diff --git a/CHANGELOG.md b/CHANGELOG.md
index 32cb0ee7bdd..407c1e72b18 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Agents/tool-result guard: use the resolved runtime context token budget for non-context-engine tool-result overflow checks, so long tool-heavy sessions no longer compact early when `contextTokens` is larger than native `contextWindow`. Fixes #74917. Thanks @kAIborg24.
 - Gateway/systemd: exit with sysexits 78 for supervised lock and `EADDRINUSE` conflicts so `RestartPreventExitStatus=78` stops `Restart=always` restart loops instead of repeatedly reloading plugins against an occupied port. Fixes #75115. Thanks @yhyatt.
 - Plugins/runtime-deps: replace stale symlinked mirror target roots before writing runtime-mirror temp files and skip rewriting already materialized hardlinks, so cross-version container upgrades no longer crash-loop on read-only image-layer paths while warm mirrors do less churn. Fixes #75108; refs #75069. Thanks @coletebou and @xiaohuaxi.
 - Auto-reply/group chats: fall back to automatic source delivery when a channel precomputes message-tool-only replies but the `message` tool is unavailable, so Discord/Slack-style group turns do not silently complete without a visible reply. Fixes #74868. Thanks @kagura-agent.
diff --git a/src/agents/pi-embedded-runner/run/attempt.spawn-workspace.context-engine.test.ts b/src/agents/pi-embedded-runner/run/attempt.spawn-workspace.context-engine.test.ts
index f0a799906a9..710a7aae4f7 100644
--- a/src/agents/pi-embedded-runner/run/attempt.spawn-workspace.context-engine.test.ts
+++ b/src/agents/pi-embedded-runner/run/attempt.spawn-workspace.context-engine.test.ts
@@ -869,3 +869,43 @@ describe("runEmbeddedAttempt context engine mid-turn precheck integration", () =
     expect(result.messagesSnapshot).toEqual([seedMessage]);
   });
 });
+
+describe("runEmbeddedAttempt tool-result guard budget wiring", () => {
+  const sessionKey = "agent:main:guildchat:channel:tool-result-guard-budget";
+  const tempPaths: string[] = [];
+
+  beforeEach(() => {
+    resetEmbeddedAttemptHarness();
+    clearMemoryPluginState();
+  });
+
+  afterEach(async () => {
+    await cleanupTempPaths(tempPaths);
+    clearMemoryPluginState();
+    vi.restoreAllMocks();
+  });
+
+  it("uses the resolved contextTokenBudget before model contextWindow", async () => {
+    await createContextEngineAttemptRunner({
+      contextEngine: createContextEngineBootstrapAndAssemble(),
+      sessionKey,
+      tempPaths,
+      attemptOverrides: {
+        contextTokenBudget: 1_000_000,
+        model: {
+          api: "openai-completions",
+          provider: "openai",
+          compat: {},
+          contextWindow: 200_000,
+          input: ["text"],
+        } as never,
+      },
+    });
+
+    expect(hoisted.installToolResultContextGuardMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        contextWindowTokens: 1_000_000,
+      }),
+    );
+  });
+});
diff --git a/src/agents/pi-embedded-runner/run/attempt.ts b/src/agents/pi-embedded-runner/run/attempt.ts
index a0e133c3a28..b203e901e14 100644
--- a/src/agents/pi-embedded-runner/run/attempt.ts
+++ b/src/agents/pi-embedded-runner/run/attempt.ts
@@ -1528,7 +1528,12 @@ export async function runEmbeddedAttempt(
       };
       const contextTokenBudgetForGuard = Math.max(
         1,
-        Math.floor(params.contextTokenBudget ?? DEFAULT_CONTEXT_TOKENS),
+        Math.floor(
+          params.contextTokenBudget ??
+            params.model.contextWindow ??
+            params.model.maxTokens ??
+            DEFAULT_CONTEXT_TOKENS,
+        ),
       );
       const toolResultMaxCharsForGuard = resolveLiveToolResultMaxChars({
         contextWindowTokens: contextTokenBudgetForGuard,
@@ -1544,12 +1549,7 @@ export async function runEmbeddedAttempt(
       if (!activeContextEngine || activeContextEngine.info.ownsCompaction !== true) {
         removeToolResultContextGuard = installToolResultContextGuard({
           agent: activeSession.agent,
-          contextWindowTokens: Math.max(
-            1,
-            Math.floor(
-              params.model.contextWindow ?? params.model.maxTokens ?? DEFAULT_CONTEXT_TOKENS,
-            ),
-          ),
+          contextWindowTokens: contextTokenBudgetForGuard,
           ...(midTurnPrecheckEnabled
             ? {
                 midTurnPrecheck: {