Whenna for agents & developers

Everything a human does by tapping, an AI agent can do with one tool call — create a plan, mark availability, read the best time, lock it in. No API keys.

MCP: https://whenna.com/mcp llms.txt openapi.json

MCP (recommended)

Streamable-HTTP, stateless, JSON-RPC 2.0, no auth. Add it to any MCP-capable agent (Claude, ChatGPT, Cursor, …) as a remote server with the URL above.

curl -X POST https://whenna.com/mcp -H 'Content-Type: application/json' -d '{
  "jsonrpc":"2.0","id":1,"method":"tools/call","params":{
    "name":"whenna_create_plan","arguments":{
      "title":"Team dinner","days":["2026-07-10","2026-07-11"],
      "start_hour":18,"end_hour":22,"timezone":"America/Chicago"}}}'

Tool	Does
`whenna_create_plan`	Create a plan → share `url` + private `creator_key`
`whenna_get_plan`	Full state: participants, ranged availability, best times, final lock
`whenna_mark_availability`	Set a participant's free ranges (`{day, from, to}`)
`whenna_best_times`	Ranked blocks where the most people are free, with names
`whenna_lock_time`	Confirm the final time (creator_key) → calendar links for everyone

REST

Endpoint	Does
`POST /api/meetings`	Create → `{id, creatorKey}`
`GET /api/meetings/:id`	Plan state (JSON)
`PUT /api/meetings/:id/availability`	Set someone's slots
`GET /api/meetings/:id/best`	Ranked best time blocks
`PUT /api/meetings/:id/final`	Lock / unlock the final time
`GET /api/meetings/:id/event.ics`	Calendar file (TZID-correct)
`GET /api/meetings/:id/stream`	Live updates (SSE)

Humans answer at https://whenna.com/o/<id> — send them the link and the two worlds meet on the same live grid.