Give an agent a calendar it can book without double-booking: find, hold, then commit atomically.
Connect Runs on your machine
claude mcp add deltat -e DELTAT_PASSWORD=<DELTAT_PASSWORD> -e DELTAT_HOST=<DELTAT_HOST> -e DELTAT_PORT=<DELTAT_PORT> -e DELTAT_DATABASE=<DELTAT_DATABASE> -e DELTAT_USER=<DELTAT_USER> -e DELTAT_TLS=<DELTAT_TLS> -e DELTAT_TLS_CA=<DELTAT_TLS_CA> -- npx -y @open-deltat/[email protected]{
"mcpServers": {
"deltat": {
"command": "npx",
"args": [
"-y",
"@open-deltat/[email protected]"
],
"env": {
"DELTAT_PASSWORD": "<DELTAT_PASSWORD>",
"DELTAT_HOST": "<DELTAT_HOST>",
"DELTAT_PORT": "<DELTAT_PORT>",
"DELTAT_DATABASE": "<DELTAT_DATABASE>",
"DELTAT_USER": "<DELTAT_USER>",
"DELTAT_TLS": "<DELTAT_TLS>",
"DELTAT_TLS_CA": "<DELTAT_TLS_CA>"
}
}
}
}{
"mcpServers": {
"deltat": {
"command": "npx",
"args": [
"-y",
"@open-deltat/[email protected]"
],
"env": {
"DELTAT_PASSWORD": "<DELTAT_PASSWORD>",
"DELTAT_HOST": "<DELTAT_HOST>",
"DELTAT_PORT": "<DELTAT_PORT>",
"DELTAT_DATABASE": "<DELTAT_DATABASE>",
"DELTAT_USER": "<DELTAT_USER>",
"DELTAT_TLS": "<DELTAT_TLS>",
"DELTAT_TLS_CA": "<DELTAT_TLS_CA>"
}
}
}
}{
"servers": {
"deltat": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@open-deltat/[email protected]"
],
"env": {
"DELTAT_PASSWORD": "<DELTAT_PASSWORD>",
"DELTAT_HOST": "<DELTAT_HOST>",
"DELTAT_PORT": "<DELTAT_PORT>",
"DELTAT_DATABASE": "<DELTAT_DATABASE>",
"DELTAT_USER": "<DELTAT_USER>",
"DELTAT_TLS": "<DELTAT_TLS>",
"DELTAT_TLS_CA": "<DELTAT_TLS_CA>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
DELTAT_PASSWORDRequired, secret | Password for the deltat server. Required; there is no default. |
DELTAT_HOSTOptional | Hostname of the deltat server. |
DELTAT_PORTOptional | Port deltat listens on. |
DELTAT_DATABASEOptional | Tenant to connect to. Each database name is an isolated tenant. |
DELTAT_USEROptional | Username presented at connect time. |
DELTAT_TLSOptional | on to encrypt the connection and verify deltat's certificate. Unset means off unless DELTAT_TLS_CA is set; without TLS the password is sent in the clear, so use it for any deltat that is not on this machine. |
DELTAT_TLS_CAOptional | Path to a PEM certificate to trust instead of the system's authorities, for a deltat with a self-signed certificate. Implies DELTAT_TLS=on. |
Details
| Package | @open-deltat/[email protected] (NPM, stdio) |
| First published | 4 Oct 2026 |
| Last updated | 4 Oct 2026 |
| Registry name | io.github.open-deltat/deltat |
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