String AI Web Access MCP Server

The official Model Context Protocol (MCP) server for String AI's Web Access API. Connect any MCP-compatible client — VS Code, Cursor, Windsurf, Claude Desktop, and more — to String AI's powerful web access capabilities.

Tools

Tool	Description
web_access_fetch	Fetch any webpage with automatic anti-bot bypass, CAPTCHA handling, and JavaScript rendering
web_access_search	Search the web with reliable results — bypasses rate limits and bot protection on search engines
web_access_sitemap	Crawl a whole site and map its URLs as an asynchronous job — one tool drives the lifecycle via action

web_access_sitemap — sitemap crawl jobs

A crawl is a two-phase, asynchronous quote → approve → poll → read job: nothing is crawled or billed until the quote is explicitly approved.

action	What it does
submit	Quote a crawl (url required; maxPages ≤ 10000 default 10, maxDepth ≤ 100 default 2, pathPrefix, budgetUsd, useSitemap optional). Returns jobId + estimatedCostUsd + estimatedPages, status awaiting_approval.
approve	Billing consent — starts the crawl. 402 = insufficient funds; 409 partial_state = retry approve.
status	Poll progress: awaiting_approval → running (pending/processed) → completed | failed | canceled | token_cap_exceeded; partial_state = retry approve. Returns counts only — URLs come from results.
results	Paginated discovered URLs (limit ≤ 5000 default 1000, offset). Durable after completion; per-URL discoveredUrls is only present for ~1h.
cancel	Stop a non-terminal job; already-fetched pages stay billed and readable.
list	The account's recent crawl jobs (limit ≤ 100 default 20, offset).

Quick Start

Run with npx

env STRING_AI_API_KEY=your-key npx @usestring/mcp

Install globally

npm install -g @usestring/mcp
STRING_AI_API_KEY=your-key string-ai-mcp

Build from source

git clone https://github.com/usestring/string-ai-mcp.git
cd string-ai-mcp
npm install
npm run build
STRING_AI_API_KEY=your-key node build/index.js

Environment Variables

Variable	Required	Description
STRING_AI_API_KEY	Yes	Your String AI API key

Client Configuration

VS Code

Press Ctrl+Shift+P → Preferences: Open User Settings (JSON) and add:

{
	"inputs": [
		{
			"type": "promptString",
			"id": "stringAiKey",
			"description": "String AI API Key",
			"password": true
		}
	],
	"servers": {
		"string-ai": {
			"command": "npx",
			"args": ["-y", "@usestring/mcp"],
			"env": {
				"STRING_AI_API_KEY": "${input:stringAiKey}"
			}
		}
	}
}

Or add a .vscode/mcp.json file to share the configuration with your team.

Cursor

Open Settings → Features → MCP Servers → + Add new global MCP server and paste:

{
  "mcpServers": {
    "string-ai": {
      "command": "npx",
      "args": ["-y", "@usestring/mcp"],
      "env": {
        "STRING_AI_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Windsurf

Add to ~/.codeium/windsurf/model_config.json:

{
  "mcpServers": {
    "string-ai": {
      "command": "npx",
      "args": ["-y", "@usestring/mcp"],
      "env": {
        "STRING_AI_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "string-ai": {
      "command": "npx",
      "args": ["-y", "@usestring/mcp"],
      "env": {
        "STRING_AI_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Testing with the MCP Inspector

The MCP Inspector lets you test your server interactively in a browser:

npx @modelcontextprotocol/inspector node build/index.js

Then open http://127.0.0.1:6274, connect via stdio, and try calling each tool from the UI.

How It Works

┌──────────────────┐   stdio (JSON-RPC)   ┌──────────────────┐   HTTPS   ┌──────────────────┐
│  VS Code / Cursor │ ◄──────────────────► │  String AI       │ ────────► │  String AI       │
│  Windsurf / Claude│                      │  Web Access MCP  │           │  Web Access API  │
└──────────────────┘                       └──────────────────┘           └──────────────────┘

1. The IDE spawns this server as a child process and communicates over stdio.
2. When the LLM decides it needs web content, it invokes web_access_fetch or web_access_search.
3. This server forwards the request to String AI's Web Access API (using your API key from the environment) and returns the result to the LLM.

About String AI

String AI provides a powerful web access API that handles proxies, anti-bot measures, and JavaScript rendering automatically. Get your API key at usestring.ai.

License

MIT

Security

Please report security vulnerabilities privately as described in SECURITY.md.