René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Consider extensible pattern for protocol flow-control exceptions","articleBody":"PR #1780 adds specific `except UrlElicitationRequiredError: raise` blocks in tool handlers to prevent this exception from being wrapped as a tool error.\n\nPer SEP-1036, `UrlElicitationRequiredError` is not a regular error—it's a protocol-level flow control mechanism equivalent to `elicitation/create`. It needs to propagate as a JSON-RPC error response.\n\nIf more continuation-style exceptions are added in the future, consider an attribute-based pattern:\n\n```python\nclass McpError(Exception):\n    propagate_through_tool_handlers: bool = False\n\nclass UrlElicitationRequiredError(McpError):\n    propagate_through_tool_handlers = True\n```\n\nFor now, YAGNI applies—we only have one such case.","author":{"url":"https://github.com/felixweinberger","@type":"Person","name":"felixweinberger"},"datePublished":"2025-12-15T17:56:58.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/1788/python-sdk/issues/1788"}