`, timeout, or auth message anywhere in the captured tail.\n\n### Probable root cause\n\nA silent/deferred failure — likely a non-zero exit code or a downstream safe-outputs validation check that fires *after* the visible Copilot CLI stream ends, since housekeeping still completes normally. Because this hit 3 independent workflows same-day, treat as infra-level (shared Copilot CLI wrapper/harness), not workflow-specific logic.\n\n### Proposed remediation\n\n1. Instrument the Copilot CLI wrapper to emit an explicit exit-code/error line on termination — a non-zero exit with a clean-looking log is currently indistinguishable from success.\n2. Audit the safe-outputs post-processing step that runs after the visible Copilot CLI stream ends for a swallowed exception or silent validation failure.\n3. Prioritize the shared invocation code path over per-workflow logic, given 3 unrelated workflows failed identically the same day.\n\n### Success criteria\n\n`Execute GitHub Copilot CLI` failures surface a specific, non-empty error/exit-code in logs; the three affected workflows either pass or fail with a diagnosable cause, and their traffic-volume profile matches known-good runs.\n\n**Parent:** #53129\n","labels":["bug","automation","agentic-workflows"],"parent":53129,"title":"[aw-failures] [P1] Execute GitHub Copilot CLI silently exits early — 3 unrelated workflows same day"}}}

`/exit code line anywhere in the 50-line tail.\n\nRun 32089118620 (same workflow, ~3.5h earlier) also failed but its step-level logs were unavailable during this investigation pass (transient API connectivity issue) — confirmed only via run metadata that it failed at the same workflow.\n</details>\n\n### Probable root cause\n\nTimeout/hang signature, not a clean failure: the CLI process appears to be killed while blocked on a large-diff `Read`, and nothing in the workflow surfaces that as a distinguishable error — the log just goes silent.\n\n### Proposed remediation\n\n1. Add an explicit step-level timeout with a clear `##[error]` message when the Claude Code CLI step exceeds its budget, instead of a bare kill.\n2. Cap or paginate the diff size handed to the agent — large `Read` calls on `pr.diff` are the apparent hang point in both failures.\n3. Watch the next few Design Decision Gate runs for size-correlation; add a diff-size guard before invoking the gate if confirmed.\n\n### Success criteria\n\nDesign Decision Gate runs complete (pass or fail) without silent mid-tool-use termination; timeouts show an explicit error in logs; similarly-sized PR diffs no longer trigger the hang.\n\n**Parent:** #53129\n","labels":["bug","automation","agentic-workflows"],"parent":53129,"title":"[aw-failures] [P1] Design Decision Gate hangs silently mid-tool-use in Claude Code CLI step"}}}

`, timeout, or auth message anywhere in the captured tail.\n\n### Probable root cause\n\nA silent/deferred failure — likely a non-zero exit code or a downstream safe-outputs validation check that fires *after* the visible Copilot CLI stream ends, since housekeeping still completes normally. Because this hit 3 independent workflows same-day, treat as infra-level (shared Copilot CLI wrapper/harness), not workflow-specific logic.\n\n### Proposed remediation\n\n1. Instrument the Copilot CLI wrapper to emit an explicit exit-code/error line on termination — a non-zero exit with a clean-looking log is currently indistinguishable from success.\n2. Audit the safe-outputs post-processing step that runs after the visible Copilot CLI stream ends for a swallowed exception or silent validation failure.\n3. Prioritize the shared invocation code path over per-workflow logic, given 3 unrelated workflows failed identically the same day.\n\n### Success criteria\n\n`Execute GitHub Copilot CLI` failures surface a specific, non-empty error/exit-code in logs; the three affected workflows either pass or fail with a diagnosable cause, and their traffic-volume profile matches known-good runs.\n\n**Parent:** #53129\n","labels":["bug","automation","agentic-workflows"],"parent":53129,"title":"[aw-failures] [P1] Execute GitHub Copilot CLI silently exits early — 3 unrelated workflows same day"},"name":"create_issue"}}}

