diff --git a/src/google/adk/flows/llm_flows/instructions.py b/src/google/adk/flows/llm_flows/instructions.py
index 02af9dcaa..7d972c6e7 100644
--- a/src/google/adk/flows/llm_flows/instructions.py
+++ b/src/google/adk/flows/llm_flows/instructions.py
@@ -109,6 +109,10 @@ def _replace_match(match) -> str:
         else:
           raise KeyError(f'Context variable not found: `{var_name}`.')
 
+  def _replace_escaped(match) -> str:
+    return match.group().replace('{{', '{').replace('}}', '}')
+
+  instruction_template = re.sub(r'{{+[^{}]*}}+', _replace_escaped, instruction_template)
   return re.sub(r'{+[^{}]*}+', _replace_match, instruction_template)
 
 
diff --git a/src/google/adk/tests/integration/test_context_variable.py b/src/google/adk/tests/integration/test_context_variable.py
index ba6af06af..2a1dd2eeb 100644
--- a/src/google/adk/tests/integration/test_context_variable.py
+++ b/src/google/adk/tests/integration/test_context_variable.py
@@ -16,52 +16,66 @@
 
 import pytest
 
-# Skip until fixed.
-pytest.skip(allow_module_level=True)
-
 from .fixture import context_variable_agent
 from .utils import TestRunner
 
 
 @pytest.mark.parametrize(
     "agent_runner",
-    [{"agent": context_variable_agent.agent.state_variable_echo_agent}],
+    [{"agent": context_variable_agent.context_variable_echo_agent}],
     indirect=True,
 )
 def test_context_variable_missing(agent_runner: TestRunner):
-  with pytest.raises(KeyError) as e_info:
-    agent_runner.run("Hi echo my customer id.")
-  assert "customerId" in str(e_info.value)
+    with pytest.raises(KeyError) as e_info:
+        agent_runner.run("Hi echo my customer id.")
+    assert "customerId" in str(e_info.value)
 
 
 @pytest.mark.parametrize(
     "agent_runner",
-    [{"agent": context_variable_agent.agent.state_variable_update_agent}],
+    [{"agent": context_variable_agent.context_variable_update_agent}],
     indirect=True,
 )
 def test_context_variable_update(agent_runner: TestRunner):
-  _call_function_and_assert(
-      agent_runner,
-      "update_fc",
-      ["RRRR", "3.141529", ["apple", "banana"], [1, 3.14, "hello"]],
-      "successfully",
-  )
+    _call_function_and_assert(
+        agent_runner,
+        "update_fc",
+        ["RRRR", "3.141529", ["apple", "banana"], [1, 3.14, "hello"]],
+        "successfully",
+    )
+
+
+@pytest.mark.parametrize(
+    "agent_runner",
+    [{"agent": context_variable_agent.context_variable_with_complicated_format_agent}],
+    indirect=True,
+)
+def test_context_variable_with_complicated_format(agent_runner: TestRunner):
+    agent_runner.run("Hi echo my customer id.")
+    model_response_event = agent_runner.get_events()[-1]
+    assert model_response_event.author == "context_variable_with_complicated_format_agent"
+    assert model_response_event.content.role == "model"
+    assert "1234567890" in model_response_event.content.parts[0].text.strip()
+    assert "30" in model_response_event.content.parts[0].text.strip()
+    assert "{  non-identifier-float}}" in model_response_event.content.parts[0].text.strip()
+    assert "{'key1': 'value1'}" in model_response_event.content.parts[0].text.strip()
+    assert "{{'key2': 'value2'}}" in model_response_event.content.parts[0].text.strip()
 
 
 def _call_function_and_assert(
     agent_runner: TestRunner, function_name: str, params, expected
 ):
-  param_section = (
-      " with params"
-      f" {params if isinstance(params, str) else json.dumps(params)}"
-      if params is not None
-      else ""
-  )
-  agent_runner.run(
-      f"Call {function_name}{param_section} and show me the result"
-  )
+    param_section = (
+        " with params"
+        f" {params if isinstance(params, str) else json.dumps(params)}"
+        if params is not None
+        else ""
+    )
+    agent_runner.run(
+        f"Call {function_name}{param_section} and show me the result"
+    )
 
-  model_response_event = agent_runner.get_events()[-1]
-  assert model_response_event.author == "context_variable_update_agent"
-  assert model_response_event.content.role == "model"
-  assert expected in model_response_event.content.parts[0].text.strip()
+    model_response_event = agent_runner.get_events()[-1]
+    assert model_response_event.author == "context_variable_update_agent"
+    assert model_response_event.content.role == "model"
+    assert expected in model_response_event.content.parts[0].text.strip()