Class McpOutputSchemaAttribute

Marks a static method as providing a custom output schema for an MCP tool. Output schemas help MCP clients understand the structure of tool return values.

Inheritance
object
Attribute
McpOutputSchemaAttribute
Implements
Inherited Members
Namespace: Unity.AI.MCP.Editor.ToolRegistry
Assembly: Unity.AI.MCP.Editor.dll
Syntax
[AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
public class McpOutputSchemaAttribute : Attribute, _Attribute
Remarks

The schema method must:

  • Be public static
  • Return an object representing the JSON schema for the output
  • Have no parameters

The ToolName must match the name used in the [McpTool] attribute. For class-based tools, implement GetOutputSchema() instead.

Examples
[McpTool("calculate", "Performs a calculation")]
public static object Calculate(JObject params)
{
    return new { result = 42, unit = "answer" };
}

[McpOutputSchema("calculate")]
public static object CalculateOutputSchema()
{
    return new
    {
        type = "object",
        properties = new
        {
            result = new { type = "number", description = "Calculation result" },
            unit = new { type = "string", description = "Unit of measurement" }
        },
        required = new[] { "result" }
    };
}

Constructors

McpOutputSchemaAttribute(string)

Creates an output schema attribute linking this method to an MCP tool.

Declaration
public McpOutputSchemaAttribute(string toolName)
Parameters
Type Name Description
string toolName

The name of the tool this output schema is for (must match the [McpTool] name exactly)
Exceptions
Type Condition
ArgumentException

Thrown if toolName is null or empty

Properties

ToolName

Gets the name of the tool this schema method provides the output schema for. Must exactly match the name used in the corresponding [McpTool] attribute.

Declaration
public string ToolName { get; }
Property Value
Type Description
string

Implements