Sample Agent Skills for Builders is a collection of reusable skills that extend AI coding agents with AWS, CDK, security, testing, and engineering workflows. Developers can install the skills for practical AWS development tasks or use the repository as a model for creating their own agent skills. The catalogue entries are skills and instructions from this collection.
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-samples/sample-agent-skills-for-builders --skill api-gateway-authorizer-securitygit clone --depth 1 https://github.com/aws-samples/sample-agent-skills-for-buildersWrote 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-samples/sample-agent-skills-for-builders/api-gateway-authorizer-security)<a href="https://agentmods.dev/skills/aws-samples/sample-agent-skills-for-builders/api-gateway-authorizer-security"><img src="https://agentmods.dev/badge/skills/aws-samples/sample-agent-skills-for-builders/api-gateway-authorizer-security.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 50 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 117 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00051 | $0.01644 |
| Opus 5 | $0.00026 | $0.00822 |
| Sonnet 5 | $0.00010 | $0.00329 |
| Haiku 4.5 | $0.00005 | $0.00164 |
Grade A, and why
api-gateway-authorizer-security 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 8d 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 — 159 lines — stays where its author put it; the contents beside it link to each section on GitHub.
API Gateway Authorizer Security
Review and remediate API Gateway authorization findings without adding security theater merely to make a scanner pass.
Authorizer Precedence Rule
Apply exactly one effective authorizer policy to each route:
- If the route requires Cognito, OIDC JWT, IAM, or custom business authorization, use that real authorizer only.
- If the route is intentionally public and organizational scanning policy requires an authorizer, an always-allow Lambda authorizer may be used only as the documented fallback.
- Never replace, wrap, or supplement a real business authorizer with the fallback authorizer.
The fallback authorizer is a scanner-compatibility control, not authentication. Its name, documentation, route inventory, and review output must state that it grants public access.
When to Apply
Use this skill when:
- A scanner flags an API Gateway route with no authorizer
cdk-nagreportsAwsSolutions-APIG4or a similar authorization finding- A dedicated fallback Lambda authorizer is needed for intentionally public routes
- Public health, sign-in, OAuth callback, or webhook routes need a defensible exception
- API Gateway authorization is being designed or reviewed
Workflow
1. Inventory Effective Route Authorization
Inspect both infrastructure source and the synthesized CloudFormation template. For every route or method, record:
| Route | Method | Exposure | Configured authorizer | Actual security check | Classification |
|---|---|---|---|---|---|
/example |
GET |
Public internet | JWT, IAM, Lambda, or none | What is validated | Protected or intentionally public |
Do not infer protection from an authorizer attachment alone. Read the authorizer handler and its configuration.
Useful searches:
rg -n "addRoutes|addMethod|authorizer|authorizationType|isAuthorized|Effect.*Allow" .
npx cdk synth
rg -n "AuthorizationType|AuthorizerId|AuthorizerUri|IdentitySource" cdk.out
2. Identify and Classify Pass-Through Authorizers
What ships with it
2 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.
- 8d ago First seen · 159 lines · 51 tokens per session scan A 68c9a519976f
api-gateway-authorizer-security is a skill published in the GitHub repository aws-samples/sample-agent-skills-for-builders (47 stars, last pushed 12d ago), licensed Apache-2.0. It adds 51 tokens to every session and 1,644 once invoked, about $0.0003 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.
Other skills, from other repositories
mem0-oss-to-platform
Plan and then execute a migration of a project from the mem0 open-source / self-hosted SDK (the local Memory class) to the mem0 Platform / hosted / managed SDK (the MemoryClient class). Use this whenever a developer wants to move, switch, or migrate their mem0 usage off OSS/self-hosted to the hosted API — e.g.…
agui-dotnet-protobuf
Use the protobuf wire transport (instead of the default Server-Sent Events) for an AG-UI connection with the AG-UI .NET SDK — a compact binary event stream negotiated via the Accept header. USE FOR: making an AGUIChatClient prefer protobuf by wiring an AGUIEventStreamHandler with ProtobufEventStreamFormatter (then…
azure-mgmt-botservice-dotnet
Azure Resource Manager SDK for Bot Service in .NET. Management plane operations for creating and managing Azure Bot resources, channels (Teams, DirectLine, Slack), and connection settings. Triggers: "Bot Service", "BotResource", "Azure Bot", "DirectLine channel", "Teams channel", "bot management .NET", "create bot".
fastapi-router-py
Create FastAPI routers with CRUD operations, authentication dependencies, and proper response models. Use when building REST API endpoints, creating new routes, implementing CRUD operations, or adding authenticated endpoints in FastAPI applications.
migrate-segw-to-rap
Reverse-engineer a SEGW-built OData V2 service (MPC/DPC/MPCEXT/DPCEXT) into a modern RAP V4 service — tables, CDS views (interface + projection), behavior definitions, draft entities, service definition + binding. Use when asked to "migrate this SEGW service to RAP", "convert OData V2 to V4 RAP", "modernize this…
telnyx-messaging-hosted-curl
Set up hosted SMS numbers, toll-free verification, and RCS messaging. Use when migrating numbers or enabling rich messaging features. This skill provides REST API (curl) examples.