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Use ai-stats:apply_patch when a Responses workflow should return file changes as structured patch operations. AI Stats validates the operation and returns it to your client; it does not mutate your filesystem or repository.
ai-stats:apply_patch is available on /v1/responses.

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Request

curl https://api.phaseo.app/v1/responses \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5-nano",
    "input": "Create a small README patch for this project.",
    "tools": [
      { "type": "ai-stats:apply_patch" }
    ]
  }'

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Operation Shape

When the model calls the tool, it sends an operation object: 
{
  "operation": {
    "type": "update_file",
    "path": "/README.md",
    "diff": "@@ ...\n-Old text\n+New text\n"
  }
}
Supported operation types:
TypeRequired fields
create_filepath, diff
update_filepath, diff
delete_filepath

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Tool Result

AI Stats returns the validated operation to the model loop: 
{
  "status": "completed",
  "operation": {
    "type": "update_file",
    "path": "/README.md",
    "diff": "@@ ...\n-Old text\n+New text\n"
  },
  "message": "Patch operation validated. The client must apply or reject this patch and report the result."
}
Your application remains responsible for applying the patch, showing it to a user, rejecting it, or asking the model for a revised operation.

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Usage And Pricing

AI Stats records: 
{
  "usage": {
    "server_tool_use": {
      "apply_patch_requests": 1
    }
  }
}
Pricing cards can bill this with the server_tool_apply_patch_requests meter.
Last modified on June 11, 2026