Modules
The high-level API.
Declarative auth wrapper and authenticator contract.
RFC 9728 Protected Resource Metadata for an HTTP MCP endpoint.
Normalized authentication result attached to the runtime context.
Hermetic bearer-token authenticator for server-side and local testing.
Handle returned for submitted background tasks.
Connected MCP client.
Context passed to server-initiated client callbacks.
MCP 2025-11-25 OAuth coordinator for Streamable HTTP clients.
Host boundary for interactive OAuth authorization.
Information passed to the host authorization callback.
Redacted error returned by the MCP OAuth client coordinator.
Storage boundary for MCP OAuth token sets.
Per-client in-memory OAuth token store.
Raised when a connected peer returns a syntactically valid JSON-RPC message that does not satisfy the negotiated MCP method schema.
Opaque handle for an asynchronous connected-client request.
Connected-client handle for one remote MCP task.
A server-initiated URL elicitation presented to a connected client.
Runtime-owned mutable component store.
Explicit request context passed to handlers.
Normalized error used by the operation pipeline and transports.
Friendly interaction helpers built on top of FastestMCP.Context.
Small server lifespan helper for startup and shutdown state.
Built-in middleware constructors.
Runtime operation struct passed through middleware and transforms.
Handle for a task owned by the connected MCP peer.
Prompt message helper with content normalization.
Canonical prompt result helper.
Central protocol version and capability helpers. Keep the active MCP protocol baseline in one place so server responses, client handshakes, and tests do not drift.
Shared wrapper for provider-backed component sources.
Immutable snapshot of request metadata exposed through FastestMCP.Context.
Convenience builder for binary resource content.
Resource content helper with MIME and metadata support.
Helper for serving directory listings as JSON resources.
Helper for serving file-backed resources.
Helper for serving HTTP-backed resources.
Canonical resource result helper.
Convenience builder for text resource content.
A client-declared MCP filesystem root.
Elixir-native helpers for MCP sampling.
Compile-once JSON Schema validation for FastestMCP.
An opaque, compiled JSON Schema validator.
A bounded error returned while compiling or validating JSON Schema.
Opt-in HTTPS resolver for remote JSON Schema resources.
Immutable server definition.
Module-based API for application-owned MCP servers.
Behaviour for session-scoped state backends.
In-memory session-state backend.
Behaviour for background-task storage backends.
ETS-backed in-memory task backend.
Canonical tool result helper.
Embeddable Plug app for FastestMCP's HTTP transport.
JSON-line stdio transport backed by the shared transport engine.
Minimal HTTP transport slice backed by the shared transport engine.