diff --git a/packages/server/src/server/agent/agent-manager.test.ts b/packages/server/src/server/agent/agent-manager.test.ts
index 37290369f..4e1398f76 100644
--- a/packages/server/src/server/agent/agent-manager.test.ts
+++ b/packages/server/src/server/agent/agent-manager.test.ts
@@ -1741,10 +1741,6 @@ test("hydrateTimeline preserves assistant chunk, reasoning, and tool timeline hi
   const storage = new AgentStorage(storagePath, logger);
 
   class ChunkedAssistantHistorySession extends TestAgentSession {
-    constructor(config: AgentSessionConfig) {
-      super(config);
-    }
-
     async *streamHistory(): AsyncGenerator<AgentStreamEvent> {
       yield {
         type: "timeline",
@@ -1846,10 +1842,6 @@ test("hydrateTimeline preserves reasoning between assistant chunks", async () =>
   const storage = new AgentStorage(storagePath, logger);
 
   class ReasoningInterleavedHistorySession extends TestAgentSession {
-    constructor(config: AgentSessionConfig) {
-      super(config);
-    }
-
     async *streamHistory(): AsyncGenerator<AgentStreamEvent> {
       yield {
         type: "timeline",
@@ -4101,10 +4093,6 @@ test("hydrateTimeline skips provider user_message items to prevent duplicates wi
   // Session whose streamHistory yields user_message + assistant_message items.
   // This simulates Codex provider replaying its thread history on resume.
   class HistoryWithUserMessagesSession extends TestAgentSession {
-    constructor(config: AgentSessionConfig) {
-      super(config);
-    }
-
     async *streamHistory(): AsyncGenerator<AgentStreamEvent> {
       yield {
         type: "timeline",
@@ -4196,10 +4184,6 @@ test("hydrateTimeline keeps provider user_message items when no canonical user h
   const storage = new AgentStorage(storagePath, logger);
 
   class HistoryWithUserMessagesSession extends TestAgentSession {
-    constructor(config: AgentSessionConfig) {
-      super(config);
-    }
-
     async *streamHistory(): AsyncGenerator<AgentStreamEvent> {
       yield {
         type: "timeline",
@@ -4270,10 +4254,6 @@ test("hydrateTimeline suppresses only matching canonical user_message messageId"
   const storage = new AgentStorage(storagePath, logger);
 
   class HistoryWithMixedUserMessagesSession extends TestAgentSession {
-    constructor(config: AgentSessionConfig) {
-      super(config);
-    }
-
     async *streamHistory(): AsyncGenerator<AgentStreamEvent> {
       yield {
         type: "timeline",
@@ -4446,10 +4426,6 @@ test("live provider user_message echo is suppressed when recordUserMessage was c
 
   // Session whose live turn echoes the user message (as Claude does)
   class EchoUserMessageSession extends TestAgentSession {
-    constructor(config: AgentSessionConfig) {
-      super(config);
-    }
-
     override async startTurn(): Promise<{ turnId: string }> {
       const turnId = "turn-echo-1";
       setTimeout(() => {
@@ -4529,10 +4505,6 @@ test("live provider user_message with different messageId is NOT suppressed", as
   const storage = new AgentStorage(storagePath, logger);
 
   class DifferentMessageIdSession extends TestAgentSession {
-    constructor(config: AgentSessionConfig) {
-      super(config);
-    }
-
     override async startTurn(): Promise<{ turnId: string }> {
       const turnId = "turn-diff-msgid-1";
       setTimeout(() => {
@@ -4600,10 +4572,6 @@ test("live provider user_message without messageId is NOT suppressed", async ()
   const storage = new AgentStorage(storagePath, logger);
 
   class NoMessageIdSession extends TestAgentSession {
-    constructor(config: AgentSessionConfig) {
-      super(config);
-    }
-
     override async startTurn(): Promise<{ turnId: string }> {
       const turnId = "turn-no-msgid-1";
       setTimeout(() => {
@@ -4661,10 +4629,6 @@ test("provider user_message is NOT suppressed when no prior recordUserMessage",
 
   // Session whose live turn yields a user_message without prior canonical recording
   class UnexpectedUserMessageSession extends TestAgentSession {
-    constructor(config: AgentSessionConfig) {
-      super(config);
-    }
-
     override async startTurn(): Promise<{ turnId: string }> {
       const turnId = "turn-unexpected-1";
       setTimeout(() => {
diff --git a/packages/server/src/server/websocket-server.notifications.test.ts b/packages/server/src/server/websocket-server.notifications.test.ts
index e0145d3e4..ee31abc44 100644
--- a/packages/server/src/server/websocket-server.notifications.test.ts
+++ b/packages/server/src/server/websocket-server.notifications.test.ts
@@ -29,7 +29,9 @@ vi.mock("ws", () => ({
 }));
 
 vi.mock("./session.js", () => ({
-  Session: class {},
+  Session: function Session() {
+    return {};
+  },
 }));
 
 vi.mock("./push/token-store.js", () => ({
diff --git a/packages/server/src/server/websocket-server.runtime-metrics.test.ts b/packages/server/src/server/websocket-server.runtime-metrics.test.ts
index e49c5d3a1..6d0eb30d2 100644
--- a/packages/server/src/server/websocket-server.runtime-metrics.test.ts
+++ b/packages/server/src/server/websocket-server.runtime-metrics.test.ts
@@ -6,8 +6,6 @@ const wsModuleMock = vi.hoisted(() => {
   class MockWebSocketServer {
     readonly handlers = new Map<string, (...args: any[]) => void>();
 
-    constructor(_options: unknown) {}
-
     on(event: string, handler: (...args: any[]) => void) {
       this.handlers.set(event, handler);
       return this;