🛠️ All DevTools

[Other] I let AI build a tool to help me figure out what was waking me up at night

[Other] If AI writes your code, why use Python?

[Other] Show HN: E2a – Open-source email gateway for AI agents We were building an agent system and wanted email as a trigger. We decided to take it out and made it a standalone service.<p>The primary email features we wanted and used for our own agent system:<p>1. Email threading stays consistent with agent conversation threading<p>2. Human in the loop review for outbound emails (especially during testing phase)<p>3. Quick onboarding&#x2F;offboarding email addresses for agents within minutes<p>4. Websocket for local agents and at-least-once webhook delivery for Cloud agents<p>Not yet: DMARC (only SPF&#x2F;DKIM today), scoped API keys, HA&#x2F;multi-region (single VM + single Postgres), app-layer email data encryption, compliance attestations (SOC 2&#x2F;HIPAA).<p>GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;Mnexa-AI&#x2F;e2a" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;Mnexa-AI&#x2F;e2a</a><p>Hosted: <a href="https:&#x2F;&#x2F;e2a.dev&#x2F;" rel="nofollow">https:&#x2F;&#x2F;e2a.dev&#x2F;</a><p>Appreciate any feedback &#x2F; contributions.

[IDE/Editor] Show HN: OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity Hi. I’m a high school student studying for my GCSEs. I was using Google Antigravity heavily for my side projects, but I kept hitting the usage limits, and getting random &quot;agent terminated&quot; errors. So I decided to try build my own version of the IDE. I love the UI, so I copied it as accurately as possible, and then hooked up some logic into it, including the INCREDIBLY finicky webcontainer api.<p>I tried to keep it super lightweight, no build steps, or dependencies, and now that its open source, I&#x27;m hoping people can build things on top of it that arent possible with closed source tools, like complex custom agent workflows.<p>Some screenshots: - <a href="https:&#x2F;&#x2F;github.com&#x2F;ab-613&#x2F;OpenGravity&#x2F;blob&#x2F;main&#x2F;examples&#x2F;screenshot.png?raw=true" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;ab-613&#x2F;OpenGravity&#x2F;blob&#x2F;main&#x2F;examples&#x2F;scr...</a> - <a href="https:&#x2F;&#x2F;github.com&#x2F;ab-613&#x2F;OpenGravity&#x2F;blob&#x2F;main&#x2F;examples&#x2F;html%20site%20example.png?raw=true" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;ab-613&#x2F;OpenGravity&#x2F;blob&#x2F;main&#x2F;examples&#x2F;htm...</a><p>What it&#x27;s made from:<p>- Pure Vanilla JS: no react, vue, or build step. Built entirely in plain HTML&#x2F;CSS&#x2F;JS to keep it super lightweight.<p>- WebContainer API and xterm.js: Instead of faking a terminal, I (after much pain) hooked up the WebContainer API so the AI agent has a real, in browser linux environment to run shell commands, install dependencies, and edit local files.<p>- BYOK (Bring Your Own Key): API key ALWAYS stays in localStorage.<p>Whats currently happening:<p>- It works, but it&#x27;s an alpha. The AI can proactively start projects going properly and edit files, but because I built this over a few days before my exams, a lot of the UI dropdowns and buttons are currently just hardcoded placeholders.<p>- I’m open sourcing it early because I think the foundation of a Vanilla JS + WebContainer IDE is really strong, and I&#x27;d love to see where the community takes it while I&#x27;m doing my exams.<p>- Live demo: <a href="https:&#x2F;&#x2F;opengravity.pages.dev" rel="nofollow">https:&#x2F;&#x2F;opengravity.pages.dev</a> (Zoom out to 80% if not full screen. It will prompt for a gemini api key on load). Start by uploading a folder, then you can fiddle with the terminal and agent, and see how it goes!<p>Would love to hear feedback on the code, the WebContainer integration, or how to improve the agent loop!

[CLI Tool] Linux Terminal Memory Usage

[Other] CUDA-oxide: Nvidia's official Rust to CUDA compiler

[Database] Show HN: SLayer, a semantic layer maintained by your agent Hello HN!<p>If you want to connect your agent to a database (say, to build a data analyst chatbot or any kind of agentic app) today you have 2 options: an SQL MCP server or a semantic layer.<p>SQL MCP is the easiest path to setup, especially if you also have a .md knowledge base which the agent can update. It gets quite messy quickly though, especially if there&#x27;s many interactions or DB is large. Generated SQL is hard to review if you want to understand where the numbers came from, and related queries can be hard to align and compare.<p>The natural alternative is a semantic layer, which is an inventory of what data is available&#x2F;useful (data models) and an interface for querying it using a structured DSL — usually a list of measures, dimensions, filters, with joins etc. handled under the hood.<p>When we needed a semantic layer at Motley for connecting to our customers&#x27; data, we first settled on Cube with custom wiring for multi-tenancy and updating the models on the fly. We quickly hit some limitations which led us to realize existing semantic layers just weren&#x27;t built for the purpose: they&#x27;re still a part of the BI world where you want an efficient backend for an essentially static set of human-curated dashboards, whereas agents need to iterate their way to the answer, learning in the process. That&#x27;s when we built the first version of SLayer, which is now open-source.<p>Using either SLayer MCP or CLI, agents (and humans) can:<p>- Explore models, run queries, connect to multiple databases<p>- Edit columns&#x2F;measures or create new ones<p>- Create custom models from SQL or from a query on other models<p>- Learn from interactions: save and retrieve natural-language memories linked to models, columns or queries, to form a knowledge base<p>Agents evolve the semantic layer, reuse the results of past interactions, and make fewer mistakes going forward.<p>A few more features:<p>- Auto-creation of models from introspecting your DB schema for a warm start<p>- Embeddability — doesn&#x27;t need a server running<p>- Python client for doing data analysis with dataframes<p>- Schema drift detection and handling<p>- Expressive DSL with compact, natural representations for arbitrarily deep multistage queries, custom aggregations, time shifts, combining metrics from multiple models, and other features that are tricky to get right in raw SQL<p>On the roadmap: access controls, caching, and more.<p>Repo: <a href="https:&#x2F;&#x2F;github.com&#x2F;MotleyAI&#x2F;slayer" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;MotleyAI&#x2F;slayer</a><p>Docs: <a href="https:&#x2F;&#x2F;motley-slayer.readthedocs.io&#x2F;en&#x2F;latest&#x2F;" rel="nofollow">https:&#x2F;&#x2F;motley-slayer.readthedocs.io&#x2F;en&#x2F;latest&#x2F;</a>

