The fastest way to understand any codebase. Interactive. Visual. Narrated step by step. Part of @Principal_AI_

Joined January 2026
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…
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In honor of @JensenHuang joining X NVIDIA/NemoClaw as a File City. Structure, who built what, what shipped this week, and more.
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A new way to see your codebase. Drop a repo. See the city.
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Every codebase has a shape. See structure, who built what, what shipped, what a PR is changing, and more.
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Replying to @jack
Great work @jack — here's buzz as a File City map. Explore the full codebase → app.principal-ade.com/block/…
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See any codebase as a map. Structure, who built what, what shipped this week, and what a PR is changing.
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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…
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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
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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
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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…
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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
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File City secured a sweet product placement in The Devil Wears Prada 2. Money well spent 😆
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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…
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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
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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
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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…
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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…
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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
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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…
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