README.md•5.77 kB
# System Prompts MCP Server
Expose the prompt collection in this repository as a Model Context Protocol (MCP) server. Each prompt, summary, or tool definition maps to a dedicated MCP tool so your client can fetch the exact configuration it needs (e.g. Devin system prompt, Cursor summary) on demand.
The original prompt archive README now lives under `prompts/README.md`.
---
## Features
- **Automatic discovery** – every text/yaml/json prompt in `prompts/` (or any directory you point to) is scanned and exposed as an MCP tool.
- **Model-aware suggestions** – `get_prompt_suggestion` ranks prompts against the LLM you’re using (Claude, GPT, Gemini, etc.) and the keywords you provide.
- **Quick browsing** – `list_prompts` filters by service, flavor (`summary`, `system`, `tools`), or provider hints.
- **Persona activation** – each tool call includes a reminder for the model to embody the loaded prompt so it behaves like the original service.
- **Structured responses** – tool calls return both raw file contents and metadata (service, variant, path, inferred LLM family, persona hint).
---
## Project Layout
- `src/` – TypeScript MCP server implementation
- `index.ts` registers tools (`list_prompts`, `get_prompt_suggestion`, plus one tool per prompt file)
- `config/prompts.ts` discovers prompt files and infers metadata
- `lib/` helpers for slugging, LLM detection, and ranking
- `dist/` – compiled JavaScript (created by the build step)
- `prompts/` – full prompt library and original documentation
---
## Getting Started
```bash
npm install
npm run build
```
> `npm install` automatically registers this server with Claude Desktop (if present) by updating `~/Library/Application Support/Claude/claude_desktop_config.json`. You can opt out by removing the `postinstall` script from `package.json`.
Start the server on stdio (suitable for Claude Desktop, Cursor MCP, etc.):
```bash
npm run start
```
Run in watch/dev mode:
```bash
npm run dev
```
**Environment variables**
- `PROMPT_LIBRARY_ROOT` (optional) – override the prompt root. If unset, the server automatically prefers `prompts/` (when available) and falls back to the repository root.
---
## MCP Tools
| Tool | Description |
| ------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------- |
| `list_prompts` | Lists available prompts with optional filters (`service`, `flavor`, `provider`, `limit`). |
| `get_prompt_suggestion` | Suggests the best prompt for a given LLM/service/keywords, returning ranked alternatives. |
| `<service>-<variant>-<flavor>` | One tool per prompt resource (e.g. `cursor-agent-system` or `devin-summary`). Returns the file contents plus a persona activation hint. |
**Example:**
```jsonc
// Call list_prompts with filters
{
"name": "list_prompts",
"arguments": { "service": "cursor", "flavor": "system" },
}
```
```jsonc
// Ask for a suggestion tailored to Claude
{
"name": "get_prompt_suggestion",
"arguments": {
"userLlm": "claude-3.5-sonnet",
"keywords": ["code", "pair programming"],
},
}
```
Once you have a tool name (e.g. `cursor-agent-system`), call it with optional `format: "json"` to receive structured metadata only.
---
## Claude Desktop Integration
Add the server to `~/Library/Application Support/Claude/claude_desktop_config.json`:
```jsonc
"system-prompts-mcp": {
"command": "/Users/<you>/.nvm/versions/node/v22.17.0/bin/node",
"args": [
"/Users/<you>/Documents/projects/system-prompts-and-models-of-ai-tools/dist/index.js"
],
"env": {
"PROMPT_LIBRARY_ROOT": "/Users/<you>/Documents/projects/system-prompts-and-models-of-ai-tools/prompts"
}
}
```
Restart Claude Desktop to load the new MCP server, then ask for prompts by name or use the suggestion tool.
---
## Development
- `npm run dev` – run with `ts-node` for quick iteration
- `npm run lint` – type-check without emitting files
Contributions welcome—feel free to adapt the discovery logic, add tests, or extend metadata inference for new prompt formats.
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