AWS Agent Skills is a collection of local instructions that help coding agents reason about AWS cloud services and engineering tasks. It supports agents working with areas such as identity, compute, storage, serverless, databases, networking, and security. The catalogue contains 18 service-focused skills and one plugin for using these capabilities with coding agents.
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.
npx skills add itsmostafa/aws-agent-skills --skill step-functionsgit clone --depth 1 https://github.com/itsmostafa/aws-agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/itsmostafa/aws-agent-skills/step-functions)<a href="https://agentmods.dev/skills/itsmostafa/aws-agent-skills/step-functions"><img src="https://agentmods.dev/badge/skills/itsmostafa/aws-agent-skills/step-functions.svg" alt="Measured on agentmods" height="20"></a>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 5.1 | $0.00035 | $0.02406 |
| Opus 5 | $0.00017 | $0.01203 |
| Sonnet 5 | $0.00007 | $0.00481 |
| Haiku 4.5 | $0.00003 | $0.00241 |
Grade A, and why
step-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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 405 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AWS Step Functions
AWS Step Functions is a serverless orchestration service that lets you build and run workflows using state machines. Coordinate multiple AWS services into business-critical applications.
Table of Contents
Core Concepts
Workflow Types
| Type | Description | Pricing |
|---|---|---|
| Standard | Long-running, durable, exactly-once | Per state transition |
| Express | High-volume, short-duration | Per execution (time + memory) |
State Types
| State | Description |
|---|---|
| Task | Execute work (Lambda, API call) |
| Choice | Conditional branching |
| Parallel | Execute branches concurrently |
| Map | Iterate over array |
| Wait | Delay execution |
| Pass | Pass input to output |
| Succeed | End successfully |
| Fail | End with failure |
Amazon States Language (ASL)
JSON-based language for defining state machines.
Common Patterns
Simple Lambda Workflow
{
"Comment": "Process order workflow",
"StartAt": "ValidateOrder",
"States": {
"ValidateOrder": {
"Type": "Task",
"Resource": "arn:aws:lambda:us-east-1:123456789012:function:ValidateOrder",
"Next": "ProcessPayment"
},
"ProcessPayment": {
"Type": "Task",
"Resource": "arn:aws:lambda:us-east-1:123456789012:function:ProcessPayment",
"Next": "FulfillOrder"
},
"FulfillOrder": {
"Type": "Task",
"Resource": "arn:aws:lambda:us-east-1:123456789012:function:FulfillOrder",
"End": true
}
}
}
Create State Machine
AWS CLI:
aws stepfunctions create-state-machine \
--name OrderWorkflow \
--definition file://workflow.json \
--role-arn arn:aws:iam::123456789012:role/StepFunctionsRole \
--type STANDARD
What ships with it
1 file 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.
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.
- 7d ago First seen · 405 lines · 35 tokens per session scan A e082dd00612e
step-functions is a skill published in the GitHub repository itsmostafa/aws-agent-skills (1,150 stars, last pushed 6d ago), licensed MIT. It adds 35 tokens to every session and 2,406 once invoked, about $0.0002 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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