`/exit code line anywhere in the 50-line tail.\n\nRun 32089118620 (same workflow, ~3.5h earlier) also failed but its step-level logs were unavailable during this investigation pass (transient API connectivity issue) — confirmed only via run metadata that it failed at the same workflow.\n\u003c/details\u003e\n\n### Probable root cause\n\nTimeout/hang signature, not a clean failure: the CLI process appears to be killed while blocked on a large-diff `Read`, and nothing in the workflow surfaces that as a distinguishable error — the log just goes silent.\n\n### Proposed remediation\n\n1. Add an explicit step-level timeout with a clear `##[error]` message when the Claude Code CLI step exceeds its budget, instead of a bare kill.\n2. Cap or paginate the diff size handed to the agent — large `Read` calls on `pr.diff` are the apparent hang point in both failures.\n3. Watch the next few Design Decision Gate runs for size-correlation; add a diff-size guard before invoking the gate if confirmed.\n\n### Success criteria\n\nDesign Decision Gate runs complete (pass or fail) without silent mid-tool-use termination; timeouts show an explicit error in logs; similarly-sized PR diffs no longer trigger the hang.\n\n**Parent:** #53129\n","labels":["bug","automation","agentic-workflows"],"parent":53129,"title":"[aw-failures] [P1] Design Decision Gate hangs silently mid-tool-use in Claude Code CLI step"},"name":"create_issue"}}}

line — e.g. \"log ends abruptly during X\" or \"last message shows Y\")\n- tool_failure_pattern: what tool/step + what kind of failure (timeout, crash, hang, auth, schema mismatch, etc.)\n- anomalies: anything unusual (e.g. no visible root cause, log truncation point, repeated env dumps, etc.)\n- failure_class: one of infra|tool|data|policy|unknown\n\nReturn ONLY this JSON (no prose):\n{\"cluster_evidence\":[{\"cluster_id\":\"cluster-2\",\"dominant_error\":\"...\",\"tool_failure_pattern\":\"...\",\"anomalies\":[\"...\"],\"failure_class\":\"...\",\"evidence_run_ids\":[123]},{\"cluster_id\":\"cluster-3\",\"dominant_error\":\"...\",\"tool_failure_pattern\":\"...\",\"anomalies\":[\"...\"],\"failure_class\":\"...\",\"evidence_run_ids\":[123,456]}]}","uuid":"32e5925e-4b45-4b05-a09e-35ab287cd0c2","session_id":"2b24d7a9-0bee-49c0-b7b1-ffdd9a50d6cb"}

line — e.g. \"log ends abruptly during X\" or \"last message shows Y\")\n- tool_failure_pattern: what tool/step + what kind of failure (timeout, crash, hang, auth, schema mismatch, etc.)\n- anomalies: anything unusual (e.g. no visible root cause, log truncation point, repeated env dumps, etc.)\n- failure_class: one of infra|tool|data|policy|unknown\n\nReturn ONLY this JSON (no prose):\n{\"cluster_evidence\":[{\"cluster_id\":\"cluster-2\",\"dominant_error\":\"...\",\"tool_failure_pattern\":\"...\",\"anomalies\":[\"...\"],\"failure_class\":\"...\",\"evidence_run_ids\":[123]},{\"cluster_id\":\"cluster-3\",\"dominant_error\":\"...\",\"tool_failure_pattern\":\"...\",\"anomalies\":[\"...\"],\"failure_class\":\"...\",\"evidence_run_ids\":[123,456]}]}","run_in_background":false},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":823,"cache_read_input_tokens":81873,"cache_creation":{"ephemeral_5m_input_tokens":823,"ephemeral_1h_input_tokens":0},"output_tokens":3,"service_tier":"standard","inference_geo":"global"},"context_management":null},"parent_tool_use_id":null,"session_id":"2b24d7a9-0bee-49c0-b7b1-ffdd9a50d6cb","uuid":"56d49d8c-f220-45c3-8d25-0a21286d294c","timestamp":"2026-08-18T07:15:08.925Z","request_id":"req_011Ce9oTYKBaEeMC41EiAVHV"}

