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docs(discovery): rename Catalog Entry mediaType field to type (ADR 0014) #32

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SamMorrowDrums merged 1 commit into from
Jul 13, 2026
+11 −11
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docs(discovery): rename Catalog Entry mediaType field to type (ADR 0014) #32

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22 changes: 11 additions & 11 deletions docs/discovery.md
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Original file line number Diff line number Diff line change
Expand Up @@ -50,11 +50,11 @@ 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 logical discovery URN for this server (e.g., `urn:air:example.com:weather`) |
| `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 |
| Member | Type | Required | Description |
| :----------- | :----- | :------- | :------------------------------------------------------------------------------------------------------- |
| `identifier` | string | Yes | A logical discovery URN for this server (e.g., `urn:air:example.com:weather`) |
| `type` | string | Yes | An identifier specifying the 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 |

An MCP Catalog entry carries no human-readable-name field. Every entry references a
[Server Card](#mcp-server-cards), and the Server Card's `title` is the source of truth for
Expand Down Expand Up @@ -100,7 +100,7 @@ A domain hosting a single MCP server:
"entries": [
{
"identifier": "urn:air:example.com:weather",
"mediaType": "application/mcp-server-card+json",
"type": "application/mcp-server-card+json",
"url": "https://example.com/mcp/server-card"
}
]
Expand All @@ -117,17 +117,17 @@ A domain hosting several MCP servers, each with its own server card:
"entries": [
{
"identifier": "urn:air:acme.com:code-review",
"mediaType": "application/mcp-server-card+json",
"type": "application/mcp-server-card+json",
"url": "https://acme.com/code-review/server-card"
},
{
"identifier": "urn:air:acme.com:docs-search",
"mediaType": "application/mcp-server-card+json",
"type": "application/mcp-server-card+json",
"url": "https://acme.com/docs-search/server-card"
},
{
"identifier": "urn:air:acme.com:ci-cd",
"mediaType": "application/mcp-server-card+json",
"type": "application/mcp-server-card+json",
"url": "https://acme.com/ci-cd/server-card"
}
]
Expand Down Expand Up @@ -155,8 +155,8 @@ flowchart TD
[Server Card Location](#server-card-location))
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-card+json`
and ignore entries with unrecognized media types.
Clients SHOULD validate that each entry has `type` set to `application/mcp-server-card+json`
and ignore entries with unrecognized types.

## MCP Server Cards

Expand Down
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