ServerJSON

AI AgentsLinux FoundationOpen SourceStandardsMCPInteroperabilityAgent ProtocolsA2AAGENTS.mdOpen Governance

Properties

Name	Type	Description
$schema	string	JSON Schema URI for this server.json format
_meta	object	Extension metadata using reverse DNS namespacing for vendor-specific data
description	string	Clear human-readable explanation of server functionality.
icons	arraynull	Optional set of sized icons that the client can display in a user interface.
name	string	Server name in reverse-DNS format. Must contain exactly one forward slash separating namespace from server name.
packages	arraynull	Array of package configurations
remotes	arraynull	Array of remote configurations
repository	object	Optional repository metadata for the MCP server source code.
title	string	Optional human-readable title or display name for the MCP server.
version	string	Version string for this server. SHOULD follow semantic versioning.
websiteUrl	string	Optional URL to the server's homepage, documentation, or project website.

View JSON Schema on GitHub

JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://artifacts.apis.io/agentic-ai-foundation/json-schema/agentic-ai-foundation-server-json-schema.json",
  "title": "ServerJSON",
  "x-generated": "2026-11-04",
  "x-method": "derived",
  "x-generator": "derive-json-schema.py",
  "x-source": "openapi/agentic-ai-foundation-publish-api-openapi.yml#/components/schemas/ServerJSON",
  "additionalProperties": false,
  "properties": {
    "$schema": {
      "description": "JSON Schema URI for this server.json format",
      "format": "uri",
      "minLength": 1,
      "type": "string"
    },
    "_meta": {
      "$ref": "#/$defs/ServerMeta",
      "description": "Extension metadata using reverse DNS namespacing for vendor-specific data"
    },
    "description": {
      "description": "Clear human-readable explanation of server functionality.",
      "maxLength": 100,
      "minLength": 1,
      "type": "string"
    },
    "icons": {
      "description": "Optional set of sized icons that the client can display in a user interface.",
      "items": {
        "$ref": "#/$defs/Icon"
      },
      "type": [
        "array",
        "null"
      ]
    },
    "name": {
      "description": "Server name in reverse-DNS format. Must contain exactly one forward slash separating namespace from server name.",
      "maxLength": 200,
      "minLength": 3,
      "pattern": "^[a-zA-Z0-9.-]+/[a-zA-Z0-9._-]+$",
      "type": "string"
    },
    "packages": {
      "description": "Array of package configurations",
      "items": {
        "$ref": "#/$defs/Package"
      },
      "type": [
        "array",
        "null"
      ]
    },
    "remotes": {
      "description": "Array of remote configurations",
      "items": {
        "$ref": "#/$defs/Transport"
      },
      "type": [
        "array",
        "null"
      ]
    },
    "repository": {
      "$ref": "#/$defs/Repository",
      "description": "Optional repository metadata for the MCP server source code."
    },
    "title": {
      "description": "Optional human-readable title or display name for the MCP server.",
      "maxLength": 100,
      "minLength": 1,
      "type": "string"
    },
    "version": {
      "description": "Version string for this server. SHOULD follow semantic versioning.",
      "maxLength": 255,
      "minLength": 1,
      "type": "string"
    },
    "websiteUrl": {
      "description": "Optional URL to the server's homepage, documentation, or project website.",
      "format": "uri",
      "type": "string"
    }
  },
  "required": [
    "$schema",
    "name",
    "description",
    "version"
  ],
  "type": "object",
  "$defs": {
    "Argument": {
      "additionalProperties": false,
      "properties": {
        "choices": {
          "description": "A list of possible values for the input. If provided, the user must select one of these values.",
          "items": {
            "type": "string"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "default": {
          "description": "The default value for the input. This should be a valid value for the input. If you want to provide input examples or guidance, use the placeholder field instead.",
          "type": "string"
        },
        "description": {
          "description": "A description of the input, which clients can use to provide context to the user.",
          "type": "string"
        },
        "format": {
          "description": "Specifies the input format. Supported values include filepath, which should be interpreted as a file on the user's filesystem.",
          "enum": [
            "string",
            "number",
            "boolean",
            "filepath"
          ],
          "type": "string"
        },
        "isRepeated": {
          "description": "Whether the argument can be repeated multiple times.",
          "type": "boolean"
        },
        "isRequired": {
          "description": "Whether the input is required",
          "type": "boolean"
        },
        "isSecret": {
          "description": "Indicates whether the input is a secret value (e.g., password, token). If true, clients should handle the value securely.",
          "type": "boolean"
        },
        "name": {
          "description": "The flag name (for named arguments), including any leading dashes. Empty for positional arguments.",
          "type": "string"
        },
        "placeholder": {
          "description": "A placeholder for the input to be displaying during configuration. This is used to provide examples or guidance about the expected form or content of the input.",
          "type": "string"
        },
        "type": {
          "description": "Argument type: 'positional' or 'named'",
          "type": "string"
        },
        "value": {
          "description": "The value for the input. If this is not set, the user may be prompted to provide a value. Identifiers wrapped in {curly_braces} will be replaced with the corresponding properties from the input variables map.",
