{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Agent Tool hook",
  "type": "object",
  "required": [
    "schema_version",
    "hook_id",
    "hook_event"
  ],
  "properties": {
    "schema_version": {
      "type": "string"
    },
    "hook_id": {
      "type": "string"
    },
    "hook_event": {
      "enum": [
        "pre_tool_use",
        "post_tool_use",
        "post_tool_use_failure",
        "permission_request",
        "permission_decision",
        "result_persistence"
      ]
    },
    "invocation_id": {
      "type": "string"
    },
    "tool_id": {
      "type": "string"
    },
    "matcher": {
      "type": "object",
      "additionalProperties": true
    },
    "outputs": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": true
      }
    },
    "permission_result": {
      "type": "object",
      "additionalProperties": true
    },
    "updated_input": {},
    "additional_context": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": true
      }
    },
    "stop": {
      "type": "object",
      "additionalProperties": true
    },
    "updated_output": {},
    "started_at": {
      "type": "string"
    },
    "ended_at": {
      "type": "string"
    }
  },
  "additionalProperties": true
}