Agent Plugins Specification 1.0.0 Released

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The Agent Plugins Specification 1.0.0 establishes a normative standard for portable plugin packages that extend AI agent runtimes with modular components.

Key points

  1. Version 1.0.0 sets normative requirements for package layouts, manifests, and client runtimes.
  2. A plugin is defined as a self-contained directory requiring a root-level plugin.json manifest.
  3. Strict path containment rules prohibit escaping the plugin root; relative paths must start with ./ and resolve internally.
  4. The manifest uses a closed schema with mandatory $schema and name fields, alongside standard metadata attributes.
  5. Clients must report and ignore unknown top-level fields, while client-specific data belongs in an extensions object using reverse-domain namespaces.
  6. The layout accommodates standard components like skills/ (via SKILL.md) and MCP server definitions via mcp.json.

Why it matters

This specification provides an interoperable, vendor-neutral packaging format for AI agent architectures. It allows developers to distribute skills and MCP tool integrations across diverse client runtimes without custom adapters.

Analysis

The specification leans heavily on established packaging best practices, leveraging JSON Schema validation and strict RFC 2119 conformance. The explicit path-containment mechanisms address filesystem traversal security risks inherent in distributing third-party code. By providing isolated reverse-domain extension mechanisms alongside standard component folders, the standard balances cross-platform compatibility with client-specific functionality.

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Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

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