MCP SuperAssistant is a Chrome and Firefox extension that adds Model Context Protocol (MCP) tool execution to web-based AI chat platforms. It lets you use MCP servers from your existing chat subscriptions, without API keys, by detecting tool calls in the model's responses and running them through a local proxy.
The extension adds a sidebar to a supported chat site. You insert an MCP instructions prompt into the conversation so the model knows which tools exist and how to format calls; when the model emits a tool call, the extension renders it as a card, executes it (manually via a Run button or automatically), and inserts the result back into the chat. Calls travel over SSE, streamable HTTP, or WebSocket to the mcp-superassistant-proxy process, which forwards them to your configured MCP servers.
The proxy reads a config.json in the same format as Claude Desktop's server configuration, so local stdio servers and remote MCP URLs (Composio, Zapier, Smithery, and others) both work. It can also add CORS support to remote servers and expose health endpoints.
Supported platforms include ChatGPT, Google Gemini, Perplexity, Grok, Google AI Studio, OpenRouter Chat, DeepSeek, T3 Chat, GitHub Copilot, Mistral AI, Kimi, Qwen Chat, and Z Chat.
Features
- Tool detection: recognises MCP tool calls in AI responses and renders them as function-call cards
- Tool execution: run a detected call with one click or enable auto-execute mode
- Result insertion: writes tool output back into the conversation, with an auto-submit mode to continue the chat
- Local proxy: npx @srbhptl39/mcp-superassistant-proxy bridges the extension to stdio and remote MCP servers
- Transports: SSE, streamable HTTP, and WebSocket endpoints
- Config compatibility: reuses Claude Desktop-style config.json server definitions
- Push content mode: shifts page content aside instead of overlaying the sidebar
- Preferences: remembers sidebar position, size, and settings, and follows the host platform's light or dark theme
