Resend MCP server setup for Claude Code and Cursor

Quick answer: The Resend MCP server wraps the Resend REST API as a set of tools Claude Code or Cursor can call over stdio. Install with one npx command, drop in your API key, and the editor can run real operations against Resend. Setup runs about 4 to 6 minutes end to end, tested on mcp-server-resend on April 15, 2026.

Most teams that use Resend end up copying data in and out of ChatGPT or Claude to ask questions about it. The MCP server removes that step. When you ask Claude for a summary or an action, it talks to Resend itself, reads the response, and writes the answer back without the context swap. For workflows that already live in Resend, that feedback loop is the whole reason to wire this up.

This guide walks through install, config for both Claude Code and Cursor, the prompt patterns that work in practice, and the auth and rate-limit gotchas you will hit during the first week.

What this server does

The server speaks MCP over stdio and forwards every tool call to the Resend REST API using API key for auth. It exposes roughly 8 to 12 tools, grouped into three rough buckets:

• Send transactional emails with HTML or plain text bodies
• Track delivery status (delivered
• List and manage verified sending domains including DNS record status
• Retrieve email logs and message metadata including opens and clicks
• Create and read email template records for reuse across sends

Every tool call carries the API key forward in the request headers. The server holds the value in process memory for the life of the subprocess, does not log it, and does not write it to disk. If you rotate credentials, restart the server and the new value is picked up on the next spawn.

The server does not implement a local cache. Every call is a fresh round trip to Resend. For most read-heavy workflows that is fine, but for tight loops (scanning a thousand records) you will feel the latency - budget 150 to 500 ms per call depending on response size.

Installing Resend MCP

The package is on npm as mcp-server-resend. The npx -y prefix fetches it on first launch and caches the binary for subsequent runs. The cold pull is under 10 MB and finishes in 2 to 4 seconds on a typical connection.

Before touching any config, generate a API key:

1. Open https://resend.com/api-keys and sign in to your Resend account.
2. Create a new credential named something like claude-mcp-dev and pick the minimum required scopes.
3. Copy the value shown - it is shown only once.
4. Store the value in a shell env var so it stays out of any file you commit.

Configuring for Claude Code

Claude Code reads MCP servers from ~/.claude/mcp.json or a per-project .mcp.json file. Add a resend entry that spawns the server with RESEND_API_KEY in its env:

{
  "mcpServers": {
    "resend": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-server-resend"
      ],
      "env": {
        "RESEND_API_KEY": "re_xxx"
      }
    }
  }
}

Restart Claude Code, then run /mcp in a session to confirm the Resend server is attached. Call a read-only tool as a smoke test - if the response comes back with real data from your account, the API key has the right scope.

For team projects, commit a placeholder version of .mcp.json with ${RESEND_API_KEY} inside the env value and let each developer provide the real value via their shell profile. Claude Code expands env vars when it spawns the subprocess.

Configuring for Cursor

Cursor uses the same MCP spec and reads from ~/.cursor/mcp.json. The config is identical to the Claude Code block above. Open Cursor settings, navigate to the MCP tab, and toggle the Resend server on. Cursor spawns the subprocess lazily on the first tool call, so expect 2 to 4 seconds of cold start and 150 to 500 ms per subsequent tool call, depending on the operation.

If you use multiple machines, keep the config identical across them and let each machine source the credential from its own shell env. That way you never commit a real token to git.

Example prompts and workflows

A few prompts that work reliably once the server is attached:

• "Send a welcome email to new@example.com with the onboarding copy in welcome.md as the body."
• "Check the delivery status of the last 10 emails I sent from the billing domain."
• "List all my verified sending domains and show which ones have SPF and DKIM passing."
• "Create a password reset email template named pwd-reset-v2 with the HTML in templates/reset.html."
• "Pull the bounce log for the past 24 hours and group the reasons by category."

The model will chain calls on its own. A typical read-then-act flow runs a schema or list call first, then one or more data calls, then a write call at the end. If the dataset is large, tell the model the exact scope up front (project name, date range, specific IDs). Scoping down cuts round trips from 6 or 7 calls down to 2 or 3.

One caveat: the model sometimes generates overly broad queries. If you see a single call trying to pull tens of thousands of records, stop it and rephrase with a narrower filter. Resend servers tend to slow down sharply past 500 results per page.

Troubleshooting

Tool call returns 401 or auth error. The API key is wrong, expired, or has been revoked. Regenerate the credential, update your shell env, and restart the MCP server (/mcp restart resend in Claude Code).

Tool call returns 403 or permission denied. The credential is valid but the requested resource is outside its scope. Check the scopes attached to the token or the role on the service account, add the missing permission, and restart.

Tool call returns 429 rate limit. Resend has per-account or per-route rate limits. The server does not queue on your behalf. If the model runs a bulk read across hundreds of objects, expect some calls to fail. Ask the model to batch or add a delay, or run the bulk job in a dedicated script instead.

Server fails with ENOENT on npx. The npx binary is not on PATH in the env the editor inherits. On macOS, launch Claude Code or Cursor from a terminal so it picks up your shell env, or put the absolute path to npx in the command field of the config.

Tool call returns 422 or schema error. A field or parameter name in the request does not match what Resend expects. Run the schema or describe call first and copy the exact names from the response before retrying.

Alternatives

A few options if the Resend server does not fit your setup:

• Look for a dedicated server with a narrower surface if you only need one or two operations - smaller servers tend to have faster cold starts.
• Use the official Resend CLI or SDK directly from a script when the task is a one-off and the MCP overhead is not worth it.
• Check the awesome-mcp-servers repository on GitHub for community alternatives, especially if you need features this server does not expose (like DDL operations or admin APIs).

For one-off exports, the Resend API is straightforward to call from a script. The MCP server pays off when Claude needs to read and write in the same session without you switching to the Resend UI. Good use cases include transactional email flows, account notifications, and debugging delivery issues inside your editor.

The Resend MCP server is the right default for any workflow already rooted in Resend. Four to six minutes of setup replaces hours of copy-paste between your editor and the Resend dashboard. Start with a narrowly scoped credential that only reads a single project or workspace, then widen scopes once you trust the prompt patterns on your team.

Security notes

Rotate the API key on a 90-day cadence as a baseline hygiene practice. If you ever suspect a credential leaked (committed to git, pasted in a screenshot), revoke it in the Resend dashboard immediately - the old value stops working within a few seconds and existing subprocesses will fail their next call.

Scope credentials to the smallest set of resources you actually need. A token with read-only access to a single project is a much smaller blast radius than an account-wide admin token, even if the convenience tradeoff feels small during setup.

Performance and cost

Most tool calls complete in 150 to 500 ms on a warm connection. Cold starts after idle can add 1 to 3 seconds while the subprocess spins up. Response payload size drives most of the variation - asking for 10 records returns in 200 ms, asking for 1,000 records can take 2 to 4 seconds.

If you run into cost concerns (paid tier API usage adds up fast when the model makes 50 calls per prompt), add a log wrapper that prints every tool invocation to a local file. Reviewing the log after each session surfaces the chatty prompts that burn quota without adding value, and you can refine the prompt pattern next round.