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Add Extensions support to ClientCapabilities and ServerCapabilities (#1317)

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
This commit is contained in:
Copilot 2026-02-21 00:08:20 -08:00 • committed by GitHub
commit c2aa6a5123
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2 changed files with 164 additions and 3 deletions
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45
tests/ModelContextProtocol.Tests/Protocol/ClientCapabilitiesTests.cs
View file

@ -21,7 +21,11 @@ public static class ClientCapabilitiesTests
Form = new FormElicitationCapability(),
Url = new UrlElicitationCapability()
},
Tasks = new McpTasksCapability()
Tasks = new McpTasksCapability(),
Extensions = new Dictionary<string, object>
{
["io.modelcontextprotocol/test"] = new object()
}
};
string json = JsonSerializer.Serialize(original, McpJsonUtilities.DefaultOptions);
@ -37,6 +41,8 @@ public static class ClientCapabilitiesTests
Assert.NotNull(deserialized.Elicitation.Form);
Assert.NotNull(deserialized.Elicitation.Url);
Assert.NotNull(deserialized.Tasks);
Assert.NotNull(deserialized.Extensions);
Assert.True(deserialized.Extensions.ContainsKey("io.modelcontextprotocol/test"));
}
[Fact]
@ -53,5 +59,42 @@ public static class ClientCapabilitiesTests
Assert.Null(deserialized.Sampling);
Assert.Null(deserialized.Elicitation);
Assert.Null(deserialized.Tasks);
Assert.Null(deserialized.Extensions);
}
[Fact]
public static void ClientCapabilities_Extensions_DeserializesFromJson()
{
string json = """
{
"extensions": {
"io.modelcontextprotocol/oauth-client-credentials": {},
"io.modelcontextprotocol/test-extension": {
"setting1": "value1",
"setting2": 42
}
}
}
""";
var deserialized = JsonSerializer.Deserialize<ClientCapabilities>(json, McpJsonUtilities.DefaultOptions);
Assert.NotNull(deserialized);
Assert.NotNull(deserialized.Extensions);
Assert.Equal(2, deserialized.Extensions.Count);
Assert.True(deserialized.Extensions.ContainsKey("io.modelcontextprotocol/oauth-client-credentials"));
Assert.True(deserialized.Extensions.ContainsKey("io.modelcontextprotocol/test-extension"));
}
[Fact]
public static void ClientCapabilities_Extensions_EmptyObjectDeserializesAsEmptyDictionary()
{
string json = """{"extensions": {}}""";
var deserialized = JsonSerializer.Deserialize<ClientCapabilities>(json, McpJsonUtilities.DefaultOptions);
Assert.NotNull(deserialized);
Assert.NotNull(deserialized.Extensions);
Assert.Empty(deserialized.Extensions);
}
}

45
tests/ModelContextProtocol.Tests/Protocol/ServerCapabilitiesTests.cs
View file

@ -15,7 +15,11 @@ public static class ServerCapabilitiesTests
Resources = new ResourcesCapability { Subscribe = true, ListChanged = true },
Tools = new ToolsCapability { ListChanged = false },
Completions = new CompletionsCapability(),
Tasks = new McpTasksCapability()
Tasks = new McpTasksCapability(),
Extensions = new Dictionary<string, object>
{
["io.modelcontextprotocol/apps"] = new object()
}
};
string json = JsonSerializer.Serialize(original, McpJsonUtilities.DefaultOptions);
@ -32,6 +36,8 @@ public static class ServerCapabilitiesTests
Assert.False(deserialized.Tools.ListChanged);
Assert.NotNull(deserialized.Completions);
Assert.NotNull(deserialized.Tasks);
Assert.NotNull(deserialized.Extensions);
Assert.True(deserialized.Extensions.ContainsKey("io.modelcontextprotocol/apps"));
}
[Fact]
@ -50,5 +56,42 @@ public static class ServerCapabilitiesTests
Assert.Null(deserialized.Tools);
Assert.Null(deserialized.Completions);
Assert.Null(deserialized.Tasks);
Assert.Null(deserialized.Extensions);
}
[Fact]
public static void ServerCapabilities_Extensions_DeserializesFromJson()
{
string json = """
{
"extensions": {
"io.modelcontextprotocol/apps": {},
"io.modelcontextprotocol/custom": {
"option": 42,
"enabled": true
}
}
}
""";
var deserialized = JsonSerializer.Deserialize<ServerCapabilities>(json, McpJsonUtilities.DefaultOptions);
Assert.NotNull(deserialized);
Assert.NotNull(deserialized.Extensions);
Assert.Equal(2, deserialized.Extensions.Count);
Assert.True(deserialized.Extensions.ContainsKey("io.modelcontextprotocol/apps"));
Assert.True(deserialized.Extensions.ContainsKey("io.modelcontextprotocol/custom"));
}
[Fact]
public static void ServerCapabilities_Extensions_EmptyObjectDeserializesAsEmptyDictionary()
{
string json = """{"extensions": {}}""";
var deserialized = JsonSerializer.Deserialize<ServerCapabilities>(json, McpJsonUtilities.DefaultOptions);
Assert.NotNull(deserialized);
Assert.NotNull(deserialized.Extensions);
Assert.Empty(deserialized.Extensions);
}
}