diff --git a/prompts/planner/plan.md b/prompts/planner/plan.md
index df5fb8c..97588b4 100644
--- a/prompts/planner/plan.md
+++ b/prompts/planner/plan.md
@@ -9,20 +9,8 @@ When breaking a feature into stories, think about:
 ### Independence
 Each story should be independently deployable. After completing story N, the codebase should be in a valid, working state — even if the feature isn't fully built yet.
 
-### Context Window Fit
-A story must fit in a single AI context window (~100K tokens). This means:
-- Reading relevant existing code
-- Understanding the task
-- Implementing the change
-- Writing tests
-- Running quality checks
-- Committing
-
-Budget roughly:
-- 30% of context for reading/understanding
-- 40% for implementation
-- 20% for testing and quality
-- 10% for bookkeeping (prd.json, progress.md)
+### Scope
+A story must be completable in a single iteration. Keep each story focused — a handful of files modified, not a sweeping change across the whole codebase. If a story requires reading and modifying more than ~10 files, it's too big — split it.
 
 ### Failure Isolation
 If a story fails (evaluator rejects it), the next iteration should be able to retry it cleanly. Stories with too many moving parts are hard to retry because partial state is messy.