diff --git a/src/resources/extensions/sf/prompts/refine-slice.md b/src/resources/extensions/sf/prompts/refine-slice.md
index 18df6f24e..34dc19d6e 100644
--- a/src/resources/extensions/sf/prompts/refine-slice.md
+++ b/src/resources/extensions/sf/prompts/refine-slice.md
@@ -72,7 +72,7 @@ Then:
 
 The slice directory and tasks/ subdirectory already exist. Do NOT mkdir.
 
-**Autonomous execution:** Do not call `ask_user_questions` or `secure_env_collect`. Document assumptions in the plan.
+**Autonomous execution:** Do not call `ask_user_questions` or `secure_env_collect`. You are running in auto-mode — there is no human available to answer questions. Make reasonable assumptions and document them in the plan. If a decision genuinely requires human input, write a note in the relevant task's description and call `sf_plan_slice` with what you have.
 
 **You MUST call `sf_plan_slice` to persist the planning state before finishing.** After it returns successfully, the pipeline will automatically clear the sketch flag on the next state derivation (the on-disk PLAN file is the signal).