--- title: "Workers" description: "13 posts about Workers, summarised, each linking to the original." --- # Workers > 13 posts about Workers, summarised, each linking to the original. ## Articles ### [Inside Hyperdrive: How we solved a rare Hyperdrive MySQL caching bug](https://yomu.fyi/post/inside-hyperdrive-how-we-solved-a-rare-hyperdrive-mysql-caching-bug.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Pranoy Dutta - Published: Oct 14, 2026 - Type: Incident / postmortem Hyperdrive is Cloudflare’s distributed database connection pooler for Workers; its MySQL support became GA after a beta that uncovered over 20 bugs, including a rare caching issue. The most challenging bug caused consistently empty query responses 0.001% of the time on cache-enabled instances, requiring deep protocol analysis. The root cause was that the Client and Endpoint nodes share a data center cache but use different MySQL capability flags, so a cache entry written by one node could be encoded with capabilities that the other node cannot correctly translate. When the reading node encountered such a mismatched entry, it either sent an early EOF or hung, resulting in empty rows for the Worker. The fix was to always write a canonical version of the query result bytes encoded with Hyperdrive’s own capabilities, regardless of which node stored it, which resolved the issue and raised reliability to the 99.99% target. ### [Introducing on-demand CPU and memory profiling with flamegraphs for Workers and Durable Objects](https://yomu.fyi/post/introducing-on-demand-cpu-and-memory-profiling-with-flamegraphs-for-wo.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Dominik Picheta - Published: Oct 9, 2026 - Type: Announcement Cloudflare introduced on-demand CPU and memory profiling for Workers and Durable Objects, accessible via the CLI or the Dashboard’s Observability page. Users can generate interactive flamegraphs and download pprof files, with each rectangle’s width representing CPU time or memory usage over a chosen duration. Profiling the R2 binding Worker revealed that genericR2JsonReplacer, called by JSON.stringify, processed nested values multiple times; fixing it made the function 2.7x faster. A different Worker with P999 memory at 133 MB (above the 128 MB limit) was found to have a partially enabled Prometheus code path accounting for 66.7% of allocations; disabling it reduced P999 memory to 118 MB and eliminated out-of-memory errors. The profiling system locates the correct data center and isolate for the Worker or Durable Object, and continuous profiling is being developed to automatically capture samples without manual initiation. ### [Deno is joining Cloudflare](https://yomu.fyi/post/deno-is-joining-cloudflare.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Ryan Dahl - Published: Oct 9, 2026 - Type: Announcement The Deno team is joining Cloudflare to merge workerd and celld, aiming to make self-hosting Workers and Durable Objects radically simpler for developers. Ryan Dahl, creator of Node.js and Deno, explains that Durable Objects provide a powerful abstraction: a distributed singleton with a SQLite database that scales by sharding state and WebSocket connections across machines. He started celld to run this model outside Cloudflare with a single Rust binary and object storage as its only external dependency. Kenton Varda counters the theory that Workers’ unique design creates lock-in, noting that workerd is open source and that celld provides an escape hatch for migration. The merged effort, led by Ryan and Bert Belder, will make self-hosting a first-class supported way to build and run apps using the Workers programming model. ### [Streamline: custom video pipelines with Cloudflare Stream and Workers](https://yomu.fyi/post/streamline-custom-video-pipelines-with-cloudflare-stream-and-workers.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Taylor Smith - Published: Oct 2, 2026 - Type: Announcement Cloudflare released Streamline, a developer playground that demonstrates how to build custom video pipelines using its Developer Platform. Streamline combines Workers, Containers, and Durable Objects to create long-running media processing sessions that can render dynamic annotations or burn in subtitles on livestreams and hosted videos. The architecture consists of a Media Engine running in a Container, controlled by a Worker application that handles orchestration and preview via Durable Objects. The Media Engine uses FFmpeg for processing and supports inputs from RTMPS, HLS, or webcam, with output to Cloudflare Stream or WebSocket preview. Streamline is open source, with repositories for the media engine and an example application, and a public playground is available for testing. ### [Introducing Cloudflare Traces: follow requests through our entire platform](https://yomu.fyi/post/introducing-cloudflare-traces-follow-requests-through-our-entire-platf.