{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/CompactionStats",
  "title": "CompactionStats",
  "properties": {
    "trigger": {
      "type": "string",
      "title": "Trigger",
      "description": "What triggered the compaction (e.g., 'context_window_exceeded', 'post_step_context_check')"
    },
    "context_tokens_before": {
      "anyOf": [
        {
          "type": "integer"
        },
        {
          "type": "null"
        }
      ],
      "title": "Context Tokens Before",
      "description": "Token count before compaction (from LLM usage stats, includes full context sent to LLM)"
    },
    "context_tokens_after": {
      "anyOf": [
        {
          "type": "integer"
        },
        {
          "type": "null"
        }
      ],
      "title": "Context Tokens After",
      "description": "Token count after compaction (message tokens only, does not include tool definitions)"
    },
    "context_window": {
      "type": "integer",
      "title": "Context Window",
      "description": "The model's context window size"
    },
    "messages_count_before": {
      "type": "integer",
      "title": "Messages Count Before",
      "description": "Number of messages before compaction"
    },
    "messages_count_after": {
      "type": "integer",
      "title": "Messages Count After",
      "description": "Number of messages after compaction"
    }
  },
  "type": "object",
  "required": [
    "trigger",
    "context_window",
    "messages_count_before",
    "messages_count_after"
  ],
  "description": "Statistics about a memory compaction operation."
}