* Refactor FastMCPProxy into ProxyProvider
Move proxy functionality from custom manager classes to the Provider pattern:
- Create ProxyProvider that implements the Provider interface
- Move all proxy code to src/fastmcp/server/providers/proxy.py
- Keep FastMCPProxy as a convenience wrapper using ProxyProvider
- Add deprecation warning when importing from old location
- Convert handler classmethods to module-level functions
- Remove redundant get_* methods (base class defaults work)
* Remove unused Components class, simplify TaskComponents()
* Replace type: ignore[attr-defined] with isinstance assertions in tests
* Fix isinstance assertions in failing tests
- Fix enum test to check for ResponseEnum instead of str
- Fix binary resource test to check for BlobResourceContents instead of TextResourceContents
- Fix Root type tests to check attributes directly instead of isinstance checks
* Fix type errors without using type: ignore
- Remove execution methods from TransformingProvider (only handles transformations)
- Add execution methods to base Provider class with default implementations
- Fix type narrowing in tests using cast() instead of type: ignore
- Fix PromptResult type handling in prompt render tests
- Fix type narrowing in middleware test for arguments and structured_content
Simplifies the task support story for proxies and mounts:
- Mounts get full SEP-1686 task support (unchanged)
- Proxies explicitly forbid task execution
The cross-session task forwarding for proxies turned out to be complex
since each client connection creates a new server lifespan with a new
Docket context, and task keys include session_id. Rather than introduce
that complexity, proxies now explicitly refuse task-augmented execution.
Key changes:
- All proxy components (ProxyTool, ProxyPrompt, ProxyResource,
ProxyTemplate) now have task_config.mode="forbidden"
- Proxy tests verify forbidden behavior (sync execution works,
task=True returns error/raises McpError)
- Fixed prompt task handler to check hasattr(prompt, "task_config")
instead of isinstance(prompt, FunctionPrompt) so it applies to
ProxyPrompt too
- Added test suites for both proxy and mount task behavior
Also includes minor fixes:
- Fixed result.meta_ -> result.meta in ProxyTool.run()
- Fixed client handling of returned_immediately without taskId
- Bumped pydocket>=0.15.2
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
