diff --git a/src/agents/pi-embedded-runner.sanitize-session-history.test.ts b/src/agents/pi-embedded-runner.sanitize-session-history.test.ts
index 6ee05837bfc..d8efba99a22 100644
--- a/src/agents/pi-embedded-runner.sanitize-session-history.test.ts
+++ b/src/agents/pi-embedded-runner.sanitize-session-history.test.ts
@@ -76,7 +76,7 @@ describe("sanitizeSessionHistory", () => {
     );
   });
 
-  it("does not sanitize tool call ids for non-Google APIs", async () => {
+  it("sanitizes tool call ids for Anthropic APIs", async () => {
     vi.mocked(helpers.isGoogleModelApi).mockReturnValue(false);
 
     await sanitizeSessionHistory({
@@ -90,7 +90,7 @@ describe("sanitizeSessionHistory", () => {
     expect(helpers.sanitizeSessionMessagesImages).toHaveBeenCalledWith(
       mockMessages,
       "session:history",
-      expect.objectContaining({ sanitizeMode: "full", sanitizeToolCallIds: false }),
+      expect.objectContaining({ sanitizeMode: "full", sanitizeToolCallIds: true }),
     );
   });
 
diff --git a/src/agents/transcript-policy.test.ts b/src/agents/transcript-policy.test.ts
new file mode 100644
index 00000000000..48977ec98fe
--- /dev/null
+++ b/src/agents/transcript-policy.test.ts
@@ -0,0 +1,41 @@
+import { describe, expect, it } from "vitest";
+import { resolveTranscriptPolicy } from "./transcript-policy.js";
+
+describe("resolveTranscriptPolicy", () => {
+  it("enables sanitizeToolCallIds for Anthropic provider", () => {
+    const policy = resolveTranscriptPolicy({
+      provider: "anthropic",
+      modelId: "claude-opus-4-5",
+      modelApi: "anthropic-messages",
+    });
+    expect(policy.sanitizeToolCallIds).toBe(true);
+    expect(policy.toolCallIdMode).toBe("strict");
+  });
+
+  it("enables sanitizeToolCallIds for Google provider", () => {
+    const policy = resolveTranscriptPolicy({
+      provider: "google",
+      modelId: "gemini-2.0-flash",
+      modelApi: "google-generative-ai",
+    });
+    expect(policy.sanitizeToolCallIds).toBe(true);
+  });
+
+  it("enables sanitizeToolCallIds for Mistral provider", () => {
+    const policy = resolveTranscriptPolicy({
+      provider: "mistral",
+      modelId: "mistral-large-latest",
+    });
+    expect(policy.sanitizeToolCallIds).toBe(true);
+    expect(policy.toolCallIdMode).toBe("strict9");
+  });
+
+  it("disables sanitizeToolCallIds for OpenAI provider", () => {
+    const policy = resolveTranscriptPolicy({
+      provider: "openai",
+      modelId: "gpt-4o",
+      modelApi: "openai",
+    });
+    expect(policy.sanitizeToolCallIds).toBe(false);
+  });
+});
diff --git a/src/agents/transcript-policy.ts b/src/agents/transcript-policy.ts
index 6d74c3832b7..22e173320b5 100644
--- a/src/agents/transcript-policy.ts
+++ b/src/agents/transcript-policy.ts
@@ -95,7 +95,7 @@ export function resolveTranscriptPolicy(params: {
 
   const needsNonImageSanitize = isGoogle || isAnthropic || isMistral || isOpenRouterGemini;
 
-  const sanitizeToolCallIds = isGoogle || isMistral;
+  const sanitizeToolCallIds = isGoogle || isMistral || isAnthropic;
   const toolCallIdMode: ToolCallIdMode | undefined = isMistral
     ? "strict9"
     : sanitizeToolCallIds