[deep-report] Triage new post-hang-fix failure cluster in mattpocock-skills-reviewer / design-decision-gate / impeccable-skills-reviewer

[github-actions]

Description

The CLI-hang fix (PR #44254, merged 2026-07-08) eliminated the 100% action_required failure mode in mattpocock-skills-reviewer, design-decision-gate, and impeccable-skills-reviewer, confirmed via 0% AR across the last 15 runs each (Agent Performance Report, discussion #58493, 2026-09-04). However, a new, distinct failure mode has since emerged in the same three agents: ~47-53% plain failure conclusions (not action_required). This is a different bug from the one #44254 fixed and needs its own root-cause investigation — do not treat this as the old hang recurring.

Expected Impact

If a shared root cause is found across the three agents, could recover them from ~50% to >90% success (per the source report's estimate).

Suggested Agent

New Agent — pull failure logs for the ~47-53% failing runs across these three workflows and identify the common failure signature before deciding on a fix.

Estimated Effort

Medium (1-2 hours investigation)

Data Source

DeepReport Intelligence Briefing analysis, 2026-09-04 cycle — derived from Agent Performance Report discussion #58493.

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• api.anthropic.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "api.anthropic.com"

See Network Configuration for more information.

Generated by 🔬 Deep Report · claude · agent · 219.9 AIC · ⌖ 11.1 AIC · ⊞ 12.4K · ◷

• expires on Sep 6, 2026, 10:38 AM UTC-08:00

[github-actions]

New evidence: synchronized zero-artifact failure across the whole cluster (+ AI Moderator)

This cycle's Observability Coverage Report (discussion #58637) surfaced a batch of 7 runs — spanning all three tracked workflows plus PR Code Quality Reviewer, Test Quality Sentinel, Ponytail Reviewer, and AI Moderator — that failed with zero runtime artifacts (no access.log, no gateway.jsonl/rpc-messages.jsonl at all, vs. the healthy runs ~15-20 min later for the same workflows which have full firewall/MCP logs).

Live-verified via gh api repos/github/gh-aw/actions/runs/<id> that all 7 completed with conclusion: failure at the same second:

Workflow	Run ID	Completed
Impeccable Skills Reviewer	33927409720	2026-09-04T22:54:08Z
PR Code Quality Reviewer	33927409806	2026-09-04T22:54:08Z
Test Quality Sentinel	33927409809	2026-09-04T22:54:08Z
Ponytail Reviewer	33927409826	2026-09-04T22:54:08Z
Design Decision Gate 🏗️	33927409837	2026-09-04T22:54:08Z
Matt Pocock Skills Reviewer	33927409908	2026-09-04T22:54:08Z
AI Moderator	33927325443	2026-09-04T22:52:53Z

A near-identical later run of the same workflows (33927521xxx series, ~15-20 min after) completed with full firewall/MCP telemetry present. gh api .../jobs returns an empty jobs array for the zero-artifact runs (job data no longer retrievable from this sandbox), so the exact failure point couldn't be pulled live this cycle — but the perfectly-aligned timestamp across 7 otherwise-unrelated workflows strongly suggests a shared infra-level event (e.g. a bad runner image, a shared setup/sandbox-prep step, or an Actions-side outage) rather than 7 coincidental independent per-workflow bugs. Worth checking Actions status history for 2026-09-04 ~22:52-22:54Z UTC, and whether other (non-review-bot) workflows also failed in that exact window.

Source: DeepReport Intelligence Briefing, 2026-09-05 cycle — discussion #58637 (Observability Coverage Report).

Warning

Firewall blocked 2 domains

The following domains were blocked by the firewall during workflow execution:

• api.anthropic.com
• api.github.com

[!TIP]
api.github.com is blocked because GitHub API access uses the built-in GitHub tools by default. Instead of adding api.github.com to network.allowed, use tools.github.mode: gh-proxy for direct pre-authenticated GitHub CLI access without requiring network access to api.github.com:

tools:
  github:
    mode: gh-proxy

See GitHub Tools for more information on gh-proxy mode.

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "api.anthropic.com"
    - "api.github.com"

See Network Configuration for more information.

Generated by 🔬 Deep Report · claude · agent · 196.5 AIC · ⌖ 10.7 AIC · ⊞ 12.4K · ◷

[github-actions]

🍪 Issue Monster selected this for Copilot

I've identified this issue as a good candidate for automated resolution and requested assignment to the Copilot coding agent.

If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.

Om nom nom! 🍪

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• ab.chatgpt.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "ab.chatgpt.com"

See Network Configuration for more information.

🍪 Om nom nom by Issue Monster · codex · mai10 · 2.39 AIC · ⌖ 19.2 AIC · ⊞ 20K · ◷

[github-actions]

Update: 2nd occurrence of the synchronized zero-jobs-scheduled failure (2026-09-05T12:34:45Z)

The pattern first noted here on 2026-09-04 recurred today with a new independent data point that further narrows the likely cause.

New occurrence: 6 review-gate workflows failed at the exact same instant, 2026-09-05T12:34:45Z:

• Impeccable Skills Reviewer
• PR Code Quality Reviewer
• Test Quality Sentinel
• Matt Pocock Skills Reviewer
• Ponytail Reviewer
• Design Decision Gate 🏗️

Run IDs: 33966436644–33966436754. Live-verified via list_workflow_jobs for each run — total_count: 0 (zero jobs scheduled, not zero jobs completed), matching the first occurrence's signature exactly.

Different context than 2026-09-04: this time all 6 workflows fired on a single PR/branch/commit (copilot/fix-github-actions-job-again, SHA 3a5ddfa1...), vs. 7 workflows across different branches on 2026-09-04. Two occurrences on two different branch/commit shapes is stronger evidence for a platform-level dispatch issue than a per-branch or per-commit code path.

Ruled out: bad-commit-content breaking a shared include. The triggering commit's only changed file, linear_create_issue.cjs, does not appear in any of the 6 workflows' compiled .lock.yml files (checked via direct grep of each), so this isn't a case of one commit breaking a shared script that all 6 happen to consume.

Working hypothesis unchanged, now with 2 independent occurrences: this looks like a GitHub Actions platform-level job-dispatch failure (workflow run created, zero jobs ever scheduled) affecting a same-second cluster of otherwise-unrelated review-gate workflows, not a bug in any individual workflow's own code or trigger config.

Suggest reopening/escalating given this is now a 2nd occurrence of the identical signature on a materially different branch/commit — consistent with the "reopen at 2nd occurrence for zero-artifact/zero-job patterns" threshold noted in prior DeepReport cycles.

Data source: DeepReport Intelligence analysis, 2026-09-05 cycle (window since briefing #58753), live-verified via GitHub MCP actions_get/actions_list/get_commit.

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• api.anthropic.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "api.anthropic.com"

See Network Configuration for more information.

Generated by 🔬 Deep Report · claude · agent · 339.6 AIC · ⌖ 7.91 AIC · ⊞ 12.8K · ◷

[github-actions]

This issue was automatically closed because it expired on 2026-09-06T18:38:00.467Z.

Closed by Workflow