Contain Claude probe stdin EPIPE

[SDSLeon]

Summary

Contain Claude SDK probe-owned stdin EPIPE errors by routing probe child creation through a guarded spawn helper, while preserving non-EPIPE stream failures.

Motivation

Production supervisor reports showed write EPIPE during Claude-related status/auth refresh work. The Claude SDK probe can emit child stdin EPIPE after the short-lived probe process exits, outside the awaited query path; keeping that broken pipe local prevents noisy supervisor-level errors without hiding unrelated stream failures.

Testing

• pnpm run typecheck
• pnpm exec vitest run src/supervisor/agents/claude/probe.test.ts
• pnpm exec vitest run src/supervisor/runtime/agentAuthentication.test.ts
• pnpm exec oxlint --type-aware --deny-warnings "src/supervisor/agents/claude/probe.ts" "src/supervisor/agents/claude/probe.test.ts" "src/supervisor/agents/claude/sdkProbeWorker.ts" "src/supervisor/agents/claude/sdkProbeProcess.ts"
• pnpm exec oxfmt --check "src/supervisor/agents/claude/probe.ts" "src/supervisor/agents/claude/probe.test.ts" "src/supervisor/agents/claude/sdkProbeWorker.ts" "src/supervisor/agents/claude/sdkProbeProcess.ts"
• git diff --check
• pnpm run lint
• pnpm run fmt:check
• pnpm run test
• Not run; reason: used focused checks for the supervisor-only bug fix.

Screenshots

N/A - supervisor runtime change.

Linked issue

Closes #

  

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
lightcode-landing	Skipped		Jun 7, 2026 3:18am