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+---
+name: "Add configurable chat history pruning"
+---
+
+# Story 179: Add configurable chat history pruning
+
+## User Story
+
+As a user, I want chat history to be automatically pruned to a configurable limit, so that long sessions don't bloat localStorage and degrade performance.
+
+## Acceptance Criteria
+
+- [ ] Default limit of 200 messages is applied when saving to localStorage
+- [ ] Messages are pruned from the front (oldest removed first) via messages.slice(-limit)
+- [ ] Limit is configurable via localStorage key storykit-chat-history-limit:{projectPath}
+- [ ] A limit of 0 means unlimited (no pruning)
+- [ ] useChatHistory returns maxMessages and setMaxMessages for future UI use
+- [ ] Existing useChatHistory tests continue to pass
+- [ ] New tests cover: pruning at limit, custom limit, unlimited mode
+
+## Out of Scope
+
+- TBD