diff --git a/src/hooks/anthropic-context-window-limit-recovery/recovery-deduplication.test.ts b/src/hooks/anthropic-context-window-limit-recovery/recovery-deduplication.test.ts
index 2b82051af..2e8772776 100644
--- a/src/hooks/anthropic-context-window-limit-recovery/recovery-deduplication.test.ts
+++ b/src/hooks/anthropic-context-window-limit-recovery/recovery-deduplication.test.ts
@@ -1,9 +1,12 @@
-import { describe, test, expect, mock } from "bun:test"
+import { describe, test, expect, mock, beforeEach } from "bun:test"
 import type { PluginInput } from "@opencode-ai/plugin"
 import type { ExperimentalConfig } from "../../config"
-import { mkdtempSync, mkdirSync, rmSync, writeFileSync, readFileSync } from "node:fs"
-import { join } from "node:path"
-import { tmpdir } from "node:os"
+
+const attemptDeduplicationRecoveryMock = mock(async () => {})
+
+mock.module("./deduplication-recovery", () => ({
+  attemptDeduplicationRecovery: attemptDeduplicationRecoveryMock,
+}))
 
 function createImmediateTimeouts(): () => void {
   const originalSetTimeout = globalThis.setTimeout
@@ -22,75 +25,14 @@ function createImmediateTimeouts(): () => void {
   }
 }
 
-function writeJson(filePath: string, data: unknown): void {
-  writeFileSync(filePath, JSON.stringify(data, null, 2))
-}
-
 describe("createAnthropicContextWindowLimitRecoveryHook", () => {
-  test("attempts deduplication recovery when compaction hits prompt too long errors", async () => {
+  beforeEach(() => {
+    attemptDeduplicationRecoveryMock.mockClear()
+  })
+
+  test("calls deduplication recovery when compaction is already in progress", async () => {
+    //#given
     const restoreTimeouts = createImmediateTimeouts()
-    const originalDataHome = process.env.XDG_DATA_HOME
-    const tempHome = mkdtempSync(join(tmpdir(), "omo-context-"))
-    process.env.XDG_DATA_HOME = tempHome
-
-    const storageRoot = join(tempHome, "opencode", "storage")
-    const messageDir = join(storageRoot, "message", "session-96")
-    const partDir = join(storageRoot, "part", "message-1")
-    const partDirTwo = join(storageRoot, "part", "message-2")
-
-    mkdirSync(messageDir, { recursive: true })
-    mkdirSync(partDir, { recursive: true })
-    mkdirSync(partDirTwo, { recursive: true })
-
-    writeJson(join(messageDir, "message-1.json"), {
-      parts: [
-        {
-          type: "tool",
-          callID: "call-1",
-          tool: "read",
-          state: { input: { filePath: "/tmp/a.txt" } },
-        },
-      ],
-    })
-
-    writeJson(join(messageDir, "message-2.json"), {
-      parts: [
-        {
-          type: "tool",
-          callID: "call-2",
-          tool: "read",
-          state: { input: { filePath: "/tmp/a.txt" } },
-        },
-      ],
-    })
-
-    writeJson(join(partDir, "part-1.json"), {
-      id: "part-1",
-      sessionID: "session-96",
-      messageID: "message-1",
-      type: "tool",
-      callID: "call-1",
-      tool: "read",
-      state: {
-        status: "completed",
-        input: { filePath: "/tmp/a.txt" },
-        output: "duplicate output",
-      },
-    })
-
-    writeJson(join(partDirTwo, "part-2.json"), {
-      id: "part-2",
-      sessionID: "session-96",
-      messageID: "message-2",
-      type: "tool",
-      callID: "call-2",
-      tool: "read",
-      state: {
-        status: "completed",
-        input: { filePath: "/tmp/a.txt" },
-        output: "latest output",
-      },
-    })
 
     const experimental = {
       dynamic_context_pruning: {
@@ -123,7 +65,7 @@ describe("createAnthropicContextWindowLimitRecoveryHook", () => {
       const ctx = { client: mockClient, directory: "/tmp" } as PluginInput
       const hook = createAnthropicContextWindowLimitRecoveryHook(ctx, { experimental })
 
-      // given - initial token limit error schedules compaction
+      // first error triggers compaction (setTimeout runs immediately due to mock)
       await hook.event({
         event: {
           type: "session.error",
@@ -131,7 +73,7 @@ describe("createAnthropicContextWindowLimitRecoveryHook", () => {
         },
       })
 
-      // when - compaction hits another prompt-too-long error
+      //#when - second error while compaction is in progress
       await hook.event({
         event: {
           type: "session.error",
@@ -139,17 +81,42 @@ describe("createAnthropicContextWindowLimitRecoveryHook", () => {
         },
       })
 
-      // then - duplicate tool output is truncated
-      const prunedPart = JSON.parse(
-        readFileSync(join(partDir, "part-1.json"), "utf-8"),
-      ) as { truncated?: boolean }
-
-      expect(prunedPart.truncated).toBe(true)
+      //#then - deduplication recovery was called for the second error
+      expect(attemptDeduplicationRecoveryMock).toHaveBeenCalledTimes(1)
+      expect(attemptDeduplicationRecoveryMock.mock.calls[0]![0]).toBe("session-96")
     } finally {
       if (resolveSummarize) resolveSummarize()
       restoreTimeouts()
-      process.env.XDG_DATA_HOME = originalDataHome
-      rmSync(tempHome, { recursive: true, force: true })
     }
   })
+
+  test("does not call deduplication when compaction is not in progress", async () => {
+    //#given
+    const mockClient = {
+      session: {
+        messages: mock(() => Promise.resolve({ data: [] })),
+        summarize: mock(() => Promise.resolve()),
+        revert: mock(() => Promise.resolve()),
+        prompt_async: mock(() => Promise.resolve()),
+      },
+      tui: {
+        showToast: mock(() => Promise.resolve()),
+      },
+    }
+
+    const { createAnthropicContextWindowLimitRecoveryHook } = await import("./recovery-hook")
+    const ctx = { client: mockClient, directory: "/tmp" } as PluginInput
+    const hook = createAnthropicContextWindowLimitRecoveryHook(ctx)
+
+    //#when - single error (no compaction in progress)
+    await hook.event({
+      event: {
+        type: "session.error",
+        properties: { sessionID: "session-no-dedup", error: "some other error" },
+      },
+    })
+
+    //#then
+    expect(attemptDeduplicationRecoveryMock).not.toHaveBeenCalled()
+  })
 })