diff --git a/agents.md b/agents.md
index 6f3ac2d..d3fb730 100644
--- a/agents.md
+++ b/agents.md
@@ -7,6 +7,7 @@
 ## tech stack
 - python; pandas or polars
 - file storage: json and csv, no sqlite or databases
+- assume local virtual env is available and accessible
 - do not add new dependencies unless explicitly approved; if unavoidable, document justification in the active task notes
 
 ## workflow