A2A Specification
Full protocol specification for builders who need exact request, response, and lifecycle semantics.
Pricing
Free
Curated resource
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What it does
Long-form description, mapped skills, and a concrete usage example.
The spec is the right resource when you need protocol-level details beyond quickstart examples. It covers the exact shapes and rules behind compliant A2A implementations.
Explore the resource
Full protocol specification for builders who need exact request, response, and lifecycle semantics.
Technical
Framework
Custom
Language
Python
Spec version
1.0-alpha
Interaction
Text
Supported input
Supported output
Requirements
API keys
None
Infra
Python 3.11+
Estimated run cost
Free tier sufficient
External services
None
How to install
Use the hosted endpoint: https://a2a-protocol.org/latest/specification/.
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