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Claude custom connector
A Claude custom connector is a connection you add in Claude to a remote MCP server by pasting its URL. Anthropic uses it for services that are not listed in Claude's Connectors Directory. Once it is connected, Claude can use the service's tools in your chats, for example to send a contract for e-signature through Formify.
How it works in Formify
In Claude (desktop and web):
- Open Customize, then Connectors, and choose Add custom connector.
- Paste the server URL
https://mcp.formify.eu/mcpand select Add. - Select Connect and sign in to Formify.
Try a first prompt such as "List my templates." Claude can then send contracts from templates or PDFs, check who has signed and download the signed copy.
Formify also has a plugin for Claude. You add the marketplace formify-e-sign/formify-skills under Customize, Plugins, and install Formify Core, which includes the connection. The steps are on Formify's MCP page.
In Claude Code, run /mcp add formify https://mcp.formify.eu/mcp and authorize in your browser.
Video
How to connect Formify to Claude
FAQ
How do I add a custom connector in Claude?
Open Customize, then Connectors, choose Add custom connector and paste the server URL. Then select Connect and sign in to the service.
Can Claude send documents for e-signature?
Yes. With Formify connected, Claude can send contracts from templates or PDFs, check who has signed and download the signed copy. The signer signs on Formify's signing page and does not need Claude.
What is the difference between a connector and a plugin in Claude?
A connector is the link to one service. A plugin is a package that can hold connectors, skills and more. Formify's Claude plugin includes the Formify connection.
Related terms
Related pages
- Connect Formify to Claude with MCP
- Formify for developers: MCP server, REST API and agent skills
- Formify's open agent skills on GitHub
- Official source: Anthropic: get started with custom connectors
Last reviewed: 22 October 2026
