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Root cause of "(empty response)" for Reddit MCP:
- Reddit MCP returns valid JSON (posts with titles, scores, etc.)
- agent_loop.py truncated display text to 2000 chars
- Truncated JSON breaks JSON.parse in frontend ToolCallBubble
- Frontend falls through to data: {} → renders "(empty response)"
- Increased display limit to 15000 chars (matches BrowserGetText)
Twitter/xbird MCP:
- Returns "402 Payment Required" — xbird needs paid credits
- Not an OpenSwarm bug, tool itself requires payment
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>