diff --git a/extensions/codex/src/app-server/compact.test.ts b/extensions/codex/src/app-server/compact.test.ts
index fd5699ba9e73..cff6517f7c96 100644
--- a/extensions/codex/src/app-server/compact.test.ts
+++ b/extensions/codex/src/app-server/compact.test.ts
@@ -1712,6 +1712,71 @@ describe("maybeCompactCodexAppServerSession", () => {
     warn.mockRestore();
   });
 
+  it("bounds ignored compaction override warnings through the compact entry point", async () => {
+    const warn = vi.spyOn(embeddedAgentLog, "warn").mockImplementation(() => undefined);
+    const info = vi.spyOn(embeddedAgentLog, "info").mockImplementation(() => undefined);
+
+    async function runWithIgnoredOverrides(index: number): Promise<void> {
+      const agentId = `cap-${index}`;
+      await maybeCompactCodexAppServerSession({
+        sessionId: `session-${index}`,
+        sessionKey: `agent:${agentId}:session-${index}`,
+        sessionFile: path.join(tempDir, `${agentId}.jsonl`),
+        workspaceDir: tempDir,
+        trigger: "budget",
+        config: {
+          agents: {
+            list: [
+              {
+                id: agentId,
+                compaction: {
+                  model: "openai/gpt-5.4-mini",
+                  provider: "custom-summary",
+                },
+              },
+            ],
+          },
+        },
+      });
+    }
+
+    // Fill exactly the advertised 4,096-entry cap: every distinct key warns once.
+    for (let index = 0; index < 4_096; index += 1) {
+      await runWithIgnoredOverrides(index);
+    }
+    expect(warn).toHaveBeenCalledTimes(4_096);
+
+    // At exactly 4,096 entries the oldest key is still retained, so a duplicate stays suppressed.
+    await runWithIgnoredOverrides(0);
+    expect(warn).toHaveBeenCalledTimes(4_096);
+
+    // The 4,097th distinct key pushes past the cap and evicts the LRU entry. The duplicate
+    // check on key 0 refreshed its recency, so the evicted key is 1.
+    await runWithIgnoredOverrides(4_096);
+    expect(warn).toHaveBeenCalledTimes(4_097);
+
+    // The evicted key warns again on reappearance.
+    await runWithIgnoredOverrides(1);
+    expect(warn).toHaveBeenCalledTimes(4_098);
+
+    // A recent duplicate stays suppressed.
+    await runWithIgnoredOverrides(4_096);
+    expect(warn).toHaveBeenCalledTimes(4_098);
+    expect(warn.mock.calls.at(-1)).toEqual([
+      "ignoring OpenClaw compaction overrides for Codex app-server compaction; Codex uses native server-side compaction",
+      {
+        sessionId: "session-1",
+        sessionKey: "agent:cap-1:session-1",
+        ignoredConfig: [
+          "agents.list.cap-1.compaction.model",
+          "agents.list.cap-1.compaction.provider",
+        ],
+      },
+    ]);
+    info.mockRestore();
+    warn.mockRestore();
+  });
+
   it("warns when active agent compaction overrides are ignored", async () => {
     const warn = vi.spyOn(embeddedAgentLog, "warn").mockImplementation(() => undefined);
     const fake = createFakeCodexClient();
diff --git a/extensions/codex/src/app-server/compact.ts b/extensions/codex/src/app-server/compact.ts
index 3ecb41eadb9a..92f9da96c290 100644
--- a/extensions/codex/src/app-server/compact.ts
+++ b/extensions/codex/src/app-server/compact.ts
@@ -8,6 +8,7 @@ import {
   type EmbeddedAgentCompactResult,
 } from "openclaw/plugin-sdk/agent-harness-runtime";
 import { resolveAgentDir, resolveDefaultAgentId } from "openclaw/plugin-sdk/agent-runtime";
+import { createDedupeCache } from "openclaw/plugin-sdk/dedupe-runtime";
 import { KeyedAsyncQueue } from "openclaw/plugin-sdk/keyed-async-queue";
 import { asOptionalRecord } from "openclaw/plugin-sdk/string-coerce-runtime";
 import { isIncognitoSessionKey } from "../incognito-session.js";
@@ -42,7 +43,9 @@ import {
 } from "./shared-client.js";
 import { resumeCodexAppServerThread } from "./thread-resume.js";
 
-const warnedIgnoredCompactionOverrides = new Set<string>();
+// ttlMs: 0 retains keys until the 4,096-entry LRU cap evicts them, after which a
+// previously suppressed warning can intentionally emit again.
+const warnedIgnoredCompactionOverrides = createDedupeCache({ ttlMs: 0, maxSize: 4096 });
 const codexNativeCompactionQueue = new KeyedAsyncQueue();
 const CODEX_NATIVE_COMPACTION_INTERRUPT_GRACE_MS = 30_000;
 type CodexAppServerCompactOptions = {
@@ -350,10 +353,9 @@ function warnIfIgnoringOpenClawCompactionOverrides(
     return;
   }
   const warningKey = ignoredConfig.join("\0");
-  if (warnedIgnoredCompactionOverrides.has(warningKey)) {
+  if (warnedIgnoredCompactionOverrides.check(warningKey)) {
     return;
   }
-  warnedIgnoredCompactionOverrides.add(warningKey);
   embeddedAgentLog.warn(
     "ignoring OpenClaw compaction overrides for Codex app-server compaction; Codex uses native server-side compaction",
     {