and end in MCP tool-schema dump or log-housekeeping output — a materially different signature, not just superficial 'CLI fails' overlap.\"}]}"},{"type":"text","text":"agentId: a73e776b9d6ef7f97 (use SendMessage with to: 'a73e776b9d6ef7f97', summary: '<5-10 word recap>' to continue this agent)\n<usage>subagent_tokens: 39821\ntool_uses: 3\nduration_ms: 22092</usage>"}]}]},"parent_tool_use_id":null,"session_id":"2b24d7a9-0bee-49c0-b7b1-ffdd9a50d6cb","uuid":"2fbe0008-d428-4833-bc05-e481ac6494e6","timestamp":"2026-08-18T07:14:49.560Z","tool_use_result":{"status":"completed","prompt":"You are acting as an \"issue-matcher\" agent for an agentic-workflow failure investigation in github/gh-aw.\n\nHere are 3 failure clusters found in the last 6 hours:\n\n1. cluster-1 (P2): workflow \"Daily Container Image Security Scan\" (.github/workflows/daily-squid-image-scan.lock.yml), run 32103590831. Signature: step 'Enforce critical vulnerability and license gates' fails with \"Critical vulnerabilities detected in container images.\" — this looks like the policy gate correctly blocking on a real vulnerability finding, not a workflow bug.\n\n2. cluster-2 (P1): workflow \"Design Decision Gate\" (.github/workflows/design-decision-gate.lock.yml), runs 32101513747 and 32089118620 (same day, ~3.5h apart). Signature: agent job fails during 'Execute Claude Code CLI' step with no explicit error captured in the tail (conversation cut off mid-tool-use).\n\n3. cluster-3 (P1): workflows \"Daily Sub-Agent Model Resolution Audit\", \"Daily GitHub Docs SEO Optimizer\", \"Metrics Collector\" (runs 32103509594, 32100895296, 32092825920). Signature: 'Execute GitHub Copilot CLI' step fails with no explicit ##[error] message in captured tail; logs end mid MCP tool-schema dump or in routine log-housekeeping output — actual failure cause not visible in the truncated tail.\n\nHere are the currently open issues labeled/related to agentic-workflow failures (some titles truncated):\n[\n {\"number\": 53263, \"title\": \"[aw-failures] safe_outputs job hard-fails entire batch on one non-retryable error\", \"updatedAt\": \"2026-08-17T19:12:32Z\"},\n {\"number\": 52726, \"title\": \"[aw-failures] [P0] Sentry/Grafana MCP servers silently omitted when secrets missing — blocks Daily AIC Consumption Report\", \"updatedAt\": \"2026-08-15T05:49:46Z\"},\n {\"number\": 53262, \"title\": \"[aw-failures] Smoke Copilot Sub Agents: 'evals' artifact not found — full run failure\", \"updatedAt\": \"2026-08-17T01:43:21Z\"},\n {\"number\": 52502, \"title\": \"[aw-failures] [P1] PR Sous Chef: Start DIFC Proxy step fails with no captured root cause\", \"updatedAt\": \"2026-08-14T04:46:21Z\"},\n {\"number\": 52459, \"title\": \"[aw-failures] [P1] Anthropic proxy connection-refused/retry-exhaustion now hitting 3 workflows after ~10 retries\", \"updatedAt\": \"2026-08-15T07:15:49Z\"},\n {\"number\": 52253, \"title\": \"[aw-failures] [P1] Copilot engine proxy (port 10002) refuses connections despite passing key validation — Daily Assign Issue To ... [truncated]\", \"updatedAt\": \"2026-08-14T03:54:45Z\"},\n {\"number\": 51984, \"title\": \"[aw-failures] [P0] Bun runtime segfault crashing Claude Code CLI — now hitting 2 workflows\", \"updatedAt\": \"2026-08-17T01:32:38Z\"},\n {\"number\": 53130, \"title\": \"[aw-failures] [P0] Daily Evals Feature Report: Execute Codex CLI hangs with total egress blackout (18m36s, zero calls to any domain)\", \"updatedAt\": \"2026-08-16T13:22:20Z\"},\n {\"number\": 53191, \"title\": \"[aw-failures] [P1] Two new job-failure root causes: AWF binary curl reset in Daily SPDD evals + MCP Gateway serena digest-pin sc... [truncated]\", \"updatedAt\": \"2026-08-16T20:47:46Z\"},\n {\"number\": 53559, \"title\": \"[regression] Daily CI Regression Audit — 32092218847\", \"updatedAt\": \"2026-08-18T02:40:43Z\"},\n {\"number\": 53129, \"title\": \"[aw-failures] [aw] Failure Investigator Report — 2026-08-16 13:00 UTC (6h)\", \"updatedAt\": \"2026-08-17T19:12:33Z\"},\n {\"number\": 48838, \"title\": \"[aw] No-Op Runs\", \"updatedAt\": \"2026-08-1

and end in MCP tool-schema dump or log-housekeeping output — a materially different signature, not just superficial 'CLI fails' overlap.\"}]}","usage":{"total_tokens":38276,"tool_uses":3,"duration_ms":22091},"uuid":"5b77758c-02ba-4049-ad2d-56de95920887","session_id":"2b24d7a9-0bee-49c0-b7b1-ffdd9a50d6cb"}

