iac-serverless

iac-serverless is a skill for Claude Code, Codex from senaykt/iac-security-scan-skills. It costs 51 tokens per session (10,575 once invoked), scanned A, original, MIT.

A security review guide for AWS serverless infrastructure, where services such as Lambda run code without managing servers directly.

In plain words
What is it for?
Use it to review AWS infrastructure for Lambda, API Gateway, queues, notifications, workflows, AppSync, CloudFront, and related serverless services.
Why use it?
It finds attack chains involving exposed functions, excessive permissions, event injection, privilege escalation, persistence, and unexpected costs.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

Good fit Use it to review AWS infrastructure for Lambda, API Gateway, queues, notifications, workflows, AppSync, CloudFront, and related serverless services.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/senaykt/iac-security-scan-skills/iac-serverless
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.

Any agent
npx skills add senaykt/iac-security-scan-skills --skill iac-serverless
Clone the repo
git clone --depth 1 https://github.com/senaykt/iac-security-scan-skills

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for iac-serverless

README.md
[![agentmods](https://agentmods.dev/badge/skills/senaykt/iac-security-scan-skills/iac-serverless/github.svg)](https://agentmods.dev/skills/senaykt/iac-security-scan-skills/iac-serverless)
Your own site
<a href="https://agentmods.dev/skills/senaykt/iac-security-scan-skills/iac-serverless"><img src="https://agentmods.dev/badge/skills/senaykt/iac-security-scan-skills/iac-serverless/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.

agentmods 80×15 button for iac-serverless

Your own site · 80×15
<a href="https://agentmods.dev/skills/senaykt/iac-security-scan-skills/iac-serverless"><img src="https://agentmods.dev/badge/skills/senaykt/iac-security-scan-skills/iac-serverless.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 10,575 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00051 $0.10575
Opus 5 $0.00026 $0.05287
Sonnet 5 $0.00010 $0.02115
Haiku 4.5 $0.00005 $0.01057

Measured 10d ago against content hash 43a7898550e1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

iac-serverless 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 10d 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.

.agents/skills/iac-serverless/SKILL.md · 638 lines

How it starts

The opening of the file, as written. The whole thing — 638 lines — stays where its author put it; the contents beside it link to each section on GitHub.

iac-serverless

You are a serverless security reviewer. You reason about invoke paths, trust chains, privilege propagation, blast radius, and event-driven attack surfaces — not isolated API misconfigurations. You think in attack chains: "If I can invoke this Lambda, what role do I become? Where can that role go? Can I inject events? Can I persist?"

OBJECTIVE

Produce attack-path-aware serverless security findings: which workloads can an attacker invoke, what can those functions do, what event chains do they participate in, where does privilege escalate through orchestration, and how could an attacker persist, exfiltrate, or financially devastate the account through the serverless control plane.

SCOPE

File routing: This skill receives only IaC files containing serverless resources (Lambda, API Gateway, SQS, SNS, Step Functions, AppSync, CloudFront, etc.), as determined by the File Routing table in iac-scan/analysis.md. Shared context files (variables.tf, providers.tf, etc.) are also included.

In scope

All IaC-defined serverless constructs: Lambda (functions, Function URLs, permissions, layers, event source mappings), API Gateway (REST v1, HTTP v2, WebSocket — routes, authorizers, stages, WAF), EventBridge (buses, rules, archives, pipes), SQS, SNS, Step Functions, AppSync, CloudFront integrations (Lambda@Edge, CloudFront Functions), and their CloudFormation/SAM/Serverless Framework equivalents.

Cross-resource composition (API → Lambda → data store, event chains), invoke permissions, event source mappings, Lambda execution roles (from iac-iam), Lambda networking (VPC, egress), environment variable secrets (from iac-secrets), and Lambda layers.

Out of scope (delegated)

  • Deep IAM trust / privilege escalation primitives (iac-iam) — this skill consumes iac-iam output and adds serverless-specific context.
  • Network reachability composition (iac-network) — this skill consumes iac-network output.
  • Secrets in environment variables (iac-secrets) — this skill consumes iac-secrets output.
  • Data-store encryption / data classification (iac-storage) — this skill consumes iac-storage output.
  • Missing logging / monitoring (iac-logging-monitoring) — this skill consumes its output for correlation.
  • Application-layer code vulnerabilities inside Lambda handlers (SAST domain).
  • Runtime Lambda behavior (cold start profiling, memory analysis).
  • WAF rule quality (iac-waf if it exists) — this skill flags WAF presence/absence on APIs.
  • General IAM misconfiguration outside serverless workloads (iac-iam).

Read the full file on GitHub · 638 lines

Files

What ships with it

4 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.

  1. 10d ago First seen · 638 lines · 51 tokens per session scan A 43a7898550e1

Subscribe to this mod's changes

iac-serverless is a skill published in the GitHub repository senaykt/iac-security-scan-skills (48 stars, last pushed 3mo ago), licensed MIT. It adds 51 tokens to every session and 10,575 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.

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