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Protocols
Protocols
Protocols and standards for communication, tool use and governance.
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2025
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Sep 29, 2025
Agentic Commerce Protocol
An open standard released by OpenAI with Stripe in September 2025 that lets AI agents, people and businesses complete purchases together, and the basis of Instant Checkout in ChatGPT.
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Sep 17, 2025
Agent Payments Protocol (AP2)
An open protocol announced by Google on 17 September 2025 for securely initiating and settling payments carried out by AI agents across platforms, using signed Mandates as verifiable proof of a user's instructions.
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2025
Agent2Agent Protocol
Google's 2025 open protocol for discovery, communication, and collaboration across agents from different vendors or frameworks.
2023
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Nov 6, 2023
GPT Actions
GPT Actions let a custom GPT call external APIs, turning a user's request into the JSON input an API needs. Introduced by OpenAI on 6 November 2023, they grew out of the plugins beta and rely on OpenAPI schemas plus authentication settings.
2004
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Feb 10, 2004
OWL Web Ontology Language
OWL is a W3C Recommendation published on 10 February 2004: a semantic markup language for publishing and sharing ontologies on the Web, giving software formal definitions of terms so it can process the meaning of information, not just display it.
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Open Agent Schema Framework (OASF)
OASF is a standardized, extensible schema system from the AGNTCY project for describing AI agent attributes, skills and capabilities in machine-readable records, so that agents can discover and understand each other across protocols.