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# Official Registry Documentation
[`openapi.yaml`](./openapi.yaml) - OpenAPI specification for the official registry API
[`api_examples.md`](./api_examples.md) - Examples of what data will actually look like coming from the official registry API
[`MCP Developers Summit 2025 - Registry Talk Slides.pdf`](./MCP%20Developers%20Summit%202025%20-%20Registry%20Talk%20Slides.pdf) - Slides from a talk given at the MCP Developers Summit on May 23, 2025, with an up-to-date vision of how we are thinking about the official registry.

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# Examples
## /v0/servers
### Request
```http
GET /v0/servers?limit=5000&offset=0
```
### Response
```json
{
"servers": [
{
"id": "a5e8a7f0-d4e4-4a1d-b12f-2896a23fd4f1",
"name": "io.modelcontextprotocol/filesystem",
"description": "Node.js server implementing Model Context Protocol (MCP) for filesystem operations.",
"repository": {
"url": "https://github.com/modelcontextprotocol/servers",
"source": "github",
"id": "b94b5f7e-c7c6-d760-2c78-a5e9b8a5b8c9"
},
"version_detail": {
"version": "1.0.2",
"release_date": "2023-06-15T10:30:00Z",
"is_latest": true
}
}
],
"next": "https://registry.modelcontextprotocol.io/servers?offset=50",
"total_count": 1
}
```
## /v0/servers/:id
### Request
```http
GET /v0/servers/a5e8a7f0-d4e4-4a1d-b12f-2896a23fd4f1?version=0.0.3
```
### Response
```json
{
"id": "a5e8a7f0-d4e4-4a1d-b12f-2896a23fd4f1",
"name": "io.modelcontextprotocol/filesystem",
"description": "Node.js server implementing Model Context Protocol (MCP) for filesystem operations.",
"repository": {
"url": "https://github.com/modelcontextprotocol/servers",
"source": "github",
"id": "b94b5f7e-c7c6-d760-2c78-a5e9b8a5b8c9"
},
"version_detail": {
"version": "1.0.2",
"release_date": "2023-06-15T10:30:00Z",
"is_latest": true
},
"packages": [
{
"registry_name": "npm",
"name": "@modelcontextprotocol/server-filesystem",
"version": "1.0.2",
"package_arguments": [
{
"type": "positional",
"value_hint": "target_dir",
"description": "Path to access",
"default": "/Users/username/Desktop",
"is_required": true,
"is_repeated": true
}
],
"environment_variables": [
{
"name": "LOG_LEVEL",
"description": "Logging level (debug, info, warn, error)",
"default": "info"
}
]
},
{
"registry_name": "docker",
"name": "mcp/filesystem",
"version": "1.0.2",
"runtime_arguments": [
{
"type": "named",
"description": "Mount a volume into the container",
"name": "--mount",
"value": "type=bind,src={source_path},dst={target_path}",
"is_required": true,
"is_repeated": true,
"variables": {
"source_path": {
"description": "Source path on host",
"format": "filepath",
"is_required": true
},
"target_path": {
"description": "Path to mount in the container. It should be rooted in `/project` directory.",
"is_required": true,
"default": "/project",
}
}
}
],
"package_arguments": [
{
"type": "positional",
"value_hint": "target_dir",
"value": "/project",
}
],
"environment_variables": [
{
"name": "LOG_LEVEL",
"description": "Logging level (debug, info, warn, error)",
"default": "info"
}
]
}
],
"remotes": [
{
"transport_type": "sse",
"url": "https://mcp-fs.example.com/sse"
}
]
}
```
### Server Configuration Examples
#### Local Server with npx
API Response:
```json
{
"id": "brave-search-12345",
"name": "io.modelcontextprotocol/brave-search",
"description": "MCP server for Brave Search API integration",
"repository": {
"url": "https://github.com/modelcontextprotocol/servers",
"source": "github",
"id": "abc123de-f456-7890-ghij-klmnopqrstuv"
},
"version_detail": {
"version": "1.0.2",
"release_date": "2023-06-15T10:30:00Z",
"is_latest": true
},
"packages": [
{
"registry_name": "npm",
"name": "@modelcontextprotocol/server-brave-search",
"version": "1.0.2",
"environment_variables": [
{
"name": "BRAVE_API_KEY",
"description": "Brave Search API Key",
"is_required": true,
"is_secret": true
}
]
}
]
}
```
claude_desktop_config.json:
```json
{
"brave-search": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/server-brave-search"
],
"env": {
"BRAVE_API_KEY": "YOUR_API_KEY_HERE"
}
}
}
```
#### Local Server with Docker
API Response:
```json
{
"id": "filesystem-67890",
"name": "io.modelcontextprotocol/filesystem",
"description": "Node.js server implementing Model Context Protocol (MCP) for filesystem operations",
"repository": {
"url": "https://github.com/modelcontextprotocol/servers",
"source": "github",
"id": "d94b5f7e-c7c6-d760-2c78-a5e9b8a5b8c9"
},
"version_detail": {
"version": "1.0.2",
"release_date": "2023-06-15T10:30:00Z",
"is_latest": true
},
"packages": [
{
"registry_name": "docker",
"name": "mcp/filesystem",
"version": "1.0.2",
"runtime_arguments": [
{
"type": "named",
