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avanrossum/README.md

Alexander van Rossum

Systems architect. AI integrator. macOS developer.

Most of the interesting problems I work on live in the gap between "the technology works" and "the organization works" — where architecture decisions become business outcomes and the unsexy stuff determines whether anything holds together at scale.

I build tools, ship them, and write about what I find along the way at mipyip.com/blog.


macOS Apps

SideMark: A markdown editor built for working alongside AI agents. Three-way merge, per-hunk diff, git gutter, auto-save. When both you and Claude Code edit the same file, non-overlapping changes merge automatically. Open source · MIT · Electron

Actions: Quick-action launcher from the menu bar. Scripts, shortcuts, links, folders — one click away. Built with Electron, governed by Pass@1. Coming soon · Closed source · Releases

Panoptisana: Asana visibility from the menu bar. Tasks, projects, inbox, and detail views without opening a browser. Open source · Electron · TypeScript

JSON Editor: Synchronized tree, form, and raw editor views. Built with Electron, React, TypeScript, and CodeMirror 6. Open source · MIT · Electron

AI & Developer Tooling

claude-context-monitor: Monitors Claude Code context window usage. Know when auto-compaction is coming before it costs you a session.

mcp-anylist: MCP server for Anylist. Local-only, Claude-native grocery and meal planning integration.

nag-bot: Fuzzy reminders via Telegram. Randomized timing, escalating persistence. Built for brains that dismiss predictable notifications. Slightly insane. Still a work in progress.

Systems & Infrastructure

search_s3 · search_acm_certificates: AWS operational tooling for S3 object search and ACM certificate lookup across accounts.


The methodology

I develop under a methodology I call Pass@1 — governance-first AI development — where the goal is to implement correctly on the first attempt. Not by being careful. By removing the ambiguity that causes failures in the first place.

The governance documents — architecture specs, coding standards, constraint boundaries — aren't overhead. They're the mechanism that makes AI agents productive session after session.

Recent writing:

mipyip.com

Pinned Loading

  1. pmem-project-memory-tool-for-claude-code pmem-project-memory-tool-for-claude-code Public

    Local-first RAG memory for Claude Code. Semantic search over your project's docs, decisions, and history. No external APIs. Setup in 2 minutes.

    Python 1

  2. sidemark sidemark Public

    A markdown editor for macOS built for working alongside AI. Three-way merge, per-hunk diff, git gutter, auto-save. Free and open source.

    JavaScript 2

  3. panoptisana panoptisana Public

    A fast, focused Asana visibility tool for macOS: tasks, projects, inbox, and detail views from your menu bar

    TypeScript 1

  4. claude-context-monitor claude-context-monitor Public

    A simple, lightweight script to check the context length of your claude code sessions, and tell you when you are in danger of unexpected compaction

    Shell 1

  5. actions-releases actions-releases Public

    Releases for Actions - macOS quick action launcher