MCP and connected apps
Use your blocks and prompts from your AI apps through PromptMason's built-in MCP server, or from any website with the Chrome extension, and control what they can do.
This section is about using your library from other apps on your PC.
The ideas to know first:
- The built-in MCP server: PromptMason includes an MCP server, so AI apps that support MCP (Model Context Protocol), such as Claude Desktop, Cursor and Claude Code, can search your library, fill in your prompts and, if you allow it, save new blocks and prompts, right from your conversation. There’s nothing extra to install: you add it from Settings → AI & connected apps → Connect an AI agent.
- The Chrome extension: finds and copies your prompts on any website in Chrome.
- What connected apps can do: one setting for both. Full access lets AI apps read and change your library, Read-only lets them search and read, and Off gives them no access. Full access is the default. Each team library also has its own setting for AI apps.
- PromptMason must be open while an AI app or the extension uses your library.
The MCP server and the extension talk only to PromptMason on your PC. When an AI app reads something from your library, that text goes to the AI service behind the app, under its terms. Privacy in PromptMason lists when anything leaves your PC.
Start with PromptMason’s built-in MCP server, then connect your AI agent. If you use Chrome, set up the Chrome extension.
Guides in this section
- PromptMason's built-in MCP server: What the MCP server inside PromptMason does, which AI apps can use it, what they can do in your library, and how you stay in control.
- Connect an AI agent through MCP: Add PromptMason to Claude Desktop, Cursor or Claude Code, and understand the security notice Claude Desktop shows.
- Control what connected apps can do: Choose Full access, Read-only or Off for AI agents and the Chrome extension, set what AI apps can do in a team library, and manage the tokens they use.
- MCP tools: what an AI agent can do: Everything a connected AI agent can find, use and change in PromptMason, what works in Read-only, and requests you can try.
- The Chrome extension: Install the PromptMason extension for Chrome, connect it with the extension token, and search and copy your prompts on any website.
- Troubleshooting MCP connections: What to do when adding PromptMason to your AI agent doesn't finish, or your AI agent reports a problem with PromptMason.
Want a hand?
Copy this prompt into Claude, ChatGPT or another AI assistant, and it walks you through it step by step.
I want my AI assistant to use my PromptMason library. Explain what PromptMason's MCP server does, how to connect Claude Desktop, Cursor or Claude Code, the difference between Full access and Read-only, and which guide to read first.
Copy adds a short note about PromptMason and this guide's steps, so the assistant has what it needs.
I want my AI assistant to use my PromptMason library. Explain what PromptMason's MCP server does, how to connect Claude Desktop, Cursor or Claude Code, the difference between Full access and Read-only, and which guide to read first. About PromptMason: a Windows desktop app for building AI prompts from reusable blocks. A person writes blocks (reusable pieces of prompt text), builds prompts from them on the Build screen (or keeps a Markdown document, such as a Skill), and copies a prompt into an AI tool, runs it in PromptMason’s own Chat, or lets a connected AI agent use it through PromptMason’s built-in MCP server (the Chrome extension copies prompts on any website). AI assist, Evaluate and Chat use a local model that runs on the person’s PC, or their own AI provider. The guides are also on PromptMason’s Help screen, and Chat can answer “how do I” questions from them. Libraries hold the blocks and prompts; a person can sync their personal library to their other PCs and share team libraries, both through a folder in cloud storage they already have (OneDrive, Google Drive or Dropbox). Everything synced is encrypted and every edit is signed and checked. A recovery kit (a file plus a code) is the spare copy of the person’s keys, for when every PC is lost. The official guide for this is "MCP and connected apps": https://promptmason.ai/docs/connected-apps Its full text follows, between the lines. Use it as the source of truth, and if anything I see differs from it, tell me rather than guessing. --- This section is about using your library from other apps on your PC. The ideas to know first: - **The built-in MCP server:** PromptMason includes an MCP server, so AI apps that support MCP (Model Context Protocol), such as Claude Desktop, Cursor and Claude Code, can search your library, fill in your prompts and, if you allow it, save new blocks and prompts, right from your conversation. There's nothing extra to install: you add it from **Settings → AI & connected apps → Connect an AI agent**. - **The Chrome extension:** finds and copies your prompts on any website in Chrome. - **What connected apps can do:** one setting for both. **Full access** lets AI apps read and change your library, **Read-only** lets them search and read, and **Off** gives them no access. **Full access** is the default. Each team library also has its own setting for AI apps. - **PromptMason must be open** while an AI app or the extension uses your library. The MCP server and the extension talk only to PromptMason on your PC. When an AI app reads something from your library, that text goes to the AI service behind the app, under its terms. [Privacy in PromptMason](https://promptmason.ai/docs/privacy-overview) lists when anything leaves your PC. Start with [PromptMason's built-in MCP server](https://promptmason.ai/docs/mcp-server), then [connect your AI agent](https://promptmason.ai/docs/connect-ai-agent). If you use Chrome, set up [the Chrome extension](https://promptmason.ai/docs/chrome-extension). --- How to help me: - Go one step at a time. After each step, ask what I see on screen before giving the next one. - Use the exact words on PromptMason’s buttons and screens, as the guide does. - Never ask me for my recovery code, my recovery kit file, a password or my invite line, and never ask me to paste them here. - Start by asking which step I’m on, or what I see now.