{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "MCP Tool Plugin Schema",
  "description": "Schema for custom MCP tool plugins in Loki Mode",
  "type": "object",
  "required": ["type", "name", "description", "command"],
  "properties": {
    "type": {
      "const": "mcp_tool"
    },
    "name": {
      "type": "string",
      "pattern": "^[a-z][a-z0-9-]{2,49}$",
      "description": "Unique tool name (lowercase, 3-50 chars, alphanumeric and hyphens)"
    },
    "description": {
      "type": "string",
      "maxLength": 500,
      "description": "Human-readable description of the MCP tool"
    },
    "command": {
      "type": "string",
      "maxLength": 1000,
      "description": "Command to execute when tool is invoked"
    },
    "parameters": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["name", "type"],
        "properties": {
          "name": {
            "type": "string",
            "description": "Parameter name"
          },
          "type": {
            "type": "string",
            "enum": ["string", "number", "boolean"],
            "description": "Parameter type"
          },
          "description": {
            "type": "string",
            "description": "Parameter description"
          },
          "required": {
            "type": "boolean",
            "default": false,
            "description": "Whether the parameter is required"
          },
          "default": {
            "description": "Default value for the parameter"
          }
        },
        "additionalProperties": false
      },
      "description": "Tool input parameters"
    },
    "timeout_ms": {
      "type": "integer",
      "minimum": 1000,
      "maximum": 120000,
      "default": 30000,
      "description": "Maximum execution time in milliseconds"
    },
    "working_directory": {
      "type": "string",
      "enum": ["project", "plugin"],
      "default": "project",
      "description": "Working directory for command execution"
    }
  },
  "additionalProperties": false
}