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Spotify's Portal Cut One Engineer's Claude Code Token Use ~90% With PreToolUse Hooks and a Delegation Skill
Spotify Engineering published Portal on 2026-09-03, built on AiKA Modes (declarative agents on ephemeral runtimes) that delegate bulk file reads and boilerplate generation to cheaper models while reserving frontier models for reasoning. The implementation is three layers: PreToolUse hooks that block reads over a configurable threshold, bash wrappers around the Portal CLI that report tokens, and a markdown skill telling Claude when to delegate. Mean bulk-read savings were around 90%, against a stated baseline of engineering leaders spending $200 to $2,000+ per developer per month on tokens; the shunt plugin is at spotify/portal-ai-plugins but Portal itself is not open source.
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