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44 lines
1.6 KiB
Python
44 lines
1.6 KiB
Python
"""Prompts primitive: register templates, list, render, complete an argument."""
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from mcp_types import Completion, CompletionArgument, CompletionContext, PromptReference, ResourceTemplateReference
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from mcp.server.mcpserver import MCPServer
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from mcp.server.mcpserver.prompts.base import AssistantMessage, Message, UserMessage
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from stories._hosting import run_server_from_args
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LANGUAGES = ["python", "pytorch", "rust", "go", "typescript"]
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def build_server() -> MCPServer:
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mcp = MCPServer("prompts-example")
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@mcp.prompt(title="Greeting")
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def greet(name: str) -> str:
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"""Ask the model to greet someone by name."""
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return f"Write a one-line greeting for {name}."
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@mcp.prompt(title="Code Review")
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def code_review(language: str, code: str) -> list[Message]:
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"""Ask the model to review a code snippet."""
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return [
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UserMessage(f"Review this {language} code for bugs and idioms:\n\n{code}"),
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AssistantMessage("I'll review it. Let me read through the code first."),
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]
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@mcp.completion()
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async def complete(
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ref: PromptReference | ResourceTemplateReference,
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argument: CompletionArgument,
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context: CompletionContext | None,
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) -> Completion | None:
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if isinstance(ref, PromptReference) and ref.name == "code_review" and argument.name == "language":
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matches = [lang for lang in LANGUAGES if lang.startswith(argument.value)]
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return Completion(values=matches, total=len(matches), has_more=False)
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return None
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return mcp
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if __name__ == "__main__":
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run_server_from_args(build_server)
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