What happened
Amazon, Cursor, Microsoft, OpenAI, and Vercel have created Agent Plugins, an open standard that defines a single package format for AI agent extensions. The standard uses a directory with a manifest file called plugin.json and supports two components: Agent Skills (reusable instructions and workflows) and MCP servers (connections to tools and data).
Why it matters
Until now, each product used its own formats and setup processes, forcing developers to rebuild extensions for every platform. A shared standard lets developers bundle and reuse their work across multiple platforms, removing friction for extension creators.
What to watch
The spec is being developed openly on GitHub and currently covers only packaging and discoverability—it does not yet address marketplaces, permissions, or runtime environments. Notably, Anthropic, which created the Model Context Protocol and Agent Skills standards, is not part of the effort despite having added its own plugin system to its Cowork tool.
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The Agent Plugins initiative addresses a real friction point in the emerging AI agent ecosystem: the fragmentation of extension formats across competing platforms. Each vendor—Amazon, Microsoft, OpenAI, Vercel, and Cursor—has built or is building agent tooling, yet they had no way for developers to write once and deploy everywhere. By agreeing on a shared manifest structure and package format, these five companies are making a bet that reducing developer burden will accelerate ecosystem growth.
The standard is deliberately narrow: it specifies only how to package and discover plugins, deferring harder questions like permissions, marketplaces, and runtime behavior to a later phase or to individual platforms. This pragmatic scoping increases the chances of adoption while leaving room for platforms to differentiate on commercial and security features.
One striking absence is Anthropic, which created both the Model Context Protocol (MCP) and Agent Skills as open standards and recently launched its own agentic tool, Cowork. Despite Anthropic's foundational role in these standards, it did not join the coalition. This gap may reflect either independent strategy or unresolved technical or commercial alignment questions.
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