diff --git a/src/main/runtime/orca-runtime-tests/terminal-creation-and-readiness-part-07.spec.ts b/src/main/runtime/orca-runtime-tests/terminal-creation-and-readiness-part-07.spec.ts
index 3ae648ab0ef..5e1de184c9c 100644
--- a/src/main/runtime/orca-runtime-tests/terminal-creation-and-readiness-part-07.spec.ts
+++ b/src/main/runtime/orca-runtime-tests/terminal-creation-and-readiness-part-07.spec.ts
@@ -3,7 +3,7 @@ import {
   AGENT_PROMPT_BRACKETED_PASTE_END,
   AGENT_PROMPT_BRACKETED_PASTE_START,
   buildAgentPromptPasteBytes,
-  getAgentPromptSubmitDelayMs
+  resolveAgentPromptSubmitDelayForAgent
 } from '../../../shared/agent-prompt-injection'
 import { TUI_AGENT_CONFIG } from '../../../shared/tui-agent-config'
 import type { TuiAgent } from '../../../shared/tui-agent'
@@ -610,9 +610,13 @@ describe('OrcaRuntimeService', () => {
         launchAgent: agent
       })
 
-      const submitDelayMs = getAgentPromptSubmitDelayMs(
+      // The agent's own policy, not the byte-only delay: antigravity adds a per-line settle
+      // (#21665), and advancing fake timers by less than the policy waits leaves the submit
+      // pending until the real 30 s timeout.
+      const submitDelayMs = resolveAgentPromptSubmitDelayForAgent(
         process.platform,
-        Buffer.byteLength(buildAgentPromptPasteBytes('review this change'), 'utf8')
+        'review this change',
+        agent
       )
       const sendPromise = runtime.sendTerminalAgentPrompt(handle, 'review this change')
       if (agent === 'omp') {