diff --git a/scripts/lib/ci-node-test-plan.mjs b/scripts/lib/ci-node-test-plan.mjs
index 5a789c85610e..926f515170d5 100644
--- a/scripts/lib/ci-node-test-plan.mjs
+++ b/scripts/lib/ci-node-test-plan.mjs
@@ -30,6 +30,11 @@ const GATEWAY_STARTUP_CORE_RUNNER = DEFAULT_NODE_TEST_RUNNER;
 const GATEWAY_STARTUP_HEALTH_RUNTIME_ENV = {
   OPENCLAW_VITEST_NO_OUTPUT_TIMEOUT_MS: "60000",
 };
+// The first embedded-agent file owns 157 serial tests and can stay quiet for
+// more than five minutes on a cold GitHub-hosted 4-vCPU fork runner.
+const AGENTS_EMBEDDED_AGENT_ENV = {
+  OPENCLAW_VITEST_NO_OUTPUT_TIMEOUT_MS: "420000",
+};
 const MAX_BUNDLED_NODE_TEST_PATTERNS = 64;
 // PR-only bundles trade a little serial work for fewer ephemeral runner registrations.
 // Keep runner classes and subprocess isolation intact while bounding each combined job.
@@ -71,7 +76,9 @@ const COMPACT_GROUP_SECONDS_HINTS = new Map([
   ["agentic-agents-core-runtime", 79],
   ["agentic-agents-core-subagents", 32],
   ["agentic-agents-core-tools", 52],
-  ["agentic-agents-embedded", 57],
+  // A cold fork run is about 430s and emits no file result for most of its
+  // first five minutes. Keep this whole-config whale in its own compact job.
+  ["agentic-agents-embedded", 430],
   ["agentic-agents-support", 105],
   ["agentic-agents-tools", 42],
   ["agentic-cli", 72],
@@ -1183,6 +1190,7 @@ const SPLIT_NODE_SHARDS = new Map([
       {
         shardName: "agentic-agents-embedded",
         configs: ["test/vitest/vitest.agents-embedded-agent.config.ts"],
+        env: AGENTS_EMBEDDED_AGENT_ENV,
         requiresDist: false,
       },
       {
diff --git a/src/agents/embedded-agent-runner/run.incomplete-turn.test.ts b/src/agents/embedded-agent-runner/run.incomplete-turn.test.ts
index 949046af360f..b6897a3a3774 100644
--- a/src/agents/embedded-agent-runner/run.incomplete-turn.test.ts
+++ b/src/agents/embedded-agent-runner/run.incomplete-turn.test.ts
@@ -50,6 +50,10 @@ const SETTLED_TOOL_TERMINAL_CONTINUATION_INSTRUCTION =
 
 let runEmbeddedAgent: typeof import("./run.js").runEmbeddedAgent;
 
+// Cold GitHub-hosted fork runners can spend more than five minutes loading and
+// warming this broad harness before the first test reports progress.
+const COLD_FORK_RUNNER_HOOK_TIMEOUT_MS = 420_000;
+
 function resolveIncompleteTurnPayloadText(
   params: Omit<Parameters<typeof resolveIncompleteTurnPayloadTextCore>[0], "externalAbort"> & {
     externalAbort?: boolean;
@@ -64,7 +68,7 @@ describe("runEmbeddedAgent incomplete-turn safety", () => {
   beforeAll(async () => {
     ({ runEmbeddedAgent } = await loadRunOverflowCompactionHarness());
     await warmRunOverflowCompactionHarness(runEmbeddedAgent);
-  }, 300_000);
+  }, COLD_FORK_RUNNER_HOOK_TIMEOUT_MS);
 
   beforeEach(() => {
     resetRunOverflowCompactionHarnessMocks();
diff --git a/test/scripts/ci-node-test-plan.test.ts b/test/scripts/ci-node-test-plan.test.ts
index d83e7820b799..354c5df2613a 100644
--- a/test/scripts/ci-node-test-plan.test.ts
+++ b/test/scripts/ci-node-test-plan.test.ts
@@ -299,6 +299,13 @@ describe("scripts/lib/ci-node-test-plan.mjs", () => {
         .flatMap((shard) => shard.groups)
         .find((group) => group.shard_name === "agentic-control-plane-startup-health-runtime")?.env,
     ).toEqual({ OPENCLAW_VITEST_NO_OUTPUT_TIMEOUT_MS: "60000" });
+    const embeddedAgentJob = compact.find((shard) =>
+      shard.groups.some((group) => group.shard_name === "agentic-agents-embedded"),
+    );
+    expect(embeddedAgentJob?.groups).toHaveLength(1);
+    expect(embeddedAgentJob?.groups[0]?.env).toEqual({
+      OPENCLAW_VITEST_NO_OUTPUT_TIMEOUT_MS: "420000",
+    });
     expect(
       compact
         .filter((shard) => shard.groups.some((group) => !group.includePatterns))
@@ -997,6 +1004,7 @@ describe("scripts/lib/ci-node-test-plan.mjs", () => {
       {
         checkName: "checks-node-agentic-agents-embedded",
         configs: ["test/vitest/vitest.agents-embedded-agent.config.ts"],
+        env: { OPENCLAW_VITEST_NO_OUTPUT_TIMEOUT_MS: "420000" },
         requiresDist: false,
         runner: DEFAULT_NODE_TEST_RUNNER,
         shardName: "agentic-agents-embedded",