          "type": "string"
        },
        "valueHint": {
          "description": "An identifier for positional arguments. Used in transport URL variable substitution.",
          "type": "string"
        },
        "variables": {
          "additionalProperties": {
            "$ref": "#/$defs/Input"
          },
          "description": "A map of variable names to their values. Keys in the input value that are wrapped in {curly_braces} will be replaced with the corresponding variable values.",
          "type": "object"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    },
    "Icon": {
      "additionalProperties": false,
      "properties": {
        "mimeType": {
          "description": "Optional MIME type override if the source MIME type is missing or generic. Must be one of: image/png, image/jpeg, image/jpg, image/svg+xml, image/webp.",
          "enum": [
            "image/png",
            "image/jpeg",
            "image/jpg",
            "image/svg+xml",
            "image/webp"
          ],
          "type": "string"
        },
        "sizes": {
          "description": "Optional array of strings that specify sizes at which the icon can be used. Each string should be in WxH format (e.g., '48x48', '96x96') or 'any' for scalable formats like SVG. If not provided, the client should assume that the icon can be used at any size.",
          "items": {
            "type": "string"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "src": {
          "description": "A standard URI pointing to an icon resource. Must be an HTTPS URL. Consumers SHOULD take steps to ensure URLs serving icons are from the same domain as the server or a trusted domain. Consumers SHOULD take appropriate precautions when consuming SVGs as they can contain executable JavaScript.",
          "format": "uri",
          "maxLength": 255,
          "type": "string"
        },
        "theme": {
          "description": "Optional specifier for the theme this icon is designed for. 'light' indicates the icon is designed to be used with a light background, and 'dark' indicates the icon is designed to be used with a dark background. If not provided, the client should assume the icon can be used with any theme.",
          "enum": [
            "light",
            "dark"
          ],
          "type": "string"
        }
      },
      "required": [
        "src"
      ],
      "type": "object"
    },
    "Input": {
      "additionalProperties": false,
      "properties": {
        "choices": {
          "description": "A list of possible values for the input. If provided, the user must select one of these values.",
          "items": {
            "type": "string"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "default": {
          "description": "The default value for the input. This should be a valid value for the input. If you want to provide input examples or guidance, use the placeholder field instead.",
          "type": "string"
        },
        "description": {
          "description": "A description of the input, which clients can use to provide context to the user.",
          "type": "string"
        },
        "format": {
          "description": "Specifies the input format. Supported values include filepath, which should be interpreted as a file on the user's filesystem.",
          "enum": [
            "string",
            "number",
            "boolean",
            "filepath"
          ],
          "type": "string"
        },
        "isRequired": {
          "description": "Whether the input is required",
          "type": "boolean"
        },
        "isSecret": {
          "description": "Indicates whether the input is a secret value (e.g., password, token). If true, clients should handle the value securely.",
          "type": "boolean"
        },
        "placeholder": {
          "description": "A placeholder for the input to be displaying during configuration. This is used to provide examples or guidance about the expected form or content of the input.",
          "type": "string"
        },
        "value": {
          "description": "The value for the input. If this is not set, the user may be prompted to provide a value. Identifiers wrapped in {curly_braces} will be replaced with the corresponding properties from the input variables map.",
          "type": "string"
        }
      },
      "type": "object"
    },
    "KeyValueInput": {
      "additionalProperties": false,
      "properties": {
        "choices": {
          "description": "A list of possible values for the input. If provided, the user must select one of these values.",
          "items": {
            "type": "string"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "default": {
          "description": "The default value for the input. This should be a valid value for the input. If you want to provide input examples or guidance, use the placeholder field instead.",
          "type": "string"
        },
        "description": {
          "description": "A description of the input, which clients can use to provide context to the user.",
          "type": "string"
        },
        "format": {
          "description": "Specifies the input format. Supported values include filepath, which should be interpreted as a file on the user's filesystem.",
          "enum": [
            "string",
            "number",
            "boolean",
            "filepath"
          ],
          "type": "string"
        },
        "isRequired": {
          "description": "Whether the input is required",
          "type": "boolean"
        },
        "isSecret": {
          "description": "Indicates whether the input is a secret value (e.g., password, token). If true, clients should handle the value securely.",
          "type": "boolean"
        },
        "name": {
          "description": "Name of the header or environment variable.",
          "type": "string"
        },
        "placeholder": {
