diff --git a/src/hooks/tool-output-truncator.test.ts b/src/hooks/tool-output-truncator.test.ts
index e38a1c70e..d1d1d573e 100644
--- a/src/hooks/tool-output-truncator.test.ts
+++ b/src/hooks/tool-output-truncator.test.ts
@@ -19,6 +19,20 @@ describe("createToolOutputTruncatorHook", () => {
     hook = createToolOutputTruncatorHook({} as never)
   })
 
+  it("passes modelContextLimitsCache through to createDynamicTruncator", () => {
+    const ctx = {} as never
+    const modelContextLimitsCache = new Map<string, number>()
+    const modelCacheState = {
+      anthropicContext1MEnabled: false,
+      modelContextLimitsCache,
+    }
+
+    truncateSpy.mockClear()
+    createToolOutputTruncatorHook(ctx, { modelCacheState })
+
+    expect(truncateSpy).toHaveBeenLastCalledWith(ctx, modelCacheState)
+  })
+
   describe("tool.execute.after", () => {
     const createInput = (tool: string) => ({
       tool,
diff --git a/src/hooks/tool-output-truncator.ts b/src/hooks/tool-output-truncator.ts
index f47bf199b..c62ab23b5 100644
--- a/src/hooks/tool-output-truncator.ts
+++ b/src/hooks/tool-output-truncator.ts
@@ -27,7 +27,10 @@ const TOOL_SPECIFIC_MAX_TOKENS: Record<string, number> = {
 }
 
 interface ToolOutputTruncatorOptions {
-  modelCacheState?: { anthropicContext1MEnabled: boolean }
+  modelCacheState?: {
+    anthropicContext1MEnabled: boolean
+    modelContextLimitsCache?: Map<string, number>
+  }
   experimental?: ExperimentalConfig
 }