Parse environment variable string in format KEY=VALUE.

Prepare the source (download, clone, install, etc). For sources that need preparation (e.g., git clone, download), this method perfor

Prepare the Python environment. Args: output_dir: If provided, creates a persistent uv project in this directory.

Convert various message formats to a list of SamplingMessage objects.

Push notification to session's queue (called from Docket worker). Used for elicitation-specific notifications (input_required, cancel) that n

Return indices of top_k documents sorted by BM25 score.

Read the resource content.

Read the resource content.

Read a file from the skill directory.

Register the server for a background task. Called at task-submission time so that background workers can resolve the correct (child) server f

Register a session for in-process background task access. Called automatically when a task is submitted to Docket. The session is stored as a

Register this component with docket for background execution. No-ops if task_config.mode is "forbidden". Subclasses override to regis

No-op: the child's actual template is registered via get_tasks().

Relay elicitation from a background task worker to the client. Called by the notification subscriber when it detects an input_required notifi

Remove resource template(s) from this provider's storage. Args: uri_template: The template URI pattern. version: If N

Remove a tool transformation. .. deprecated:: Tool transformations are now immutable. Use enable/disable controls instead.

Resolve dependencies for a FastMCP function. This function: 1. Filters out any dependency parameter names from user arguments (security)

Resolve hostname to IP addresses using DNS. Args: hostname: Hostname to resolve port: Port number (used for getaddrinfo) Ret

Standalone decorator to mark a function as an MCP resource. Returns the original function with metadata attached. Register with a server usin

Worker-level Docket dependency that restores the task-context snapshot. Runs before each fastmcp-owned task, populating the snapshot ContextVar

Return a model_copy with the per-tool URI and CSP stripped. Reads the hash from the tool's own meta. If no hash is found, returns the tool un

Execute the HTTP request using RequestDirector.

Start the full dev environment for a FastMCPApp server. Starts the user's MCP server on *mcp_port*, starts the Prefab dev UI on *dev_port* (w

Context manager that runs a FastMCP server in a separate process and returns the server URL. When the context manager is exited, the server p

Run a FastMCP 1.x server using async methods. Args: server: FastMCP 1.x server instance host: Host to bind to port: Port

Run a command with file watching and auto-reload. Args: cmd: Command to run as subprocess (should include --no-reload) reload_dir

Enter server lifespan and camp forever.

Implementation of Context.sample(). Send a sampling request to the client and await the response. This method runs to completion automaticall

Make a single LLM sampling call. This is a stateless function that makes exactly one LLM call and optionally executes any re

Store this snapshot as a single Redis key.

Scan a skill directory for all files.

Search the web.

Set the roots for the client. This does not automatically call `send_roots_list_changed`.

Set the sampling callback for the client.

Create the tools table and seed with example tools.

Set up OpenTelemetry tracing with OTLP export.

Show what's visible through a filtered server.

Display available tools in a panel.

Stop notification subscriber for a session. Called when session disconnects. Pending messages remain in queue for delivery if client reconnec

Store the first callback result and ignore subsequent requests.

Submit any component to Docket for background execution (SEP-1686). Unified handler for all component types. Called by component's internal m

Intercept a Prefab renderer URI and synthesize on demand.

Return fresh synthetic Prefab resources for all prefab tools. Pure.

Handle MCP 'tasks/cancel' request (SEP-1686). Cancels a running task, transitioning it to cancelled state. Args: server: FastMCP ser

Handle MCP 'tasks/get' request (SEP-1686). Args: server: FastMCP server instance params: Request params containing taskId Re

Handle MCP 'tasks/list' request (SEP-1686). Note: With client-side tracking, this returns minimal info. Args: server: FastMCP server

Handle MCP 'tasks/result' request (SEP-1686). Converts raw task return values to MCP types based on task type. Args: server: FastMCP

Convert the argument transform to a FastMCP argument transform.

Get image as a data URI.

Convert MCPConfig to dictionary format, preserving all fields.

Transform the prompt catalog. Override this method to replace, filter, or augment the prompt listing. The default implementation pass

Transform the resource template catalog. Override this method to replace, filter, or augment the template listing. The default implem

Transform the resource catalog. Override this method to replace, filter, or augment the resource listing. The default implementation

Transform the tool catalog. Override this method to replace, filter, or augment the tool listing. The default implementation passes t

Traverse schema tree, collecting $ref info and applying cleanups. The `in_schema` flag tracks whether the current node is reached via a

Use the client with a small delay to ensure overlap

Verify token against static token dictionary.

Verify Discord OAuth token by calling Discord's tokeninfo API.

Display version information and platform details.

Check if this issue was already auto-closed once.

Decorator to apply custom serialization to tool output.

Exit the context manager and reset the most recent token.