Retain So runs on your own machine — the client starts it, so there is no endpoint to ping. 31 installs a week from npm. Last commit 8 Aug 2026.
Model Context Protocol server for Retain: let AI agents query churn risk and act on retention.
Nothing serious here today
Today is the operative word: we check Retain So every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add mcp-server -e 'RETAIN_API_KEY=<RETAIN_API_KEY>' -- npx -y @retain-so/mcp-server{
"mcpServers": {
"mcp-server": {
"command": "npx",
"args": [
"-y",
"@retain-so/mcp-server"
],
"env": {
"RETAIN_API_KEY": "<RETAIN_API_KEY>"
}
}
}
}[mcp_servers.mcp-server]
command = "npx"
args = ["-y", "@retain-so/mcp-server"]
env = { RETAIN_API_KEY = "<RETAIN_API_KEY>" }{
"mcpServers": {
"mcp-server": {
"command": "npx",
"args": [
"-y",
"@retain-so/mcp-server"
],
"env": {
"RETAIN_API_KEY": "<RETAIN_API_KEY>"
}
}
}
}{
"servers": {
"mcp-server": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@retain-so/mcp-server"
],
"env": {
"RETAIN_API_KEY": "<RETAIN_API_KEY>"
}
}
}
}Put your own value in place of
<RETAIN_API_KEY> (Your API key from Retain).
The author’s registry entry marks it as required.
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Retain So — questions
Answers built from our own checks of this server.