# Get a prompt from an AgentCore gateway To get a specific prompt, make a POST request to the gateway’s MCP endpoint and specify `prompts/get` as the method in the request body, name of the prompt, and the arguments: **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} ``` On version `2026-07-28`, each request carries the `MCP-Protocol-Version` header, the `Mcp-Method` and `Mcp-Name` request-metadata headers, and the `_meta` version fields in the body. ``` 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} ${RequestBody} ``` **Note** The gateway accepts only the MCP protocol versions listed in the `supportedVersions` field of its `protocolConfiguration.mcp` configuration. To use version `2026-07-28`, make sure that your gateway’s `supportedVersions` includes it. You can change the supported versions with the [UpdateGateway](https://docs.aws.amazon.com/bedrock-agentcore-control/latest/APIReference/API_UpdateGateway.html) API. Replace the following values: + `${GatewayEndpoint}` – The URL of the gateway, as provided in the response of the [CreateGateway](https://docs.aws.amazon.com/bedrock-agentcore-control/latest/APIReference/API_CreateGateway.html) API. + `${Authorization header}` – The authorization credentials from the identity provider when you set up [inbound authorization](gateway-inbound-auth.md). + `${McpProtocolVersion}` – The MCP protocol version for the request, such as `2025-11-25`. The version must be one that your gateway supports. + `${PromptName}` – The name of the prompt, matching the `name` in the request body. + `${RequestBody}` – The JSON payload of the request body, as specified in [Getting a prompt](https://modelcontextprotocol.io/specification/2025-06-18/server/prompts#getting-a-prompt) in the [Model Context Protocol (MCP)](https://modelcontextprotocol.io/docs/getting-started/intro) . Include `prompts/get` as the `method` and include the `name` of the prompt and its `arguments`. On version `2026-07-28`, also include the `_meta` version fields in `params`. The response returns the rendered prompt as an array of messages, each with a role and content. **Note** The `prompts/get` operation proxies the request live to the downstream MCP server. The prompt name must include the target prefix (for example, `myTarget___myPrompt`). ## Code samples for getting a prompt To see examples of getting a prompt from the gateway, select one of the following methods: **Example** The following curl request shows an example request to get a prompt called `myTarget___code_review` through a gateway with the ID `mygateway-abcdefghij`. Set the `MCP-Protocol-Version` header to a version that your gateway supports. ``` 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\")" } } }' ``` On version `2026-07-28`, include the `Mcp-Method` and `Mcp-Name` request-metadata headers and the `_meta` version fields in the body. The `MCP-Protocol-Version` header must match `_meta.io.modelcontextprotocol/protocolVersion`. Your gateway’s `supportedVersions` must include `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": {} } } }' ``` Set the `MCP-Protocol-Version` header to a version that your gateway supports. ``` 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)) ``` On version `2026-07-28`, include the `Mcp-Method` and `Mcp-Name` request-metadata headers and the `_meta` version fields in the body. The `MCP-Protocol-Version` header must match `_meta.io.modelcontextprotocol/protocolVersion`. Your gateway’s `supportedVersions` must include `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://${GatewayEndpoint}/mcp" token = "your_bearer_token_here" prompt_name = "myTarget___code_review" prompt_arguments = { "language": "python", "code": "print('hello')" } await execute_mcp( url=url, token=token, prompt_name=prompt_name, prompt_arguments=prompt_arguments ) if __name__ == "__main__": asyncio.run(main()) ``` NOTE: LangGraph MCP adapter prompt support might vary. Use the MCP Client approach shown previously for the most reliable `prompts/get` implementation. ``` import asyncio from mcp import ClientSession from mcp.client.streamable_http import streamablehttp_client async def get_prompt(url, token, prompt_name, arguments): headers = {"Authorization": f"Bearer {token}"} async with streamablehttp_client(url=url, headers=headers) as ( read_stream, write_stream, callA ): async with ClientSession(read_stream, write_stream) as session: await session.initialize() response = await session.get_prompt( name=prompt_name, arguments=arguments ) for message in response.messages: print(f"{message.role}: {message.content}") asyncio.run(get_prompt( "https://${GatewayEndpoint}/mcp", "${AccessToken}", "myTarget___code_review", {"language": "python", "code": "print('hello')"} )) ``` ## Errors The `prompts/get` operation can return the following types of errors: + Errors returned as part of the HTTP status code: **AuthenticationError** The request failed due to invalid authentication credentials. **HTTP Status Code** : 401 **AuthorizationError** The caller does not have permission to get the prompt. **HTTP Status Code** : 403 **ResourceNotFoundError** The specified prompt does not exist. **HTTP Status Code** : 404 **ValidationError** The provided arguments do not satisfy the prompt’s required arguments. **HTTP Status Code** : 400 **InternalServerError** An internal server error occurred. **HTTP Status Code** : 500 + MCP errors. For more information about these types of errors, see [Prompts](https://modelcontextprotocol.io/specification/2025-06-18/server/prompts) in the [Model Context Protocol (MCP)](https://modelcontextprotocol.io/docs/getting-started/intro) documentation.