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Documentation Index

Fetch the complete documentation index at: https://docs.feral.sh/llms.txt

Use this file to discover all available pages before exploring further.

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Starting Chrome with Debug Port

# Linux
google-chrome --remote-debugging-port=9222 --user-data-dir=/tmp/feral-chrome

# macOS
open -a "Google Chrome" --args --remote-debugging-port=9222 --user-data-dir=/tmp/feral-chrome
FERAL auto-launches Chrome if no running instance is detected on port 9222.

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Configuration

VariableDefaultDescription
FERAL_CDP_PORT9222Chrome DevTools Protocol port
FERAL_CDP_HOSTlocalhostCDP host address

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Troubleshooting

  • Connection refused on port 9222 — Chrome isn’t running with --remote-debugging-port=9222. Start it manually or let FERAL auto-launch.
  • Profile lock / conflicts — Two Chrome instances sharing the same --user-data-dir will conflict. Use a dedicated dir like /tmp/feral-chrome.
  • Playwright not available — FERAL falls back to raw CDP. Install playwright and run playwright install chromium for full click/type support.
  • Stale page refs — ARIA refs are tied to the latest snapshot(). If a ref stops working, take a fresh snapshot.
  • Checking logs — Browser logs under feral.skill.browser. Set FERAL_LOG_LEVEL=DEBUG for per-CDP-method elapsed_ms timing.