The solo preview Slack workspace the gantry fleet posts to is on the free plan, and Slack's unpublished anti-spam cap on app-posted messages tripped at ~09:20-10:45 UTC on 2026-07-28. Every write API returns message_limit_exceeded workspace-wide while reads keep working. Re-probes at 16:10 and 20:41 UTC (~10-11h after the trip) still fail — at current volume this is chronic, not a transient throttle.
Volume evidence (14 days to 2026-07-28, channel roots only — thread replies uncounted, so real totals are higher):
- 3,852 bot messages ≈ 275/day; the trip day was pacing ~2× that.
- Top sources are the fleet's own event mirrors, not the loop reports:
#gantry-runs 1,755, #portcullis 1,031 (~72% combined), #loop-* ≈ 800.
Recommendation (pick one):
- Trim the
#gantry-runs / #portcullis mirrors — batch them or mirror failures only. Cheapest, and removes ~72% of volume.
- Upgrade the workspace to a paid plan.
Until then, workers fall back to PR comments / run results for delivery — the slack skill now fails fast with exactly that guidance on this error (#80, merged). Diagnosis details: triage run, original report from primal-polite-cedar.
via gantry
The solo preview Slack workspace the gantry fleet posts to is on the free plan, and Slack's unpublished anti-spam cap on app-posted messages tripped at ~09:20-10:45 UTC on 2026-07-28. Every write API returns
message_limit_exceededworkspace-wide while reads keep working. Re-probes at 16:10 and 20:41 UTC (~10-11h after the trip) still fail — at current volume this is chronic, not a transient throttle.Volume evidence (14 days to 2026-07-28, channel roots only — thread replies uncounted, so real totals are higher):
#gantry-runs1,755,#portcullis1,031 (~72% combined),#loop-*≈ 800.Recommendation (pick one):
#gantry-runs/#portcullismirrors — batch them or mirror failures only. Cheapest, and removes ~72% of volume.Until then, workers fall back to PR comments / run results for delivery — the slack skill now fails fast with exactly that guidance on this error (#80, merged). Diagnosis details: triage run, original report from primal-polite-cedar.
via gantry