Agent bead ID validation was hardcoded to only accept "gt-" prefix, which caused errors when spawning beads polecats (which use "bd-" prefix): Error: invalid agent ID: agent ID must start with 'gt-' (got "bd-beads-polecat-pearl") Changed ParseAgentBeadID to accept any 2-3 character prefix (gt-, bd-, hq-) instead of hardcoding "gt-". Updated tests to cover other prefixes. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>