diff --git a/docs/edge/ar/guides/flows/conversational-flows.mdx b/docs/edge/ar/guides/flows/conversational-flows.mdx
index e7d4253b0..e58933b92 100644
--- a/docs/edge/ar/guides/flows/conversational-flows.mdx
+++ b/docs/edge/ar/guides/flows/conversational-flows.mdx
@@ -82,7 +82,7 @@ try:
     flow.handle_turn("Where is my order?", session_id=session_id)
     flow.handle_turn("What about returns?", session_id=session_id)
 finally:
-    flow.finalize_session_traces()  # one trace link for the whole chat
+    flow.finalize_session_traces()  # one trace for the whole chat
 ```
 
 ## بث جولة
diff --git a/docs/edge/ar/observability/tracing.mdx b/docs/edge/ar/observability/tracing.mdx
index adf4f0853..549570545 100644
--- a/docs/edge/ar/observability/tracing.mdx
+++ b/docs/edge/ar/observability/tracing.mdx
@@ -154,6 +154,8 @@ result = flow.kickoff()
 للتتبعات المرتبطة بحسابك، افتح [علامة تبويب التتبعات في لوحة تحكم CrewAI AMP](https://app.crewai.com/crewai_plus/trace_batches) لعرض تفاعلات الوكلاء واستخدام الأدوات واستدعاءات LLM.
 ![واجهة تتبع CrewAI](/images/view-traces.png)
 
+بعد تشغيلٍ وصلت نطاقاته (spans) إلى CrewAI AMP، يكتب crewAI الملف `.crewai/last_run.json` في مجلد المشروع: معرّف التنفيذ، وما إذا كان التتبع مجهولاً أو تحت حسابك، ووقت البدء والانتهاء، وعنوان AMP الذي أُرسل إليه. يقرأه الأمر `crewai eval` لتقييم آخر تشغيل دون نسخ أي معرّف. يتضمن `.gitignore` في القالب المجلد `.crewai/`؛ ولا يُسجَّل إلا التشغيل الذي صُدِّر كاملاً، ولا يُكتب شيء عند `CREWAI_TESTING=true`.
+
 ### البديل: إعداد متغير البيئة
 
 يمكنك أيضاً تفعيل التتبع عالمياً عبر تعيين متغير بيئة:
diff --git a/docs/edge/en/guides/flows/conversational-flows.mdx b/docs/edge/en/guides/flows/conversational-flows.mdx
index c0ae83d74..67b53b701 100644
--- a/docs/edge/en/guides/flows/conversational-flows.mdx
+++ b/docs/edge/en/guides/flows/conversational-flows.mdx
@@ -82,7 +82,7 @@ try:
     flow.handle_turn("Where is my order?", session_id=session_id)
     flow.handle_turn("What about returns?", session_id=session_id)
 finally:
-    flow.finalize_session_traces()  # one trace link for the whole chat
+    flow.finalize_session_traces()  # one trace for the whole chat
 ```
 
 ## Streaming a turn
diff --git a/docs/edge/en/observability/tracing.mdx b/docs/edge/en/observability/tracing.mdx
index 6aeb46156..252474f5b 100644
--- a/docs/edge/en/observability/tracing.mdx
+++ b/docs/edge/en/observability/tracing.mdx
@@ -154,6 +154,8 @@ Traces are uploaded only after a successful authenticated export or an explicitl
 For traces associated with your account, open the [Traces tab in the CrewAI AMP dashboard](https://app.crewai.com/crewai_plus/trace_batches) to view agent interactions, tool usage, and LLM calls.
 ![CrewAI Tracing Interface](/images/view-traces.png)
 
+After a run whose spans reached CrewAI AMP, crewAI writes `.crewai/last_run.json` in the project directory: the run's execution id, whether it was traced anonymously or under your account, when it started and finished, and the AMP it was sent to. `crewai eval` reads it to evaluate the last run without you copying an id. The scaffold's `.gitignore` covers `.crewai/`; only a run exported whole is recorded, and nothing is written under `CREWAI_TESTING=true`.
+
 ### Alternative: Environment Variable Configuration
 
 You can also enable tracing globally by setting an environment variable:
diff --git a/docs/edge/ko/observability/tracing.mdx b/docs/edge/ko/observability/tracing.mdx
index e7b3ad90e..3da5b0414 100644
--- a/docs/edge/ko/observability/tracing.mdx
+++ b/docs/edge/ko/observability/tracing.mdx
@@ -154,6 +154,8 @@ result = flow.kickoff()
 계정에 연결된 추적은 [CrewAI AMP 대시보드의 Traces 탭](https://app.crewai.com/crewai_plus/trace_batches)에서 agent 상호 작용, 도구 사용 및 LLM 호출을 확인하세요.
 ![CrewAI Tracing Interface](/images/view-traces.png)
 
