andy = {
    "is": "a full-stack engineer who builds agents — heaviest on the backend",
    "agent_layer": [
        "RAG — chunking, hybrid retrieval, reranking, citations",
        "prompt & context engineering — what goes in the window, and what doesn't",
        "MCP servers & tool calling — agents that change state, not just describe it",
        "evals — measure the pipeline instead of trusting the demo",
    ],
    "backend_under_it": [
        "FastAPI · SQLAlchemy · Alembic · Postgres · Redis",
        "Kafka for the async seams, Kubernetes and Docker to run it",
        "a model layer that swaps Anthropic/OpenAI/DeepSeek/Gemini",
    ],
    "also": "computer vision, trained and shipped on-device",
    "off_duty": "photography — 7M views / 57K downloads on Unsplash",
    "education": [
        "MIT (Artificial Intelligence) @ UNSW Sydney (2025–2026)",
        "BSc Computer Science @ University of Toronto",
    ],
    "before_agents": "4 years full-stack — commonsku, SnapPay",
    "based_in": "Shanghai · remote",
}

Agent harness UI & tooling — extensions for the pi coding agent, built because a long-running agent kept breaking. Sorted by npm downloads (last month).

github.com/Andy8647/pi-toolbox: one consistent frame around every tool call — built-ins, MCP, subagents — with bash syntax highlighting.

github.com/Andy8647/pi-starline: Starline — a Starship-inspired statusline and Opencode-style TUI for pi. Pill footer with directory, git branch & status, runtime detection, context usage, token counts and cost at a glance; themeable colour palette with $ref expansion, fully custom footerFormat templates, model/thinking segments; bordered editor with accent rail, per-mode cursor styles and mouse selection. Forked from pi-zentui, since diverged well past upstream.

github.com/Andy8647/pi-balance: real-time API provider balance in the pi status bar — DeepSeek, Moonshot, OpenRouter, Codex and more.

github.com/Andy8647/pi-ide-context: /ide for pi. Select text in Neovim or VS Code, switch to the agent — it already knows the file, cursor and selection. No copy-paste.

github.com/Andy8647/pi-agent-loop: cross-provider rate-limit detection and auto-resume. Tells a soft quota limit apart from a hard 403, waits for the real reset, picks the task back up.

Upstream contributions

github.com/nicobailon/pi-powerline-footer: 4 merged PRs — opt-in git host icon (GitHub/GitLab/Bitbucket), configurable display formats for context_pct/cache_read segments, session token-scan caching for perf, copyOnSelect config toggle.

pi install npm:@andy8647/pi-agent-loop
pi install npm:pi-ide-context
pi install npm:@andy8647/pi-toolbox

Agent internals — context engineering and the failure modes underneath

github.com/Andy8647/superpowers (fork): plan generation kept dying on long runs — past ~119K tokens prompt cache dropped to zero, and a 3,000-line plan in one response got the stream killed. The fix was structural, not prompt-level: split plans into an index plus self-contained per-task files, so the controller reads only the index and each subagent reads only its own task. 9 files, +216/−108.

github.com/Andy8647/pdf-injection-scanner: finds prompt injection hidden inside PDFs before an agent reads them — white text, 0.1pt fonts, content positioned off-page.

github.com/Andy8647/agent-atlas: interactive learning platform for the agent application layer — ReAct through harness engineering.

Computer vision — trained, converted, shipped to a device

github.com/Andy8647/MahjongVis: real-time mahjong tile recognition on iPhone. 3,713 self-annotated images across 42 classes, YOLOv8s trained 150 epochs, converted to CoreML with built-in NMS, running live through SwiftUI + AVCaptureSession.