[deep-report] Fix codex-engine MCP binary lookup at the shared-path level (65% fail rate, chronic since 2026-06-15) #55201

Description

The Daily Agentic Workflow Audit (discussion #55173, window 2026-08-22T21:17Z-2026-08-23T15:25Z) reports the codex engine at a 65% fail rate (11/17 runs) fleet-wide — by far the worst per-engine number (copilot/pi/claude are 88-90%) — driven by the codex-gh-aw-binary-not-found-for-mcp signature, open since 2026-06-15 (2+ months unresolved). Per this project's own memory (known_patterns.md), issue #41253 fixed this exact signature on 2026-06-24 but only for one workflow (Daily Cache Strategy Analyzer)'s config; the root cause lives in the shared codex/MCP setup path (likely pkg/workflow/codex_engine.go / pkg/workflow/mcp_setup_generator.go, where AWF/MCP binary installation steps are generated for the codex engine), so the same failure keeps resurfacing as more codex-engine callers are added. No dedicated open tracking issue for the shared-path fix currently exists (search for codex-gh-aw-binary-not-found and #41253 follow-up returned only the original closed, workflow-scoped fix).

Expected Impact

The audit calls this "the highest-ROI fix on the board" — fixing the shared code path (rather than per-workflow config) would eliminate the dominant recurring codex-engine failure cluster fleet-wide instead of requiring a new patch each time another workflow adopts the codex engine.

Suggested Agent

General-purpose engineering agent to trace the MCP binary path resolution for the codex engine in pkg/workflow/codex_engine.go and pkg/workflow/mcp_setup_generator.go, confirm where the binary path assumption breaks for non-Daily-Cache-Strategy-Analyzer workflows, and fix it in the shared path.

Estimated Effort

Medium (1-4 hours)

Data Source

DeepReport analysis, 2026-08-24 cycle — Daily Agentic Workflow Audit (#55173), cross-referenced with prior fix #41253 and known_patterns.md.

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• expires on Aug 25, 2026, 4:34 PM UTC-08:00