agent-protocols

agent-protocols is a skill for Claude Code, Codex from insodimension/awesome-agent-protocols. It costs 163 tokens per session (3,244 once invoked), scanned A, original, CC0-1.0.

A guide for choosing established standards that let AI agents, applications, and services communicate, such as MCP, A2A, ACP, and related protocols.

In plain words
What is it for?
Analyzing an agent system, selecting a suitable protocol, reviewing its specification and message examples, checking compliance, and finding ways to contribute.
Why use it?
It helps developers avoid designing incompatible communication rules from scratch and checks whether an implementation follows the chosen standard.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Analyzing an agent system, selecting a suitable protocol, reviewing its specification and message examples, checking compliance, and finding ways to contribute.

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Install with agentmods
npx agentmods add skills/insodimension/awesome-agent-protocols/agent-protocols
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 insodimension/awesome-agent-protocols --skill agent-protocols
Clone the repo
git clone --depth 1 https://github.com/insodimension/awesome-agent-protocols

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 agent-protocols

README.md
[![agentmods](https://agentmods.dev/badge/skills/insodimension/awesome-agent-protocols/agent-protocols.svg)](https://agentmods.dev/skills/insodimension/awesome-agent-protocols/agent-protocols)
Your own site
<a href="https://agentmods.dev/skills/insodimension/awesome-agent-protocols/agent-protocols"><img src="https://agentmods.dev/badge/skills/insodimension/awesome-agent-protocols/agent-protocols.svg" alt="Measured on agentmods" height="20"></a>
Per session 163 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,244 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 $0.00163 $0.03244
Opus 5 $0.00081 $0.01622
Sonnet 5 $0.00033 $0.00649
Haiku 4.5 $0.00016 $0.00324

Measured 7d ago against content hash 849055cf73f5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

agent-protocols 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 7d 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.

skills/agent-protocols/SKILL.md · 193 lines

How it starts

The opening of the file, as written. The whole thing — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Protocols

Guides agent/harness engineering toward using, extending, and contributing to established AI agent protocol standards rather than inventing ad-hoc solutions.

Knowledge base: This skill lives inside the awesome-agent-protocols repo, which catalogs 53+ protocols across 11 stack layers. The catalog is the source of truth; this skill makes it actionable during development.

This skill is self-improving. Every run must end with a gotcha review (see Self-Improvement Protocol).

This skill is a checklist, not a suggestion. Every mode below is a numbered checklist. You MUST tick each [ ] by writing its status + exit-criterion outcome in your response BEFORE moving to the next step. Skipping a step without documenting why is a skill violation.


Pre-flight — ALWAYS (before any mode)

  • PF-1. Read references/gotchas.md. Exit: you can state the 3 most recent dated entries in one sentence each (or confirm the log is empty).
  • PF-2. Read the protocol catalog. Read the repo's README.md (two levels up from this skill) to load the current protocol taxonomy. Exit: you can name the 11 stack layers.
  • PF-3. Read the decision tree. Read references/decision-tree.md. Exit: you can map the 10 primary "you're building..." rows to their protocols.
  • PF-4. Understand the user's context. What are they building? What layer of the stack? What's the integration target? Exit: one sentence stating the task and its stack layer.
  • PF-5. Pick the mode. Exit: one of Recommend / Lookup / Audit / Contribute written down.

Modes

Mode When to use Output
Recommend User is building something and needs to know which protocol(s) apply Protocol recommendation with rationale + wire examples
Lookup User wants spec details, wire messages, or examples for a specific protocol Spec summary + verbatim wire examples from examples/
Audit User has existing code and wants to check protocol compliance or find protocol opportunities Compliance report + specific recommendations
Contribute User built something protocol-adjacent and wants to contribute back Contribution path: which spec, which repo, what format

Read the full file on GitHub · 193 lines

Files

What ships with it

3 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. 7d ago First seen · 193 lines · 163 tokens per session scan A 849055cf73f5

Subscribe to this mod's changes

agent-protocols is a skill published in the GitHub repository insodimension/awesome-agent-protocols (9 stars, last pushed 3mo ago), licensed CC0-1.0. It adds 163 tokens to every session and 3,244 once invoked, about $0.0008 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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