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Agent skill

Test Serverless Event Security

by cyberful in cyberful/cyberful

Test authorized serverless event handlers for source authority, signature and replay controls, tenant binding, schema validation, retry behavior, idempotency, and side-effect isolation using bounded…

AGPL-3.0Auto-check passedBackend & APIs

Install Test Serverless Event Security

skills CLI
$ npx skills add cyberful/cyberful --skill test-serverless-event-security -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install cyberful/cyberful test-serverless-event-security --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .claude/skills && cp -r skills-src/cyberful/builtin/skills/test-serverless-event-security .claude/skills/test-serverless-event-security && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
test-serverless-event-security
GitHub stars
135
Token cost
~548 tokens
SKILL.md length
160 words
Files
9 (incl. scripts, references, assets)
Skills in repo
85
Repo updated
First seen
Licence
AGPL-3.0

At a glance

Test authorized serverless event handlers for source authority, signature and replay controls, tenant binding, schema validation, retry behavior, idempotency, and side-effect isolation using bounded…

  • Tasks that involve Serverless
  • Runs Python scripts from its folder
  • Tasks that involve Forms and validation

What it does

Test Serverless Event Security is an agent skill from cyberful/cyberful. Test authorized serverless event handlers for source authority, signature and replay controls, tenant binding, schema validation, retry behavior, idempotency, and side-effect isolation using bounded synthetic events.

Its SKILL.md is about 550 tokens, which your agent loads only when the skill is triggered. The skill folder holds 13 other files, including scripts, reference files and assets (for example `agents/openai.yaml`, `assets/serverless-event-evidence.schema.json` and `assets/serverless-event-probe.example.json`).

It sits in Backend & APIs, covering Serverless and Forms and validation. The repository describes itself as: Cyberful is an open-source AI Red Team for discovering, exploiting, verifying, and remediating vulnerabilities. The licence is AGPL-3.0.

When your agent uses it

  • Tasks that involve Serverless
  • Tasks that involve Forms and validation

Example prompts

  • “/test-serverless-event-security”

Requirements

  • Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit ec598a6. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 2 files in scripts/ (Python), which the agent can run.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Test Serverless Event Security loads about 548 tokens when it runs, and up to ~768 if it reads all its reference files. Until then it costs about 62 tokens; SKILL.md has 160 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~62
When it runs · the whole SKILL.md, loaded when a task matches
~548
With references · SKILL.md plus every file in references/, read only if the agent opens them
~768

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from cyberful/cyberful at commit ec598a6, republished under its AGPL-3.0 licence (© cyberful). 160 words, ~548 tokens.

Download SKILL.mdSave it as .claude/skills/test-serverless-event-security/SKILL.md (or your agent's skills folder). This skill also uses 8 other files; get the full folder from GitHub.
name
test-serverless-event-security
description
Test authorized serverless event handlers for source authority, signature and replay controls, tenant binding, schema validation, retry behavior, idempotency, and side-effect isolation using bounded synthetic events.
metadata.domain
cloud-security
metadata.subdomain
serverless-event-security
metadata.triggers
test serverless event security, webhook function authorization, event source signature test, serverless replay assessment, function idempotency test
metadata.tags
serverless, events, webhooks, signatures, replay, idempotency

Test Serverless Event Security

Treat transport admission, event-source identity, signature canonicalization, schema, tenant context, retry, dead-letter routing, and downstream effect as independent boundaries. Use only synthetic events and reversible effects owned by the engagement.

Read serverless-event-method.md before varying signature, replay, or delivery metadata.

For bounded HTTP event probes in Pentest or Bug Bounty, stage scripts/run_serverless_event_probe.py, its manifest, and the example. The fixed-curl helper accepts attribution and defense-in-depth limits rather than authority, resolves CYBERFUL_SERVERLESS_AUTHORIZATION and CYBERFUL_SERVERLESS_SIGNATURE only after full preflight, and obtains non-loopback route and trust solely from Cyberful runtime environment. It is unavailable for Code Audit target traffic.