"description": "Mount a volume into the container",
"name": "--mount",
"value": "type=bind,src={source_path},dst={target_path}",
"is_required": true,
"is_repeated": true,
"variables": {
"source_path": {
"description": "Source path on host",
"format": "filepath",
"is_required": true
},
"target_path": {
"description": "Path to mount in the container. It should be rooted in `/project` directory.",
"is_required": true,
"default": "/project",
}
}
}
],
"package_arguments": [
{
"type": "positional",
"value_hint": "target_dir",
"value": "/project",
}
]
}
]
}
```
claude_desktop_config.json:
```json
{
"filesystem": {
"server": "@modelcontextprotocol/servers/src/filesystem@1.0.2",
"package": "docker",
"settings": {
"--mount": [
{ "source_path": "/Users/username/Desktop", "target_path": "/project/desktop" },
{ "source_path": "/path/to/other/allowed/dir", "target_path": "/project/other/allowed/dir,ro" },
]
}
}
}
```
#### Remote Server
API Response:
```json
{
"id": "remote-fs-54321",
"name": "Remote Brave Search Server",
"description": "Cloud-hosted MCP Brave Search server",
"repository": {
"url": "https://github.com/example/remote-fs",
"source": "github",
"id": "xyz789ab-cdef-0123-4567-890ghijklmno"
},
"version_detail": {
"version": "1.0.2",
"release_date": "2023-06-15T10:30:00Z",
"is_latest": true
},
"remotes": [
{
"transport_type": "sse",
"url": "https://mcp-fs.example.com/sse"
}
]
}
```

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openapi: 3.1.0
info:
title: MCP Server Registry API
summary: API for discovering and accessing MCP servers metadata
description: |
REST API that centralizes metadata about publicly available MCP servers by allowing server creators to submit
and maintain metadata about their servers in a standardized format. This API enables MCP client
applications and "server aggregator" type consumers to discover and install MCP servers.
version: 0.0.1
contact:
name: MCP Community Working Group
license:
name: MIT
identifier: MIT
servers:
# TODO: Still think a unique name would be better; maybe we open a public discussion on the topic and let people submit ideas?
- url: https://registry.modelcontextprotocol.io
description: MCP Server Registry
# TODO: Webhooks here would be interesting, but out of scope for MVP
paths:
/v0/servers:
get:
summary: List MCP servers
description: Returns a list of all registered MCP servers
parameters:
- name: limit
in: query
description: Number of results per page (maximum 5000)
schema:
type: integer
default: 5000
maximum: 5000
minimum: 1
- name: offset
in: query
description: Number of results to skip for pagination
schema:
type: integer
default: 0
minimum: 0
responses:
'200':
description: A list of MCP servers
content:
application/json:
schema:
$ref: '#/components/schemas/ServerList'
/v0/servers/{id}:
get:
summary: Get MCP server details
description: Returns detailed information about a specific MCP server
parameters:
- name: id
in: path
required: true
description: Unique ID of the server
schema:
type: string
format: uuid
- name: version
in: query
description: Desired MCP server version
schema:
type: string
responses:
'200':
description: Detailed server information
content:
application/json:
schema:
$ref: '#/components/schemas/ServerDetail'
'404':
description: Server not found
content:
application/json:
schema:
type: object
properties:
error:
type: string
example: "Server not found"
components:
schemas:
jsonSchemaDialect: "https://json-schema.org/draft/2020-12/schema"
Repository:
type: object
required:
- url
- source
- id
properties:
url:
type: string
format: uri
example: "https://github.com/modelcontextprotocol/servers"
source:
type: string
enum: [github, gitlab] # TODO: Add all supported sources as a whitelist
example: "github"
id:
type: string
example: "b94b5f7e-c7c6-d760-2c78-a5e9b8a5b8c9"
Server:
type: object
required:
- id
- name
- description
- repository
- version_detail
properties:
id:
type: string
format: uuid
example: "a5e8a7f0-d4e4-4a1d-b12f-2896a23fd4f1"
name:
type: string
example: "@modelcontextprotocol/servers/src/filesystem"
description:
type: string
example: "Node.js server implementing Model Context Protocol (MCP) for filesystem operations."
repository:
$ref: '#/components/schemas/Repository'
version_detail:
type: object
required:
- version
- release_date
- is_latest
properties:
version:
type: string
example: "1.0.2"
description: Equivalent of Implementation.version in MCP specification.
release_date:
type: string
format: date-time
example: "2023-06-15T10:30:00Z"
description: Datetime that the MCP server version was published to the registry.
is_latest:
type: boolean
example: true
description: Whether the MCP server version is the latest version available in the registry.
