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

# Terminology

> Normative definitions used throughout the specification.

| Term                    | Definition                                                                                                                                               |
| ----------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Agent**               | A system that consumes observations and produces actions through the protocol.                                                                           |
| **World**               | An endpoint implementing the world side of the protocol; source of observations, sink of actions.                                                        |
| **Embodiment**          | A controllable presence a world offers to agents (arm, avatar, cursor). Bound to at most one session at a time unless the world declares shared control. |
| **Entity**              | Anything a world reports in observations, including other agents' embodiments.                                                                           |
| **Session**             | The negotiated contract binding an agent to zero or more embodiments, with granted channels, action types, and safety limits.                            |
| **Observation channel** | A named, typed stream of percepts declared in the world manifest.                                                                                        |
| **Frame**               | One timestamped unit of a channel (an image, an event, a proprioception sample).                                                                         |
| **Action**              | A typed intent submitted by an agent, with a defined lifecycle.                                                                                          |
| **Intent**              | The submitted form of an action, prior to acceptance.                                                                                                    |
| **Tick**                | One discrete world step in lockstep mode.                                                                                                                |
| **Session clock**       | The world's monotonic nanosecond clock on which every `ts_mono_ns` is expressed; starts at session open.                                                 |
| **Agent clock**         | The agent's own monotonic nanosecond clock, related to the session clock by the offset estimated over heartbeat exchanges.                               |
| **Clock offset**        | `session clock − agent clock`, estimated from the four timestamps of a `ping` exchange; its error is bounded by half the round-trip time.                |
| **Basis**               | The newest observation an intent relies on, named by its capture time in `basis_ts_mono_ns`.                                                             |
| **Staleness**           | The age of an observation at the moment it is used: session-clock now minus its capture time.                                                            |
| **Time model**          | Either `lockstep` or `streaming`; governs how the world advances relative to agent I/O.                                                                  |
| **Envelope**            | A quantitative safety limit (spatial, velocity, force, rate) enforced by the world.                                                                      |
| **Grant**               | An explicit permission attached to a session (action types, channels, embodiments).                                                                      |
| **Profile**             | A named conformance bundle adding requirements to Core (e.g. `robotics`).                                                                                |
| **Manifest**            | The self-description document exchanged at initialization (world manifest, agent manifest).                                                              |