Treat add_comment 404s as warnings in safe output handler

[Copilot]

Safe output jobs fail when discussions/issues are deleted between agent execution and comment processing. These 404s create false failures in monitoring without indicating actual problems.

Changes

• Modified /actions/setup/js/add_comment.cjs to detect 404 errors via status code or message content (case-insensitive)
• 404s now log warnings and return {success: true, skipped: true} to continue processing other operations
• Non-404 errors unchanged - permissions (403), validation (422), and other failures still error correctly

Detection logic

const is404 = error?.status === 404 || 
              errorMessage.includes("404") || 
              errorMessage.toLowerCase().includes("not found");

if (is404) {
  core.warning(`Target was not found (may have been deleted): ${errorMessage}`);
  return { success: true, warning: `Target not found: ${errorMessage}`, skipped: true };
}

Impact

Reduces false failure rates from deleted targets while preserving error signal for genuine issues.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[deep-report] Treat add_comment 404s as warnings in safe output handler</issue_title>
<issue_description>### Description
Safe output health reported 404 "Not Found" errors when discussions were deleted between agent execution and safe output processing. Update the add_comment handler to downgrade 404s to warnings (continue processing other operations) while preserving errors for other status codes.

Expected Impact

Reduces false failure rates in safe output jobs and improves signal-to-noise in monitoring without masking real errors.

Suggested Agent

Safe Output Health Monitor

Estimated Effort

Medium (1-4 hours)

Data Source

DeepReport Intelligence Briefing - 2026-01-23 (see discussion #11409)

AI generated by DeepReport - Intelligence Gathering Agent

Comments on the Issue (you are @copilot in this section)

• Fixes [deep-report] Treat add_comment 404s as warnings in safe output handler #11524

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