AWS Lambda

Name: AWS Lambda API
Brand: AWS Lambda
Availability: InStock

★ Only Publicly Available OpenAPI DocumentCloud InfrastructureServerlesshmac66 EndpointsREST

For Agents

Deploy, configure, and invoke serverless functions, manage event source mappings, and control concurrency, versions, and aliases on AWS.

Connect the AWS Lambda to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the AWS Lambda, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Install Jentic One Beta (Self-Hosted)

Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with AWS Lambda API.

Create and update Lambda functions via /2015-03-31/functions

Invoke functions synchronously or asynchronously through /2015-03-31/functions/{FunctionName}/invocations

Publish versions and manage weighted aliases for blue/green deployments

Wire SQS, Kinesis, DynamoDB Streams, and Kafka triggers via event source mappings

GET STARTED

Start building with AWS Lambda API

Explore with Jentic

View OpenAPI Document

Jentic publishes the only available OpenAPI document for AWS Lambda, keeping it validated and agent-ready.

Jentic publishes the only available OpenAPI specification for AWS Lambda, keeping it validated and agent-ready. Lambda is the AWS serverless compute service that runs code in response to events without provisioning servers. The 66-endpoint API covers function lifecycle, alias and version management, layers, event source mappings to SQS, Kinesis, and DynamoDB, function URLs, code signing configurations, concurrency controls, and synchronous and asynchronous invocations. It is the foundation of most event-driven AWS architectures and pairs with API Gateway, EventBridge, and S3 for end-to-end serverless applications.

Use Cases

Patterns agents use AWS Lambda API for, with concrete tasks.

★ Event-Driven Backend Processing

Process events from S3, SQS, EventBridge, DynamoDB Streams, and Kafka with serverless Lambda functions. The Lambda API creates functions with a chosen runtime, attaches event source mappings that handle batching and retries automatically, and exposes concurrency controls so a runaway producer cannot consume the account quota. Engineers ship business logic as a zip or container image without managing instances.

Create a function 'order-processor' with runtime python3.12 and an SQS event source mapping reading from queue arn:aws:sqs:us-east-1:123:orders

Blue/Green Deploys with Aliases

Roll out new function code safely by publishing immutable versions and shifting traffic via aliases. The Lambda API supports weighted aliases that split traffic between two versions, enabling canary and linear deployments without external orchestration. Combined with CodeDeploy, alias updates can pause and roll back automatically based on alarms.

Update alias 'live' on function order-processor to send 10 percent of traffic to version 7 and 90 percent to version 6

Function URLs for Direct HTTPS

Expose a Lambda function over HTTPS without standing up API Gateway. POST /2021-10-31/functions/{FunctionName}/url creates a dedicated URL with optional IAM auth, CORS, and an invoke mode for response streaming. This is the simplest path to a serverless HTTPS endpoint for webhooks, internal tools, or LLM agent backends.

Create a function URL on function 'webhook-receiver' with AWS_IAM auth and CORS allowing origin https://example.com

AI Agent Serverless Operations

AI agents call Lambda through Jentic to invoke business-logic functions on demand, deploy new functions when teams onboard new workflows, and adjust concurrency in response to alerts. Through Jentic, the agent searches by intent, loads the operation schema, and executes with credentials kept in the vault. SigV4 signing happens inside Jentic so the agent runtime stays simple.

Search Jentic for 'invoke lambda function', load the Invoke schema, and call function 'order-processor' with payload {"orderId": "abc"}

Key Endpoints

66 endpoints — jentic publishes the only available openapi specification for aws lambda, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

POST

/2015-03-31/functions

Create a Lambda function

GET

/2015-03-31/functions

List functions

POST

/2015-03-31/functions/{FunctionName}/aliases

Create an alias

POST

/2015-03-31/event-source-mappings/

Create an event source mapping

POST

/2021-10-31/functions/{FunctionName}/url

Create a function URL

POST

/2018-10-31/layers/{LayerName}/versions

Publish a new layer version

POST

/2015-03-31/functions

Create a Lambda function

GET

/2015-03-31/functions

List functions

POST

/2015-03-31/functions/{FunctionName}/aliases

Create an alias

POST

/2015-03-31/event-source-mappings/

Create an event source mapping

POST

/2021-10-31/functions/{FunctionName}/url

Create a function URL

Why though Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

AWS access keys for Lambda are stored encrypted in the Jentic vault. Jentic performs SigV4 signing at execution time, so raw AWS secrets never enter the agent's context.

Intent-based discovery

Agents search Jentic by intent such as 'invoke lambda function' or 'create lambda event source mapping' and Jentic returns the matching Lambda operation with its input schema, so the agent calls the right endpoint without parsing AWS docs.

Time to first call

Direct AWS Lambda integration: 2-4 days to set up SigV4 signing, IAM, and event source orchestration. Through Jentic: under 1 hour — search, load the schema, execute.

Related APIs

Alternatives and complements available in the Jentic catalogue.

Complementary

Amazon API Gateway v2

HTTP and WebSocket API gateway

Pair with Lambda when you need richer routing, request validation, or WebSocket APIs in front of functions

Complementary

Amazon EventBridge

Serverless event bus for AWS and SaaS sources

Use EventBridge to trigger Lambda functions from cross-service events without writing custom polling

Complementary

AWS Step Functions

Serverless workflow orchestration

Choose Step Functions when you need to coordinate multiple Lambda functions into a stateful workflow

Alternative

AWS Batch

Managed batch job execution on AWS compute

Pick Batch when workloads exceed Lambda's 15-minute or memory limits and benefit from queued batch scheduling

FAQs

Specific to using AWS Lambda API through Jentic.

Why is there no official OpenAPI spec for AWS Lambda?

AWS does not publish an OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call AWS Lambda via structured tooling. It is validated against the live API and kept up to date. Get started at https://app.jentic.com/sign-up.

What authentication does the AWS Lambda API use?

AWS Lambda uses AWS Signature Version 4 (SigV4) HMAC request signing scoped to the Lambda IAM service. Function URLs additionally support AWS_IAM or NONE authorization for direct HTTPS invocations. Through Jentic, AWS credentials live in the encrypted vault and SigV4 signing happens at execution time.

Can I invoke a Lambda function with the AWS Lambda API?

Yes. Use the Invoke endpoint at POST /2015-03-31/functions/{FunctionName}/invocations with InvocationType set to RequestResponse for synchronous calls, Event for fire-and-forget, or DryRun to validate permissions without executing.

How do I deploy a new Lambda function through Jentic?

Search Jentic for 'create lambda function', load the schema for POST /2015-03-31/functions, supply the runtime, role ARN, handler, and either a zip code reference or container image URI, then call the same operation with PUT semantics to update code in future. Jentic handles SigV4 signing throughout.

What are the rate limits for the AWS Lambda API?

Per-region quotas apply, including default concurrent execution limits, function and layer counts, and TPS limits on control plane operations. The Invoke API itself is bounded by reserved or provisioned concurrency on the function. Check the Lambda service quotas in the AWS console for current values.

Can I expose a Lambda function over HTTPS without API Gateway?

Yes. POST /2021-10-31/functions/{FunctionName}/url creates a dedicated function URL with optional IAM authorization, CORS configuration, and BUFFERED or RESPONSE_STREAM invoke mode for streaming responses.

Can I run a canary deployment with Lambda aliases?

Yes. Publish a new version with PublishVersion, then update an alias with a routing configuration that points a percentage of traffic to the new version. Combine with CloudWatch alarms and CodeDeploy for automated rollback.