wehub-resource-sync
41 lines
1.1 KiB
Python
41 lines
1.1 KiB
Python
"""Minimal stdio MCP server used by :mod:`tests.tools.test_mcp_stdio_e2e`.
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Exposes a single ``echo`` tool that returns its ``text`` argument.
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Kept deterministic and dependency-free so the e2e test doesn't need
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external services, credentials, or network access — just a Python
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interpreter that can ``pip install mcp``.
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Usage:
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python tests/tools/fixtures/echo_stdio_mcp_server.py
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``FastMCP.run()`` defaults to stdio transport, so the process
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reads/writes MCP protocol frames on stdin/stdout.
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"""
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from __future__ import annotations
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from mcp.server.fastmcp import FastMCP
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mcp = FastMCP("echo-test")
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@mcp.tool()
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def echo(text: str) -> str:
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"""
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Return *text* verbatim, prefixed with ``"echo: "``.
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Prefix is present so the test assertion can distinguish the
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tool's output from any echo of the request that might come
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from MCP machinery or logging — a bare passthrough would
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match too loosely.
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:param text: The string to echo back, e.g. ``"hello"``.
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:returns: ``f"echo: {text}"``.
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"""
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return f"echo: {text}"
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if __name__ == "__main__":
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mcp.run()
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