> ## Documentation Index
> Fetch the complete documentation index at: https://agenticbrowserprotocol.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Glossary

> Standard terms used throughout the ABP specification and documentation

| Term                    | Definition                                                                                                          |
| ----------------------- | ------------------------------------------------------------------------------------------------------------------- |
| **ABP**                 | Agentic Browser Protocol                                                                                            |
| **ABP Manifest**        | JSON file describing an app's ABP support and capabilities                                                          |
| **ABP Runtime**         | App-side implementation exposed on `window.abp`                                                                     |
| **ABP Client**          | Any agent-side implementation for interacting with ABP apps                                                         |
| **AbortSignal**         | Web standard for signaling cancellation, used by ABP for cancel support                                             |
| **Agent**               | AI system or CLI tool consuming ABP capabilities                                                                    |
| **App**                 | Web application implementing ABP                                                                                    |
| **Base64**              | Binary-to-text encoding used for binary data over WebSocket transport                                               |
| **BinaryData**          | Wrapper object for binary content with mimeType, encoding, and size metadata                                        |
| **BinaryDataReference** | Reference to large binary content via downloadUrl instead of inline data                                            |
| **Call ID**             | Unique identifier for a capability call, used for cancellation                                                      |
| **Cancellation**        | Aborting an in-progress operation before completion                                                                 |
| **Capability**          | Browser feature exposed through ABP                                                                                 |
| **Call**                | Execute a capability (equivalent to MCP's `tools/call`)                                                             |
| **Contract**            | The interface definition (manifest + `window.abp`) that ABP specifies, independent of any client implementation     |
| **Discovery**           | Process of determining if an app supports ABP and what it offers                                                    |
| **Elicitation**         | App requesting input from agent (equivalent to MCP's elicitation)                                                   |
| **Headful Mode**        | Browser launched with a visible window, required for full ABP capability access                                     |
| **Manifest Link**       | HTML `<link rel="abp-manifest">` tag pointing to the manifest                                                       |
| **MCP Bridge**          | Recommended client architecture: a generic MCP server that translates ABP capabilities into MCP tools for AI agents |
| **Notification**        | One-way message from app to agent                                                                                   |
| **Session**             | Active connection between agent and app                                                                             |
| **Transfer List**       | postMessage feature for zero-copy ArrayBuffer transfer                                                              |
| **Transport**           | Communication layer (Puppeteer, postMessage, WebSocket) used by a client implementation                             |

## See Also

* [API Reference](/reference/api)
* [Protocol Overview](/concepts/protocol-overview)