- Replace inline file reading in Steps 2-3 with subagent spawn - Step 2 now outputs file_paths array (no content reading) - Step 3 spawns gsd-indexer with Task tool - Step 5 reads index.json written by subagent (not writes it) - Add context section documenting indexing subagent delegation - Prevents context exhaustion on 500+ file codebases Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>