Mysti

The pitch for Mysti is simple and, unusually, the product matches it: you get Claude Code, OpenAI Codex, Gemini, Copilot, Cursor, and Cline side by side in one VS Code panel rather than switching windows and trying to remember what the last model said. The feature that justifies the install is the adversarial loop. Ask one agent to write the tests and another to attack the coverage and you catch the gaps a single pass misses. Ask three agents to read the same stack trace cold and the consensus — or the disagreement — tells you where the uncertainty actually lives. Cross-checked language ports and multi-file refactors are the same story: independent proposals you can compare rather than one confident answer you have to trust. What you give up is speed and reach. A panel of agents debating is inherently slower than one model streaming an autocomplete, so Mysti fits review-and-refactor work more than line-by-line typing. Configuration matters more than the marketing suggests: the seed data describes customizable agent roles via configuration, and the quality of the debate depends on how you set those roles up. It is VS Code only, with no API or headless path, so automated pipelines and CI checks are out of scope. The project is also young with a smaller user base, which means fewer community recipes to copy and a longer odds that an edge case goes unreported. Where it fits: individual developers and small teams on complex codebases who want multi-model review without adding a subscription line item, and open-source contributors who want a free multi-agent assistant. Where it does not: beginners who want quiet autocomplete, anyone outside VS Code, and teams whose AI code work has to happen inside an automated pipeline. Compare it against Continue if you want an open-source VS Code assistant with a single model, or Cursor if you want a standalone editor with a polished single-agent loop and are willing to pay. Mysti's bet is the opposite: more voices, no invoice.