Agent Toolkit for AWS is a collection of AWS-supported MCP servers, skills, plugins, commands, and hooks that help AI coding agents build, deploy, and manage applications on AWS. It is used by developers working with AWS services through agents such as Claude Code, Codex, Cursor, and Kiro. The catalogue entries are the toolkit's own agent extensions for AWS development and operations.
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 aws/agent-toolkit-for-aws --skill securing-s3-bucketsgit clone --depth 1 https://github.com/aws/agent-toolkit-for-awsWrote 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/aws/agent-toolkit-for-aws/securing-s3-buckets)<a href="https://agentmods.dev/skills/aws/agent-toolkit-for-aws/securing-s3-buckets"><img src="https://agentmods.dev/badge/skills/aws/agent-toolkit-for-aws/securing-s3-buckets/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/aws/agent-toolkit-for-aws/securing-s3-buckets"><img src="https://agentmods.dev/badge/skills/aws/agent-toolkit-for-aws/securing-s3-buckets.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00084 | $0.01810 |
| Opus 5 | $0.00042 | $0.00905 |
| Sonnet 5 | $0.00017 | $0.00362 |
| Haiku 4.5 | $0.00008 | $0.00181 |
Grade A, and why
securing-s3-buckets 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 6d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- securing-s3-buckets — 95% identical, 21 lines differ
How it starts
The opening of the file, as written. The whole thing — 159 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Overview
Implements layered S3 security controls across five workflows: securing new buckets, auditing existing configurations, remediating findings, configuring encryption, and enabling monitoring. Follows AWS Well-Architected security best practices.
Execute commands using the AWS MCP server when connected (sandboxed execution, audit logging, observability). Fall back to AWS CLI or shell otherwise.
Common Tasks
0. Verify Dependencies
Check for required tools before starting.
Constraints:
- You MUST inform the user if required tools are missing
- You SHOULD confirm credentials with
aws sts get-caller-identity
See references/iam-permissions.md for IAM permissions by workflow.
1. Classify the Request
| User intent | Workflow |
|---|---|
| Secure a new bucket | A: Secure New Bucket |
| Audit / review existing bucket | B: Audit Existing Bucket |
| Fix a specific finding | C: Remediate Issue |
| Configure encryption | D: Configure Encryption |
| Enable logging / monitoring | E: Enable Monitoring |
Constraints:
- You MUST ask for all required parameters upfront
- You MUST confirm bucket name and region before any write operation
- You MAY infer region from user context if clearly stated
- You SHOULD run
aws iam simulate-principal-policyto validate permissions before write operations - You SHOULD display write commands and wait for confirmation before executing
put-bucket-policy Safety Rules
These rules apply to ALL workflows that call put-bucket-policy:
- You MUST attempt to retrieve the existing policy first (
aws s3api get-bucket-policy) —put-bucket-policyreplaces the entire policy - If a policy exists, you MUST back it up before modifying:
aws s3api get-bucket-policy --bucket <name> --output text > backup-policy-$(date +%s).json - If
NoSuchBucketPolicyis returned, proceed with a new policy — no backup is needed - You MUST merge new statements into the existing policy's Statement array (if one exists)
- You MUST validate merged JSON syntax before applying (e.g.
echo '<policy>' | python3 -m json.tool) - You SHOULD display the full
put-bucket-policycommand and wait for confirmation
What ships with it
5 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.
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.
- 6d ago First seen · 159 lines · 84 tokens per session scan A 79a304b00d95
securing-s3-buckets is a skill published in the GitHub repository aws/agent-toolkit-for-aws (2,569 stars, last pushed yesterday), licensed Apache-2.0. It adds 84 tokens to every session and 1,810 once invoked, about $0.0004 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 2026-09-03.
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