didrod205

Local-first developer tools · Tooling for AI coding agents · Frontend & technical SEO

What I do

I build small tools that do one thing, deterministically, on your own machine — no API keys, no accounts, nothing uploaded. Most of them started as "I need this and the only option is a website I'd have to paste a live token into."

Four lines of work:

Tooling for AI coding agents	Harnesses, audits and MCP servers — the plumbing that keeps a long agent task from falling apart
Browser tools that upload nothing	22 of them, running fully client-side. Drop in a JWT, a PDF, a screenshot — it never leaves the tab
Zero-dependency CLIs & libraries	51 packages on npm. Linters that fail your CI for a reason, and tiny libraries that stay tiny
Products	Apps in Toss mini apps, web services, and local-first tools people actually keep using

Day job side: React / Next.js / TypeScript, and making sure what I ship is legible to search engines and answer engines alike (SEO · AEO · GEO).

const me = {
  building: ["agent tooling", "local-first tools", "small web products"],
  values:   ["deterministic", "zero-dependency", "nothing uploaded"],
  stack:    ["TypeScript", "React", "Next.js", "Node"],
} as const

Tooling for AI coding agents

_{The newest thing I work on, and the part I'd point at first.}

• oh-my-fable — a harness for long agent tasks: plan first, self-correct, and never lose the thread when the process dies halfway through.
• fable-audit — an autonomous codebase audit that survives crashes. Plans the audit, reads your actual files, resumes where it stopped.
• oh-my-mcp — lint your MCP server before a model chokes on it. Catches tool definitions that read fine to a human and terribly to an LLM.
• korean-patent-mcp — MCP server that answers whether a Korean patent is still in force, from KIPRIS Plus. Three tools, no guessing.
• ai-readme-generator — reads a codebase and writes the README it should have had.

Paste it in your browser — nothing is uploaded

The most convenient dev tools are websites you paste sensitive data into. These are the same tools, rebuilt to run entirely in your tab.

🕶️ shadowbuster That black redaction bar isn't redaction — it's a sticker. Drop a PDF, Word, Excel or PowerPoint and read what's under it. ▶ Live	🎣 can-i-be-phished Can a scammer send mail as your hospital, school or charity? Checks a domain's DMARC and SPF and says so plainly. ▶ Live
🔍 jwtlens Decode, audit & verify JWTs — signatures checked with Web Crypto, offline. ▶ Live	🧽 scrubpii Redact PII & secrets from a payload, with pseudonyms that keep referential integrity. ▶ Live

Security & privacy · csp-doctor (CSP XSS holes) · cookie-doctor (Set-Cookie flags) · scrubpix (strip EXIF/GPS) · unspook (invisible / Trojan-Source / homoglyph chars) · entropass (passwords + strength) · checkdigit (Luhn / IBAN / ISBN)

Text, color & media · is-this-ai-slop (AI-writing tells, with zero AI) · readlevel (readability) · spellnum (numbers → words, EN/KO) · huebrew (image → palette) · dichroma (color-blindness simulation) · captionkit (subtitles) · calforge (.ics + add-to-calendar)

Things I made because I wanted the answer · fake-star-detector (are those stars bought?) · wiki-beef (the pettiest Wikipedia edit wars, live) · is-this-job-toxic · is-this-passive-aggressive · red-flag-green-flag

CLIs & libraries

_{TypeScript · zero runtime deps in the core · CLI + library · ESM + CJS · MIT.}

Linters that earn their place in CI · a11ylint (WCAG) · aeolint (SEO/AEO + rich-result eligibility) · apilint (OpenAPI) · datalint (CSV/TSV quality) · envlint (.env secrets & schema) · i18nlint (translation files) · licenselint (license audit + SBOM) · linklint (dead links & anchors) · maillint (HTML email compatibility) · docsanity (docs-site health) · actionbudget (CI-minute waste) · tsconfig-doctor (strictness & footguns) · will-it-redos (catastrophic regex)

Tiny libraries · pennywise (exact BigInt money) · nanocsv (CSV parser) · verspec (SemVer) · croniq (cron) · tempora (human time, ~1KB) · okcolor (OKLab/OKLCH + WCAG) · fuzzrank (fzf-quality matching) · fetchwise (retries/backoff/timeouts)

For fun, still deterministic · coderecap (Wrapped, for your git history) · shellrecap (Wrapped, for your shell) · works-on-my-machine (env fingerprint, paste-safe) · its-not-dns (it was DNS)

Products

Apps in Toss mini apps and small web services, plus local-first tools built for a real habit rather than a demo:

• hunch — 판단을 기록하고 확률로 채점하는 결정 저널
• memoro — 개발자를 위한 간격 반복 학습
• netto — 청구한 돈이 실제로 들어왔는지 세금까지 맞춰 추적
• recur — 계좌를 연동하지 않는 정기 결제 관리

Stack

Sponsor

Find these useful? Sponsor on GitHub — it keeps them maintained.