
The fastest way to understand any codebase. Interactive. Visual. Narrated step by step. Part of @Principal_AI_
Joined January 2026
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Replying to @theo
Amazing work - 76 PRs since Monday.
See what shipped this week on the map, and by who: app.principal-ade.com/pingdo…
In honor of @JensenHuang joining X
NVIDIA/NemoClaw as a File City.
Structure, who built what, what shipped this week, and more.
Every codebase has a shape.
See structure, who built what, what shipped, what a PR is changing, and more.
Replying to @jack
Great work @jack — here's buzz as a File City map.
Explore the full codebase → app.principal-ade.com/block/…
See any codebase as a map.
Structure, who built what, what shipped this week, and what a PR is changing.
Replying to @cursor_ai
Curious how it compares to the original?
We loaded both repositories into File City so you can explore.
app.principal-ade.com/sqlite…
app.principal-ade.com/cursor…
FileCity Tour: pi
A comprehensive AI agent toolkit with interactive coding agent CLI, unified multi-provider LLM API, TUI/web UI libraries, and more.
github.com/earendil-works/pi
FileCity Tour: lexa
A fast local code intelligence for humans and AI agents. Turns any codebase into a portable, queryable graph for stable context, symbols, searches, audits, and safe edits via CLI + MCP.
github.com/anvia-hq/lexa
FileCity Tour: activegraph
An event-sourced reactive graph runtime for long-running agentic systems. Behaviors react to a shared graph instead of direct messaging; every change is traceable, runs are resumable, forkable, and diff-able via the event log.
github.com/yoheinakajima/act…
FileCity Tour: stainful
An open-source Stainless alternative. Generate idiomatic, fully-typed Python SDKs from OpenAPI specs + stainless.yml configs. Runs locally with auto-pagination, retries, typed errors, streaming, sync/async — zero migration, no SaaS.
github.com/stainlu/stainful
FileCity Tour: deepsec
An agent-powered vulnerability scanner from Vercel Labs. Runs in your infrastructure to find hard-to-spot security issues in large codebases using coding agents.
github.com/vercel-labs/deeps…
FileCity Tour: open-slide
A slide framework built for agents. Describe your deck in natural language and let coding agents generate full React slides on a fixed 1920×1080 canvas with navigation, present mode, inspector, and easy export.
github.com/1weiho/open-slide
FileCity Tour: flue
The sandbox agent harness framework from Astro. Build headless, programmable TypeScript agents with sessions, tools, Markdown skills, and flexible sandboxes (virtual or full container). Deploy anywhere.
github.com/withastro/flue
FileCity Tour: mac-monitor
The missing ProcMon for macOS. Records and visualizes Endpoint Security events for security research, malware triage, and system troubleshooting with rich metadata, filtering, correlation, and analysis tools.
github.com/Brandon7CC/mac-mo…
FileCity Tour: agent-install
An one-API tool to install agent skills and MCP servers. Works seamlessly with Claude Code, Cursor, Codex, OpenCode, and 40+ others by writing to each agent's native config.
github.com/millionco/agent-i…
FileCity Tour: mike
An open-source AI Legal Platform. AI-powered tools for legal document processing, analysis, and workflows with Next.js frontend and Express backend.
github.com/willchen96/mike
FileCity Tour: opengithub
An open-source GitHub client that brings a beautiful, native-like experience for browsing repos, issues, PRs, and code.
github.com/namuh-eng/opengit…




