Spotify Engineering describes Portal AiKA Modes plus a Claude Code plugin called shunt: PreToolUse hooks intercept large-file Read/bash I/O and route work through Portal CLI bulk-reader / code-writer modes (examples use Gemini 2.5 Flash), keeping frontier Claude for real reasoning. Across four Java monorepo scenarios, mean bulk-read savings were about 90% Claude tokens. Install from the spotify/portal-ai-plugins marketplace.

Key Takeaways

  • ✓shunt hooks block large Read/bash I/O and force Portal delegation.
  • ✓bulk-reader / code-writer modes run cheap workers (e.g. Gemini 2.5 Flash) with no infra to manage.
  • ✓Mean ~90% Claude token savings on bulk-read in a Java monorepo; marketplace: spotify/portal-ai-plugins.
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