API & MCP

Everything a person can do on Timeslice, a program or AI agent can do with the same inputs and get the identical result.

HTTP API

• GET https://timeslice.usefulweb.app/api/v1/tools – catalog
• GET https://timeslice.usefulweb.app/api/v1/tools/{id} – inputs, output schema, examples
• POST https://timeslice.usefulweb.app/api/v1/tools/{id}/calculate – run a tool
• GET https://timeslice.usefulweb.app/api/v1/workflows · POST https://timeslice.usefulweb.app/api/v1/workflows/{id}/run
• OpenAPI 3.1: /openapi.json · /openapi.yaml
• Errors: application/problem+json; 422 includes per-field errors.

Tools on Timeslice

• Timeslice Timesheet Summary – Paste a timesheet: hours per project, task, tag or client, per day and week, billable sums. timeslice_timesheet_summary
• Timeslice Duration & Time Range Parser – Turn 1h30, 90m, 1:30, 9-10:30 or 9am to 1pm into h:mm, decimal hours and ISO 8601. timeslice_duration_parser
• Timeslice Timesheet Overlap Check – Find time entries that overlap, the hours counted twice and gaps in each day of a timesheet. timeslice_overlap_check

Every result contains

inputs (normalised, defaults applied), summary, result (validated against the published schema), units, assumptions, sources, warnings, computedAt and links.

MCP (Model Context Protocol)

• Streamable HTTP endpoint: https://timeslice.usefulweb.app/mcp – protocol revisions 2026-07-28 (stateless) and 2025-11-25 / 2025-06-18 / 2025-03-26 (initialize handshake).
• Tools: timeslice_timesheet_summary, timeslice_duration_parser, timeslice_overlap_check
• Local stdio connector: node src/mcp-stdio.ts

{
  "mcpServers": {
    "usefulweb": { "type": "http", "url": "https://timeslice.usefulweb.app/mcp" }
  }
}