message in captured tail; logs end mid MCP tool-schema dump or in routine log-housekeeping output — actual failure cause not visible in the truncated tail.\n\nHere are the currently open issues labeled/related to agentic-workflow failures (some titles truncated):\n[\n {\"number\": 53263, \"title\": \"[aw-failures] safe_outputs job hard-fails entire batch on one non-retryable error\", \"updatedAt\": \"2026-08-17T19:12:32Z\"},\n {\"number\": 52726, \"title\": \"[aw-failures] [P0] Sentry/Grafana MCP servers silently omitted when secrets missing — blocks Daily AIC Consumption Report\", \"updatedAt\": \"2026-08-15T05:49:46Z\"},\n {\"number\": 53262, \"title\": \"[aw-failures] Smoke Copilot Sub Agents: 'evals' artifact not found — full run failure\", \"updatedAt\": \"2026-08-17T01:43:21Z\"},\n {\"number\": 52502, \"title\": \"[aw-failures] [P1] PR Sous Chef: Start DIFC Proxy step fails with no captured root cause\", \"updatedAt\": \"2026-08-14T04:46:21Z\"},\n {\"number\": 52459, \"title\": \"[aw-failures] [P1] Anthropic proxy connection-refused/retry-exhaustion now hitting 3 workflows after ~10 retries\", \"updatedAt\": \"2026-08-15T07:15:49Z\"},\n {\"number\": 52253, \"title\": \"[aw-failures] [P1] Copilot engine proxy (port 10002) refuses connections despite passing key validation — Daily Assign Issue To ... [truncated]\", \"updatedAt\": \"2026-08-14T03:54:45Z\"},\n {\"number\": 51984, \"title\": \"[aw-failures] [P0] Bun runtime segfault crashing Claude Code CLI — now hitting 2 workflows\", \"updatedAt\": \"2026-08-17T01:32:38Z\"},\n {\"number\": 53130, \"title\": \"[aw-failures] [P0] Daily Evals Feature Report: Execute Codex CLI hangs with total egress blackout (18m36s, zero calls to any domain)\", \"updatedAt\": \"2026-08-16T13:22:20Z\"},\n {\"number\": 53191, \"title\": \"[aw-failures] [P1] Two new job-failure root causes: AWF binary curl reset in Daily SPDD evals + MCP Gateway serena digest-pin sc... [truncated]\", \"updatedAt\": \"2026-08-16T20:47:46Z\"},\n {\"number\": 53559, \"title\": \"[regression] Daily CI Regression Audit — 32092218847\", \"updatedAt\": \"2026-08-18T02:40:43Z\"},\n {\"number\": 53129, \"title\": \"[aw-failures] [aw] Failure Investigator Report — 2026-08-16 13:00 UTC (6h)\", \"updatedAt\": \"2026-08-17T19:12:33Z\"},\n {\"number\": 48838, \"title\": \"[aw] No-Op Runs\", \"updatedAt\": \"2026-08-18T06:26:39Z\"}\n]\n\nFor clusters 2 and 3, the candidate matches are unclear from titles alone (candidates: #51984 \"Bun runtime segfault crashing Claude Code CLI\" for cluster-2 since it involves the same 'Execute Claude Code CLI' step; #52253 \"Copilot engine proxy refuses connections\" or #52459 \"Anthropic proxy connection-refused\" for cluster-3 since it involves CLI step failures with proxy-adjacent symptoms). Use `gh issue view <number> --repo github/gh-aw --json body,comments` (read-only) to check the body of #51984, #52253, and #52459 to see if their described root cause/symptoms match clusters 2 and 3's signatures (same workflow name, same error pattern, still open/unresolved). Do NOT modify anything, only read.\n\nMatch by error_signature similarity and workflow name overlap — a match requires the SAME workflow(s) or clearly the same underlying root cause described in the issue body, not just superficial keyword overlap (e.g. \"CLI fails\" alone is not enough).\n\nReturn ONLY this JSON (no prose):\n{\"matched\":[{\"cluster_id\":\"cluster-1\",\"issue_number\":42,\"confidence\":\"high|medium|low\"}],\"gaps\":[{\"cluster_id\":\"cluster-2\",\"reason\":\"no existing issue covers this signature\"}]}"}]},"parent_tool_use_id":"toolu_01HHZucCe9S56NPNhg8fLJgt","session_id":"2b24d7a9-0bee-49c0-b7b1-ffdd9a50d6cb","uuid":"523646b4-adc6-4d9e-a364-b8ff0eb6b9fc","timestamp":"2026-08-18T07:14:27.468Z","subagent_type":"general-purpose","task_description":"Match failure clusters to existing issues"}