Confirm an event invariant

Run matched control/candidate events that differ in one source, tenant, timestamp, identifier, schema version, signature state, or retry condition. Preserve request digest, delivery metadata, function outcome, durable side effect, duplicate behavior, and cleanup. Broker or gateway acceptance alone is not proof of an application effect.

Route multi-consumer broker semantics to test-event-queue-boundaries and broad function configuration review to audit-serverless-security.

© cyberful, AGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 8 other files (scripts, references, assets) in cyberful/builtin/skills/test-serverless-event-security of cyberful/cyberful.

  • SKILL.md
  • agents/openai.yaml
  • assets/serverless-event-evidence.schema.json
  • assets/serverless-event-probe.example.json
  • assets/serverless-event-probe.schema.json
  • references/serverless-event-method.md
  • scripts/manifest.json
  • scripts/run_serverless_event_probe.py
  • tests/test_run_serverless_event_probe.py

Open the folder on GitHubat commit ec598a6

Compare with similar skills

Test Serverless Event Security next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Test Serverless Event Security compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Test Serverless Event Security this skillcyberful/cyberful135—~548Automated safety check: PassAGPL-3.0
Arcgis To Portaljsdatopian/portaljs2.4k1 repos~2kAutomated safety check: PassMIT
AWS Serverless Edazxkane/aws-skills3674 repos~3.2kAutomated safety check: PassMIT
Nestjs Trpctrycompai/crm11k—~2.8kAutomated safety check: PassMIT
Backend Dev Guidelineslangfuse/langfuse36k—~1.9kAutomated safety check: PassCustom licence
Livewire Developmentcoollabsio/coolify63k—~964Automated safety check: PassMIT

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Categories

Questions about Test Serverless Event Security

What does Test Serverless Event Security do?

Test authorized serverless event handlers for source authority, signature and replay controls, tenant binding, schema validation, retry behavior, idempotency, and side-effect isolation using bounded…. Test Serverless Event Security is an agent skill from cyberful/cyberful. Test authorized serverless event handlers for source authority, signature and replay controls, tenant binding, schema validation, retry behavior, idempotency, and side-effect isolation using bounded synthetic events.

When should I use Test Serverless Event Security?

Test Serverless Event Security fits situations like: tasks that involve Serverless; tasks that involve Forms and validation.

How do I install Test Serverless Event Security in Claude Code?

Run `npx skills add cyberful/cyberful --skill test-serverless-event-security -a claude-code`. Or copy the skill folder (cyberful/builtin/skills/test-serverless-event-security in cyberful/cyberful) into .claude/skills/test-serverless-event-security in your project. Claude Code loads it when a task matches its description.

How do I install Test Serverless Event Security in Codex?

Run `npx skills add cyberful/cyberful --skill test-serverless-event-security -a codex`. Or copy the skill folder (cyberful/builtin/skills/test-serverless-event-security in cyberful/cyberful) into .agents/skills/test-serverless-event-security in your project. Codex loads it when a task matches its description.

Can I use Test Serverless Event Security in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add cyberful/cyberful --skill test-serverless-event-security -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/test-serverless-event-security, .gemini/skills/test-serverless-event-security, .github/skills/test-serverless-event-security and .opencode/skills/test-serverless-event-security in your project.

What does Test Serverless Event Security need to run?

Going by SKILL.md and its folder, Test Serverless Event Security needs Python for the scripts in its folder. Our summary lists: Python 3.

Does Test Serverless Event Security access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Test Serverless Event Security safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Test Serverless Event Security use?

Test Serverless Event Security is published under the AGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Test Serverless Event Security use?

About 548 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 220 tokens, read only when the agent opens those files.

What are the alternatives to Test Serverless Event Security?

Skills that share tags, products or a category with Test Serverless Event Security: Arcgis To Portaljs (datopian/portaljs, 2.4k stars), AWS Serverless Eda (zxkane/aws-skills, 367 stars), Nestjs Trpc (trycompai/crm, 11k stars) and Backend Dev Guidelines (langfuse/langfuse, 36k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Test Serverless Event Security?

cyberful (a GitHub organization) maintains it in cyberful/cyberful, which has 135 GitHub stars. The repository holds 85 skills in this directory. The repository was last updated on August 24, 2026.

Source: cyberful/cyberful on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.