Probe a list of domains with a real content check per domain, so a suspended deployment or a broken build that still returns HTTP 200 is caught, and alert only when a domain changes state. Use when asked to monitor uptime, watch production domains, set up a health check, or work out why a site looked up but was not.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Domain Uptime Monitor
## The failure this exists for
HTTP 200 is not proof a site is working:
- A suspended or payment-disabled deployment serves a billing page with 200.
- A broken build serves an empty shell with 200.
- A partial deploy serves the old page while the API behind it is gone.
- A misconfigured origin leaves the marketing page at 200 while every signed-in
action fails.
A monitor that checks the status code reports all four as healthy. Every domain
here declares what a working response actually contains.
## Prerequisites
- Python 3.9 or later, standard library only.
- Outbound HTTPS to the domains you list.
- **No credential is needed to detect.** Email alerting is optional and needs a
[Resend](https://resend.com) API key in `RESEND_API_KEY` and a sender domain
verified on that account. Without the key, detection still runs and the report
is still written; only the send is skipped. `--no-email` turns sending off
explicitly.
`notify_email` has no default and will not get one. Ask the user for the address.
## Writing the config
Start from [`examples/domains.example.json`](examples/domains.example.json). Each
…
The line at the top of this page pins the label git:20260918.9cffd68, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_nmuygnbnkul7yqx5
GET https://markdownregistry.com/api/v1/resolve?ref=getedgehq/skills/domain-uptime-monitor
GET https://markdownregistry.com/api/v1/blob/fc00e3342e57e3c4b1e25b3aa74e578fcca5a7550b5442797a4668e178d90482
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getedgehq/skills · evals/skillneed/2026-09-19/skillneed-catalog-routing-v2/s3/without/catalog/domain-uptime-monitor/SKILL.md · Monitor domains with a real content check per domain and alert only when a domain changes state.
getedgehq/skills · evals/skillneed/2026-09-19/skillneed-catalog-routing-v2/s1/with/catalog/domain-uptime-monitor/SKILL.md · Monitor domains with a real content check per domain and alert only when a domain changes state.
getedgehq/skills · evals/skillneed/2026-09-19/skillneed-catalog-routing/s1/with/catalog/domain-uptime-monitor/SKILL.md · Monitor domains with a real content check per domain and alert only when a domain changes state.
getedgehq/skills · evals/skillneed/fixtures/skillneed-catalog-routing/catalog/domain-uptime-monitor/SKILL.md · Monitor domains with a real content check per domain and alert only when a domain changes state.
getedgehq/skills · evals/skillneed/2026-09-19/skillneed-catalog-routing/s1/without/catalog/domain-uptime-monitor/SKILL.md · Monitor domains with a real content check per domain and alert only when a domain changes state.
getedgehq/skills · evals/skillneed/2026-09-19/skillneed-catalog-routing-v2/s2/without/catalog/domain-uptime-monitor/SKILL.md · Monitor domains with a real content check per domain and alert only when a domain changes state.
getedgehq/skills · evals/skillneed/2026-09-19/skillneed-catalog-routing/s3/without/catalog/domain-uptime-monitor/SKILL.md · Monitor domains with a real content check per domain and alert only when a domain changes state.
getedgehq/skills · evals/skillneed/2026-09-19/skillneed-catalog-routing/s3/with/catalog/domain-uptime-monitor/SKILL.md · Monitor domains with a real content check per domain and alert only when a domain changes state.