message in captured tail; logs end mid MCP tool-schema dump or in routine log-housekeeping output — actual failure cause not visible in the truncated tail.\n\nHere are the currently open issues labeled/related to agentic-workflow failures (some titles truncated):\n[\n {\"number\": 53263, \"title\": \"[aw-failures] safe_outputs job hard-fails entire batch on one non-retryable error\", \"updatedAt\": \"2026-08-17T19:12:32Z\"},\n {\"number\": 52726, \"title\": \"[aw-failures] [P0] Sentry/Grafana MCP servers silently omitted when secrets missing — blocks Daily AIC Consumption Report\", \"updatedAt\": \"2026-08-15T05:49:46Z\"},\n {\"number\": 53262, \"title\": \"[aw-failures] Smoke Copilot Sub Agents: 'evals' artifact not found — full run failure\", \"updatedAt\": \"2026-08-17T01:43:21Z\"},\n {\"number\": 52502, \"title\": \"[aw-failures] [P1] PR Sous Chef: Start DIFC Proxy step fails with no captured root cause\", \"updatedAt\": \"2026-08-14T04:46:21Z\"},\n {\"number\": 52459, \"title\": \"[aw-failures] [P1] Anthropic proxy connection-refused/retry-exhaustion now hitting 3 workflows after ~10 retries\", \"updatedAt\": \"2026-08-15T07:15:49Z\"},\n {\"number\": 52253, \"title\": \"[aw-failures] [P1] Copilot engine proxy (port 10002) refuses connections despite passing key validation — Daily Assign Issue To ... [truncated]\", \"updatedAt\": \"2026-08-14T03:54:45Z\"},\n {\"number\": 51984, \"title\": \"[aw-failures] [P0] Bun runtime segfault crashing Claude Code CLI — now hitting 2 workflows\", \"updatedAt\": \"2026-08-17T01:32:38Z\"},\n {\"number\": 53130, \"title\": \"[aw-failures] [P0] Daily Evals Feature Report: Execute Codex CLI hangs with total egress blackout (18m36s, zero calls to any domain)\", \"updatedAt\": \"2026-08-16T13:22:20Z\"},\n {\"number\": 53191, \"title\": \"[aw-failures] [P1] Two new job-failure root causes: AWF binary curl reset in Daily SPDD evals + MCP Gateway serena digest-pin sc... [truncated]\", \"updatedAt\": \"2026-08-16T20:47:46Z\"},\n {\"number\": 53559, \"title\": \"[regression] Daily CI Regression Audit — 32092218847\", \"updatedAt\": \"2026-08-18T02:40:43Z\"},\n {\"number\": 53129, \"title\": \"[aw-failures] [aw] Failure Investigator Report — 2026-08-16 13:00 UTC (6h)\", \"updatedAt\": \"2026-08-17T19:12:33Z\"},\n {\"number\": 48838, \"title\": \"[aw] No-Op Runs\", \"updatedAt\": \"2026-08-18T06:26:39Z\"}\n]\n\nFor clusters 2 and 3, the candidate matches are unclear from titles alone (candidates: #51984 \"Bun runtime segfault crashing Claude Code CLI\" for cluster-2 since it involves the same 'Execute Claude Code CLI' step; #52253 \"Copilot engine proxy refuses connections\" or #52459 \"Anthropic proxy connection-refused\" for cluster-3 since it involves CLI step failures with proxy-adjacent symptoms). Use `gh issue view <number> --repo github/gh-aw --json body,comments` (read-only) to check the body of #51984, #52253, and #52459 to see if their described root cause/symptoms match clusters 2 and 3's signatures (same workflow name, same error pattern, still open/unresolved). Do NOT modify anything, only read.\n\nMatch by error_signature similarity and workflow name overlap — a match requires the SAME workflow(s) or clearly the same underlying root cause described in the issue body, not just superficial keyword overlap (e.g. \"CLI fails\" alone is not enough).\n\nReturn ONLY this JSON (no prose):\n{\"matched\":[{\"cluster_id\":\"cluster-1\",\"issue_number\":42,\"confidence\":\"high|medium|low\"}],\"gaps\":[{\"cluster_id\":\"cluster-2\",\"reason\":\"no existing issue covers this signature\"}]}","uuid":"1a336472-71d7-4922-96fc-2c326796ee03","session_id":"2b24d7a9-0bee-49c0-b7b1-ffdd9a50d6cb"}

