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| 1 | +#!/usr/bin/env python3 |
| 2 | +"""Skybridge-focused MCP test server exposing multiple scenarios.""" |
| 3 | + |
| 4 | +from __future__ import annotations |
| 5 | + |
| 6 | +import argparse |
| 7 | +from typing import TYPE_CHECKING |
| 8 | + |
| 9 | +from mcp.server.fastmcp import FastMCP |
| 10 | + |
| 11 | +if TYPE_CHECKING: |
| 12 | + from mcp.types import Tool as MCPTool |
| 13 | + |
| 14 | +SKYBRIDGE_MIME_TYPE = "text/html+skybridge" |
| 15 | + |
| 16 | + |
| 17 | +class SkybridgeTestServer(FastMCP): |
| 18 | + """FastMCP server that decorates tool listings with Skybridge meta tags.""" |
| 19 | + |
| 20 | + def __init__(self, *args, tool_templates: dict[str, str] | None = None, **kwargs) -> None: |
| 21 | + super().__init__(*args, **kwargs) |
| 22 | + self._tool_templates = tool_templates or {} |
| 23 | + |
| 24 | + async def list_tools(self) -> list[MCPTool]: |
| 25 | + tools = await super().list_tools() |
| 26 | + for tool in tools: |
| 27 | + template = self._tool_templates.get(tool.name) |
| 28 | + if template: |
| 29 | + tool.meta = {"openai/outputTemplate": template} |
| 30 | + return tools |
| 31 | + |
| 32 | + |
| 33 | +def build_valid_scenario() -> SkybridgeTestServer: |
| 34 | + server = SkybridgeTestServer( |
| 35 | + name="Skybridge Valid Scenario", |
| 36 | + tool_templates={"render_valid_widget": "ui://skybridge/widget-valid"}, |
| 37 | + ) |
| 38 | + |
| 39 | + @server.tool(name="render_valid_widget", description="Return HTML for a valid Skybridge widget") |
| 40 | + def render_valid_widget() -> str: |
| 41 | + return "<html><body><h1>Valid Skybridge Widget</h1></body></html>" |
| 42 | + |
| 43 | + @server.resource( |
| 44 | + "ui://skybridge/widget-valid", |
| 45 | + description="Valid Skybridge UI resource", |
| 46 | + mime_type=SKYBRIDGE_MIME_TYPE, |
| 47 | + ) |
| 48 | + def valid_widget_resource() -> str: |
| 49 | + return "<html><body><h1>Valid Skybridge Widget</h1></body></html>" |
| 50 | + |
| 51 | + return server |
| 52 | + |
| 53 | + |
| 54 | +def build_invalid_mime_scenario() -> SkybridgeTestServer: |
| 55 | + server = SkybridgeTestServer( |
| 56 | + name="Skybridge Invalid MIME Scenario", |
| 57 | + tool_templates={"render_invalid_widget": "ui://skybridge/widget-invalid"}, |
| 58 | + ) |
| 59 | + |
| 60 | + @server.tool( |
| 61 | + name="render_invalid_widget", description="Return HTML that lacks the Skybridge MIME type" |
| 62 | + ) |
| 63 | + def render_invalid_widget() -> str: |
| 64 | + return "<html><body><h1>Invalid MIME</h1></body></html>" |
| 65 | + |
| 66 | + @server.resource( |
| 67 | + "ui://skybridge/widget-invalid", |
| 68 | + description="Resource served with a non-Skybridge mime type", |
| 69 | + mime_type="text/html", |
| 70 | + ) |
| 71 | + def invalid_widget_resource() -> str: |
| 72 | + return "<html><body><h1>Invalid MIME</h1></body></html>" |
| 73 | + |
| 74 | + return server |
| 75 | + |
| 76 | + |
| 77 | +def build_missing_resource_scenario() -> SkybridgeTestServer: |
| 78 | + server = SkybridgeTestServer( |
| 79 | + name="Skybridge Missing Resource Scenario", |
| 80 | + tool_templates={"render_missing_widget": "ui://skybridge/widget-missing"}, |
| 81 | + ) |
| 82 | + |
| 83 | + @server.tool( |
| 84 | + name="render_missing_widget", |
| 85 | + description="Advertises a template that does not exist on the server", |
| 86 | + ) |
| 87 | + def render_missing_widget() -> str: |
| 88 | + return "<html><body><h1>Missing Resource</h1></body></html>" |
| 89 | + |
| 90 | + @server.resource( |
| 91 | + "ui://skybridge/orphan-widget", |
| 92 | + description="Orphaned Skybridge resource with no tool linkage", |
| 93 | + mime_type=SKYBRIDGE_MIME_TYPE, |
| 94 | + ) |
| 95 | + def orphan_widget_resource() -> str: |
| 96 | + return "<html><body><h1>Orphan Widget</h1></body></html>" |
| 97 | + |
| 98 | + return server |
| 99 | + |
| 100 | + |
| 101 | +SCENARIO_BUILDERS = { |
| 102 | + "valid": build_valid_scenario, |
| 103 | + "invalid-mime": build_invalid_mime_scenario, |
| 104 | + "missing-resource": build_missing_resource_scenario, |
| 105 | +} |
| 106 | + |
| 107 | + |
| 108 | +def main() -> None: |
| 109 | + parser = argparse.ArgumentParser(description="Skybridge MCP test server scenarios") |
| 110 | + parser.add_argument( |
| 111 | + "scenario", |
| 112 | + choices=SCENARIO_BUILDERS.keys(), |
| 113 | + help="Which Skybridge scenario to run", |
| 114 | + ) |
| 115 | + args = parser.parse_args() |
| 116 | + |
| 117 | + server_factory = SCENARIO_BUILDERS[args.scenario] |
| 118 | + app = server_factory() |
| 119 | + app.run(transport="stdio") |
| 120 | + |
| 121 | + |
| 122 | +if __name__ == "__main__": |
| 123 | + main() |
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