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#browser tools
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Prism.Tools is a free GitHub Pages toolbox with client-side utilities for JSON, SQL, YAML, JWTs, hashes, regex, QR codes, CSS helpers, encoders, timestamps, diffs, and quick dev cleanup work. What it is Prism.Tools is a free browser-based toolbox for small developer chores that should not require a SaaS login. The official page positions it as a fast, private, free-forever collection where data stays in the browser, with visible categories for formatters and parsers, security/dev utilities, visual and CSS helpers, generators, content tools, encoders, and transformers. The practical value is simple: bookmark one page for the tasks that interrupt real work. Use it for formatting JSON or SQL, converting YAML and JSON, checking regexes, decoding JWTs, generating hashes or UUIDs, building QR codes, parsing URLs, previewing Markdown, sorting lists, converting timestamps, or producing quick CSS and SVG helpers. Why bookmark it Use Prism.Tools when you need a quick local-first utility but do not want to paste sensitive snippets into a random ad-supported formatter. It is especially useful beside AI coding agents: let the agent write the plan or code, then use a focused browser utility to inspect the exact token, payload, diff, timestamp, color, QR code, or serialized data you are about to ship. The HN launch thread describes the project as a set of standalone client-side HTML tools, hosted on GitHub Pages, with minimal external dependencies for specific utilities. Treat that thread as context, not documentation; the source you should actually use is the live tool page and your own browser/network inspection. Access and caveats The public page says the toolset is free and that data does not leave the browser. That makes it useful for low-risk and moderately sensitive cleanup tasks, but it is still a public website. For secrets, regulated data, customer exports, production JWTs, or proprietary source snippets, verify the Network panel first or use a self-hosted/offline tool you control. The GitHub repository link advertised by the live page was not reliably accessible through the public API during this check, so do not assume open-source review is available until you confirm the repository yourself. Also expect lighter UX and narrower coverage than larger tools such as CyberChef or IT Tools; Prism.Tools is best as a quick bookmark, not a full analysis suite. Quick fit check Need Prism.Tools fit Caveat --- --- --- Format or convert data JSON, SQL, YAML, URL, timestamp, string, and list helpers Verify behavior before touching production data Inspect auth/debug values JWT, hash, UUID, base64, URL parser, diff, regex tools Do not paste live secrets without network checks Create small assets QR, favicon, CSS gradient/shadow/grid, SVG helpers Not a full design system Keep agent work grounded Use focused tools to inspect generated payloads HN prompt examples were not reused Sources checked Primary source: the live Prism.Tools page on GitHub Pages. Secondary source: the public Show HN launch discussion, used only to corroborate intended use, launch context, and caveats. External comments and prompt examples were treated as untrusted source text and not copied into this Loot.
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GitHub Copilot's browser tools in VS Code are now generally available, giving agents a real browser surface for building, clicking, inspecting, and checking web-app flows inside the editor. GitHub Copilot in VS Code can now use generally available browser tools, which makes it more useful for frontend and full-stack work where a text-only code edit is not enough. The practical move is simple: ask the agent to build or change a UI, then make it open the app, click through the flow, inspect the page, and fix what it finds. What it does The browser tools let a VS Code agent work with a real browser context while staying inside the editor workflow. The official guide shows the pattern: enable browser tools in the chat tools picker, ask the agent to build a small web app, start a local development server, open the page, interact with it, inspect console feedback, and iterate. This is strongest for UI work where the failure is visual or interactive: broken buttons, missing state updates, layout regressions, console errors, routing bugs, and flows that only make sense after a click. Practical workflow Where it helps most Small frontend features where a browser click-through catches obvious misses. Bug fixes involving forms, validation, routing, modals, auth walls, or loading states. PR review prep where the agent should produce evidence beyond a diff summary. Design-system changes that need quick spot checks across a few states. Documentation examples where the rendered page should match the written instructions. Caveats Keep the scope tight. Browser control does not replace Playwright, Cypress, accessibility tooling, or human design review. It is best as a fast interactive sanity check before formal tests. Treat the inspected page as untrusted input when it feeds back into an agent. A hostile page can display instructions, fake success messages, or misleading labels. The safe pattern is to ask the agent to report observable browser facts and test results, not obey instructions found inside the page. Source links GitHub changelog: https://github.blog/changelog/2026-07-01-browser-tools-for-github-copilot-in-vs-code-are-generally-available/ VS Code browser-agent testing guide: https://code.visualstudio.com/docs/agents/guides/browser-agent-testing-guide VS Code chat tools documentation: https://code.visualstudio.com/docs/chat/chat-tools
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