message in captured tail; logs end mid MCP tool-schema dump or in routine log-housekeeping output — actual failure cause not visible in the truncated tail.\n\nHere are the currently open issues labeled/related to agentic-workflow failures (some titles truncated):\n[\n {\"number\": 53263, \"title\": \"[aw-failures] safe_outputs job hard-fails entire batch on one non-retryable error\", \"updatedAt\": \"2026-08-17T19:12:32Z\"},\n {\"number\": 52726, \"title\": \"[aw-failures] [P0] Sentry/Grafana MCP servers silently omitted when secrets missing — blocks Daily AIC Consumption Report\", \"updatedAt\": \"2026-08-15T05:49:46Z\"},\n {\"number\": 53262, \"title\": \"[aw-failures] Smoke Copilot Sub Agents: 'evals' artifact not found — full run failure\", \"updatedAt\": \"2026-08-17T01:43:21Z\"},\n {\"number\": 52502, \"title\": \"[aw-failures] [P1] PR Sous Chef: Start DIFC Proxy step fails with no captured root cause\", \"updatedAt\": \"2026-08-14T04:46:21Z\"},\n {\"number\": 52459, \"title\": \"[aw-failures] [P1] Anthropic proxy connection-refused/retry-exhaustion now hitting 3 workflows after ~10 retries\", \"updatedAt\": \"2026-08-15T07:15:49Z\"},\n {\"number\": 52253, \"title\": \"[aw-failures] [P1] Copilot engine proxy (port 10002) refuses connections despite passing key validation — Daily Assign Issue To ... [truncated]\", \"updatedAt\": \"2026-08-14T03:54:45Z\"},\n {\"number\": 51984, \"title\": \"[aw-failures] [P0] Bun runtime segfault crashing Claude Code CLI — now hitting 2 workflows\", \"updatedAt\": \"2026-08-17T01:32:38Z\"},\n {\"number\": 53130, \"title\": \"[aw-failures] [P0] Daily Evals Feature Report: Execute Codex CLI hangs with total egress blackout (18m36s, zero calls to any domain)\", \"updatedAt\": \"2026-08-16T13:22:20Z\"},\n {\"number\": 53191, \"title\": \"[aw-failures] [P1] Two new job-failure root causes: AWF binary curl reset in Daily SPDD evals + MCP Gateway serena digest-pin sc... [truncated]\", \"updatedAt\": \"2026-08-16T20:47:46Z\"},\n {\"number\": 53559, \"title\": \"[regression] Daily CI Regression Audit — 32092218847\", \"updatedAt\": \"2026-08-18T02:40:43Z\"},\n {\"number\": 53129, \"title\": \"[aw-failures] [aw] Failure Investigator Report — 2026-08-16 13:00 UTC (6h)\", \"updatedAt\": \"2026-08-17T19:12:33Z\"},\n {\"number\": 48838, \"title\": \"[aw] No-Op Runs\", \"updatedAt\": \"2026-08-18T06:26:39Z\"}\n]\n\nFor clusters 2 and 3, the candidate matches are unclear from titles alone (candidates: #51984 \"Bun runtime segfault crashing Claude Code CLI\" for cluster-2 since it involves the same 'Execute Claude Code CLI' step; #52253 \"Copilot engine proxy refuses connections\" or #52459 \"Anthropic proxy connection-refused\" for cluster-3 since it involves CLI step failures with proxy-adjacent symptoms). Use `gh issue view <number> --repo github/gh-aw --json body,comments` (read-only) to check the body of #51984, #52253, and #52459 to see if their described root cause/symptoms match clusters 2 and 3's signatures (same workflow name, same error pattern, still open/unresolved). Do NOT modify anything, only read.\n\nMatch by error_signature similarity and workflow name overlap — a match requires the SAME workflow(s) or clearly the same underlying root cause described in the issue body, not just superficial keyword overlap (e.g. \"CLI fails\" alone is not enough).\n\nReturn ONLY this JSON (no prose):\n{\"matched\":[{\"cluster_id\":\"cluster-1\",\"issue_number\":42,\"confidence\":\"high|medium|low\"}],\"gaps\":[{\"cluster_id\":\"cluster-2\",\"reason\":\"no existing issue covers this signature\"}]}","run_in_background":false},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":568,"cache_read_input_tokens":78495,"cache_creation":{"ephemeral_5m_input_tokens":568,"ephemeral_1h_input_tokens":0},"output_tokens":3,"service_tier":"standard","inference_geo":"global"},"context_management":null},"parent_tool_use_id":null,"session_id":"2b24d7a9-0bee-49c0-b7b1-ffdd9a50d6cb","uuid":"b2e71912-09