$schema: "https://json-schema.org/draft/2020-12/schema"
ServerList:
type: object
required:
- servers
- total_count
properties:
servers:
type: array
items:
$ref: '#/components/schemas/Server'
next:
type: string
format: uri
example: "https://registry.modelcontextprotocol.io/servers?offset=50"
total_count:
type: integer
example: 1
Package:
type: object
required:
- registry_name
- name
- version
properties:
registry_name:
type: string
enum: [npm, docker, pypi, homebrew]
example: "npm"
name:
type: string
example: "io.modelcontextprotocol/filesystem"
version:
type: string
example: "1.0.2"
runtime_hint:
type: string
description: A hint to help clients determine the appropriate runtime for the package. This field should be provided when `runtime_arguments` are present.
examples: [npx, uvx]
runtime_arguments:
type: array
description: A list of arguments to be passed to the package's runtime command (such as docker or npx). The `runtime_hint` field should be provided when `runtime_arguments` are present.
items:
$ref: '#/components/schemas/Argument'
package_arguments:
type: array
description: A list of arguments to be passed to the package's binary.
items:
$ref: '#/components/schemas/Argument'
environment_variables:
type: array
description: A mapping of environment variables to be set when running the package.
items:
$ref: '#/components/schemas/KeyValueInput'
Input:
type: object
properties:
description:
description: A description of the input, which clients can use to provide context to the user.
type: string
is_required:
type: boolean
default: false
format:
type: string
description: |
Specifies the input format. Supported values include `filepath`, which should be interpreted as a file on the user's filesystem.
When the input is converted to a string, booleans should be represented by the strings "true" and "false", and numbers should be represented as decimal values.
enum: [string, number, boolean, filepath]
default: string
value:
type: string
description: |
The default 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. If an identifier in braces is not found in `variables`, or if `variables` is not provided, the `{curly_braces}` substring should remain unchanged.
is_secret:
type: boolean
description: Indicates whether the input is a secret value (e.g., password, token). If true, clients should handle the value securely.
default: false
default:
type: string
description: The default value for the input.
choices:
type: array
description: A list of possible values for the input. If provided, the user must select one of these values.
items:
type: string
example: []
InputWithVariables:
allOf:
- $ref: '#/components/schemas/Input'
- type: object
properties:
variables:
type: object
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.
additionalProperties:
$ref: '#/components/schemas/Input'
PositionalArgument:
description: A positional input is a value inserted verbatim into the command line.
allOf:
- $ref: '#/components/schemas/InputWithVariables'
- type: object
required:
- type
- value_hint
properties:
type:
type: string
enum: [positional]
example: "positional"
value_hint:
type: string
description: An identifier-like hint for the value. This is not part of the command line, but can be used by client configuration and to provide hints to users.
example: file_path
is_repeated:
type: boolean
description: Whether the argument can be repeated multiple times in the command line.
default: false
NamedArgument:
description: A command-line `--flag={value}`.
allOf:
- $ref: '#/components/schemas/InputWithVariables'
- type: object
required:
- type
- name
properties:
type:
type: string
enum: [named]
example: "named"
name:
type: string
description: The flag name, including any leading dashes.
example: "--port"
is_repeated:
type: boolean
description: Whether the argument can be repeated multiple times.
default: false
KeyValueInput:
allOf:
- $ref: '#/components/schemas/InputWithVariables'
- type: object
required:
- name
properties:
name:
type: string
description: Name of the header or environment variable.
example: SOME_VARIABLE
Argument:
anyOf:
- $ref: '#/components/schemas/PositionalArgument'
- $ref: '#/components/schemas/NamedArgument'
Remote:
type: object
required:
- transport_type
- url
properties:
transport_type:
type: string
enum: [streamable, sse]
example: "sse"
url:
type: string
format: uri
example: "https://mcp-fs.example.com/sse"
headers:
type: array
items:
$ref: '#/components/schemas/KeyValueInput'
ServerDetail:
allOf:
- $ref: '#/components/schemas/Server'
- type: object
properties:
packages:
type: array
items:
$ref: '#/components/schemas/Package'
remotes:
type: array
items:
$ref: '#/components/schemas/Remote'