Group

Interfaces

Protocols and UI contracts between agents and hosts.

• Agent Plugins failure isolation

  Reject invalid components narrowly without disabling valid components in the same package.

• Agent Plugins packaged MCP

  Load MCP server configuration contained in an Agent Plugins package.

• Agent Plugins packaged skills

  Load portable Agent Skills contained in an Agent Plugins package.

• Agent Plugins portable manifest

  Load the published portable plugin.json manifest and its core components.

• AGENTS.md root instructions

  Discover and apply the cross-agent AGENTS.md convention at repository scope.

• Custom instructions

  Persist project or user instruction files.

• MCP Apps

  Render an interactive interface returned by an MCP server inside the product.

• MCP cancellation

  Cancel an in-flight MCP request and handle cancellation correctly.

• MCP client role

  Consume capabilities exposed by MCP servers.

• MCP elicitation

  Handle structured user-input requests initiated by an MCP server.

• MCP legacy HTTP and SSE

  Connect through the superseded HTTP plus SSE transport when migration compatibility is required.

• MCP list-changed notifications

  Refresh capability lists when a server announces dynamic changes.

• MCP logging

  Receive structured log messages emitted by an MCP server.

• MCP OAuth authorization

  Complete the MCP authorization flow for protected remote servers.

• MCP progress notifications

  Receive progress updates for long-running requests.

• MCP prompt-list notifications

  Refresh prompt templates after a server announces changes.

• MCP prompts

  Invoke reusable MCP prompt templates.

• MCP Registry metadata

  Discover MCP servers and metadata through the official registry model.

• MCP resource subscriptions

  Subscribe to resource changes and receive update notifications.

• MCP resources

  Read MCP resources as live context.

• MCP revision compatibility

  Implement or negotiate the exact dated MCP revision.

• MCP roots

  Provide filesystem or workspace roots to an MCP server.

• MCP sampling

  Handle server requests for model sampling through the client.

• MCP server instructions

  Consume server-provided instructions during initialization.

• MCP server role

  Expose capabilities from the harness as an MCP server.

• MCP stdio transport

  Connect to a local MCP server over standard input and output.

• MCP Streamable HTTP

  Connect to an MCP server over the current Streamable HTTP transport.

• MCP task listing

  List and page through tasks exposed by the task utility.

• MCP tasks

  Create, inspect, and manage long-running MCP tasks.

• MCP tools

  Invoke operations exposed by a Model Context Protocol server.

• Model Context Protocol

  Track tools, prompts, resources, and interactive apps as independent parts of MCP.

• Native plugin system

  Install and load a product-specific extension package.

• Nested AGENTS.md instructions

  Apply nested AGENTS.md files with directory-sensitive precedence.

• Persistent instructions

  Track portable and product-native instruction discovery independently.

• Plugin marketplace and installation

  Discover, install, update, and remove extensions through a registry or marketplace.

• Plugin systems

  Track portable and product-native extension capabilities independently.

• Plugin vendor extensions

  Preserve namespaced host-specific behavior without representing it as portable core support.

• Product-native rules

  Discover persistent or path-scoped instructions in the product's own rule format.

• Streaming output

  Show tokens and tool events as they arrive.

• Structured output

  Return JSON or schema-validated objects.

• WebMCP

  Expose website functionality as structured tools through a browser-mediated agent boundary.

• WebMCP declarative form tools

  Expose semantic HTML forms as structured tools through WebMCP annotations.

• WebMCP execution cancellation

  Cancel pending tool registration or execution through abort signals and lifecycle rules.

• WebMCP imperative tools

  Register JavaScript-backed tools through document.modelContext.registerTool().

• WebMCP permissions policy

  Gate tool exposure across documents and origins through the tools permissions policy.

• WebMCP security annotations

  Communicate read-only and untrusted-content hints across the site-to-agent boundary.

• WebMCP tool discovery

  Expose the active page tool list and schemas to a WebMCP-aware agent.

• WebMCP tool execution

  Invoke a page tool with structured arguments and return its result to the agent.