What is aws-lambda-durable-functions?

A guide to building long-running, multi-step applications with AWS Lambda durable functions. These functions save their progress, retry failed steps, and coordinate work that may be interrupted or run for a long time.

Use it to build TypeScript, JavaScript, or Python workflows; add retries and state persistence; handle waits and callbacks; use saga-style error recovery; test; and deploy with AWS tools.

It helps applications continue reliably through failures, pauses, callbacks, and interruptions instead of losing their progress.

aws-lambda-durable-functions — Skill by awslabs

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/awslabs/agent-plugins/aws-lambda-durable-functions

Any agent

npx skills add awslabs/agent-plugins --skill aws-lambda-durable-functions

Clone the repo

git clone --depth 1 https://github.com/awslabs/agent-plugins

Made for: Claude Code, Codex.

Per session 109 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,062 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00109	$0.02062
Opus 5	$0.00055	$0.01031
Sonnet 5	$0.00022	$0.00412
Haiku 4.5	$0.00011	$0.00206

Measured 2d ago against content hash 30b5352bc7ca, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

aws-lambda-durable-functions scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/aws-serverless/skills/aws-lambda-durable-functions/SKILL.md · 205 lines

How it starts

The opening of the file, as written. The whole thing — 205 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AWS Lambda durable functions

Build resilient multi-step applications and AI workflows that can execute for up to 1 year while maintaining reliable progress despite interruptions.

Onboarding

Step 1: Validate Prerequisites

Before using AWS Lambda durable functions, verify:

AWS CLI is installed (2.33.22 or higher) and configured:
```
aws --version
aws sts get-caller-identity
```
Runtime environment is ready:
- For TypeScript/JavaScript: Node.js 22+ (node --version)
- For Python: Python 3.11+ (python --version. Note that currently only Lambda runtime environments 3.13+ come with the Durable Execution SDK pre-installed. 3.11 is the min supported Python version by the Durable SDK itself, however, you could use OCI to bring your own container image with your own Python runtime + Durable SDK.)
Deployment capability exists (one of):
- AWS SAM CLI (sam --version) 1.153.1 or higher
- AWS CDK (cdk --version) v2.237.1 or higher
- Direct Lambda deployment access

Step 2: Select language and IaC framework

Language Selection

Default: TypeScript

Override syntax:

"use Python" → Generate Python code
"use JavaScript" → Generate JavaScript code

When not specified, ALWAYS use TypeScript

IaC framework selection

Default: CDK

Override syntax:

"use CloudFormation" → Generate YAML templates
"use SAM" → Generate YAML templates

When not specified, ALWAYS use CDK

Error Scenarios

Unsupported Language

List detected language
State: "Durable Execution SDK is not yet available for [framework]"
Suggest supported languages as alternatives

Unsupported IaC Framework

List detected framework
State: "[framework] might not support Lambda durable functions yet"
Suggest supported frameworks as alternatives

Serverless MCP Server Unavailable

Inform user: "AWS Serverless MCP not responding"
Ask: "Proceed without MCP support?"
DO NOT continue without user confirmation

Read the full file on GitHub · 205 lines

Files

What ships with it

11 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 205 lines · 109 tokens per session scan A 30b5352bc7ca

Subscribe to this mod's changes

aws-lambda-durable-functions is a skill published in the GitHub repository awslabs/agent-plugins (876 stars, last pushed 5d ago), licensed Apache-2.0. It adds 109 tokens to every session and 2,062 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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