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Doubling/halving time from a periodic growth rate: rule-of-70/72/69.3 estimate vs exact discrete and continuous times, with a milestone table.
Call this tool from your code in three languages.
curl -X POST 'http://127.0.0.1:3003/en/api/tools/population-doubling-time-rule70' \
-H 'Content-Type: application/json' \
-d '{"ratePct":7,"ruleNumerator":"70","initialValue":100}'Send a POST request with your inputs as JSON. File parameters require a separate upload first.
POST http://127.0.0.1:3003/en/api/tools/population-doubling-time-rule70| Name | Type | Required | Description |
|---|---|---|---|
| ratePct | number | Yes | Compound rate per period (years, generations, minutes…). Negative rates compute half-life instead of doubling time. |
| ruleNumerator | select | Yes | — |
| initialValue | number | Yes | Starting amount for the milestone table (population, currency, biomass — any unit). |
JSON result
{
"key": {...},
"metadata": {
"key": "value"
},
"error": "Error message (optional)",
"message": "Notification message (optional)"
}Add this tool to your Model Context Protocol server so AI agents can list and call it.
Add this block to your MCP client configuration:
{
"mcpServers": {
"elysiatools-population-doubling-time-rule70": {
"name": "population-doubling-time-rule70",
"description": "Doubling/halving time from a periodic growth rate: rule-of-70/72/69.3 estimate vs exact discrete and continuous times, with a milestone table.",
"baseUrl": "http://127.0.0.1:3003/mcp/sse?toolId=population-doubling-time-rule70",
"command": "",
"args": [],
"env": {},
"isActive": true,
"type": "sse"
}
}
}After connecting to the SSE endpoint, list the exposed tools:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/list"
}Invoke the tool by its id, passing arguments built from its parameters:
{
"jsonrpc": "2.0",
"id": 2,
"method": "tools/call",
"params": {
"name": "population-doubling-time-rule70",
"arguments": {
"ratePct": 7,
"ruleNumerator": "70",
"initialValue": 100
}
}
}Questions or issues? Contact [email protected]