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What is the A2A Protocol

The Agent-to-Agent (A2A) protocol is an open standard that enables secure, framework-agnostic communication between autonomous AI agents. Instead of building bespoke integrations whenever you want agents to collaborate, A2A gives Corti-Agentic and other systems a common language agents can use to discover, talk to, and delegate work to one another. For the full technical specification, see the official A2A project docs at a2a-protocol.org.
The v1 API implements A2A protocol version 0.3, not the latest (v1.0) specification. The link above shows the latest spec, which includes features not available in the v0.3 implementation. For the v0.3-specific behavior, refer to the v1 API reference and the migration guide’s A2A v0.3 to v1.0 section.
Originally developed by Google and now stewarded under the Linux Foundation, A2A solves a core problem in multi-agent systems: interoperability across ecosystems, languages, and vendors. It lets you connect agents built in Python, JavaScript, Java, Go, .NET, or other languages and have them cooperate on complex workflows without exposing internal agent state or proprietary logic.

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Why Corti-Agentic Uses A2A

We chose A2A because it:
  • Standardizes agent communication. Agents can talk to each other without siloed, point-to-point integrations. That makes composite workflows easier to build and maintain.
  • Supports real workflows. A2A includes discovery, task negotiation, and streaming updates, so agents can coordinate long-running or multi-step jobs.
  • Preserves security and opacity. Agents exchange structured messages without sharing internal memory or tools. That protects intellectual property and keeps interactions predictable.
  • Leverages open tooling. There are open source SDKs in multiple languages and example implementations you can reuse.
In Corti-Agentic, A2A is the backbone for agent collaboration. Whether you’re orchestrating specialist agents, chaining reasoning tasks, or integrating external agent services, A2A gives you a robust, open foundation you don’t have to reinvent.

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V1 API Bindings

The v1 API exposes two A2A v0.3 bindings: Both bindings share the same underlying handler—the REST endpoints are a convenience wrapper around the same logic as the JSON-RPC binding.
The v1 agent card advertises streaming: true in its capabilities, but the v1 API surface does not provide a streaming endpoint. Streaming (message:stream and tasks:subscribe SSE endpoints) is only available in the v2 API. Use polling via GET /agents/{id}/v1/tasks/{taskId} to track task progress in v1.

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Open Source SDKs and Tooling

For links to Corti’s official SDK and the official A2A project SDKs (Python, JavaScript/TypeScript, Java, Go, and .NET), see SDKs & Integrations.
Please contact us if you need more information about the Corti Agentic Framework.