Rubber Duck MCP server

This is a helper that lets your AI talk to more than one AI model at the same time. You explain a problem once, and several different AI "ducks" each give you their own take. It is handy if you want a second, third, or fourth opinion before you decide something.

What this MCP server does

You ask your AI a question, like "is this plan any good?" The AI passes that question to this helper, which sends it to the models you set up, such as OpenAI, Gemini, or a coding tool on your machine. Each model answers on its own, and the helper collects everything. Then your AI shows you the answers, either one at a time or side by side, so you can compare. It can also keep a conversation going with one model, so you can go back and forth.

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What you can do with it

• Ask the same question to several AI models and compare their answers
• Have a back and forth chat with one model while keeping the earlier context
• Run a vote where several models pick an option and give their reasoning
• Have one model judge and rank the answers the others gave
• Set up a short debate between models and read a summary at the end
• See how many requests and tokens you have used and the rough cost
• Check which models are set up and whether they are working right now

What it gives back to you

You get the answers back in your chat, usually as text you can read right away. When you compare or vote, you get the responses grouped together, often with which model said what. Some setups show a nicer visual panel with the answers side by side, a vote tally, or a usage summary. If a model fails, you still get the other answers and a note about what went wrong.

Before you start

Who it's for

People who want a second opinion on their work, like writers, planners, and anyone who likes to check an idea from more than one angle.