Sync Day MCP Server

by syncday-app Your server? Claim it

not responding

Sync Day is listed as active in the registry but did not answer our last check. It exposes 8 tools.

Free no-signup group scheduling; share a link and rank times by who's free.

Uptime history 64 days of history · worst day 0%

64 days agonow

0.0%

Uptime 24h

0 of 91 checks

Tools

read from the server

169 ms

Response time

average over 24h

open, no key

Access

streamable-http

Sync Day does not always answer

Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add sync-day --transport http https://sync.day/mcp/mcp

Settings → Connectors → Add custom connector, then paste this address

https://sync.day/mcp/mcp

~/.codex/config.toml

[mcp_servers.sync-day]
url = "https://sync.day/mcp/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "sync-day": {
      "url": "https://sync.day/mcp/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "sync-day": {
      "type": "http",
      "url": "https://sync.day/mcp/mcp"
    }
  }
}

Available tools 8

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

event

create_event

Create a sync.day availability poll and get its share link. Candidate days run from startDate to endDate (inclusive; or give days instead). Each day offers candidate START times from hourFrom, every startStepMinutes, as long as start + durationMinutes <= hourTo. Returns slug, public url (share this), adminUrl and adminKey (keep private; needed for update_event / remove_participant). Example: 周六周日下午聚餐 3 小时 -> {title:'周末聚餐', startDate:'2026-09-05', endDate:'2026-09-06', hourFrom:13, hourTo:18, durationMinutes:180, startStepMinutes:60}.

get_event

Read an event: settings, every candidate start key per day (startOptions), who has answered (participants with their start keys; names may repeat), the top 10 start times by head-count (ranked), the starts EVERYONE with picks can make with their votes (voteOptions), each person's vote (votes) and decidedStart. No key needed.

update_event

Organiser only: change any event settings (same fields and rules as create_event; omitted fields keep their current value; endDate wins over days). Existing picks are kept; those no longer valid starts are just hidden.

decide

decide_time

Organiser only: settle on a start time (locks availability picking and voting; the page shows 已定). Pass start=null to reopen. Requires the adminKey from create_event.

parse

parse_event_text

Turn a natural-language sentence (Chinese works best) into create_event input using sync.day's AI parser. Does NOT create anything; review the result, then call create_event. Example: '下周六或周日下午聚餐，大概 3 小时'.

participant

remove_participant

Organiser only: remove one participant by name (the oldest row with that name when it repeats), together with their vote. Requires the adminKey from create_event.

submit

submit_availability

Save (or replace) one person's availability: the candidate start keys they can make, from get_event.startOptions. The person is identified by `identity`, not by name: the same identity later overwrites the same row (and can rename it), a different identity with the same name is a second participant. Keys outside the event's start options are rejected. Returns the updated ranking.

vote

vote_time

Approval voting: set every start one person accepts (replaces their earlier approvals; an empty list clears them). The voter is the `identity` used in submit_availability and must have at least one start saved. Only keys listed in get_event.voteOptions are accepted; the error lists the current options otherwise. Rejected once the organiser decided. Example: {slug:'calm-otter-4821', identity:'3f9a1c77b2e04d5e8a61f0c9d2b7e415', starts:['2026-09-05T15:00','2026-09-06T10:00']}. `start` is shorthand for a single-item `starts`.

Endpoints

URL	Transport	State	Latency	Checked
https://sync.day/mcp/mcp	streamable-http	answering	169 ms	12 min ago

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Sync Day — questions

Answers built from our own checks of this server.

What can Sync Day do?

It exposes 8 tools, read directly from the server on our last check. Among them: create_event, decide_time, get_event, parse_event_text, remove_participant, submit_availability and 2 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Sync Day working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 91 checks got a reply (0.0%), average response time 169 ms. The bar chart above shows every period we have measured.

The registry lists Sync Day as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect Sync Day?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Sync Day need an API key?

No. Sync Day completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 8 of them are readable on this page. This is what we observed, not what the docs claim.