+스팬이 CrewAI AMP에 도달한 실행이 끝나면 crewAI는 프로젝트 디렉터리에 `.crewai/last_run.json`을 기록합니다. 실행 ID, 익명 또는 계정으로 추적되었는지, 시작·종료 시각, 전송된 AMP 주소가 담깁니다. `crewai eval`은 이 파일을 읽어 ID를 복사하지 않고도 마지막 실행을 평가합니다. 스캐폴드의 `.gitignore`는 `.crewai/`를 포함하며, 전체가 내보내진 실행만 기록되고 `CREWAI_TESTING=true`에서는 아무것도 기록되지 않습니다.
+
 ### 대안: 환경 변수 구성
 
 환경 변수를 설정하여 전역적으로 추적을 활성화할 수도 있습니다:
diff --git a/docs/edge/pt-BR/guides/flows/conversational-flows.mdx b/docs/edge/pt-BR/guides/flows/conversational-flows.mdx
index 38bf02d4c..257f7c3a0 100644
--- a/docs/edge/pt-BR/guides/flows/conversational-flows.mdx
+++ b/docs/edge/pt-BR/guides/flows/conversational-flows.mdx
@@ -82,7 +82,7 @@ try:
     flow.handle_turn("Where is my order?", session_id=session_id)
     flow.handle_turn("What about returns?", session_id=session_id)
 finally:
-    flow.finalize_session_traces()  # one trace link for the whole chat
+    flow.finalize_session_traces()  # one trace for the whole chat
 ```
 
 ## Streaming de um turno
diff --git a/docs/edge/pt-BR/observability/tracing.mdx b/docs/edge/pt-BR/observability/tracing.mdx
index c21fcf439..c31439978 100644
--- a/docs/edge/pt-BR/observability/tracing.mdx
+++ b/docs/edge/pt-BR/observability/tracing.mdx
@@ -154,6 +154,8 @@ Os rastreamentos são enviados somente após uma exportação autenticada bem-su
 Para rastreamentos associados à sua conta, abra a [aba Traces no painel CrewAI AMP](https://app.crewai.com/crewai_plus/trace_batches) para visualizar interações dos agentes, uso de ferramentas e chamadas de LLM.
 ![CrewAI Tracing Interface](/images/view-traces.png)
 
+Após uma execução cujos spans chegaram ao CrewAI AMP, o crewAI grava `.crewai/last_run.json` no diretório do projeto: o id da execução, se foi rastreada anonimamente ou na sua conta, quando começou e terminou, e o AMP para onde foi enviada. O `crewai eval` lê esse arquivo para avaliar a última execução sem você copiar um id. O `.gitignore` do scaffold já cobre `.crewai/`; só uma execução exportada por inteiro é registrada, e nada é gravado com `CREWAI_TESTING=true`.
+
 ### Alternativa: Configuração de Variável de Ambiente
 
 Você também pode habilitar o rastreamento globalmente definindo uma variável de ambiente:
diff --git a/lib/crewai/src/crewai/telemetry/tracing/ephemeral.py b/lib/crewai/src/crewai/telemetry/tracing/ephemeral.py
index 905c59034..0c160a895 100644
--- a/lib/crewai/src/crewai/telemetry/tracing/ephemeral.py
+++ b/lib/crewai/src/crewai/telemetry/tracing/ephemeral.py
@@ -143,7 +143,10 @@ class EphemeralSpanBuffer(SpanExporter):
                     logger.warning("Ephemeral trace export failed; buffer discarded")
             finally:
                 exporter.shutdown()
-            exporter.record_export()
+            if (
+                not self._dropped
+            ):  # a truncated trace is not recorded: the grader could not read it whole
+                exporter.record_export()
         except TraceGrantError as error:
             logger.warning(
                 "Ephemeral trace grant failed (HTTP %s); buffer discarded",
diff --git a/lib/crewai/src/crewai/telemetry/tracing/last_run.py b/lib/crewai/src/crewai/telemetry/tracing/last_run.py
index 8e1f50075..31e2230b1 100644
--- a/lib/crewai/src/crewai/telemetry/tracing/last_run.py
+++ b/lib/crewai/src/crewai/telemetry/tracing/last_run.py
@@ -68,14 +68,19 @@ def record_last_run(
         "recorded_at": datetime.now(timezone.utc).isoformat(timespec="milliseconds"),
         "amp_base_url": amp_base_url,
     }
-    path = last_run_path()
+    path: Path | None = None
     try:
+        path = last_run_path()
         path.parent.mkdir(parents=True, exist_ok=True)
         temporary = path.with_name(path.name + ".tmp")
         temporary.write_text(json.dumps(record, indent=2) + "\n", encoding="utf-8")
         os.replace(temporary, path)
-    except OSError as error:
-        logger.debug("Could not record the last run in %s: %s", path, error)
+    except OSError as error:  # a vanished cwd fails last_run_path() too; the run is never failed by this
+        logger.debug(
+            "Could not record the last run in %s: %s",
+            path or ".crewai/last_run.json",
+            error,
