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Rubén De la Torre Vico
975c3f082d
Adds ProwlerMCP, the FastMCP subclass every sub-server is now built
from. Its tool() wraps whatever it registers -- the decorator forms and
the direct call BaseTool uses -- so a failure leaves any tool as a
ToolError, which the client reads as isError: true.
Applied at the base class rather than by hand because forgetting it is
silent: every server now sets mask_error_details=True, so an unwrapped
tool would answer "Error calling tool 'x'" and nothing else. ToolError
bypasses that masking, which is what lets the servers mask by default
and still say something useful.
No tool changes yet. Tools that still return {"error": ...} keep working
exactly as before; they are converted surface by surface in the PRs
above this one. What changes here is that a failure which used to escape
as a raw exception is now described by render_tool_error.
The rules this establishes are in AGENTS.md and the developer guide,
so the conversions have something to be checked against.