a2a-security-review

a2a-security-review is a skill for Claude Code from jassics/awesome-claude-security. It costs 83 tokens per session (1,026 once invoked), scanned A, original, GPL-3.0.

A security review of trust between AI agents in an agent-to-agent or multi-agent system, where one agent delegates work to another.

In plain words
What is it for?
Checking agent identity, message integrity, capability negotiation, and whether delegated permissions become narrower at each step.
Why use it?
It helps prevent fake peers, altered messages, untrusted capabilities, and delegation chains that grant too much access.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the agentic-ai-security plugin — 6 skills shipped together

Good fit Checking agent identity, message integrity, capability negotiation, and whether delegated permissions become narrower at each step.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jassics/awesome-claude-security/a2a-security-review
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 jassics/awesome-claude-security --skill a2a-security-review
Clone the repo
git clone --depth 1 https://github.com/jassics/awesome-claude-security

Made for: Claude Code.

Or install agentic-ai-security, the plugin that ships this one along with the rest of its 6 skills.

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 a2a-security-review

README.md
[![agentmods](https://agentmods.dev/badge/skills/jassics/awesome-claude-security/a2a-security-review/github.svg)](https://agentmods.dev/skills/jassics/awesome-claude-security/a2a-security-review)
Your own site
<a href="https://agentmods.dev/skills/jassics/awesome-claude-security/a2a-security-review"><img src="https://agentmods.dev/badge/skills/jassics/awesome-claude-security/a2a-security-review/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 a2a-security-review

Your own site · 80×15
<a href="https://agentmods.dev/skills/jassics/awesome-claude-security/a2a-security-review"><img src="https://agentmods.dev/badge/skills/jassics/awesome-claude-security/a2a-security-review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 83 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,026 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 unknown 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 $0.00083 $0.01026
Opus 5 $0.00042 $0.00513
Sonnet 5 $0.00017 $0.00205
Haiku 4.5 $0.00008 $0.00103

Measured 10d ago against content hash 50f8ae199492, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

a2a-security-review 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.

plugins/agentic-ai-security/skills/a2a-security-review/SKILL.md · 90 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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 · 90 lines · 83 tokens per session scan A 50f8ae199492

Subscribe to this mod's changes

a2a-security-review is a skill published in the GitHub repository jassics/awesome-claude-security (6 stars, last pushed 1mo ago), licensed GPL-3.0. It adds 83 tokens to every session and 1,026 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 2026-08-31.

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