+        )
         return None
     return path
 
diff --git a/lib/crewai/tests/telemetry/test_session_trace_export.py b/lib/crewai/tests/telemetry/test_session_trace_export.py
index 509fa473e..839011ce7 100644
--- a/lib/crewai/tests/telemetry/test_session_trace_export.py
+++ b/lib/crewai/tests/telemetry/test_session_trace_export.py
@@ -252,7 +252,18 @@ def test_a_deferred_run_is_recorded_once_at_finalization_and_a_failed_export_nev
 
 
 @pytest.mark.parametrize("credential", [None, "pat"])
-def test_a_refreshed_grant_still_records_the_run_once(collector, recorded_runs, capsys, credential):
+def test_a_refreshed_grant_still_records_the_run_once(
+    collector, recorded_runs, monkeypatch, capsys, credential
+):
+    from crewai.telemetry.tracing import last_run
+
+    writes = []
+    real_record = last_run.record_last_run
+    monkeypatch.setattr(
+        last_run,
+        "record_last_run",
+        lambda **fields: (writes.append(fields["execution_id"]), real_record(**fields))[1],
+    )
     collector.grant_override = {"trace_url": collector.url + "/crewai_plus/otel_traces/original"}
     client = TraceGrantClient(credential)
     grant = replace(
@@ -267,9 +278,8 @@ def test_a_refreshed_grant_still_records_the_run_once(collector, recorded_runs,
     finally:
         session.shutdown()
     exporter.record_export()
-    first = recorded_runs.joinpath(".crewai", "last_run.json").stat().st_mtime_ns
     exporter.record_export()
-    assert recorded_runs.joinpath(".crewai", "last_run.json").stat().st_mtime_ns == first
+    assert writes == [grant.execution_uuid]  # written once, however often the exporter is told the run ended
     assert capsys.readouterr().out == ""
     written = _last_run(recorded_runs)
     assert written is not None and written["execution_id"] == grant.execution_uuid
@@ -280,6 +290,51 @@ def test_a_refreshed_grant_still_records_the_run_once(collector, recorded_runs,
     )
 
 
+def test_the_recorded_window_is_the_first_start_and_last_end_across_batches(
+    collector, recorded_runs
+):
+    """Batches reach the exporter in any order; the record spans them all."""
+    from crewai.telemetry.tracing import last_run
+
+    memory = InMemorySpanExporter()
+    provider = TracerProvider()
+    provider.add_span_processor(SimpleSpanProcessor(memory))
+    tracer = provider.get_tracer("window")
+    second = 1_000_000_000
+    base = 1_700_000_000 * second
+    for name, start, end in (("late", 10, 12), ("early", 0, 5), ("middle", 3, 9)):
+        tracer.start_span(name, start_time=base + start * second).end(end_time=base + end * second)
+    provider.shutdown()
+    by_name = {span.name: span for span in memory.get_finished_spans()}
+    client = TraceGrantClient(None)
+    exporter = GrantSpanExporter(client, client.create(str(uuid4())))
+    try:
+        assert exporter.export([by_name["late"]]) == SpanExportResult.SUCCESS
+        assert exporter.export([by_name["early"], by_name["middle"]]) == SpanExportResult.SUCCESS
+    finally:
+        exporter.shutdown()
+    exporter.record_export()
+    written = _last_run(recorded_runs)
+    assert written is not None
+    assert written["started_at"] == last_run._iso(base)
+    assert written["finished_at"] == last_run._iso(base + 12 * second)
+
+
+def test_a_truncated_ephemeral_trace_is_uploaded_but_not_recorded(
+    collector, recorded_runs, monkeypatch
+):
+    """The buffer dropped spans at its cap: the grader could not read the run whole."""
+    monkeypatch.setenv("CREWAI_EPHEMERAL_TRACE_MAX_SPANS", "1")
+    buffer = EphemeralSpanBuffer()
+    monkeypatch.setattr(ephemeral, "EphemeralSpanBuffer", lambda: buffer)
+    with trace_consent(lambda: True), ephemeral_tracing(str(uuid4())) as session:
+        record(session, "first")
+        record(session, "second")
+    assert buffer._dropped == 1
+    assert len(collector.batches) == 1  # what survived was still shared
+    assert _last_run(recorded_runs) is None
+
+
 @pytest.mark.parametrize("authenticated", [True, False])
 def test_an_export_without_a_viewer_url_is_recorded_all_the_same(
     collector, recorded_runs, monkeypatch, capsys, authenticated