          "description": "A placeholder for the input to be displaying during configuration. This is used to provide examples or guidance about the expected form or content of the input.",
          "type": "string"
        },
        "value": {
          "description": "The value for the input. If this is not set, the user may be prompted to provide a value. Identifiers wrapped in {curly_braces} will be replaced with the corresponding properties from the input variables map.",
          "type": "string"
        },
        "variables": {
          "additionalProperties": {
            "$ref": "#/$defs/Input"
          },
          "description": "A map of variable names to their values. Keys in the input value that are wrapped in {curly_braces} will be replaced with the corresponding variable values.",
          "type": "object"
        }
      },
      "required": [
        "name"
      ],
      "type": "object"
    },
    "Package": {
      "additionalProperties": false,
      "properties": {
        "environmentVariables": {
          "description": "A mapping of environment variables to be set when running the package.",
          "items": {
            "$ref": "#/$defs/KeyValueInput"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "fileSha256": {
          "description": "SHA-256 hash of the package file for integrity verification. Required for MCPB packages and optional for other package types. Authors are responsible for generating correct SHA-256 hashes when creating server.json. If present, MCP clients must validate the downloaded file matches the hash before running packages to ensure file integrity.",
          "pattern": "^[a-f0-9]{64}$",
          "type": "string"
        },
        "identifier": {
          "description": "Package identifier - either a package name (for registries) or URL (for direct downloads)",
          "minLength": 1,
          "type": "string"
        },
        "packageArguments": {
          "description": "A list of arguments to be passed to the package's binary.",
          "items": {
            "$ref": "#/$defs/Argument"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "registryBaseUrl": {
          "description": "Base URL of the package registry",
          "format": "uri",
          "type": "string"
        },
        "registryType": {
          "description": "Registry type indicating how to download packages (e.g., 'npm', 'pypi', 'cargo', 'oci', 'nuget', 'mcpb')",
          "minLength": 1,
          "type": "string"
        },
        "runtimeArguments": {
          "description": "A list of arguments to be passed to the package's runtime command (such as docker or npx). The runtimeHint field should be provided when runtimeArguments are present.",
          "items": {
            "$ref": "#/$defs/Argument"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "runtimeHint": {
          "description": "A hint to help clients determine the appropriate runtime for the package. This field should be provided when runtimeArguments are present.",
          "type": "string"
        },
        "transport": {
          "$ref": "#/$defs/Transport",
          "description": "Transport protocol configuration for the package"
        },
        "version": {
          "description": "Package version. Must be a specific version. Version ranges are rejected (e.g., '^1.2.3', '~1.2.3', '>=1.2.3', '1.x', '1.*').",
          "maxLength": 255,
          "minLength": 1,
          "type": "string"
        }
      },
      "required": [
        "registryType",
        "identifier",
        "transport"
      ],
      "type": "object"
    },
    "Repository": {
      "additionalProperties": false,
      "properties": {
        "id": {
          "description": "Repository identifier from the hosting service (e.g., GitHub repo ID). Owned and determined by the source forge. Should remain stable across repository renames and may be used to detect repository resurrection attacks - if a repository is deleted and recreated, the ID should change. For GitHub, use: gh api repos/<owner>/<repo> --jq '.id'",
          "type": "string"
        },
        "source": {
          "description": "Repository hosting service identifier. Used by registries to determine validation and API access methods.",
          "type": "string"
        },
        "subfolder": {
          "description": "Optional relative path from repository root to the server location within a monorepo or nested package structure. Must be a clean relative path.",
          "type": "string"
        },
        "url": {
          "description": "Repository URL for browsing source code. Should support both web browsing and git clone operations.",
          "format": "uri",
          "type": "string"
        }
      },
      "type": "object"
    },
    "ServerMeta": {
      "additionalProperties": false,
      "properties": {
        "io.modelcontextprotocol.registry/publisher-provided": {
          "additionalProperties": {},
          "description": "Publisher-provided metadata for downstream registries",
          "type": "object"
        }
      },
      "type": "object"
    },
    "Transport": {
      "additionalProperties": false,
      "properties": {
        "headers": {
          "description": "HTTP headers for streamable-http or sse transports",
          "items": {
            "$ref": "#/$defs/KeyValueInput"
          },
          "type": [
            "array",
            "null"
          ]
        },
        "type": {
          "description": "Transport type (stdio, streamable-http, or sse)",
          "type": "string"
        },
        "url": {
          "description": "URL for streamable-http or sse transports",
          "type": "string"
        },
        "variables": {
          "additionalProperties": {
            "$ref": "#/$defs/Input"
          },
          "description": "Variables for URL templating in remote transports",
          "type": "object"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  }
}

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