Work

Connect your own AI assistant to the retirement simulator, the Buffett letters, and every post on this site.

A stateless MCP server on AWS Lambda. The MCP page’s inspector sends the same requests the server’s automated tests use.

Model Context Protocol · TypeScript · AWS Lambda · Rust/WASM

Ask a question and get an answer drawn from 25 Berkshire Hathaway shareholder letters, 1998–2023, with the passages it used.

Retrieval over 673 embedded passages. Every answer shows its sources.

Claude Opus 5.5 · OpenAI embeddings · AWS Lambda

Change a withdrawal rate and 100,000 simulated retirements rerun in your browser.

Rust compiled to WebAssembly. The same engine answers the MCP server’s simulate_retirement tool.

Rust · WebAssembly

Paste a resume and get startup ideas with a business plan, market analysis, and technical recommendations.

Claude Sonnet 5.5 · AWS Lambda · TypeScript

Pour sand, water, fire, and stone into a pixel sandbox and watch simple rules take over.

Strip GPS and other metadata from a photo, turn it upright, and resize it without uploading it.

Hit targets to score points before time runs out.

A new puzzle every day. Reverse runs of tiles to sort 1 to 8 in as few flips as you can, then share your score.

Turns CSV into a JSON array, or into an object keyed by the first column.

Turns a JSON array, or an object of objects, into comma- or tab-separated CSV.

Pretty-prints or minifies JSON and reports the first syntax error.

Counts characters, words, lines, and paragraphs as you type, and ranks the 10 most frequent words.

Strips trailing spaces, shared indentation, and extra blank lines from text copied out of a terminal.