;\n};\n\ntype PromptArgument<T extends FastMCPSessionAuth = FastMCPSessionAuth> =\n Readonly<{\n complete?: ArgumentValueCompleter<T>;\n description?: string;\n enum?: string[];\n name: string;\n required?: boolean;\n }>;\n\ntype PromptArgumentsToObject<T extends { name: string; required?: boolean }[]> =\n {\n [K in T[number][\"name\"]]: Extract<\n T[number],\n { name: K }\n >[\"required\"] extends true\n ? string\n : string | undefined;\n };\n\ntype PromptResult = Pick<GetPromptResult, \"messages\"> | string;\n\ntype Resource<T extends FastMCPSessionAuth> = {\n complete?: (name: string, value: string, auth?: T) => Promise<Completion>;\n description?: string;\n load: (auth?: T) => Promise<ResourceResult | ResourceResult[]>;\n mimeType?: string;\n name: string;\n uri: string;\n};\n\ntype ResourceResult =\n | {\n blob: string;\n mimeType?: string;\n uri?: string;\n }\n | {\n mimeType?: string;\n text: string;\n uri?: string;\n };\n\ntype ResourceTemplate<\n T extends FastMCPSessionAuth,\n Arguments extends ResourceTemplateArgument<T>[] =\n ResourceTemplateArgument<T>[],\n> = {\n arguments: Arguments;\n complete?: (name: string, value: string, auth?: T) => Promise<Completion>;\n description?: string;\n load: (\n args: ResourceTemplateArgumentsToObject<Arguments>,\n auth?: T,\n ) => Promise<ResourceResult | ResourceResult[]>;\n mimeType?: string;\n name: string;\n uriTemplate: string;\n};\n\ntype ResourceTemplateArgument<\n T extends FastMCPSessionAuth = FastMCPSessionAuth,\n> = Readonly<{\n complete?: ArgumentValueCompleter<T>;\n description?: string;\n name: string;\n required?: boolean;\n}>;\n\ntype ResourceTemplateArgumentsToObject<T extends { name: string }[]> = {\n [K in T[number][\"name\"]]: string;\n};\n\ntype SamplingResponse = {\n content: AudioContent | ImageContent | TextContent;\n model: string;\n role: \"assistant\" | \"user\";\n stopReason?: \"endTurn\" | \"maxTokens\" | \"stopSequence\" | string;\n};\n\ntype ServerOptions<T extends FastMCPSessionAuth> = {\n authenticate?: Authenticate<T>;\n /**\n * Configuration for the health-check endpoint that can be exposed when the\n * server is running using the HTTP Stream transport. When enabled, the\n * server will respond to an HTTP GET request with the configured path (by\n * default \"/health\") rendering a plain-text response (by default \"ok\") and\n * the configured status code (by default 200).\n *\n * The endpoint is only added when the server is started with\n * `transportType: \"httpStream\"` – it is ignored for the stdio transport.\n */\n health?: {\n /**\n * When set to `false` the health-check endpoint is disabled.\n * @default true\n */\n enabled?: boolean;\n\n /**\n * Plain-text body returned by the endpoint.\n * @default \"ok\"\n */\n message?: string;\n\n /**\n * HTTP path that should be handled.\n * @default \"/health\"\n */\n path?: string;\n\n /**\n * HTTP response status that will be returned.\n * @default 200\n */\n status?: number;\n };\n instructions?: string;\n /**\n * Custom logger instance. If not provided, defaults to console.\n * Use this to integrate with your own logging system.\n */\n logger?: Logger;\n name: string;\n\n /**\n * Configuration for OAuth well-known discovery endpoints that can be exposed\n * when the server is running using HTTP-based transports (SSE or HTTP Stream).\n * When enabled, the server will respond to requests for OAuth discovery endpoints\n * with the configured metadata.\n *\n * The endpoints are only added when the server is started with\n * `transportType: \"httpStream\"` – they are ignored for the stdio transport.\n * Both SSE and HTTP Stream transports support OAuth endpoints.\n */\n oauth?: {\n /**\n * OAuth Authorization Server metadata for /.well-known/oauth-authorization-server\n *\n * This endpoint follows RFC 8414 (OAuth 2.0 Authorization Server Metadata)\n * and provides metadata about the OAuth 2.0 authorization server.\n *\n * Required by MCP Specification 2025-03-26\n */\n authorizationServer?: {\n authorizationEndpoint: string;\n codeChallengeMethodsSupported?: string[];\n // DPoP support\n dpopSigningAlgValuesSupported?: string[];\n grantTypesSupported?: string[];\n\n introspectionEndpoint?: string;\n // Required\n issuer: string;\n // Common optional\n jwksUri?: string;\n opPolicyUri?: string;\n opTosUri?: string;\n registrationEndpoint?: string;\n responseModesSupported?: string[];\n responseTypesSupported: string[];\n revocationEndpoint?: string;\n scopesSupported?: string[];\n serviceDocumentation?: string;\n tokenEndpoint: string;\n tokenEndpointAuthMethodsSupported?: string[];\n tokenEndpointAuthSigningAlgValuesSupported?: string[];\n\n uiLocalesSupported?: string[];\n };\n\n /**\n * Whether OAuth discovery endpoints should be enabled.