INCIDENT REVIEW
DEVIN_IMAGE_EDIT_THREAD
26 JUL 2026 · HST
ForgeBot Slack Diagnostic

Valid Requests Died Before the Agent Started

Root-Cause Confidence
MEDIUM

The failure layer is proven. The exact silent-return branch is not, because rejected events were not logged with a reason.

Primary Finding
This was an ingress failure, not an image-generation failure.

Slack stored Devin’s valid first-token mentions and showed ForgeBot check marks, but four work requests never reached the gateway’s agent-start path. No model call, image edit, response, or outbound send was attempted for those turns.

Thread Timeline

04:13:43 HST
Dropped

Original image-edit brief with three image attachments.

Check mark; no inbound log
04:50:55 HST
Dropped

“Please complete this request.”

Check mark; no inbound log
05:49:19 HST
Dropped

“Please increase your effort … and complete the request.”

Check mark; no inbound log
06:31:28 HST
Processed

“Please confirm you are active.”

Agent started; reply in 12.0s
06:32:09 HST
Dropped

“Okay, please continue.”

Check mark; no inbound log
08:27:20 HST
Processed

Adam’s arithmetic probe.

Reply in 7.3s

Evidence

Slack Source

Five Valid Mentions

Every missed work turn begins with the exact ForgeBot mention. The thread contains the original three files and complete edit instructions.

Gateway Record

No Agent Start

The gateway has no inbound-message, model-response, or send record for the four dropped turns. The confirmation and arithmetic probes do appear.

Current Health

All Read Checks Pass

The live self-test passes runtime tooling, credentials, ForgeBot Slack identity, channel access, thread reads, image-generation readiness, and clean-preview readiness.

What This Rules Out

Working

  • ForgeBot Slack authentication and channel membership
  • Thread reads and outbound replies
  • Model round trips on this thread
  • Image-generation tooling readiness

Broken Behavior

  • A valid mention can be silently discarded before the agent begins
  • The check mark can falsely imply successful processing
  • The drop path records no reason, blocking exact branch attribution
  • No automatic replay recovers missed work

Required Repair

  1. Instrument every Slack ingress rejection. Record the message timestamp and safe reason code for authorization, ownership, deduplication, and mention-gate returns.
  2. Fix success telemetry. Do not leave a completion check mark unless an agent run started and produced a verified reply or artifact.
  3. Add the exact regression case. Test a root mention with multiple images, repeated mentioned follow-ups, a successful reply, then another follow-up in the same thread.
  4. Replay Devin’s request. Recover the original three attachments and perform the camera, frame, guidance-line width, and field-line extension edits.