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hermes - 💡(How to fix) Fix Agent builds run at 100% CPU, bringing the machine down

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Bug Description

When the Hermes CLI agent actually manages to build something (rare, given #22397), it runs at 100% CPU, making the machine unusable.

Steps to Reproduce

  1. Get an agent to actually write code
  2. Observe CPU usage spike to 100%
  3. Machine becomes unresponsive

Expected Behavior

  • CPU usage should be reasonable
  • Background builds should use nice or CPU limits
  • Agent should not bring the host machine down

Actual Behavior

  • 100% CPU sustained during builds
  • System unresponsive
  • No CPU throttling or priority management

Environment

  • Platform: CLI (macOS)
  • Hermes version: current main (2026-05-09)

Related Issues

  • #22397 — Agent loops indefinitely with read/grep cycles

Additional Context

User reports: When it does build something, it runs at 100% CPU, which brings the machine down. It is absolutely awful. This suggests either missing nice/cpulimit on spawned subprocesses, parallel builds spawning too many workers, or no resource guard in the agent loop.

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hermes - 💡(How to fix) Fix Agent builds run at 100% CPU, bringing the machine down