fix(tools): shim mcp 1.x Server decorators so browser_use constructs under mcp 2.x

[Lin-Artificial]

HUMAN:

We run the SDK in an environment where mcp 2.x is installed; there the browser tool cannot be constructed at all (AttributeError: 'Server' object has no attribute 'list_tools'). This shim has been running locally as a manual patch and is verified working; submitting it upstream so upgrades stop requiring the manual patch. (Submitted by @Lin-Artificial; prepared on his behalf by an AI agent.)

---

AGENT:

Why

browser_use (<= 0.13.x) pins mcp==1.26.0 and registers MCP handlers in BrowserUseServer.__init__ using the decorator-style API (@server.list_tools(), @server.call_tool(), ...) that mcp 2.x removed in favor of constructor-based handlers plus add_request_handler(). OpenHands never speaks MCP to this server (it calls the server's private methods directly), but construction still executes the decorator registrations, so under mcp 2.x the browser tool fails with AttributeError: 'Server' object has no attribute 'list_tools'.

Summary

• Re-implement the four removed mcp 1.x decorators (list_tools, call_tool, list_resources, list_prompts) on top of add_request_handler() inside logging_fix, preserving the semantics browser_use relies on (call_tool wraps results in CallToolResult, mirroring mcp 1.x).
• Under mcp 1.x the shim detects the native decorators and is a no-op; tracked via warn_cleanup(cleanup_by="2.0.0"), alongside the existing browser_use logging workaround (Remove browser_use logging monkey-patch once fixed upstream (deadline: v2.0.0) #4072).
• Add tests/tools/browser_use/test_logging_fix.py covering handler registration, result wrapping, mcp 1.x no-op detection, and end-to-end CustomBrowserUseServer construction.

Issue Number

Related: #4072 (tracks removal of the browser_use workarounds)

How to Test

Verified in an environment with mcp 2.0.0 installed:

1. Reproduce on unpatched code:

   from openhands.tools.browser_use.server import CustomBrowserUseServer
   CustomBrowserUseServer(session_timeout_minutes=1)
   # AttributeError: 'Server' object has no attribute 'list_tools'

2. With the shim applied, the same snippet constructs successfully.
3. New tests plus existing suite:

   pytest tests/tools/browser_use/test_logging_fix.py -v
   # 4 passed, 1 skipped (mcp-1.x-only case)
   
   pytest tests/tools/browser_use/ --ignore=tests/tools/browser_use/test_browser_executor_e2e.py
   # 132 passed, 1 skipped
   

4. ruff check / ruff format --check clean (ruff 0.12.10).

CI runs the pinned environment (mcp 1.26.0): shim-functional tests self-skip there, while the no-op and construction tests pass — the suite is green under both mcp majors.

Video/Screenshots

N/A — headless tooling change; see test commands and outputs above.

Type

• Bug fix

Notes

• browser_use 0.13.7 (latest release) still pins mcp==1.26.0, so this incompatibility is current.
• The shim only activates when mcp.server.lowlevel.server.Server lacks the decorator attributes; zero behavior change for existing mcp 1.x installs.

This PR was prepared by an AI agent (OpenHands) on behalf of @Lin-Artificial.

[all-hands-bot]

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