AWS MCP Server

Instructions

Implementation Reference

• src/mcp_server_aws/server.py:230-235 (handler)

  Executes the dynamodb_item_update tool by invoking the DynamoDB boto3 client's update_item method with the provided table_name, key, and AttributeUpdates=item from the arguments.

  elif name == "dynamodb_item_update":
      response = dynamodb_client.update_item(
          TableName=arguments["table_name"],
          Key=arguments["key"],
          AttributeUpdates=arguments["item"]
      )

• src/mcp_server_aws/tools.py:231-252 (schema)

  Defines the Tool object for dynamodb_item_update, including its input schema requiring table_name (string), key (object), and item (object). This is used for validation and returned in list_tools.

  Tool(
      name="dynamodb_item_update",
      description="Update an item in a DynamoDB table",
      inputSchema={
          "type": "object",
          "properties": {
              "table_name": {
                  "type": "string",
                  "description": "Name of the DynamoDB table"
              },
              "key": {
                  "type": "object",
                  "description": "Key to identify the item"
              },
              "item": {
                  "type": "object",
                  "description": "Updated item data"
              }
          },
          "required": ["table_name", "key", "item"]
      }
  ),

• src/mcp_server_aws/server.py:136-140 (registration)

  Registers the dynamodb_item_update tool (among others) with the MCP server by returning get_aws_tools() which includes it.

  async def list_tools() -> list[Tool]:
      """List available AWS tools"""
      logger.debug("Handling list_tools request")
      return get_aws_tools()