MCP server

Sync Day

io.github.syncday-app/sync-day

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

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

Website

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

8

Token cost

About 3,056 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

25 Oct 2026, 20:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

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

Antigravity

agy mcp add sync-day https://sync.day/mcp/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"sync-day","server_url":"https://sync.day/mcp/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"sync-day","server_url":"https://sync.day/mcp/mcp"}

Tools

• create_event ~645 tokens
  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)
• decide_time ~261 tokens
  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.
• get_event ~195 tokens
  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 de
• parse_event_text ~191 tokens
  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'.
• remove_participant ~233 tokens
  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_availability ~416 tokens
  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.
• update_event ~645 tokens
  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.
• vote_time ~470 tokens
  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 optio

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