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Craft interoperable, asynchronous agent-to-agent architectures.

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Type
Open Source
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About prompt

This prompt, part of the ai-boost/awesome-prompts collection, is crafted for architects designing multi-agent systems compliant with the A2A (Agent-to-Agent) protocol. It provides a structured blueprint for building interoperable, asynchronous, and opaque agent-to-agent communication. The prompt covers seven key design areas: agent identity and discovery via AgentCard, a complete task lifecycle state machine (submitted, working, input-required, auth-required, completed, failed, canceled, rejected), a layered message and content model (Message, Part, Artifact), multiple protocol bindings (JSON-RPC 2.0 over HTTP/SSE, gRPC, HTTP+JSON/REST), async execution patterns (streaming, push notifications, polling), security and trust boundaries (OAuth2, mTLS, OIDC), and context/versioning mechanisms. The prompt enforces design principles such as opacity by default, discovery first, async by default, binding independence, explicit failure handling, and idempotency.

Key Features

Agent identity and discovery via AgentCard and /.well-known/agent.json
Task lifecycle state machine with terminal states and idempotency contracts
Message and content model with Message, Part, and Artifact units
Protocol binding support for JSON-RPC 2.0 over HTTP/SSE, gRPC, and HTTP+JSON/REST
Async execution patterns including streaming, push notifications, polling, and non-blocking delegation
Security and trust boundaries with OAuth2, API keys, mTLS, and OIDC
Context and versioning via contextId, taskId, A2A-Version negotiation, and URI-identified extensions

Pros & Cons

Pros
  • Enforces opacity by default, keeping agent internals hidden from peers
  • Discovery-first approach ensures clients understand capabilities before delegating work
  • Async-by-default design suits both short-lived and long-running tasks
  • Binding independence allows same core semantics across JSON-RPC, gRPC, and REST
  • Explicit failure handling with structured error codes improves reliability
  • Idempotency where specified (CancelTask, optional SendMessage) supports robust systems
Cons
  • Designed specifically for A2A protocol, limiting applicability to other agent communication standards
  • Requires significant domain knowledge and implementation effort to apply the prompt effectively
  • Not a ready-to-use tool; provides a framework that must be adapted to specific projects

Best For

Designing interoperable multi-agent systems that adhere to the A2A protocolStandardizing agent communication in heterogeneous environmentsBuilding secure, asynchronous agent workflows with rich task managementDefining agent capabilities and discovery mechanisms for enterprise integrations

FAQ

What is the A2A Protocol?
A2A (Agent-to-Agent) is an open protocol for enabling interoperable communication between autonomous agents, with a specification available at a2a-protocol.org and an open-source project on GitHub.
What does this prompt help me design?
It helps you design all aspects of an A2A-compliant multi-agent system, including agent identity, task lifecycles, message formats, protocol bindings, async execution, security, and versioning.
Can I use this prompt with any AI model?
Yes, as a text-based prompt, it can be used with any large language model that follows instructions, though it is most effective with models strong at technical architecture design.