wehub-resource-sync
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39 lines
1.5 KiB
Python
39 lines
1.5 KiB
Python
"""Prove the two error channels: is_error results return; MCPError raises."""
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from mcp_types import INVALID_PARAMS, TextContent
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from mcp import MCPError
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from mcp.client import Client
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from stories._harness import Target, run_client
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async def main(target: Target, *, mode: str = "auto") -> None:
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async with Client(target, mode=mode) as client:
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# Success: is_error defaults to False.
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ok = await client.call_tool("divide", {"a": 6, "b": 2})
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assert ok.is_error is False, ok
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assert isinstance(ok.content[0], TextContent)
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assert ok.content[0].text == "3.0"
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# Execution error: arrives as a *result* — await returns, no exception.
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failed = await client.call_tool("divide", {"a": 1, "b": 0})
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assert failed.is_error is True, "execution errors ride CallToolResult, not an exception"
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assert isinstance(failed.content[0], TextContent)
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# MCPServer prefixes "Error executing tool divide: ..."; lowlevel returns
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# the message verbatim. Assert the substring both produce.
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assert "cannot divide by zero" in failed.content[0].text
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# Protocol error: arrives as a raised MCPError.
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try:
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await client.call_tool("restricted", {})
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except MCPError as e:
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assert e.code == INVALID_PARAMS
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assert e.message == "this tool is gated"
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assert e.data == {"reason": "demo"}
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else:
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raise AssertionError("expected MCPError for a protocol-level rejection")
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if __name__ == "__main__":
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run_client(main)
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