本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。 # 从 AgentCore 网关获取提示 要获得特定的提示，请向网关的 MCP 端点发出 POST 请求，并在请求正文中指定`prompts/get`方法、提示名称和参数： **Example** ``` POST /mcp HTTP/1.1 Host: ${GatewayEndpoint} Accept: application/json, text/event-stream Content-Type: application/json Authorization: ${Authorization header} MCP-Protocol-Version: ${McpProtocolVersion} ${RequestBody} ``` 在版本上`2026-07-28`，每个请求都带有`MCP-Protocol-Version`标头、`Mcp-Method`和`Mcp-Name`请求元数据标头以及正`_meta`文中的版本字段。 ``` POST /mcp HTTP/1.1 Host: ${GatewayEndpoint} Accept: application/json, text/event-stream Content-Type: application/json Authorization: ${Authorization header} MCP-Protocol-Version: 2026-07-28 Mcp-Method: prompts/get Mcp-Name: ${PromptName} ${RequestBody} ``` **注意** 网关仅接受其`protocolConfiguration.mcp`配置`supportedVersions`字段中列出的 MCP 协议版本。要使用版本`2026-07-28`，请确保您的网关`supportedVersions`包含该版本。您可以使用 [ UpdateGateway ](https://docs.amazonaws.cn/bedrock-agentcore-control/latest/APIReference/API_UpdateGateway.html) API 更改支持的版本。 替换以下值： + `${GatewayEndpoint}`— 网关的 URL，如 [ CreateGateway ](https://docs.amazonaws.cn/bedrock-agentcore-control/latest/APIReference/API_CreateGateway.html) API 的响应中所提供。 + `${Authorization header}`— 设置[入站授权时身份提供商提供的授权凭证](gateway-inbound-auth.md)。 + `${McpProtocolVersion}`— 请求的 MCP 协议版本，例如`2025-11-25`。该版本必须是您的网关支持的版本。 + `${PromptName}`— 提示的名称，与请求正文`name`中的名称相匹配。 + `${RequestBody}`— 请求正文的 JSON 负载，如在[模型上下文协议 (MCP) [https://modelcontextprotocol.io/specification/2025-06-18/server/prompts#getting-a-prompt](https://modelcontextprotocol.io/specification/2025-06-18/server/prompts#getting-a-prompt) 中](https://modelcontextprotocol.io/docs/getting-started/intro)获取提示中所指定。将提示符`method`及其包含`prompts/get`为`arguments`。`name`在版本中`2026-07-28`，还要包括`_meta`版本字段`params`。 响应将呈现的提示作为一组消息返回，每条消息都有角色和内容。 **注意** 该`prompts/get`操作将请求实时代理到下游 MCP 服务器。提示名称必须包含目标前缀（例如，`myTarget___myPrompt`）。 ## 获取提示的代码示例 要查看从网关获取提示的示例，请选择以下方法之一： **Example** 以下 curl 请求显示了`myTarget___code_review`通过网关调用 ID `mygateway-abcdefghij` 的提示的示例请求。将标`MCP-Protocol-Version`头设置为您的网关支持的版本。 ``` curl -X POST \ https://mygateway-abcdefghij.gateway.bedrock-agentcore.us-west-2.amazonaws.com/mcp \ -H "Accept: application/json, text/event-stream" \ -H "Content-Type: application/json" \ -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \ -H "MCP-Protocol-Version: 2025-11-25" \ -d '{ "jsonrpc": "2.0", "id": "get-prompt-request", "method": "prompts/get", "params": { "name": "myTarget___code_review", "arguments": { "language": "python", "code": "print(\"hello\")" } } }' ``` 在版本上`2026-07-28`，在正文中包括`Mcp-Method`和`Mcp-Name`请求元数据标头以及`_meta`版本字段。标`MCP-Protocol-Version`题必须匹配`_meta.io.modelcontextprotocol/protocolVersion`。您的网关`supportedVersions`必须包括`2026-07-28`。 ``` curl -X POST \ https://mygateway-abcdefghij.gateway.bedrock-agentcore.us-west-2.amazonaws.com/mcp \ -H "Accept: application/json, text/event-stream" \ -H "Content-Type: application/json" \ -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \ -H "MCP-Protocol-Version: 2026-07-28" \ -H "Mcp-Method: prompts/get" \ -H "Mcp-Name: myTarget___code_review" \ -d '{ "jsonrpc": "2.0", "id": "get-prompt-request", "method": "prompts/get", "params": { "name": "myTarget___code_review", "arguments": { "language": "python", "code": "print(\"hello\")" }, "_meta": { "io.modelcontextprotocol/protocolVersion": "2026-07-28", "io.modelcontextprotocol/clientInfo": { "name": "my-agent", "version": "1.0.0" }, "io.modelcontextprotocol/clientCapabilities": {} } } }' ``` 将标`MCP-Protocol-Version`头设置为您的网关支持的版本。 ``` import requests import json def get_prompt(gateway_url, access_token, prompt_name, arguments): headers = { "Content-Type": "application/json", "Authorization": f"Bearer {access_token}", "MCP-Protocol-Version": "2025-11-25" } payload = { "jsonrpc": "2.0", "id": "get-prompt-request", "method": "prompts/get", "params": { "name": prompt_name, "arguments": arguments } } response = requests.post(gateway_url, headers=headers, json=payload) return response.json() # Example usage gateway_url = "https://${GatewayEndpoint}/mcp" # Replace with your actual gateway endpoint access_token = "${AccessToken}" # Replace with your actual access token result = get_prompt( gateway_url, access_token, "myTarget___code_review", # Replace with {targetName}___{promptName} {"language": "python", "code": "print('hello')"} ) print(json.dumps(result, indent=2)) ``` 在版本上`2026-07-28`，在正文中包括`Mcp-Method`和`Mcp-Name`请求元数据标头以及`_meta`版本字段。