Module server 

MCP server implementation.

Modules

adaptersNon-WebAssembly

Transport adapter patterns for connecting protocol handlers to various transports.

authNon-WebAssembly

Server-side authentication providers and middleware.

axum_routerstreamable-http

Axum Router convenience function for secure MCP server hosting. Axum Router convenience function for MCP servers.

batchNon-WebAssembly

Server-side batch request handling.

builderNon-WebAssembly

Builder pattern for constructing ServerCore instances.

builder_middleware_executorNon-WebAssembly

Builder-scoped middleware executor for workflow registration. Builder-scoped middleware executor for workflow registration.

cancellationNon-WebAssembly

Cancellation token infrastructure and the canonical RequestHandlerExtra request-context struct handed to every tool, prompt, and resource handler.

coreNon-WebAssembly

Transport-independent MCP server core implementation.

dynamicNon-WebAssembly

Dynamic server management for runtime configuration changes.

dynamic_resourcesNon-WebAssembly

Dynamic resource provider system for pattern-based resource routing. Dynamic resource provider system for pattern-based resource routing.

elicitationNon-WebAssembly

User input elicitation support for MCP servers (MCP 2025-11-25).

error_codesNon-WebAssembly

Standard error codes for validation with client elicitation support. Standard error codes for validation with client elicitation support

http_middlewareNon-WebAssembly

Server-side HTTP middleware for request/response interception.

limits

Configurable payload and resource limits for MCP servers.

mcp_appsmcp-apps and non-WebAssembly

MCP Apps Extension - Interactive UI support for multiple MCP hosts.

middleware_executorNon-WebAssembly

Middleware executor abstraction for consistent tool execution. Middleware executor abstraction for tool execution.

notification_debouncerNon-WebAssembly

Advanced notification debouncing system for MCP servers.

observabilityNon-WebAssembly

Observability infrastructure for tracing, metrics, and logging. Observability infrastructure for MCP servers.

path_validationNon-WebAssembly

Cross-platform path validation with security constraints. Cross-platform path validation with security constraints

presetNon-WebAssembly

Server middleware presets with sensible defaults.

progressNon-WebAssembly

Progress reporting support for long-running operations. Progress reporting support for long-running operations.

resource_watcherresource-watcher and non-WebAssembly

Resource watcher for monitoring file system changes.

rootsNon-WebAssembly

Server-side roots management.

schema_utilsschema-generation

Schema utilities for normalizing and inlining JSON schemas. Schema utilities for normalizing and inlining JSON schemas

schema_validationschema-validation

Runtime enforcement of a tool’s declared inputSchema at tools/call time (Phase 128, D-01).

simple_promptNon-WebAssembly

Simple prompt implementations with metadata support. Simple prompt implementations with metadata support.

simple_resourcesNon-WebAssembly

Simple resource implementations with builder pattern support. Simple resource implementations with builder pattern support.

simple_toolNon-WebAssembly

Simple tool implementations with schema support. Simple tool implementations with schema support.

stateNon-WebAssembly

State extractor for #[mcp_tool] shared state injection. State extractor for MCP tools.

streamable_http_serverstreamable-http and non-WebAssembly

Streamable HTTP server implementation for MCP.

subscriptionsNon-WebAssembly

Server-side resource subscription management.

task_storeNon-WebAssembly

SDK-level task store trait and in-memory implementation. SDK-level task store trait and in-memory implementation.

tasksNon-WebAssembly

Task routing trait for MCP Tasks integration. Task routing trait for MCP Tasks integration.

tool_middlewareNon-WebAssembly

Tool middleware for cross-cutting concerns in tool execution. Tool middleware for cross-cutting concerns in tool execution.

tower_layersstreamable-http

Tower middleware layers for MCP HTTP security (DNS rebinding, security headers). Tower middleware layers for MCP server security.

transportNon-WebAssembly

Server-specific transport implementations.

typed_promptNon-WebAssembly

Typed prompt implementations with automatic argument schema generation. Type-safe prompt implementations with automatic argument schema generation.

typed_toolNon-WebAssembly

Typed tool implementations with automatic schema generation. Type-safe tool implementations with automatic schema generation.

uiNon-WebAssembly

UI resource implementations for MCP Apps Extension (SEP-1865). UI resource builder for MCP Apps Extension (SEP-1865).

workflowNon-WebAssembly

Workflow-based prompt system with type-safe handles and ergonomic builders. Workflow-based prompt system

Structs

ServerNon-WebAssembly

MCP server implementation.

ServerBuilderNon-WebAssembly

Builder for creating servers.

Enums

ToolOutputNon-WebAssembly

Output of a ToolHandler call: either a plain value the server wraps into a CallToolResult, or a fully-formed CallToolResult the handler owns end-to-end.

Traits

McpServerNon-WebAssembly

Trait for types annotated with #[mcp_server].

PromptHandler

Handler for prompt generation.

ResourceHandler

Handler for resource access.

SamplingHandler

Handler for message sampling (LLM operations).

ToolHandler

Handler for tool execution.