[Other] Show HN: I built Tokenyst to stop getting shocked by Claude Code API bills

[Other] Google says criminal hackers used AI to find a major software flaw Unlocked: <a href="https:&#x2F;&#x2F;www.nytimes.com&#x2F;2026&#x2F;05&#x2F;11&#x2F;us&#x2F;politics&#x2F;google-hackers-attack-ai.html?unlocked_article_code=1.hlA.vW7Y.pO_0G8yLYoca&amp;smid=nytcore-android-share" rel="nofollow">https:&#x2F;&#x2F;www.nytimes.com&#x2F;2026&#x2F;05&#x2F;11&#x2F;us&#x2F;politics&#x2F;google-hacker...</a>, <a href="https:&#x2F;&#x2F;archive.ph&#x2F;I4Ui5" rel="nofollow">https:&#x2F;&#x2F;archive.ph&#x2F;I4Ui5</a><p><a href="https:&#x2F;&#x2F;apnews.com&#x2F;article&#x2F;google-ai-cybersecurity-exploitation-mythos-926aea7f7dc5e0e61adce3273c55c6d4" rel="nofollow">https:&#x2F;&#x2F;apnews.com&#x2F;article&#x2F;google-ai-cybersecurity-exploitat...</a><p><a href="https:&#x2F;&#x2F;www.cnbc.com&#x2F;2026&#x2F;05&#x2F;11&#x2F;google-thwarts-effort-hacker-group-use-ai-mass-exploitation-event.html" rel="nofollow">https:&#x2F;&#x2F;www.cnbc.com&#x2F;2026&#x2F;05&#x2F;11&#x2F;google-thwarts-effort-hacker...</a>

[Other] Create a 90s GeoCities style website in seconds (Python)

[Other] #1 Persistent memory for AI coding agents based on real-world benchmarks

[CLI Tool] Ratty – A terminal emulator with inline 3D graphics

[Monitoring/Observability] Traceway: MIT-licensed observability stack you can self-host in ~90s

[Other] 7 lines of code, 3 minutes: Implement a programming language (2010)

[Code Quality] Show HN: adamsreview – better multi-agent PR reviews for Claude Code I built adamsreview, a Claude Code plugin that runs deeper, multi-stage PR reviews using parallel sub-agents, validation passes, persistent JSON state, and optional ensemble review via Codex CLI and PR bot comments.<p>On my own PRs, it has been catching dramatically more real bugs than Claude’s built-in &#x2F;review, &#x2F;ultrareview, CodeRabbit, Greptile, and Codex’s built-in review, while producing fewer false positives.<p>adamsreview is six Claude Code slash commands packaged as a plugin: review, codex-review, add, promote, walkthrough, and fix. I modeled it after the built-in &#x2F;review command and extended it meaningfully.<p>You can clear context between review stages because state is stored in JSON artifacts on disk, with built-in scripts for keeping it updated.<p>The walkthrough command uses Claude’s AskUserQuestion feature to walk you through uncertain findings or items needing human review one by one. Then, the fix command dispatches per-fix-group agents and re-reviews the work with Opus, reverting any regressions before committing survivors.<p>It runs against your regular Claude Code subscription (Max plan recommended), unlike &#x2F;ultrareview, which charges against your Extra Usage pool.<p>I would love feedback from Claude Code users, pro devs, and anyone with strong opinions about AI code reviews.<p>Repo: <a href="https:&#x2F;&#x2F;github.com&#x2F;adamjgmiller&#x2F;adamsreview" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;adamjgmiller&#x2F;adamsreview</a><p>Install: &#x2F;plugin marketplace add adamjgmiller&#x2F;adamsreview, &#x2F;plugin install adamsreview@adamsreview

[Other] I'm going back to writing code by hand

[Other] An AI coding agent, used to write code, needs to reduce your maintenance costs

[Other] Obsidian plugin was abused to deploy a remote access trojan

[Other] Incident Report: CVE-2024-YIKES

[Other] Louis Rossmann offers to pay legal fees for a threatened OrcaSlicer developer