---
title: "Claude Code"
description: "2 posts about Claude Code, summarised, each linking to the original."
---

# Claude Code
> 2 posts about Claude Code, summarised, each linking to the original.

## Articles

### [Portal by Spotify cut my Claude Code token usage by 90%](https://yomu.fyi/post/portal-by-spotify-cut-my-claude-code-token-usage-by-90.md)
- Company: [Spotify](https://yomu.fyi/company/spotify.md)
- Author: Spotify Engineering
- Published: Sep 3, 2026

Claude Code often spends frontier-model tokens on file I/O and predictable code generation rather than reasoning, motivating a routing setup built with Portal by Spotify’s AiKA Modes. The implementation defines two public modes—bulk-reader for multi-file analysis and code-writer for pattern-based generation—both shown with Gemini 2.5 Flash, while a Claude Code plugin named shunt enforces delegation through hooks, scripts, and skills. PreToolUse hooks block large Read and shell-based file reads above a configurable threshold, while scripts send files or references to ephemeral worker invocations without exposing the full file corpus or generated code to Claude’s context. In a Java monorepo benchmark, mean bulk-read savings were around 90%, although code-write savings were harder to measure. The approach does not suit editing or reasoning tasks: worker summaries lacked reliable line numbers, missed a subtle thread-safety bug, and added 10–30 seconds of latency, so targeted reads and Claude’s reasoning remain necessary.


### [Spotify’s Backstage Portal cut my Claude Code token usage by 90%](https://yomu.fyi/post/spotify-s-backstage-portal-cut-my-claude-code-token-usage-by-90.md)
- Company: [Spotify](https://yomu.fyi/company/spotify.md)
- Author: Spotify Engineering
- Published: Sep 3, 2026

Claude Code often spends frontier-model tokens on file I/O rather than reasoning, prompting a routing approach that sends predictable work to cheaper models. The post implements this with two public AiKA Modes in Spotify’s Backstage Portal: bulk-reader summarizes large file sets, and code-writer generates patterned files from a specification and reference file, using Gemini 2.5 Flash in the examples. A Claude Code plugin called shunt enforces delegation through PreToolUse hooks, scripts, and skills; reads above a configurable threshold, defaulting to 350 lines, are blocked and redirected. In tests on a Java monorepo, bulk-read saved around 90% of Claude’s tokens, while generated code can go directly to disk. The design does not cover editing or reasoning, and 10–30-second delegation latency makes small tasks counterproductive.