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Hey HN, We&#x27;re Gus and Carlos from Runtime (<a href="https:&#x2F;&#x2F;runtm.com">https:&#x2F;&#x2F;runtm.com</a>). We&#x27;re building infra that lets your whole team (including non-engineers) ship with Claude Code, Codex, and other agents without engineering having to handhold every session.After Mentum (YC S21) was acquired, I personally shipped 4 full-stack products in 3 months using coding agents. When I tried to roll the same workflow out to the rest of the team, it fell apart: Most PRs were unmergeable slop - Every repo required an engineer doing one-off local setup. - Skills and context lived in one person&#x27;s head. - There was no safe way for a PM to touch a real codebase without risking a bad deploy or a secrets leak.Carlos comes from building agentic reconciliation systems at Modern Treasury and had a similar experience when letting his support team use devin.We ended up building internal background agent infra but it quickly became a nightmare to mantain and develop. We built Runtime so you don&#x27;t have to do this kind of thing.Runtime work like as follows. Engineering defines the context once: system instructions, skills, and scoped integrations installable via CLI, mise, npm, or any package manager. Then Runtime snapshots your full running environment including multi-service Docker Compose setups, Kafka, Redis, seeded DBs, so it comes up in milliseconds with every server already running.We orchestrate across sandbox providers like E2B, Daytona, EC2 or self-hosted K8s depending on your setup. Secrets are injected through our managed proxy so they never touch the agent directly, and guardrails run at the infrastructure level: command allow&#x2F;deny lists, network egress controls, and RBAC scoped per human and per agent. Every session also gets a shareable preview URL, so internal builds go from sandbox to the rest of the team without needing production access.Runtime works with whichever agent your team already uses: Claude Code, Codex, Cursor, Copilot, Gemini, Devin. You can trigger sandboxes from our web app, CLI, Slack, Linear, GitHub, or API.One of our customers built an on-call inspector that wires PagerDuty, Sentry, and their repo so when an alert fires, the agent finds the cause and opens a PR with a unit test before anyone gets paged. Another runs a finance agent in a private Slack channel pulling from Stripe, NetSuite, and Snowflake to run reconciliations in minutes with source rows attached.A fintech unicorn and several YC scaleups are live on Runtime, including a few teams who had built similar infrastructure internally and handed it to us to take over.The core is open source at <a href="https:&#x2F;&#x2F;github.com&#x2F;runtm-ai&#x2F;runtm" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;runtm-ai&#x2F;runtm</a>. Hosted version is live at <a href="https:&#x2F;&#x2F;app.runtm.com">https:&#x2F;&#x2F;app.runtm.com</a>, free tier included. We&#x27;re charging a flat platform fee plus compute, no token markup.Check our demo: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=wLwj__aEEh4" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=wLwj__aEEh4</a>We&#x27;d love to hear how you&#x27;re thinking about the infra for letting more people across your org use coding agents without creating chaos!

Launch HN: Runtime (YC P26) – Sandboxed coding agents for everyone on a team

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Author here. RMUX started from a frustration: I&#x27;ve used tmux for years and got tired of scraping output with grep and sleeps to automate anything. So I rebuilt the multiplexer from scratch in Rust, with a programmable layer on top.Two surfaces: a tmux-compatible CLI (~90 commands, your keybindings just work), and a typed async Rust SDK on the same daemon — stable pane IDs, structured snapshots, locator-style waits. The idea is Playwright-style automation, but for terminals.Native on Linux, macOS, Windows (real ConPTY, no WSL).Demos and docs at rmux.io. Happy to answer questions about the daemon protocol, ConPTY, or the SDK design.

Show HN: Rmux – A programmable terminal multiplexer with a Playwright-style SDK

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Ever since Apple introduced their video wallpapers I wanted to be able to put custom videos there. I decided to reverse engineer and see what I can do.I built Phosphene to sell it, but the existing competitors were polished enough that the time it would have taken to catch up wasn&#x27;t going to pay off. So I&#x27;m open-sourcing it.WallpaperExtensionKit.framework is what powers macOS wallpapers. It controls what’s shows in the Settings app. It took a lot of trial and error to replicate the behavior, but the result is that your custom wallpapers appear alongside everything else. I wanted to have an “add” button there too, but I couldn’t find a way to do so, so there’s a companion app that will put your video where it needs to be.Unlike Apple&#x27;s Aerials, the video keeps playing on the desktop (not just the lock screen). The renderer drives AVSampleBufferDisplayLayer directly with PTS-offset gapless looping, and pauses or downshifts based on thermal state, battery level, brightness, and window occlusion.It’s free and works well.

Show HN: I reverse engineered Apple's video wallpapers

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Previous thread in sequence:GitHub is investigating unauthorized access to their internal repositories - <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=48201316">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=48201316</a> - May 2026 (321 comments)

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<a href="https:&#x2F;&#x2F;www.nytimes.com&#x2F;2026&#x2F;05&#x2F;15&#x2F;science&#x2F;archaeology-egypt-mummy-iliad.html" rel="nofollow">https:&#x2F;&#x2F;www.nytimes.com&#x2F;2026&#x2F;05&#x2F;15&#x2F;science&#x2F;archaeology-egypt...</a> (<a href="https:&#x2F;&#x2F;archive.ph&#x2F;2jmQ2" rel="nofollow">https:&#x2F;&#x2F;archive.ph&#x2F;2jmQ2</a>)

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4:21:10 PM THURSDAY MAY 21, 2026

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