[plan] Investigate and Fix Security Guard Agent Transient Failures

[github-actions]

Objective

Investigate the pattern of 4 Security Guard Agent failures within a 2-hour window on 2026-02-07 and implement fixes to prevent recurrence.

Context

From Discussion #14345, the Security Guard Agent failed 4 times between 13:13-13:25 UTC:

• §21780787684 on PR copilot/standardize-error-wrapping
• §21780706370 on PR copilot/normalize-report-formatting-again
• §21780681085 on PR copilot/refactor-expired-entity-cleanup
• §21780647470 on PR copilot/fix-cmd-tests-nondeterminism

The concentrated time window suggests a transient issue rather than systematic problems.

Approach

1. Download and analyze logs from all 4 failed runs using gh aw logs
2. Identify common error patterns across the failures
3. Determine if this was a service/API outage or workflow logic issue
4. Review Security Guard Agent workflow configuration for resilience
5. Implement retry logic or better error handling if needed
6. Add defensive checks for transient failures

Files to Review

• .github/workflows/security-guard-agent.md - Workflow definition
• .github/workflows/security-guard-agent.lock.yml - Compiled workflow
• Workflow run logs from the 4 failed runs

Acceptance Criteria

• Root cause of failures identified and documented
• If transient service issue, add retry logic with exponential backoff
• If workflow logic issue, implement fixes
• Add error handling to gracefully handle similar failures
• Test fixes don't introduce regressions
• Document findings in issue comments

AI generated by Plan Command for discussion #14345

• expires on Feb 9, 2026, 2:05 PM UTC