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

# C2A vs C2R

> Compare agent execution vs robot execution under CXP

> 🟢 **Status:** STABLE\
> **Applies to:** CXP-Agent · CXP-Robot\
> **Last updated:** 2026-02-01

## Quick comparison

| Dimension    | C2A (Agent)                    | C2R (Robot)                       |
| ------------ | ------------------------------ | --------------------------------- |
| Target       | tools/APIs                     | actuators/sensors                 |
| Primary risk | permissions/data integrity     | physical safety                   |
| Constraints  | scopes, approvals, rate limits | speed/force, zones                |
| Validation   | schema + policy                | schema + policy + safety envelope |
| Receipt      | outputs + audit                | telemetry + safety events + audit |

## Practical guidance

Use **C2A** when your execution is primarily digital and tool-driven.
Use **C2R** when execution affects the physical world and needs safety envelopes.

## This page is in progress

This section is actively being drafted for the CXP protocol. Content may change as the spec evolves and community feedback is incorporated.

### What will be added here

* Clear definitions and terminology
* End-to-end examples (capsule → match → plan → execute → receipt)
* Normative requirements for compliance (where applicable)
* Security and safety considerations

### Contribute

* Propose changes via **/community/cxp-guidelines**
* Submit issues or pull requests in the GitHub repository