message in captured tail; logs end mid MCP tool-schema dump or in routine log-housekeeping output, so the actual failure cause is not","is_error":false}]},"parent_tool_use_id":null,"session_id":"2b24d7a9-0bee-49c0-b7b1-ffdd9a50d6cb","uuid":"3d7f36d7-7a47-4576-b0f5-bd11705c51e5","timestamp":"2026-08-18T07:13:50.183Z","tool_use_result":{"stdout":"cluster-1 P2 32103590831 32103509594 ['Daily Container Image Security Scan'] [32103590831]\n sig: Critical vulnerability gate failure: step 'Enforce critical vulnerability and license gates' errors 'Critical vulnerabilities detected in container images.' and exits 1 (policy gate correctly blocking\n\ncluster-2 P1 32101513747 32100895296 ['Design Decision Gate'] [32101513747, 32089118620]\n sig: Design Decision Gate agent job fails during 'Execute Claude Code CLI' step with no explicit error captured in tail (conversation cut off mid-tool-use); same workflow failed twice same day (run 3210151\n\ncluster-3 P1 32103509594 32103590831 ['Daily Sub-Agent Model Resolution Audit', 'Daily GitHub Docs SEO Optimizer', 'Metrics Collector'] [32103509594, 32100895296, 32092825920]\n sig: 'Execute GitHub Copilot CLI' step fails with no explicit ##[error] message in captured tail; logs end mid MCP tool-schema dump or in routine log-housekeeping output, so the actual failure cause is not","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false}}

message in captured tail; logs end mid MCP tool-schema dump or in routine log-housekeeping output, so the actual failure cause is not visible in the truncated tail (recurs across 3 distinct scheduled workflows)\\\",\n 'run_ids': [32103509594, 32100895296, 32092825920],\n 'truncated_error_logs': by_id[32103509594]['truncated_error_logs']\n})\n\nresult = {'clusters': clusters}\nwith open('final_output.json','w') as f:\n json.dump(result, f)\nprint('OK', len(json.dumps(result)))\n\"\n"},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":213,"cache_read_input_tokens":69319,"cache_creation":{"ephemeral_5m_input_tokens":213,"ephemeral_1h_input_tokens":0},"output_tokens":2,"service_tier":"standard","inference_geo":"global"},"context_management":null},"parent_tool_use_id":"toolu_01Wj599EkBsu2i5vYNWWYUum","session_id":"2b24d7a9-0bee-49c0-b7b1-ffdd9a50d6cb","uuid":"0970f803-4ce7-4b40-8a80-50620e3417dd","timestamp":"2026-08-18T07:09:30.393Z","request_id":"req_011Ce9o2hXd4KbWvX1tuKNUy","subagent_type":"general-purpose","task_description":"Classify failures into severity clusters"}

Critical vulnerabilities detected in container images.\n1:##[error]Process completed with exit code 1."}]},"parent_tool_use_id":"toolu_01Wj599EkBsu2i5vYNWWYUum","session_id":"2b24d7a9-0bee-49c0-b7b1-ffdd9a50d6cb","uuid":"a2aabda3-06d6-48a4-99cd-88de3cba28ea","timestamp":"2026-08-18T07:07:53.752Z","subagent_type":"general-purpose","task_description":"Classify failures into severity clusters"}

`, timeout, or auth message anywhere in the captured tail.\n\n### Probable root cause\n\nA silent/deferred failure — likely a non-zero exit code or a downstream safe-outputs validation check that fires *after* the visible Copilot CLI stream ends, since housekeeping still completes normally. Because this hit 3 independent workflows same-day, treat as infra-level (shared Copilot CLI wrapper/harness), not workflow-specific logic.\n\n### Proposed remediation\n\n1. Instrument the Copilot CLI wrapper to emit an explicit exit-code/error line on termination — a non-zero exit with a clean-looking log is currently indistinguishable from success.\n2. Audit the safe-outputs post-processing step that runs after the visible Copilot CLI stream ends for a swallowed exception or silent validation failure.\n3. Prioritize the shared invocation code path over per-workflow logic, given 3 unrelated workflows failed identically the same day.\n\n### Success criteria\n\n`Execute GitHub Copilot CLI` failures surface a specific, non-empty error/exit-code in logs; the three affected workflows either pass or fail with a diagnosable cause, and their traffic-volume profile matches known-good runs.\n\n**Parent:** #53129\n","labels":["bug","automation","agentic-workflows"],"parent":53129,"title":"[aw-failures] [P1] Execute GitHub Copilot CLI silently exits early — 3 unrelated workflows same day"}}}

