Whether current UTC year has Feb 29 is answering right now. Last checked 14 min ago. It exposes 30 tools. Last commit 18 Sep 2026.
Whether current UTC year has Feb 29
Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 18 September 2026. No other catalogue keeps this.
Today is the operative word: we check Whether current UTC year has Feb 29 every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 14 min ago.
claude mcp add leap-day --transport http https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/leap-day/mcp
{
"mcpServers": {
"leap-day": {
"url": "https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/leap-day/mcp"
}
}
}
[mcp_servers.leap-day]
url = "https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/leap-day/mcp"
{
"mcpServers": {
"leap-day": {
"url": "https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/leap-day/mcp"
}
}
}
{
"mcpServers": {
"leap-day": {
"url": "https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/leap-day/mcp"
}
}
}
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
fetch-status
status-catalog
agent-tool-index
browser-url-ok
calc-eval
citation
compatibility
domain-shape
figma-url-shape
file-path-ok
hn-front-count
geo-hint
github-repo-shape
iana-zones
inspect-robots
jira-key-shape
leap-day
search-query-len
lib-docs-hint
memory-key-count
normalize-url
people-search-index
playwright-url-ok
think-steps
timezone
utc-time
validate-json
weather-hint
web-fetch
wiki-title-ok
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/leap-day/mcp | streamable-http | answering | 41 ms | 14 min ago |
Whether the current UTC year is a leap year
Whether current UTC hour is 09-17
UTC end of the current year
Days in current UTC year
Whether current UTC month is US DST-heavy
UTC start of the current year
UTC last day of the current half-year
Whether current UTC month is EU DST-heavy
Answers built from our own checks of this server.