FxEmbed

fx is an open-source coding-agent harness and command-line interface written in Zig by Vercel Labs. It is designed as a compact Unix-like alternative to a terminal IDE, with interactive and one-shot requests for inspecting and modifying repository code, running shell commands, and saving or resuming sessions. The agent supports skills, MCP tools, plugins, subagents, permission rules, and headless requests, and can be embedded natively or through WebAssembly. It is model-agnostic, supports local and cloud inference, is distributed under the Apache-2.0 license, and is marked experimental by its repository.

The X For You Feed Algorithm is the open-source codebase powering the For You feed on X. It assembles each request from in-network posts kept in memory by Thunder from accounts a viewer follows and out-of-network posts discovered through Phoenix retrieval and SimClusters, then hydrates candidates with post, media, author, account-label, language, and engagement data. A separate blending pipeline can add ads, Who to Follow recommendations, and prompts. The post pipeline applies visibility filtering based on viewer actions such as blocks, mutes, and muted keywords, as well as labels produced by rule-based systems, account-scoring models, media models, and enforcement components. A transformer-based Phoenix model predicts the viewer’s probability of taking actions on each post and other continuous values; configured weights combine those predictions into a score, which ranks posts after filtering. The repository includes retrieval, labeling, filtering, scoring, ranking, Phoenix training and inference code, synthetic data generation for a proof-of-concept training run, and an Under the Hood tool that displays aggregate statistics about labels affecting account and post visibility.

Workers for Platforms is a Cloudflare offering that lets platform operators embed the Cloudflare Workers serverless runtime into their products, enabling customers to run user-provided server-side code at Cloudflare's edge. It is provided and maintained by Cloudflare and builds on the Cloudflare Workers ecosystem for distributed compute.

CogSend is a self-hosted social media scheduler that runs on the user's Cloudflare account. It lets users write a draft, customize it per platform, add images and alt text, automatically split long drafts into threads, and publish immediately or schedule posts for Mastodon, Bluesky, LinkedIn, Threads, and X. The scheduler reports delivery results per account, retries temporary failures, and supports cancellation, rescheduling, and manual retries; it also provides link previews and publication-failure insights. The application stores data in Cloudflare D1 and media in R2, sends posts through the user's API credentials, encrypts credentials, and protects the administrator account with two-factor authentication. It provides a personal API key and an MCP server for scripts, Shortcuts, Claude Code, Codex, or other MCP clients to draft, schedule, and publish posts. It is built with SvelteKit on Cloudflare Workers, uses Drizzle with D1 SQLite, and is licensed under the MIT License.

HyperFrames is an open-source framework for turning HTML, CSS, media, and seekable animations into deterministic MP4 videos. It can be used locally through a CLI, by AI coding agents through skills, or as a rendering core for hosted authoring workflows. Compositions are defined as HTML with data attributes for timing, tracks, media, and sub-compositions. The renderer seeks each frame in headless Chrome, uses animation adapters such as GSAP, CSS, Lottie, Three.js, Anime.js, or WAAPI, and encodes the result with FFmpeg; its toolchain includes preview, linting, inspection, local rendering, browser-based editing, reusable catalog components, and AWS Lambda rendering. The project requires Node.js 22 or newer and FFmpeg, does not require React or a build step, and is licensed under Apache 2.0. Its agent skills support workflows including product videos, explainers, pull-request videos, captions, motion graphics, slideshows, music-driven videos, and general compositions.