Kazuki Yamada, known as yamadashy, builds tools that make repositories and developer information easier to inspect. His projects include Repomix for packaging a codebase into model-readable context and Duvis for exploring disk use.[1][2]
Start with Repomix →
X Career
Yamada’s GitHub profile identifies him as a developer at Colopl and lists an interest in web frontend work. His public projects range from command-line tools to browser extensions and a feed aggregating company technology blogs. The profile supplies an employer association but no exact title or employment dates.[1]
Contributions
Turning a repository into a bounded input
Repomix combines repository content into a single file formatted for language models. It counts tokens, allows include-and-exclude rules and respects ignore files, helping a developer see what material will be supplied and how much context it consumes. It also checks for known credential patterns. Those checks are a preparation aid, not proof that every sensitive value has been removed.[2]
Two views of the same disk usage
Duvis scans directories and exposes both a structured JSON tree for scripts or agents and a browser view for people. It tags entries into categories such as cache, build output, logs and version-control data, so a user can investigate space consumption. Its stated role is read-only analysis: it does not delete files or recommend deletions.[3]
Source-specific reading instructions
Agent-readable packages skills for sources such as GitHub, arXiv papers, PDFs and web specifications. Each skill records the required tools and source terms, giving an agent a repeatable access path instead of a generic instruction to browse. The repository excludes sources whose terms prohibit programmatic access.[4]
Tools, writing & talks
Tools
Start here
Repomix
github.comA tool that packages a repository into model-friendly files with filtering, token counts and credential-pattern checks.
Begin with the filtering and token-count options on a small repository. Review the output before giving it to an external model.
Creator and maintainer[1][2]Original source- Google Sheets Tabs On Topchromewebstore.google.com
Browser extension that moves Google Sheets sheet tabs to the top of the window for easier navigation.
Catalog workOriginal source - GitHub DeepWiki Buttonchromewebstore.google.com
Browser extension adding a button to GitHub repositories for quick access to their DeepWiki pages.
Catalog workOriginal source - copilot-toysgithub.com
Collection of small experiments probing the patterns and limits of GitHub Copilot as a pair programmer.
Catalog workOriginal source - ccreadergithub.com
Read-it-later manager built on GitHub Issues, where every saved URL becomes an issue that Claude summarizes.
Catalog workOriginal source - agent-readablegithub.com
A collection of source-specific skills for retrieving technical reference material.
Repository owner[4]Original source - duvisgithub.com
A read-only disk analyzer with structured command-line output and interactive browser visualizations.
Repository owner[3]Original source - Laravel Blade Minify Directivegithub.com
Adds a @minify directive to Blade templates that compresses rendered HTML without changing the output.
Catalog workOriginal source - GitHub Code Wiki Buttonchromewebstore.google.com
Browser extension adding a button on GitHub repos that opens an LLM-generated wiki view of the codebase.
Catalog workOriginal source - PHPStan Friendly Formatterpackagist.org
PHPStan extension that formats errors with code snippets and color highlighting for more readable analysis output.
Catalog workOriginal source - Slack Channels Groupingchrome.google.com
Browser extension that automatically groups Slack channels by name prefix to keep the sidebar organized.
Catalog workOriginal source - Tech Blog RSS Feedyamadashy.github.io
One RSS stream aggregating engineering blog updates published by Japanese technology companies.
Catalog workOriginal source