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`mcpctl get instances` showed all eight servers healthy while the UniFi one
had never once reached its controller. The default probe is `tools/list`,
which MCP servers answer from a static in-process table — no credentials, no
upstream, ~3ms. It cannot fail for any reason the user cares about, so it was
reporting `healthy` for every process that managed to start.
Split the two passes:
healthy — readiness: `tools/call` on `healthCheck.tool`. The upstream
answered, so the server can actually do its job.
live — liveness: `tools/list` only. Process up, upstream unverified.
`live` is now the default for any server without a `healthCheck.tool`. It is
not a warning; it is an admission that nothing is watching that server. Probe
events name which probe ran and which tool ("Readiness check (list_sites)
passed"), so the events log distinguishes the two after the fact.
Also:
- `healthCheck.tool` is optional now, so the timings can be tuned without
inventing a readiness probe.
- `create server --health-check-tool/-args/-interval/-timeout/
-failure-threshold`, per the rule that everything applyable is a create
flag. Merges over a `--from-template` healthCheck rather than replacing it.
- `describe instance` explains a `live` verdict instead of leaving it cryptic.
- create.ts held a raw NUL byte in a string literal, which made grep treat the
whole file as binary and silently skip it. Escaped as `\0`.
Verified against the live fleet: with readiness probes configured, my-grafana
went unhealthy (Grafana API 403) and my-node-red degraded (connect timeout to
a Tailscale address) — both had read healthy for months.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0114dg56YmVacyqhp5fitcTb
20 KiB
20 KiB