[Bug]: Server `instruction` not present in JSON schema.

[JerryNixon]

What?

The server description is defined in code:

data-api-builder/src/Config/ObjectModel/McpRuntimeOptions.cs

Lines 33 to 37 in 9563a20

	/// <summary>
	/// Description of the MCP server to be exposed in the initialize response
	/// </summary>
	[JsonPropertyName("description")]
	public string? Description { get; init; }

But the server description is not defined in the JSON Schema:

data-api-builder/schemas/dab.draft.schema.json

Lines 268 to 358 in 9563a20

	"mcp": {
	"type": "object",
	"description": "Global MCP endpoint configuration",
	"additionalProperties": false,
	"properties": {
	"path": {
	"default": "/mcp",
	"type": "string",
	"description": "URL prefix path for MCP endpoints."
	},
	"enabled": {
	"$ref": "#/$defs/boolean-or-string",
	"description": "Allow enabling/disabling MCP requests for all entities.",
	"default": true
	},
	"dml-tools": {
	"description": "Configuration for MCP Data Manipulation Language (DML) tools. Set to true/false to enable/disable all tools, or use an object to configure individual tools.",
	"oneOf": [
	{
	"$ref": "#/$defs/boolean-or-string",
	"description": "Enable/disable all DML tools with default settings."
	},
	{
	"type": "object",
	"description": "Individual DML tools configuration",
	"additionalProperties": false,
	"properties": {
	"describe-entities": {
	"$ref": "#/$defs/boolean-or-string",
	"description": "Enable/disable the describe-entities tool.",
	"default": false
	},
	"create-record": {
	"$ref": "#/$defs/boolean-or-string",
	"description": "Enable/disable the create-record tool.",
	"default": false
	},
	"read-records": {
	"$ref": "#/$defs/boolean-or-string",
	"description": "Enable/disable the read-records tool.",
	"default": false
	},
	"update-record": {
	"$ref": "#/$defs/boolean-or-string",
	"description": "Enable/disable the update-record tool.",
	"default": false
	},
	"delete-record": {
	"$ref": "#/$defs/boolean-or-string",
	"description": "Enable/disable the delete-record tool.",
	"default": false
	},
	"execute-entity": {
	"$ref": "#/$defs/boolean-or-string",
	"description": "Enable/disable the execute-entity tool.",
	"default": false
	},
	"aggregate-records": {
	"description": "Enable/disable or configure the aggregate-records MCP tool.",
	"oneOf": [
	{
	"$ref": "#/$defs/boolean-or-string",
	"description": "Enable/disable the aggregate-records tool."
	},
	{
	"type": "object",
	"description": "Aggregate records tool configuration",
	"additionalProperties": false,
	"properties": {
	"enabled": {
	"$ref": "#/$defs/boolean-or-string",
	"description": "Enable/disable the aggregate-records tool.",
	"default": true
	},
	"query-timeout": {
	"type": "integer",
	"description": "Execution timeout in seconds for aggregate queries. Range: 1-600.",
	"default": 30,
	"minimum": 1,
	"maximum": 600
	}
	}
	}
	],
	"default": false
	}
	}
	}
	]
	}
	}

Fix

This is what is missing

"description": {
  "type": "string",
  "description": "Description of the MCP server, exposed as the 'instructions' field in the MCP initialize response to provide behavioral context to MCP clients and agents."
}