Plugin Manifest

The foundational section that uniquely identifies the plugin and provides human-readable information.

• name: A unique, machine-readable identifier (e.g., company.awesome-tool).
• version: A version string, ideally following Semantic Versioning (SemVer) (e.g., 1.2.3).
• displayName: A human-friendly name for UI presentation.
• description: A concise summary of the plugin's purpose and functionality.
• author: The individual or organization responsible for the plugin.
• license: The software license under which the plugin is distributed (e.g., MIT, Apache-2.0).

The core of the manifest, detailing the specific functionalities the plugin provides to the host system.

• tools or extensions: An array defining executable functions or integration points.
• Each tool includes:
  • name: The function's identifier.
  • description: What the tool does, used by the AI for tool discovery.
  • parameters: A schema (often JSON Schema) defining required and optional inputs.
  • returns: A schema defining the expected output structure.
• This section forms the API contract that the host's orchestration layer uses to validate and route requests.

Defines how the plugin can be customized by an end-user or administrator at runtime.

• configurationSchema: A schema (e.g., JSON Schema) that describes valid configuration options.
• This allows the host system to generate configuration UIs and validate settings before plugin initialization.
• Example properties include API endpoints, feature toggles, or connection timeouts.
• This enables dependency injection (DI) of settings by the host, adhering to the Inversion of Control (IoC) principle.

Specifies the environment and other components the plugin needs to function correctly.

• hostVersion: The minimum (or compatible) version of the host application or framework.
• dependencies: A list of other plugins or libraries this plugin requires.
• capabilities: A declaration of system-level permissions or features needed (e.g., network_access, file_system_write), forming part of a capability model for security.
• The host uses this to build a plugin dependency graph for correct loading order and conflict resolution.

Defines entry points for the host to manage the plugin's plugin lifecycle.

• initialize: A function called when the plugin is loaded. Often receives configuration.
• onActivate / onDeactivate: Functions called when the plugin is enabled or disabled.
• healthCheck: An optional endpoint or function for the host to perform plugin health checks.
• cleanup: A function called before the plugin is unloaded to release resources.
• These hooks give the host framework control over plugin state, enabling features like hot reloading.

Critical for enterprise and agentic systems, this section outlines security constraints and data handling.

• permissions: An explicit list of actions the plugin is allowed to perform, scrutinized during agentic threat modeling.
• authentication: Declares required API authentication flows (e.g., OAuth scopes, API key headers).
• dataAccess: Describes the categories of data the plugin will read or write.
• sandboxed: A boolean indicating if the plugin requires sandboxing or secure enclave execution.
• This information is used by zero-trust API gateways and permission systems to enforce access control.

A software design pattern that defines a core system (the host) and a standardized mechanism for extending its functionality through modular, independently developed components called plugins. This pattern enables systems to be extensible and maintainable by decoupling core logic from optional features. The plugin manifest is the primary metadata file that describes a plugin within this architecture.

A well-defined interface, hook, or registration mechanism within a host application where a plugin can attach itself to contribute specific functionality. The plugin manifest explicitly declares which extension points a plugin implements. Examples include:

• Adding a new toolbar button in an IDE.
• Registering a new data source connector.
• Defining a custom validation rule in a CI/CD pipeline.

A formal specification, often defined via an Interface Definition Language (IDL) like OpenAPI or Protocol Buffers, that dictates the exact methods, data types, error codes, and behavioral expectations for interaction between software components. A plugin manifest often references or embeds an API contract to define the tool signatures or service endpoints the plugin exposes to the host AI agent.

A security and architecture pattern where plugins declare the specific capabilities or permissions they require at runtime (e.g., network_access, file_system_write, user_data_read). The host system's security policy then grants or denies these capabilities. A plugin manifest is the vehicle for declaring these capabilities, enabling least-privilege execution and sandboxing. This is critical for AI agents executing untrusted third-party tools.

The defined sequence of states a plugin transitions through while managed by a host system. The manifest provides metadata essential for each stage:

• Discovery: The host finds the manifest file.
• Loading/Validation: The host parses the manifest and verifies its schema.
• Initialization: Dependencies are injected, and the plugin's initialize() hook is called.
• Execution: The plugin's functions are invoked.
• Deactivation/Unloading: The plugin is gracefully shut down and removed from memory.

Design patterns where a plugin's required dependencies (services, configurations, other plugins) are provided ('injected') by the host framework, rather than being instantiated by the plugin itself. The plugin manifest often declares its dependencies, allowing the host's IoC container to resolve and inject them at runtime. This promotes loose coupling, testability, and modular design in plugin ecosystems.