标`MCP-Protocol-Version`题必须匹配`_meta.io.modelcontextprotocol/protocolVersion`。您的网关`supportedVersions`必须包括`2026-07-28`。 ``` import requests import json def get_prompt(gateway_url, access_token, prompt_name, arguments): headers = { "Content-Type": "application/json", "Authorization": f"Bearer {access_token}", "MCP-Protocol-Version": "2026-07-28", "Mcp-Method": "prompts/get", "Mcp-Name": prompt_name } payload = { "jsonrpc": "2.0", "id": "get-prompt-request", "method": "prompts/get", "params": { "name": prompt_name, "arguments": arguments, "_meta": { "io.modelcontextprotocol/protocolVersion": "2026-07-28", "io.modelcontextprotocol/clientInfo": {"name": "my-agent", "version": "1.0.0"}, "io.modelcontextprotocol/clientCapabilities": {} } } } response = requests.post(gateway_url, headers=headers, json=payload) return response.json() # Example usage gateway_url = "https://${GatewayEndpoint}/mcp" # Replace with your actual gateway endpoint access_token = "${AccessToken}" # Replace with your actual access token result = get_prompt( gateway_url, access_token, "myTarget___code_review", # Replace with {targetName}___{promptName} {"language": "python", "code": "print('hello')"} ) print(json.dumps(result, indent=2)) ``` ``` from mcp import ClientSession from mcp.client.streamable_http import streamablehttp_client import asyncio async def execute_mcp( url, token, prompt_name, prompt_arguments, headers=None ): default_headers = { "Authorization": f"Bearer {token}" } headers = {**default_headers, **(headers or {})} async with streamablehttp_client( url=url, headers=headers, ) as ( read_stream, write_stream, callA, ): async with ClientSession(read_stream, write_stream) as session: # 1. Perform initialization handshake print("Initializing MCP...") _init_response = await session.initialize() print(f"MCP Server Initialize successful! - {_init_response}") # 2. Get specific prompt print(f"Getting prompt: {prompt_name}") prompt_response = await session.get_prompt( name=prompt_name, arguments=prompt_arguments ) print(f"Prompt response: {prompt_response}") return prompt_response async def main(): url = "https://${GatewayEndpoint}/mcp" token = "your_bearer_token_here" prompt_name = "myTarget___code_review" prompt_arguments = { "language": "python", "code": "print('hello')" } await execute_mcp( url=url, token=token, prompt_name=prompt_name, prompt_arguments=prompt_arguments ) if __name__ == "__main__": asyncio.run(main()) ``` 注意： LangGraph MCP 适配器的提示支持可能会有所不同。使用前面显示的 MCP 客户端方法，实现最可靠的`prompts/get`实现。 ``` import asyncio from mcp import ClientSession from mcp.client.streamable_http import streamablehttp_client async def get_prompt(url, token, prompt_name, arguments): headers = {"Authorization": f"Bearer {token}"} async with streamablehttp_client(url=url, headers=headers) as ( read_stream, write_stream, callA ): async with ClientSession(read_stream, write_stream) as session: await session.initialize() response = await session.get_prompt( name=prompt_name, arguments=arguments ) for message in response.messages: print(f"{message.role}: {message.content}") asyncio.run(get_prompt( "https://${GatewayEndpoint}/mcp", "${AccessToken}", "myTarget___code_review", {"language": "python", "code": "print('hello')"} )) ``` ## 错误 该`prompts/get`操作可能会返回以下类型的错误： + 作为 HTTP 状态码的一部分返回的错误： **AuthenticationError** 由于身份验证凭据无效，请求失败。 **HTTP 状态码**：401 **AuthorizationError** 呼叫者无权获得提示。 **HTTP 状态码**：403 **ResourceNotFoundError** 指定的提示符不存在。 **HTTP 状态码**：404 **ValidationError** 提供的参数不满足提示符所需的参数。 **HTTP 状态码**：400 **InternalServerError** 发生内部服务器错误。 **HTTP 状态码**：500 + MCP 错误。有关这些类型错误的更多信息，请参阅[模型上下文协议 (MCP) [ 中的](https://modelcontextprotocol.io/specification/2025-06-18/server/prompts)提示](https://modelcontextprotocol.io/docs/getting-started/intro)文档。