# MCP Slim Guard (MCP server)

> MCP Slim Guard is an MCP server that adds tools to AI assistants such as Claude Desktop, Claude Code and Cursor. 76% fewer MCP tokens in our standard benchmark. It has 186 GitHub stars, is released under the MIT license and runs locally with npx -y mcp-slim-guard.

MCP Slim Guard gives a host one deliberate way to reach authorized upstream tools. It keeps input schemas intact, validates calls before the upstream is invoked, and can recover an oversized result exactly without repeating that invocation.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/lennney/mcp-slim-guard |
| GitHub stars | 186 |
| License | MIT |
| Language | TypeScript |
| Transport | stdio |
| Packages | npm: mcp-slim-guard |
| Remote URL | none |
| Needs API key | no |
| Official | no |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code |
| Category | Other |
| Latest release | v0.1.0 (Jul 31, 2026) |
| Last commit | Aug 14, 2026 |
| MCP registry name | io.github.lennney/mcp-slim-guard |

## Install

### Claude Desktop (claude_desktop_config.json)

```json
{
  "mcpServers": {
    "mcp-slim-guard": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-slim-guard"
      ]
    }
  }
}
```

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

### Claude Code

```sh
claude mcp add --transport stdio mcp-slim-guard -- npx -y mcp-slim-guard
```

### Cursor (.cursor/mcp.json)

```json
{
  "mcpServers": {
    "mcp-slim-guard": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-slim-guard"
      ]
    }
  }
}
```

Project file; use ~/.cursor/mcp.json to enable it in every project.

### VS Code (.vscode/mcp.json)

```json
{
  "servers": {
    "mcp-slim-guard": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-slim-guard"
      ]
    }
  }
}
```

Config formats checked against the official docs on 2026-10-07.

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