diff --git a/packages/sdk/tests/fixtures/agent-environment-variables.yaml b/packages/sdk/tests/fixtures/agent-environment-variables.yaml
new file mode 100644
index 0000000..e1c9907
--- /dev/null
+++ b/packages/sdk/tests/fixtures/agent-environment-variables.yaml
@@ -0,0 +1,16 @@
+version: "1"
+
+providers:
+  qoder:
+    api_key: test-token
+
+defaults:
+  provider: qoder
+
+agents:
+  assistant:
+    model: auto
+    instructions: Test environment variable parsing.
+    environment_variables:
+      FEATURE_FLAG: "on"
+      RETRY_COUNT: "3"
diff --git a/packages/sdk/tests/unit/parser.test.ts b/packages/sdk/tests/unit/parser.test.ts
index b236aac..dae10ca 100644
--- a/packages/sdk/tests/unit/parser.test.ts
+++ b/packages/sdk/tests/unit/parser.test.ts
@@ -79,3 +79,12 @@ test("rejects environment setup scripts over 64 KiB by UTF-8 byte length", () =>
 	expect(result.success).toBe(false);
 	if (!result.success) expect(result.error.issues[0]?.message).toContain("65536 UTF-8 bytes");
 });
+
+test("preserves Agent environment variables from YAML", async () => {
+	const { config, errors } = await loadConfig(resolve(FIXTURES, "agent-environment-variables.yaml"));
+	expect(errors).toEqual([]);
+	expect(config.agents?.assistant?.environment_variables).toEqual({
+		FEATURE_FLAG: "on",
+		RETRY_COUNT: "3",
+	});
+});