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+---
+name: "Web UI agent assignment dropdown on work items"
+---
+
+# Story 339: Web UI agent assignment dropdown on work items
+
+## User Story
+
+As a project owner using the web UI, I want to select which agent to assign to a work item from a dropdown, so that I can control agent assignments visually.
+
+## Acceptance Criteria
+
+- [ ] Agent dropdown visible in expanded work item detail panel
+- [ ] Shows available agents filtered by appropriate stage (coders for current, QA for qa, mergemaster for merge)
+- [ ] Selecting an agent stops any current agent and starts the new one
+- [ ] Updates the story front matter with the agent assignment
+- [ ] Shows agent status (running, idle) in the dropdown
+
+## Out of Scope
+
+- TBD