Open source: the tools are open, the server stays closed

What connects Escouade Mail is open, under the MIT licence. The server enforces the sending rules: it stays closed.

GitHub organisation: https://github.com/escouade-io

Seven repositories, produced from the server’s registry.

They are online on the escouade-io GitHub organisation. They only work with an Escouade Mail key.

Repository	What it holds	Status
`escouade-mail-mcp`	How to connect the MCP server, client by client, with configuration files ready to copy. The server contract: every tool, its schemas, its access.	public
`escouade-mail-python`	One method per server operation, same names and arguments as the MCP tools. No dependencies. Package: PyPI: escouade-mail.	public
`escouade-mail-node`	The same operations, typed, for Node. No dependencies. Package: npm: escouade-mail.	public
`escouade-mail-cli`	One command per operation, from a terminal or from an agent that runs commands. Results and refusals in JSON. Package: npm: escouade-mail-cli.	public
`escouade-mail-skills`	Seven recipes in the Agent Skills format: get started, write, follow replies, approve drafts, send from your domain, prospect, call the API.	public
`escouade-mail-plugins`	The MCP server, the key and the recipes, installed at once in Claude Code.	public
`escouade-mail-examples`	Five examples to run, in Python and for Node: sign up, write, read replies, connect your domain, approve.	public
server	The server: sending rules, send queue, bounces.	private

A registry of operations, and its projections.

The server keeps a registry of operations: a name, a description, an input schema, an output schema, a permission. The MCP tools, the HTTP API, /llms.txt and /openapi.json come out of it.

The open repositories are produced from that same registry. A tool can neither invent an operation nor forget one.

Text

registry of operations   server, closed
│
├─ MCP              /mcp · /connect
├─ HTTP             POST /v1/{operation}
├─ for agents       /llms.txt · /openapi.json
│
└─ open tools       github.com/escouade-io
   MCP · Python SDK · TypeScript SDK
   command line · skills
   Claude Code plugin · examples

These two references can be read without a key: https://api.subagent.fr/llms.txt and https://api.subagent.fr/openapi.json.

The sending rules stay on the server. The rest is open.

Open: what you paste on your side (MCP configuration, SDKs, command line, skills, plugin, examples).
Closed: what decides whether an e-mail leaves (warm-up, daily quota, working hours, human approval, unsubscribe, circuit breaker).
Licence: MIT, for every open repository.
Condition: an Escouade Mail key. The tools only work with the service.

See also: Connect my agent · Documentation · llms.txt