Cursor 2.2 Debug Mode Fixed My Bugs Automatically (Multi-Agent Features)

Quick Overview

Cursor version 2.2 introduces significant updates including Debug Mode, Plan Mode improvements with inline Mermaid diagrams, Multi-Agent Judging, and Pinned Chats, demonstrated by automatically debugging a key mismatch error in an evaluation pipeline and implementing a major feature enhancement for concurrent test execution.

Key Points: Cursor 2.2 released new features: Debug Mode for reproducing and fixing tricky bugs using runtime logs, Plan Mode enhancements supporting inline Mermaid diagrams, Multi-Agent Judging, and Pinned Chats. Debug Mode successfully identified and fixed a key mismatch bug where LLMJudge.evaluate() returned 'qualityscore' but HybridEvaluator accessed 'score' in three locations, resolving a KeyError. Plan Mode improvements allow agents to generate and stream visuals like Mermaid diagrams directly into their plans, as demonstrated when planning feature enhancements for the PraisonAI Bench project. Multi-Agent Judging was shown where two agents (Gemini 3 Pro and Opus 4.5) collaborated to build a feature implementation plan, with the user selecting the preferred model output for the task. The parallel/concurrent test execution feature was implemented in PraisonAI Bench, resulting in a 3.3x speedup (7.93s vs 26.25s for 4 tests) compared to sequential execution. Pinned Chats allow users to keep important conversations visible in the agent sidebar at the top for quick future reference, demonstrated by pinning the feature implementation chat.

Context: This video serves as a changelog walkthrough for Cursor version 2.2, presented by a developer showcasing new AI coding assistant features. The presenter focuses on demonstrating how these new capabilities—especially Debug Mode and enhanced Plan Mode—streamline complex development tasks like debugging subtle errors and architecting significant code improvements within a hypothetical project called PraisonAI Bench.

Detailed Analysis

The video details the major updates in Cursor version 2.2, beginning with Debug Mode. Debug Mode instruments code, captures runtime logs during reproduction, and fixes the root cause, allowing users to verify fixes precisely. The presenter demonstrates this by using Debug Mode to find a bug in the PraisonAI Bench project: a key mismatch between 'qualityscore' output from LLMJudge.evaluate() and the 'score' key expected by HybridEvaluator in three different locations. The agent successfully generated hypotheses, instrumented the code, confirmed the bug, and applied fixes to all three locations, ensuring backward compatibility by falling back to 'score' if present.