Auto-cache: Anthropic tool results

What it does

When the request submits tool results, this transform inserts an Anthropic ephemeral cache_control breakpoint on the latest user node before the tool-call run. In an agent loop, the growing conversation prefix then stays cached between iterations.

Requests without tool results pass through unchanged.

Reference

When to use

• Agent clients run long tool loops against an Anthropic-compatible upstream.
• You want each loop iteration to re-read the conversation prefix from cache instead of paying full input price.

Configuration

This transform has no options. Use an empty config object.

Example rule

{
  "transform": "cache_anthropic_tool_use",
  "enabled": true,
  "phase": "request",
  "models": [
    "claude-*"
  ],
  "config": {}
}