diff --git a/packages/uipath/src/uipath/eval/evaluators/legacy_trajectory_evaluator.py b/packages/uipath/src/uipath/eval/evaluators/legacy_trajectory_evaluator.py
index 17b69d0d0..cff0e8788 100644
--- a/packages/uipath/src/uipath/eval/evaluators/legacy_trajectory_evaluator.py
+++ b/packages/uipath/src/uipath/eval/evaluators/legacy_trajectory_evaluator.py
@@ -12,13 +12,13 @@
 
 from ..._utils.constants import COMMUNITY_agents_SUFFIX
 from .._execution_context import eval_set_run_id_context
+from .._helpers.evaluators_helpers import trace_to_str
 from .._helpers.helpers import is_empty_value
 from ..models import EvaluationResult
 from ..models.models import (
     AgentExecution,
     LLMResponse,
     NumericEvaluationResult,
-    TrajectoryEvaluationTrace,
     UiPathEvaluationError,
     UiPathEvaluationErrorCategory,
 )
@@ -140,10 +140,7 @@ def _create_evaluation_prompt(
             and agent_run_history
             and isinstance(agent_run_history[0], ReadableSpan)
         ):
-            trajectory_trace = TrajectoryEvaluationTrace.from_readable_spans(
-                agent_run_history
-            )
-            agent_run_history = str(trajectory_trace.spans)
+            agent_run_history = trace_to_str(agent_run_history)
         else:
             agent_run_history = str(agent_run_history)
 
diff --git a/packages/uipath/tests/evaluators/test_legacy_trajectory_evaluator.py b/packages/uipath/tests/evaluators/test_legacy_trajectory_evaluator.py
new file mode 100644
index 000000000..f7121d800
--- /dev/null
+++ b/packages/uipath/tests/evaluators/test_legacy_trajectory_evaluator.py
@@ -0,0 +1,57 @@
+import uuid
+
+from opentelemetry.sdk.trace import ReadableSpan
+
+from uipath.eval.evaluators import LegacyTrajectoryEvaluator
+from uipath.eval.models.models import LegacyEvaluatorCategory, LegacyEvaluatorType
+
+
+def _legacy_trajectory_evaluator() -> LegacyTrajectoryEvaluator:
+    return LegacyTrajectoryEvaluator(
+        id=str(uuid.uuid4()),
+        name="Legacy trajectory",
+        category=LegacyEvaluatorCategory.Trajectory,
+        type=LegacyEvaluatorType.Trajectory,
+        prompt="History:\n{{AgentRunHistory}}\nExpected:\n{{ExpectedAgentBehavior}}",
+        createdAt="2026-05-14T00:00:00Z",
+        updatedAt="2026-05-14T00:00:00Z",
+    )
+
+
+def test_legacy_trajectory_prompt_uses_compact_tool_history() -> None:
+    long_prompt = "SYSTEM_PROMPT_" + ("x" * 10_000)
+    spans = [
+        ReadableSpan(
+            name="agent_llm_call",
+            start_time=0,
+            end_time=1,
+            attributes={
+                "openinference.span.kind": "LLM",
+                "input.value": f'{{"messages": [{{"role": "system", "content": "{long_prompt}"}}]}}',
+                "output.value": '{"generations": []}',
+            },
+        ),
+        ReadableSpan(
+            name="search_profiles",
+            start_time=1,
+            end_time=2,
+            attributes={
+                "openinference.span.kind": "TOOL",
+                "tool.name": "search_profiles",
+                "input.value": '{"query": "mentor"}',
+                "output.value": '{"content": "found mentor profile"}',
+                "metadata": f'{{"agent_prompt": "{long_prompt}"}}',
+            },
+        ),
+    ]
+
+    prompt = _legacy_trajectory_evaluator()._create_evaluation_prompt(
+        expected_agent_behavior="The agent should search matching profiles.",
+        agent_run_history=spans,
+    )
+
+    assert "SYSTEM_PROMPT_" not in prompt
+    assert "Tool: search_profiles" in prompt
+    assert '{"query": "mentor"}' in prompt
+    assert "found mentor profile" in prompt
+    assert "agent_llm_call" not in prompt