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From agent-skills
Use when working with AI agent protocols, standards, and interoperability specifications. Covers MCP, A2A, ACP, Agent Skills, AGENTS.md, ADL, x402, AP2, MCP Apps, and cagent. USE FOR: agent protocol selection, comparing MCP vs A2A vs ACP, understanding agent standards ecosystem, choosing payment protocols DO NOT USE FOR: specific protocol implementation details (use the sub-skills: mcp, a2a, acp, x402, etc.)
npx claudepluginhub tyler-r-kendrick/agent-skills --plugin agent-skillsHow this skill is triggered — by the user, by Claude, or both
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/agent-skills:aiThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
This skill covers the emerging ecosystem of open standards and protocols for AI agents. These specifications define how agents discover capabilities, communicate with each other, make payments, render UI, and are described declaratively.
AGENTS.mdREADME.mda2a/AGENTS.mda2a/README.mda2a/metadata.jsona2a/rules/_sections.mda2a/rules/_template.mda2a/rules/a2a-combine-a2a-with-mcp.mda2a/rules/a2a-handle-the-input-required-status-to-support-interactive.mda2a/rules/a2a-implement-idempotency-on-task-ids-so-retries-don-t-create.mda2a/rules/a2a-publish-an-agent-card-with-accurate-skill-descriptions-so.mda2a/rules/a2a-use-streaming-tasks-sendsubscribe-for-long-running.mdacp/AGENTS.mdacp/README.mdacp/metadata.jsonacp/rules/_sections.mdacp/rules/_template.mdacp/rules/acp-attach-trajectorymetadata-to-parts-when-exposing.mdacp/rules/acp-since-acp-has-merged-into-a2a-evaluate-a2a-for-greenfield.mdacp/rules/acp-use-get-agents-for-runtime-discovery-so-clients-can.mdAgent-to-Agent (A2A) protocol implementation patterns for Google ADK - exposing agents via A2A, consuming external agents, multi-agent communication, and protocol configuration. Use when building multi-agent systems, implementing A2A protocol, exposing agents as services, consuming remote agents, configuring agent cards, or when user mentions A2A, agent-to-agent, multi-agent collaboration, remote agents, or agent orchestration.
Designs standards-compliant A2A Agent Cards (.well-known/agent.json) defining agent identity, skills with schemas, auth requirements, and capabilities for multi-agent discovery and orchestration.
Creates and configures A2A Agent Cards—JSON discovery documents detailing agent identity, capabilities, skills, authentication schemes, and endpoints for agent-to-agent delegation.
Share bugs, ideas, or general feedback.
This skill covers the emerging ecosystem of open standards and protocols for AI agents. These specifications define how agents discover capabilities, communicate with each other, make payments, render UI, and are described declaratively.
| Protocol | Purpose | Maintained By |
|---|---|---|
| MCP | Tool integration — how agents use tools and access context | Anthropic |
| A2A | Agent-to-agent communication and task delegation | |
| ACP | REST-based agent communication (merged into A2A) | IBM / BeeAI / Linux Foundation |
| Agent Skills | Skill packaging — how capabilities are discovered and loaded | Anthropic |
| AGENTS.md | Project-level guidance for coding agents | Community |
| ADL | Declarative agent definition (identity, tools, permissions) | Next Moca / Eclipse LMOS |
| x402 | HTTP-native micropayments using stablecoins | Coinbase |
| AP2 | Secure agent-driven commerce and purchases | |
| MCP Apps | Rich interactive UI served by MCP servers | Anthropic |
| cagent | Multi-agent runtime with YAML configuration | Docker |
┌─────────────────────────────────────────────┐
│ Agent Definition (ADL, AGENTS.md) │
│ "What the agent is and what it can do" │
├─────────────────────────────────────────────┤
│ Capability Discovery (Agent Skills, MCP) │
│ "How agents find and load tools/skills" │
├─────────────────────────────────────────────┤
│ Agent Communication (A2A, ACP) │
│ "How agents talk to each other" │
├─────────────────────────────────────────────┤
│ Payments (x402, AP2) │
│ "How agents pay for services" │
├─────────────────────────────────────────────┤
│ UI (MCP Apps) │
│ "How agents render interactive interfaces" │
├─────────────────────────────────────────────┤
│ Runtime (cagent) │
│ "How agents are orchestrated and executed" │
└─────────────────────────────────────────────┘