React to CLI update and Anthropic response format changes (github#27)

* E2E infrastructure: skip writing snapshots on failure + update snapshots for extended thinking

* Update CLI to 0.0.383

* Regenerate types for session.usage_info and apply PR feedback

Author: SteveSandersonMS

dotnet/src/Generated/SessionEvents.cs

@@ -6,7 +6,7 @@
 //
 // Generated from: @github/copilot/session-events.schema.json
 // Generated by: scripts/generate-session-types.ts
-// Generated at: 2026-01-15T19:22:26.479Z
+// Generated at: 2026-01-16T00:52:52.781Z
 //
 // To update these types:
 // 1. Update the schema in copilot-agent-runtime
@@ -39,6 +39,7 @@ internal class SessionEventConverter : JsonConverter<SessionEvent>
             ["session.model_change"] = typeof(SessionModelChangeEvent),
             ["session.handoff"] = typeof(SessionHandoffEvent),
             ["session.truncation"] = typeof(SessionTruncationEvent),
+            ["session.usage_info"] = typeof(SessionUsageInfoEvent),
             ["session.compaction_start"] = typeof(SessionCompactionStartEvent),
             ["session.compaction_complete"] = typeof(SessionCompactionCompleteEvent),
             ["user.message"] = typeof(UserMessageEvent),
@@ -209,6 +210,17 @@ public partial class SessionTruncationEvent : SessionEvent
         public SessionTruncationData Data { get; set; }
     }
 
+    /// <summary>
+    /// Event: session.usage_info
+    /// </summary>
+    public partial class SessionUsageInfoEvent : SessionEvent
+    {
+        public override string Type => "session.usage_info";
+
+        [JsonPropertyName("data")]
+        public SessionUsageInfoData Data { get; set; }
+    }
+
     /// <summary>
     /// Event: session.compaction_start
     /// </summary>
@@ -592,6 +604,18 @@ public partial class SessionTruncationData
         public string PerformedBy { get; set; }
     }
 
+    public partial class SessionUsageInfoData
+    {
+        [JsonPropertyName("tokenLimit")]
+        public double TokenLimit { get; set; }
+
+        [JsonPropertyName("currentTokens")]
+        public double CurrentTokens { get; set; }
+
+        [JsonPropertyName("messagesLength")]
+        public double MessagesLength { get; set; }
+    }
+
     public partial class SessionCompactionStartData
     {
     }

dotnet/test/Harness/CapiProxy.cs

@@ -84,15 +84,16 @@ async Task<string> StartCoreAsync()
         }
     }
 
-    public async Task StopAsync()
+    public async Task StopAsync(bool skipWritingCache = false)
     {
         if (_startupTask != null)
         {
             try
             {
                 var url = await _startupTask;
+                var stopUrl = skipWritingCache ? $"{url}/stop?skipWritingCache=true" : $"{url}/stop";
                 using var client = new HttpClient();
-                await client.PostAsync($"{url}/stop", null);
+                await client.PostAsync(stopUrl, null);
             }
             catch { /* Best effort */ }
         }

dotnet/test/Harness/E2ETestContext.cs

@@ -101,7 +101,9 @@ public IReadOnlyDictionary<string, string> GetEnvironment()
 
     public async ValueTask DisposeAsync()
     {
-        await _proxy.DisposeAsync();
+        // Skip writing snapshots in CI to avoid corrupting them on test failures
+        var isCI = !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("CI"));
+        await _proxy.StopAsync(skipWritingCache: isCI);
 
         try { if (Directory.Exists(HomeDir)) Directory.Delete(HomeDir, true); } catch { }
         try { if (Directory.Exists(WorkDir)) Directory.Delete(WorkDir, true); } catch { }

go/e2e/permissions_test.go

@@ -99,7 +99,7 @@ func TestPermissions(t *testing.T) {
 		}
 
 		_, err = session.Send(copilot.MessageOptions{
-			Prompt: "Run 'echo hello world' and tell me the output",
+			Prompt: "Run 'echo hello' and tell me the output",
 		})
 		if err != nil {
 			t.Fatalf("Failed to send message: %v", err)

go/e2e/testharness/context.go

@@ -82,7 +82,7 @@ func NewTestContext(t *testing.T) *TestContext {
 	}
 
 	t.Cleanup(func() {
-		ctx.Close()
+		ctx.Close(t.Failed())
 	})
 
 	return ctx
@@ -113,9 +113,9 @@ func (c *TestContext) ConfigureForTest(t *testing.T) {
 }
 
 // Close cleans up the test context resources.
-func (c *TestContext) Close() {
+func (c *TestContext) Close(testFailed bool) {
 	if c.proxy != nil {
-		c.proxy.Stop()
+		c.proxy.StopWithOptions(testFailed)
 	}
 	if c.HomeDir != "" {
 		os.RemoveAll(c.HomeDir)

go/e2e/testharness/proxy.go

@@ -75,6 +75,12 @@ func (p *CapiProxy) Start() (string, error) {
 
 // Stop gracefully shuts down the proxy server.
 func (p *CapiProxy) Stop() error {
+	return p.StopWithOptions(false)
+}
+
+// StopWithOptions gracefully shuts down the proxy server.
+// If skipWritingCache is true, the proxy won't write captured exchanges to disk.
+func (p *CapiProxy) StopWithOptions(skipWritingCache bool) error {
 	p.mu.Lock()
 	defer p.mu.Unlock()
 
@@ -84,8 +90,12 @@ func (p *CapiProxy) Stop() error {
 
 	// Send stop request to the server
 	if p.proxyURL != "" {
+		stopURL := p.proxyURL + "/stop"
+		if skipWritingCache {
+			stopURL += "?skipWritingCache=true"
+		}
 		// Best effort - ignore errors
-		resp, err := http.Post(p.proxyURL+"/stop", "application/json", nil)
+		resp, err := http.Post(stopURL, "application/json", nil)
 		if err == nil {
 			resp.Body.Close()
 		}

go/generated/session_events.go

@@ -40,7 +40,7 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@github/copilot": "^0.0.382",
+    "@github/copilot": "^0.0.383",
     "vscode-jsonrpc": "^8.2.1",
     "zod": "^4.3.5"
   },

nodejs/package-lock.json

@@ -3,7 +3,7 @@
  *
  * Generated from: @github/copilot/session-events.schema.json
  * Generated by: scripts/generate-session-types.ts
- * Generated at: 2026-01-15T19:22:25.859Z
+ * Generated at: 2026-01-16T00:52:51.450Z
  *
  * To update these types:
  * 1. Update the schema in copilot-agent-runtime
@@ -115,6 +115,18 @@ export type SessionEvent =
         performedBy: string;
       };
     }
+  | {
+      id: string;
+      timestamp: string;
+      parentId: string | null;
+      ephemeral: true;
+      type: "session.usage_info";
+      data: {
+        tokenLimit: number;
+        currentTokens: number;
+        messagesLength: number;
+      };
+    }
   | {
       id: string;
       timestamp: string;