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Daniel Walsh - Published: Oct 2, 2026 - Type: Announcement Cloudflare Traces, in open beta, extends tracing beyond Workers to the full request path, capturing spans for security, transformations, cache, routing, Workers, and origin handling in one timeline. Users set a baseline sampling rate and use Trace Rules to override it for specific traffic, enabling targeted debugging without increasing volume across the domain. The feature accepts and forwards W3C traceparent headers for distributed tracing and exports spans via OTLP to any compatible backend, with no instrumentation required. It reveals why a request was blocked, which rule acted, whether the URL was rewritten, and where time was spent between cache, origin, and the application. Pricing, effective December 1, 2026, is based on ingestion and retention: free tier 0.5 GB daily with 7-day retention, paid plans 50 GB ingestion and up to 365-day retention. ### [We want you to build the next Git platform on Cloudflare](https://yomu.fyi/post/we-want-you-to-build-the-next-git-platform-on-cloudflare.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Zebulon Piasecki - Published: Oct 1, 2026 - Type: Announcement Cloudflare announced Artifacts, a programmable versioned filesystem speaking Git, is now in open beta for Workers Paid customers. Aimed at an era where AI agents write more code, Artifacts offers primitives for per-agent or per-task repositories, forking, versioned storage, and Git operations. New capabilities include deploying Artifacts repos to Workers via Workers Builds, managing repos from Workers with bindings, subscribing to push events for CI or review, setting US/EU data jurisdiction, and viewing metrics. Cloudflare is hosting a competition to build the next Git platform on Artifacts, requiring a 5-10 minute video and permissively licensed source code that reimagines agent coordination, review, and concurrent changes. Submissions close October 14, 2026; the first-place team wins $25,000 in Cloudflare credits and a trip to Cloudflare Connect, with three teams invited to San Francisco. ### [Support for modern cryptographic algorithms in Workers](https://yomu.fyi/post/support-for-modern-cryptographic-algorithms-in-workers.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Thibault Meunier - Published: Oct 1, 2026 - Type: Announcement Cloudflare Workers now provides opt-in support for post-quantum cryptographic algorithms ML-KEM and ML-DSA within the Web Crypto API, including ML-KEM-768, ML-KEM-1024, ML-DSA-44, ML-DSA-65, and ML-DSA-87. These algorithms enable key encapsulation via encapsulateBits and decapsulateBits, and signatures via sign and verify, along with helper APIs like getPublicKey and SubtleCrypto.supports for feature detection. The implementation is gated behind the webcrypto\_modern\_algorithms compatibility flag and is based on a draft WICG specification, meaning it is opt-in while the specification is still moving. Developers can now use native primitives instead of bundling separate cryptographic code, reducing application size and maintenance burden for developers. Libraries such as panva/jose for JWTs and panva/hpke for HPKE can delegate ML-KEM and ML-DSA to the runtime, enabling experimentation with post-quantum protocols and preparing for the migration. ### [Cut your AI spend with AI Gateway's Auto Router](https://yomu.fyi/post/cut-your-ai-spend-with-ai-gateway-s-auto-router.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Harrison Harnisch - Published: Sep 30, 2026 - Type: Announcement Cloudflare released Auto Router in public beta through AI Gateway. Set the model to “cloudflare/auto” and the gateway automatically routes each request to a model capable enough for the task, filtering by credentials, access controls, and provider health. A multi-head classifier on Workers AI assigns probabilities across 14 task categories and rates complexity, ambiguity, stakes, and context dependence on a 1-5 scale. A separate scoring matrix combines those signals with model benchmark results and token prices, applying an adaptive cost penalty and switching costs for cached contexts in long sessions. On an internal general knowledge-work benchmark of 97 tasks with three samples each, Auto Router achieved 86.6% success at $0.0084 per success, costing 35% of Claude Opus 5.5 and 80% of GPT-6 Sol while remaining free during beta. ### [The road to the agentic browser: A Kitesurf update](https://yomu.fyi/post/the-road-to-the-agentic-browser-a-kitesurf-update.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Celso Martinho - Published: Sep 28, 2026 - Type: Announcement Kitesurf, Cloudflare’s browser for AI agents built entirely on Workers, has received a major update. It now supports WebMCP, enabling agents to call site functions like searchFlights() instead of simulating clicks, and site owners can enable WebMCP with one switch. The browser passes over 730,000 Web Platform Tests, up 500,000 since launch, and adds support for CSS Layout, CSSOM, custom elements, URL-based module resolution, and improved iframe behavior. Efficiency optimizations reduce DOM traversal overhead, font fetching, and timer work, keeping CPU usage in line with launch benchmarks despite expanded capabilities. Kitesurf also gains full Browser Run API coverage, including Quick Actions from Worker bindings, and a terminal rendering mode using the Kitty protocol or ANSI text, with open-sourcing planned soon. ### [Supporting native Rust in Workers with the new Emscripten target for wasm-bindgen](https://yomu.fyi/post/supporting-native-rust-in-workers-with-the-new-emscripten-target-for-w.