Provably correct day-count and accrued-interest calculations. A small, dependency-light TypeScript library and an MCP server, so an AI agent can get the exact number instead of guessing.
Server Config
{
"mcpServers": {
"shikamaru": {
"command": "npx",
"args": [
"-y",
"--package=@jayofemi/shikamaru",
"shikamaru-mcp"
]
}
}
}