extensions

Defines extensions that the client supports.

Extension identifiers use the format {vendor-prefix}/{extension-name}, e.g., "io.modelcontextprotocol/ui". Each value is an extension-specific settings object; an empty JsonObject indicates no settings.

Example:

capabilities {
    extensions(mapOf(
        "io.modelcontextprotocol/ui" to buildJsonObject {
            put("mimeTypes", JsonArray(listOf(JsonPrimitive("text/html"))))
        }
    ))
}

Parameters