printemps.tokyo

Inspect JPEG XL files without decoding them: container boxes, codestream headers, and web-delivery checks. Offline Rust CLI, no libjxl.

Chrome side panel that reads the page with the browser's own on-device model: what an AI takes away, whether the point you wanted to land survived, and what makes the page hard to cite. Nothing leaves the device.

Deterministic sprite atlas packer CLI for CI: TexturePacker-style JSON, Phaser 3 multiatlas, Godot 4 .tres, CSS, and a --check mode that fails the build when the atlas is stale

Audit your repo's AI agent instruction files (AGENTS.md, CLAUDE.md, .cursor/rules, copilot-instructions) for cross-tool portability: which agents would load nothing, duplicated or contradicting content, broken @imports and links, nesting precedence, and token bloat. Cited sources, fixes, JSON, CI exit codes. Rust CLI.

Two questions about your CSS: what is not safe for your target yet, and which safety nets can you finally delete? Audits a codebase against Web Platform Baseline in both directions - risky features, and now-redundant prefixes, dead @supports guards and polyfills. Verified web-features snapshot. Rust CLI.

Slice a 40,000px webtoon canvas without cutting through a face. Finds the gutters between panels and cuts there, as close to your target tile height as possible; hard cuts are reported, never hidden. Platform presets with sources, --dry-run, --check for pre-upload validation. Rust CLI.

Find the code that dies on a deadline. Scans a repo for dependencies on APIs with announced shutdown dates (OpenAI Assistants API, Content API for Shopping and more) and reports file:line, days remaining, and the official migration path. Data-driven catalog with cited sources, CI exit codes. Rust CLI.

Audit an open source repo for the security practices downstream companies now ask about: SECURITY.md with a real reporting channel, license, lockfiles, CI tests, unpinned Actions, release checksums, committed secret-bearing files. Graded report with sources and fixes. Rust CLI. Preparation aid, not legal advice.

See your pages' real-user Core Web Vitals from the Chrome UX Report: p75 LCP/INP/CLS (plus FCP/TTFB) graded against official thresholds with good/needs-improvement/poor distribution, per form factor, --history sparklines, JSON, and CI exit codes. Stdlib-only Go CLI.

Audit an MCP server for readiness against the 2026-07-28 stateless MCP spec: flags session reliance, legacy draft-04 tool schemas (vs JSON Schema 2020-12), deprecated task methods, and missing cache hints, with a graded report and CI exit code. Stdlib-only Go CLI, stdio and Streamable HTTP.