\n */\n enabled: boolean;\n\n /**\n * OAuth Protected Resource metadata for `/.well-known/oauth-protected-resource`\n *\n * This endpoint follows {@link https://www.rfc-editor.org/rfc/rfc9728.html | RFC 9728}\n * and provides metadata describing how an OAuth 2.0 protected resource (in this case,\n * an MCP server) expects to be accessed.\n *\n * When configured, FastMCP will automatically serve this metadata at the\n * `/.well-known/oauth-protected-resource` endpoint. The `authorizationServers` and `resource`\n * fields are required. All others are optional and will be omitted from the published\n * metadata if not specified.\n *\n * This satisfies the requirements of the MCP Authorization specification's\n * {@link https://modelcontextprotocol.io/specification/2025-06-18/basic/authorization#authorization-server-location | Authorization Server Location section}.\n *\n * Clients consuming this metadata MUST validate that any presented values comply with\n * RFC 9728, including strict validation of the `resource` identifier and intended audience\n * when access tokens are issued and presented (per RFC 8707 §2).\n *\n * @remarks Required by MCP Specification version 2025-06-18\n */\n protectedResource?: {\n /**\n * Allows for additional metadata fields beyond those defined in RFC 9728.\n *\n * @remarks This supports vendor-specific or experimental extensions.\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2.3 | RFC 9728 §2.3}\n */\n [key: string]: unknown;\n\n /**\n * Supported values for the `authorization_details` parameter (RFC 9396).\n *\n * @remarks Used when fine-grained access control is in play.\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.23 | RFC 9728 §2.2.23}\n */\n authorizationDetailsTypesSupported?: string[];\n\n /**\n * List of OAuth 2.0 authorization server issuer identifiers.\n *\n * These correspond to ASes that can issue access tokens for this protected resource.\n * MCP clients use these values to locate the relevant `/.well-known/oauth-authorization-server`\n * metadata for initiating the OAuth flow.\n *\n * @remarks Required by the MCP spec. MCP servers MUST provide at least one issuer.\n * Clients are responsible for choosing among them (see RFC 9728 §7.6).\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.3 | RFC 9728 §2.2.3}\n */\n authorizationServers: string[];\n\n /**\n * List of supported methods for presenting OAuth 2.0 bearer tokens.\n *\n * @remarks Valid values are `header`, `body`, and `query`.\n * If omitted, clients MAY assume only `header` is supported, per RFC 6750.\n * This is a client-side interpretation and not a serialization default.\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.9 | RFC 9728 §2.2.9}\n */\n bearerMethodsSupported?: string[];\n\n /**\n * Whether this resource requires all access tokens to be DPoP-bound.\n *\n * @remarks If omitted, clients SHOULD assume this is `false`.\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.27 | RFC 9728 §2.2.27}\n */\n dpopBoundAccessTokensRequired?: boolean;\n\n /**\n * Supported algorithms for verifying DPoP proofs (RFC 9449).\n *\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.25 | RFC 9728 §2.2.25}\n */\n dpopSigningAlgValuesSupported?: string[];\n\n /**\n * JWKS URI of this resource. Used to validate access tokens or sign responses.\n *\n * @remarks When present, this MUST be an `https:` URI pointing to a valid JWK Set (RFC 7517).\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.5 | RFC 9728 §2.2.5}\n */\n jwksUri?: string;\n\n /**\n * Canonical OAuth resource identifier for this protected resource (the MCP server).\n *\n * @remarks Typically the base URL of the MCP server. Clients MUST use this as the\n * `resource` parameter in authorization and token requests (per RFC 8707).\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.1 | RFC 9728 §2.2.1}\n */\n resource: string;\n\n /**\n * URL to developer-accessible documentation for this resource.\n *\n * @remarks This field MAY be localized.\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.15 | RFC 9728 §2.2.15}\n */\n resourceDocumentation?: string;\n\n /**\n * Human-readable name for display purposes (e.g., in UIs).\n *\n * @remarks This field MAY be localized using language tags (`resource_name#en`, etc.).\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.13 | RFC 9728 §2.2.13}\n */\n resourceName?: string;\n\n /**\n * URL to a human-readable policy page describing acceptable use.\n *\n * @remarks This field MAY be localized.\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.17 | RFC 9728 §2.2.17}\n */\n resourcePolicyUri?: string;\n\n /**\n * Supported JWS algorithms for signed responses from this resource (e.g., response signing).\n *\n * @remarks MUST NOT include `none`.