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Mitch Foley - Published: Sep 28, 2026 - Type: Announcement Cloudflare announced an experimental Emscripten target for wasm-bindgen, enabling native Rust code compiled with wasm-bindgen to run directly on Workers with full platform feature virtualization. This resolves the long-standing incompatibility between Emscripten and wasm-bindgen by having Emscripten drive the build while wasm-bindgen produces portable bindings included in Emscripten’s library system. The integration virtualizes timers, file system operations, and sockets atop Workers’ Node.js APIs, bringing significantly improved library compatibility for many previously unsupported Rust crates after minor patches to libraries like libc and socket2. Tokio async runtime support is achieved through WebAssembly JavaScript Promise Integration, which suspends blocking calls and returns control to the event loop without stalling. In testing, a Rust Minecraft server (Pumpkin) was deployed inside a Durable Object with TCP ingress using real Tokio sockets, persisting world state through Durable Object storage and supporting multiplayer connections. ### [Introducing Worker Previews: isolated preview environments for every change your agent makes](https://yomu.fyi/post/introducing-worker-previews-isolated-preview-environments-for-every-ch.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Nanda Syahrasyad - Published: Sep 22, 2026 - Type: Announcement Worker Previews gives every Git branch its own production-like environment with an isolated URL, configuration, state, and observability. Developers deploy a Preview using npx wrangler preview, which creates a separate Worker version with its own variables, secrets, and bindings, distinct from production, on a stable URL that updates with each push. Durable Objects and Containers automatically receive new namespaces per Preview, preventing state contamination across branches during migrations or schema changes. Each Preview supports full observability—logs, errors, metrics, and traces—scoped to that branch, enabling agents to autonomously test, catch failures, push fixes, and verify before production. The feature enables an Agent Development Lifecycle where every change is atomic, independently deployable, and revisable before merging to production. ### [Python Workers are now generally available](https://yomu.fyi/post/python-workers-are-now-generally-available.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Hood Chatham - Published: Sep 21, 2026 - Type: Announcement Cloudflare announced general availability of Python Workers, making Python a first-class language on its developer platform. The runtime now encapsulates type conversion so developers use Cloudflare bindings like D1 and Workers AI directly, without the previously required JavaScript glue code. Popular frameworks FastAPI, Django, and Flask run inside Workers via built-in ASGI and WSCI connectors that translate JavaScript requests into standard Python structures. A custom socket syscall implementation enables TCP connections for database drivers, unlocking Hyperdrive integration with PostgreSQL and MySQL, previously blocked by WebAssembly sandbox limits. Example projects include streaming from Bluesky Jetstream via Durable Objects, building an MCP server with the official Python MCP package, and creating a RAG system with Vectorize, with documentation now including Python examples alongside TypeScript. ### [Give every teammate and agent the right level of access to your Workers](https://yomu.fyi/post/give-every-teammate-and-agent-the-right-level-of-access-to-your-worker.md) - Company: [Cloudflare](https://yomu.fyi/company/cloudflare.md) - Author: Dina Kozlov - Published: Sep 15, 2026 - Type: Announcement Cloudflare has introduced resource-level access controls for Workers, allowing a teammate or agent to access one specific Worker rather than other resources in an account. Four roles define progressively broader capabilities: Metadata Read-Only exposes settings and observability data, Content Read-Only permits code or product-content reads, Editor allows content and settings changes without resource deletion, and Admin provides full control. These roles can be assigned to dashboard users or attached to scoped API tokens, supporting debugging without source exposure, code review without deployment, and CI/CD deployments limited to one Worker. Worker-level access also governs Durable Objects, while routes and Custom Domains require both Worker Editor access and Workers Routes permission; existing legacy permissions continue to work, but the new roles are recommended for granular access and are planned for D1, R2, and KV.