Relativistic navigation calcs for agents: time dilation, trip planning, chronometry, gamma.
Connect Runs on your machine
claude mcp add nav-substrate -e NAV_SERVICE_API_KEY=<NAV_SERVICE_API_KEY> -e NAV_SERVICE_URL=<NAV_SERVICE_URL> -e NAV_SERVICE_LOCAL=<NAV_SERVICE_LOCAL> -- uvx nav-substrate-mcp==0.1.1
{
"mcpServers": {
"nav-substrate": {
"command": "uvx",
"args": [
"nav-substrate-mcp==0.1.1"
],
"env": {
"NAV_SERVICE_API_KEY": "<NAV_SERVICE_API_KEY>",
"NAV_SERVICE_URL": "<NAV_SERVICE_URL>",
"NAV_SERVICE_LOCAL": "<NAV_SERVICE_LOCAL>"
}
}
}
}
{
"mcpServers": {
"nav-substrate": {
"command": "uvx",
"args": [
"nav-substrate-mcp==0.1.1"
],
"env": {
"NAV_SERVICE_API_KEY": "<NAV_SERVICE_API_KEY>",
"NAV_SERVICE_URL": "<NAV_SERVICE_URL>",
"NAV_SERVICE_LOCAL": "<NAV_SERVICE_LOCAL>"
}
}
}
}
{
"servers": {
"nav-substrate": {
"type": "stdio",
"command": "uvx",
"args": [
"nav-substrate-mcp==0.1.1"
],
"env": {
"NAV_SERVICE_API_KEY": "<NAV_SERVICE_API_KEY>",
"NAV_SERVICE_URL": "<NAV_SERVICE_URL>",
"NAV_SERVICE_LOCAL": "<NAV_SERVICE_LOCAL>"
}
}
}
}
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 |
|---|---|
NAV_SERVICE_API_KEYOptional | Your Nav Substrate API key (or 'demo'). |
NAV_SERVICE_URLOptional | Base URL of the hosted API. |
NAV_SERVICE_LOCALOptional | Set to 1 to run the calc core in-process (offline, no metering). |
Details
| Package | [email protected] (PYPI, stdio) |
| First published | 9 Sep 2026 |
| Last updated | 9 Sep 2026 |
| Registry name | io.github.Wchampe/nav-substrate |
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