\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.11 | RFC 9728 §2.2.11}\n */\n resourceSigningAlgValuesSupported?: string[];\n\n /**\n * URL to the protected resource’s Terms of Service.\n *\n * @remarks This field MAY be localized.\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.19 | RFC 9728 §2.2.19}\n */\n resourceTosUri?: string;\n\n /**\n * Supported OAuth scopes for requesting access to this resource.\n *\n * @remarks Useful for discovery, but clients SHOULD still request the minimal scope required.\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.7 | RFC 9728 §2.2.7}\n */\n scopesSupported?: string[];\n\n /**\n * Developer-accessible documentation for how to use the service (not end-user docs).\n *\n * @remarks Semantically equivalent to `resourceDocumentation`, but included under its\n * alternate name for compatibility with tools or schemas expecting either.\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.15 | RFC 9728 §2.2.15}\n */\n serviceDocumentation?: string;\n\n /**\n * Whether mutual-TLS-bound access tokens are required.\n *\n * @remarks If omitted, clients SHOULD assume this is `false` (client-side behavior).\n * @see {@link https://www.rfc-editor.org/rfc/rfc9728.html#section-2-2.21 | RFC 9728 §2.2.21}\n */\n tlsClientCertificateBoundAccessTokens?: boolean;\n };\n\n /**\n * OAuth Proxy instance for automatic OAuth flow handling.\n * When provided, FastMCP will automatically register OAuth endpoints:\n * - /oauth/register (DCR)\n * - /oauth/authorize\n * - /oauth/token\n * - /oauth/callback\n * - /oauth/consent\n */\n proxy?: OAuthProxy;\n };\n\n ping?: {\n /**\n * Whether ping should be enabled by default.\n * - true for SSE or HTTP Stream\n * - false for stdio\n */\n enabled?: boolean;\n /**\n * Interval\n * @default 5000 (5s)\n */\n intervalMs?: number;\n /**\n * Logging level for ping-related messages.\n * @default 'debug'\n */\n logLevel?: LoggingLevel;\n };\n /**\n * Configuration for roots capability\n */\n roots?: {\n /**\n * Whether roots capability should be enabled\n * Set to false to completely disable roots support\n * @default true\n */\n enabled?: boolean;\n };\n /**\n * General utilities\n */\n utils?: {\n formatInvalidParamsErrorMessage?: (\n issues: readonly StandardSchemaV1.Issue[],\n ) => string;\n };\n version: `${number}.${number}.${number}`;\n};\n\ntype Tool<\n T extends FastMCPSessionAuth,\n Params extends ToolParameters = ToolParameters,\n> = {\n annotations?: {\n /**\n * When true, the tool leverages incremental content streaming\n * Return void for tools that handle all their output via streaming\n */\n streamingHint?: boolean;\n } & ToolAnnotations;\n canAccess?: (auth: T) => boolean;\n description?: string;\n\n execute: (\n args: StandardSchemaV1.InferOutput<Params>,\n context: Context<T>,\n ) => Promise<\n | AudioContent\n | ContentResult\n | ImageContent\n | ResourceContent\n | ResourceLink\n | string\n | TextContent\n | void\n >;\n name: string;\n parameters?: Params;\n timeoutMs?: number;\n};\n\n/**\n * Tool annotations as defined in MCP Specification (2025-03-26)\n * These provide hints about a tool's behavior.\n */\ntype ToolAnnotations = {\n /**\n * If true, the tool may perform destructive updates\n * Only meaningful when readOnlyHint is false\n * @default true\n */\n destructiveHint?: boolean;\n\n /**\n * If true, calling the tool repeatedly with the same arguments has no additional effect\n * Only meaningful when readOnlyHint is false\n * @default false\n */\n idempotentHint?: boolean;\n\n /**\n * If true, the tool may interact with an \"open world\" of external entities\n * @default true\n */\n openWorldHint?: boolean;\n\n /**\n * If true, indicates the tool does not modify its environment\n * @default false\n */\n readOnlyHint?: boolean;\n\n /**\n * A human-readable title for the tool, useful for UI display\n */\n title?: string;\n};\n\nconst FastMCPSessionEventEmitterBase: {\n new (): StrictEventEmitter<EventEmitter, FastMCPSessionEvents>;\n} = EventEmitter;\n\nexport enum ServerState {\n Error = \"error\",\n Running = \"running\",\n Stopped = \"stopped\",\n}\n\ntype Authenticate<T> = (request: http.IncomingMessage) => Promise<T>;\n\ntype FastMCPSessionAuth = Record<string, unknown> | undefined;\n\nclass FastMCPSessionEventEmitter extends FastMCPSessionEventEmitterBase {}\nexport class FastMCPSession<\n T extends FastMCPSessionAuth = FastMCPSessionAuth,\n> extends FastMCPSessionEventEmitter {\n public get clientCapabilities(): ClientCapabilities | null {\n return this.#clientCapabilities ?? null;\n }\n public get isReady(): boolean {\n return this.#connectionState === \"ready\";\n }\n public get loggingLevel(): LoggingLevel {\n return this.#loggingLevel;\n }\n public get roots(): Root[] {\n r