@spawnbase
Basic information
Query your Cloudflare Durable Objects from Claude Code, Cursor, and other AI clients. Read-only SQL access to DO SQLite storage via MCP protocol.
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"durable-objects-mcp": {
"url": "https://your-worker.workers.dev/mcp"
}
}
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Durable Objects MCP is an unofficial MCP server that provides structured, read-only access to Cloudflare Durable Object SQLite storage from AI clients (Claude Code, Cursor, Windsurf, etc.). It allows developers to connect once, discover tables, and execute read-only queries against their DO instances directly from their AI coding assistant.
After adding a query() method to each Durable Object class and deploying the server as a Cloudflare Worker, you connect your MCP client to the Worker’s URL. Authentication happens via Cloudflare Access (OAuth) on first connect. Once connected, you invoke three tools: list_classes (list queryable DO classes), describe_schema (get tables and columns for a DO instance), and execute_read_query (run read-only SQL against a DO instance).
wrangler.jsonc bindingsData Studio only provides manual dashboard access. This MCP server gives AI clients programmatic, read-only SQL query access, enabling automated inspection and debugging directly from your coding environment.
You need a Cloudflare Workers Paid plan, SQLite-backed Durable Objects (compatibility date `2024-04-03` or later), and a Cloudflare Zero Trust account for authentication.
Data stays entirely within Cloudflare’s internal network. The MCP server uses service bindings (`script_name`) to call a `query()` RPC method on each DO instance; there is no public HTTP endpoint to the DOs.
Only `SELECT`, `PRAGMA`, `EXPLAIN`, and `WITH` statements pass through the server-side SQL guard. All write statements (INSERT, UPDATE, DELETE, etc.) are blocked before reaching the DO.
It uses HTTP transport with Cloudflare Access (OAuth) authentication. JWT tokens are verified against CF Access JWKS, and PKCE (S256) is enforced on the MCP client side.
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