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

# Data Usage

> Understanding CodeMachine's telemetry and data practices.

## Context Window Display

CodeMachine displays the context window size for each engine in the TUI, sourced from each engine's realtime session data. You can see:

* **Controller Agent Context Window** - The context usage for the controller agent
* **Step Agent Context Window** - The context usage for individual step agents

<Note>
  The context window displayed does not equal your actual token spend. It represents the current context size being used by each agent during the session.
</Note>

## Token Spending

CodeMachine does not spend any extra tokens on its own. It acts purely as a wrapping layer for the underlying engine services.

## Costs and Calculations

All cost calculations and token accounting are handled directly by each engine service provider, not by CodeMachine. This means:

* Billing is determined by the engine you're using (e.g., Anthropic, OpenAI)
* Token counts and pricing follow each provider's standard rates
* CodeMachine passes through requests without adding overhead

For accurate cost tracking, refer to your engine provider's dashboard and billing documentation.