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AWS MCP Integration for LangChain

Connect AWS to LangChain through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

8 functions 7 read 1 write Bearer token auth
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Connect AWS to LangChain

Bridge LangChain agents to local KosmoKrator integration tools through MCP or headless CLI calls.

Use the MCP gateway when the agent should discover tools, or wrap kosmo integrations:call for fixed chains. The gateway is local, scoped to this integration, and starts with --write=deny so LangChain can inspect read-capable tools without receiving write access by default.

AWS MCP Config for LangChain

Keep the gateway scoped to the integration and operation class needed by the chain.

{
  "mcpServers": {
    "kosmokrator-aws": {
      "type": "stdio",
      "command": "kosmo",
      "args": [
        "mcp:serve",
        "--integration=aws",
        "--write=deny"
      ]
    }
  }
}

Run the Gateway Manually

kosmokrator mcp:serve --integration=aws --write=deny

Why Use KosmoKrator Here

Scoped tools

Expose only AWS instead of a broad multi-service tool list.

Local credentials

Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.

Write policy

Start read-only, then opt into ask or allow for trusted workspaces.

AWS Tools Visible to LangChain

LangChain sees stable MCP tool names generated from the AWS integration catalog.

MCP toolSource functionTypeDescription
integration__aws__aws_list_s3_buckets aws.aws_list_s3_buckets Read List all S3 buckets in the AWS account. Returns bucket names, creation dates, and regions.
integration__aws__aws_list_ec2_instances aws.aws_list_ec2_instances Read Describe EC2 instances in the AWS account. Returns instance IDs, types, states, and metadata. Supports filtering by instance IDs, states, or tags.
integration__aws__aws_list_lambda_functions aws.aws_list_lambda_functions Read List all Lambda functions in the AWS account. Returns function names, runtimes, descriptions, and configuration.
integration__aws__aws_invoke_lambda aws.aws_invoke_lambda Write Invoke an AWS Lambda function with an optional payload. Supports synchronous (RequestResponse) and asynchronous (Event) invocation modes.
integration__aws__aws_list_dynamodb_tables aws.aws_list_dynamodb_tables Read List all DynamoDB tables in the AWS account. Returns table names and can be used with pagination to enumerate all tables.
integration__aws__aws_get_cloudwatch_metrics aws.aws_get_cloudwatch_metrics Read Get CloudWatch metric data for AWS resources. Supports querying metrics by namespace, metric name, dimensions, and time range with configurable statistics and periods.
integration__aws__aws_list_sns_topics aws.aws_list_sns_topics Read List all SNS notification topics in the AWS account. Returns topic ARNs and names.
integration__aws__aws_get_current_user aws.aws_get_current_user Read Get the current IAM user identity. Returns user ARN, account ID, and user ID. Useful for verifying credentials and understanding which AWS account is being accessed.

Related AWS Pages

AWS CLIUse direct JSON commands instead of MCP discovery. AWS MCPFull gateway reference and MCP tool names. KosmoKrator for LangChainClient-level gateway setup.