io.github.syncday-app/sync-day
Description
Free no-signup group scheduling; share a link and rank times by who's free.
What our measurements say
io.github.syncday-app/sync-day is a remote MCP server published at sync.day. It has been probed 6 times since 9/12/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 648 ms, a delay an agent will notice. It offers a narrow, focused set of 8 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Agent readability score
Sign up free to generateEvent narrative
Risk: low
Advice
Raw observations
| Run | Era | Modern | ms | Legacy | ms | Versions |
|---|---|---|---|---|---|---|
| 2026-09-13 01:33:33 | Dual-era | 200 | 590 | 200 | 637 | 2026-07-28 |
| 2026-09-12 23:31:36 | Dual-era | 200 | 520 | 200 | 484 | 2026-07-28 |
| 2026-09-12 21:29:15 | Dual-era | 200 | 1266 | 200 | 1332 | 2026-07-28 |
| 2026-09-12 19:27:29 | Dual-era | 200 | 752 | 200 | 646 | 2026-07-28 |
| 2026-09-12 17:24:09 | Dual-era | 200 | 648 | 200 | 623 | 2026-07-28 |
| 2026-09-12 15:21:42 | Dual-era | 200 | 1519 | 200 | 1500 | 2026-07-28 |
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 244ms → warm 191ms (penalty 53ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
create_eventCreate 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}.
titlestringrequiredquestionstringstartDatestringrequiredendDatestringdaysintegerhourFromintegerrequiredhourTointegerrequireddurationMinutesrequiredstartStepMinutes
parse_event_textTurn 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'.
textstringrequiredtodaystring
get_eventRead 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.
slugstringrequired
submit_availabilitySave (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.
slugstringrequiredidentitystringrequirednamestringrequiredstartsarrayrequired
remove_participantOrganiser 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.
slugstringrequirednamestringrequiredadminKeystringrequired
update_eventOrganiser 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.
slugstringrequiredadminKeystringrequiredtitlestringquestionstringstartDatestringendDatestringdaysintegerhourFromintegerhourTointegerdurationMinutesstartStepMinutes
vote_timeApproval 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`.
slugstringrequiredidentitystringrequiredstartsarraystartstring
decide_timeOrganiser 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.
slugstringrequiredadminKeystringrequiredstartrequired
Availability history
Each block is one measurement round. Green: working response. Amber: responded but the server was returning errors (5xx). Red: no response at all.
Era history
Each cell is one probe run. Faded cells are incomplete probes — one leg did not answer, so the era is inconclusive.
Response time history
The two probe legs separately: modern server/discover and legacy initialize.
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Dual-era
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[](https://mcpmetrics.io/servers/io-github-syncday-app-sync-day)<a href="https://mcpmetrics.io/servers/io-github-syncday-app-sync-day"><img src="https://mcpmetrics.io/badge/io.github.syncday-app/sync-day/era.svg" alt="mcpmetrics"></a>You are seeing the last 7 days. Sign up for the full history. Which check failed and why is in the dashboard.
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