`/exit code line anywhere in the 50-line tail.\n\nRun 32089118620 (same workflow, ~3.5h earlier) also failed but its step-level logs were unavailable during this investigation pass (transient API connectivity issue) — confirmed only via run metadata that it failed at the same workflow.\n</details>\n\n### Probable root cause\n\nTimeout/hang signature, not a clean failure: the CLI process appears to be killed while blocked on a large-diff `Read`, and nothing in the workflow surfaces that as a distinguishable error — the log just goes silent.\n\n### Proposed remediation\n\n1. Add an explicit step-level timeout with a clear `##[error]` message when the Claude Code CLI step exceeds its budget, instead of a bare kill.\n2. Cap or paginate the diff size handed to the agent — large `Read` calls on `pr.diff` are the apparent hang point in both failures.\n3. Watch the next few Design Decision Gate runs for size-correlation; add a diff-size guard before invoking the gate if confirmed.\n\n### Success criteria\n\nDesign Decision Gate runs complete (pass or fail) without silent mid-tool-use termination; timeouts show an explicit error in logs; similarly-sized PR diffs no longer trigger the hang.\n\n**Parent:** #53129\n","labels":["bug","automation","agentic-workflows"],"parent":53129,"title":"[aw-failures] [P1] Design Decision Gate hangs silently mid-tool-use in Claude Code CLI step"}}}

`, timeout, or auth message anywhere in the captured tail.\n\n### Probable root cause\n\nA silent/deferred failure — likely a non-zero exit code or a downstream safe-outputs validation check that fires *after* the visible Copilot CLI stream ends, since housekeeping still completes normally. Because this hit 3 independent workflows same-day, treat as infra-level (shared Copilot CLI wrapper/harness), not workflow-specific logic.\n\n### Proposed remediation\n\n1. Instrument the Copilot CLI wrapper to emit an explicit exit-code/error line on termination — a non-zero exit with a clean-looking log is currently indistinguishable from success.\n2. Audit the safe-outputs post-processing step that runs after the visible Copilot CLI stream ends for a swallowed exception or silent validation failure.\n3. Prioritize the shared invocation code path over per-workflow logic, given 3 unrelated workflows failed identically the same day.\n\n### Success criteria\n\n`Execute GitHub Copilot CLI` failures surface a specific, non-empty error/exit-code in logs; the three affected workflows either pass or fail with a diagnosable cause, and their traffic-volume profile matches known-good runs.\n\n**Parent:** #53129\n","labels":["bug","automation","agentic-workflows"],"parent":53129,"title":"[aw-failures] [P1] Execute GitHub Copilot CLI silently exits early — 3 unrelated workflows same day"},"name":"create_issue"}}}

`/exit code line anywhere in the 50-line tail.\n\nRun 32089118620 (same workflow, ~3.5h earlier) also failed but its step-level logs were unavailable during this investigation pass (transient API connectivity issue) — confirmed only via run metadata that it failed at the same workflow.\n\u003c/details\u003e\n\n### Probable root cause\n\nTimeout/hang signature, not a clean failure: the CLI process appears to be killed while blocked on a large-diff `Read`, and nothing in the workflow surfaces that as a distinguishable error — the log just goes silent.\n\n### Proposed remediation\n\n1. Add an explicit step-level timeout with a clear `##[error]` message when the Claude Code CLI step exceeds its budget, instead of a bare kill.\n2. Cap or paginate the diff size handed to the agent — large `Read` calls on `pr.diff` are the apparent hang point in both failures.\n3. Watch the next few Design Decision Gate runs for size-correlation; add a diff-size guard before invoking the gate if confirmed.\n\n### Success criteria\n\nDesign Decision Gate runs complete (pass or fail) without silent mid-tool-use termination; timeouts show an explicit error in logs; similarly-sized PR diffs no longer trigger the hang.\n\n**Parent:** #53129\n","labels":["bug","automation","agentic-workflows"],"parent":53129,"title":"[aw-failures] [P1] Design Decision Gate hangs silently mid-tool-use in Claude Code CLI step"},"name":"create_issue"}}}

- Line 1: update_issue requires at least one of: 'status', 'title', 'body', 'labels', 'assignees', 'milestone' fields

Validation errors found:

Failed to scan directory /tmp/gh-aw/aw-mcp/logs/run-32103509594/usage: EACCES: permission denied, scandir '/tmp/gh-aw/aw-mcp/logs/run-32103509594/usage'