Connect Cursor to SignWith (MCP)

Cursor reads MCP servers from an mcp.json file. Steps checked against Cursor's documentation on 1 October 2026.

One-click install

The button opens Cursor and adds SignWith to your MCP servers. When Cursor first connects, it sends you to SignWith to sign in and choose Full access or View only.

Add SignWith with an API key

1. Create a key in Settings → Developers. A test key (sw_test_) keeps your experiments apart from live data.

2. Set it as an environment variable in the shell Cursor starts from:

   ShellCopy bash code

   export SIGNWITH_API_KEY="sw_test_..."
   

3. Add SignWith to ~/.cursor/mcp.json to use it in every project, or to .cursor/mcp.json in one project:

   JSONCopy json code

   {
     "mcpServers": {
       "signwith": {
         "url": "https://app.signwith.co/mcp",
         "headers": { "Authorization": "Bearer ${env:SIGNWITH_API_KEY}" }
       }
     }
   }
   

   ${env:SIGNWITH_API_KEY} reads the variable, so the key isn't saved in the file. Don't commit a key to a shared .cursor/mcp.json.

4. Open Cursor's MCP settings and check that signwith is enabled and lists its tools.

Or add it by hand with OAuth

Leave out headers, and Cursor signs in to SignWith with OAuth when it first connects:

{
  "mcpServers": {
    "signwith": { "url": "https://app.signwith.co/mcp" }
  }
}

What to try

• "List my SignWith templates and show the roles of the lease template."
• "Create a test signature request from my lease template without sending emails, and give me the signing links."
• "Has anyone signed the test request yet?"

By default, Cursor asks before it runs a tool, so nothing is sent without your OK. For the API itself, see the quick start and the API reference.

Troubleshooting

• The server shows an error: check the variable is set in the environment Cursor was started from, then restart Cursor.
• 401 unauthenticated: the key is wrong, revoked or expired. See authentication.
• It can read but not send: the key is read-only. Use a full-access key.

All tools and access rules are on the MCP overview.