adding: OUTPUT_FILENAME_PATTERN

README.en-US.md

@@ -688,7 +688,16 @@ GOOGLE_APPLICATION_CREDENTIALS=/path/GCP_ACCESS_KEY.json
 
 ## 12. Output file
 
-Pattern:
+The name is configured directly in `.env`:
+
+```env
+OUTPUT_FILENAME_PATTERN=AGENTE_{agent_id}_LLM_JUDGE_{timestamp}.TXT.GZ
+```
+
+Available placeholders are `{agent_id}`, `{run_id}`, and `{timestamp}`. The
+`timestamp` uses the `YYYYMMDD_HHMMSS` format in the São Paulo time zone.
+
+Resulting default pattern:
 
 ```text
 AGENTE_{agentId}_LLM_JUDGE_{YYYYMMDD}_{HHMMSS}.TXT.GZ
@@ -1463,6 +1472,7 @@ python -m evaluator.cli progress <RUN_ID> --events 100
 | `JUDGE_GCS_BUCKET` | bucket override |
 | `GOOGLE_APPLICATION_CREDENTIALS` | GCP credentials |
 | `OUTPUT_DIR` | temporary export directory |
+| `OUTPUT_FILENAME_PATTERN` | configurable output filename template |
 
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