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SamMorrowDrums merged 2 commits into from
Jun 8, 2026
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docs: align Catalog mediaType with AI Catalog spec #18

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docs: align Catalog mediaType with AI Catalog spec
SamMorrowDrums Jun 5, 2026
ac36447
style: prettier formatting
SamMorrowDrums Jun 5, 2026
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24 changes: 12 additions & 12 deletions docs/discovery.md
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Original file line number Diff line number Diff line change
Expand Up @@ -50,12 +50,12 @@ An MCP Catalog document is a JSON object that MUST contain the following members

Each entry in the `entries` array describes a single MCP server and MUST contain:

| Member | Type | Required | Description |
| :------------ | :----- | :------- | :------------------------------------------------------------------------------- |
| `identifier` | string | Yes | A URN identifying this server (e.g., `urn:mcp:server:com.example/weather`) |
| `displayName` | string | Yes | A human-readable name for the server |
| `mediaType` | string | Yes | The media type of the referenced artifact. MUST be `application/mcp-server+json` |
| `url` | string | Yes | URL where the full [Server Card](#mcp-server-cards) can be retrieved |
| Member | Type | Required | Description |
| :------------ | :----- | :------- | :------------------------------------------------------------------------------------ |
| `identifier` | string | Yes | A URN identifying this server (e.g., `urn:mcp:server:com.example/weather`) |
| `displayName` | string | Yes | A human-readable name for the server |
| `mediaType` | string | Yes | The media type of the referenced artifact. MUST be `application/mcp-server-card+json` |
| `url` | string | Yes | URL where the full [Server Card](#mcp-server-cards) can be retrieved |

The `identifier` MUST begin with `urn:mcp:server:` and end with the `name` value of the
referenced Server Card, with no characters in between.
Expand All @@ -71,7 +71,7 @@ A domain hosting a single MCP server, using only the required fields:
{
"identifier": "urn:mcp:server:com.example/weather",
"displayName": "Weather Service",
"mediaType": "application/mcp-server+json",
"mediaType": "application/mcp-server-card+json",
"url": "https://example.com/.well-known/mcp-server-card"
}
]
Expand All @@ -89,19 +89,19 @@ A domain hosting several MCP servers, each with its own server card:
{
"identifier": "urn:mcp:server:com.acme/code-review",
"displayName": "Code Review Assistant",
"mediaType": "application/mcp-server+json",
"mediaType": "application/mcp-server-card+json",
"url": "https://acme.com/.well-known/mcp-server-card/code-review"
},
{
"identifier": "urn:mcp:server:com.acme/docs-search",
"displayName": "Documentation Search",
"mediaType": "application/mcp-server+json",
"mediaType": "application/mcp-server-card+json",
"url": "https://acme.com/.well-known/mcp-server-card/docs-search"
},
{
"identifier": "urn:mcp:server:com.acme/ci-cd",
"displayName": "CI/CD Pipeline",
"mediaType": "application/mcp-server+json",
"mediaType": "application/mcp-server-card+json",
"url": "https://acme.com/.well-known/mcp-server-card/ci-cd"
}
]
Expand All @@ -127,14 +127,14 @@ flowchart TD
3. For each entry, retrieve the server card from the entry's `url`
4. Use the server card metadata to configure and establish an MCP connection

Clients SHOULD validate that each entry has `mediaType` set to `application/mcp-server+json`
Clients SHOULD validate that each entry has `mediaType` set to `application/mcp-server-card+json`
and ignore entries with unrecognized media types.

## MCP Server Cards

An **MCP Server Card** is a JSON document that describes a single MCP server — its
identity, capabilities, and connection details. Server Cards use the media type
`application/mcp-server+json`.
`application/mcp-server-card+json`.

A Server Card includes:

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