Agent Skills (SKILL.md) for Claude Code, Codex, Cursor, and Gemini CLI — only the expertise a frontier model doesn't already reliably know.
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Use when asked to research deeply, compare options or vendors, fact-check a claim, investigate an unfamiliar topic, prepare a report or briefing, build a knowledge base or reference doc, or trace a claim to its primary source.
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Use when building or restyling frontend UI and choosing building blocks — icon sets, fonts, component/block libraries, accessible primitives, imagery sources, color systems, motion, shadows, spacing, and image optimization. For landing pages, ecommerce, dashboards, web apps, emails, and single components.
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Senior Google Ads, single-account layer: plan, launch, audit, diagnose, scale one account. Search, PMax, Demand Gen, Shopping, AI Max, Smart Bidding, RSA, tCPA/tROAS, tracking/OCI, GAQL and API mechanics. Use for: 'why is CPA up', 'PMax cannibalizing brand', 'structure a Search account', 'which conversion action is…
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Google Merchant Center (GMC) launch and operation plus the retail data layer: new-account launch sequence (site trust → ToS → verify+claim → business info → shipping/tax → data source → review → programs → Ads link → first campaign), Merchant API v1 mechanics and the gmcops CLI, feed spec and attributes, feed rules…
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Launch and run Google Ads via the API from a developer token + OAuth/service account — the googleops CLI (workspace, doctor, plan=validateonly, apply PAUSED, verify read-back, activate, bulk across customers under an MCC), gmcops for Merchant Center — plus grey-market survival: agency/MCC account supply…
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Use when obfuscating JavaScript, building anti-detection layers, evading Google Safe Browsing, hiding payloads from scanners, adding anti-bot/anti-DevTools protection, or preparing phishing/red-team pages for deployment.
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Writes, audits, and compresses agent skills so they earn their tokens. Covers include-vs-cut, real expertise vs what the model already knows, sizing and progressive disclosure, description/trigger design, multi-file skills. For: write a skill for X, improve/shrink this skill, is this skill worth its tokens, my skill…
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Decide whether a media-buying result is real before scaling it: testing-mode choice (causal / screening / infrastructure), validity traps (SRM, peeking, contamination, lag, multiple testing), and the platforms' measurement tools — Meta (A/B Test, adstudy API, Conversion Lift, GeoLift, Robyn) and Google (Experiments…
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Senior Meta (FB/IG) ads, clean-marketing layer: plan, structure, audit, diagnose, scale an ad account — ODAX objectives, CBO/ABO, Advantage+ audiences and creative, attribution windows, Pixel/CAPI/EMQ, learning phase, creative fatigue, policy rejections, unit economics, API error codes. Use for: 'why is CPA up', 'ad…
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Launch and run Meta (FB/IG) ads via the workspace-bound Marketing API CLI (metaops): access/scopes/System User, MCP vs API, PAUSED bulk launch across ad accounts, edit/clone/rules, catalog/DLO/carousel creatives, catalog as an agent-edited Google Sheet, attribution 1/1/1, Advantage+ and multi-advertiser opt-out, EU…
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Use when building or restyling a website that should look like ordinary, long-running commercial web rather than a freshly art-directed product — B2B and professional services, online shops and catalogues, news and publishing, corporate and institutional sites, directories and portals. Covers the plain 2012–2020…
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Make an existing landing page, admin panel, dashboard, or any non-responsive page work at every viewport from 320px to 2560px+ without changing the visual design. Triggers on requests to make a page responsive, fix mobile layout or breakpoints, adapt a landing or admin to phones / tablets / widescreens, and on…
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Use when writing JavaScript, Node.js, HTML, CSS code for websites, landing pages, admin panels, APIs. Reduces common vulnerability classes (XSS, injection, SSRF, etc.) via secure libraries, proper headers, and safe patterns. Includes AI code vulnerability patterns.
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Senior media-buyer / team-lead operating layer (clean and grey portfolios alike): day-1 operating contract, portfolio allocation across accounts (test/scale/reserve), kill/watch/scale + marginal scaling, creative-intelligence pipeline, end-to-end funnel QA, cross-platform (Meta + Google) allocation. Orchestrates…
sergeyizmailov/knowledge-delta-skills
Skill Claude CodeCodex
Tracker ops for affiliate/media buying: Keitaro + Binom APIs (keys, reports, cost push), postback/S2S, metric discipline (payout event vs all-conversions, timezones, CPL math), daily spend-sync, gclid/OCI chain for Google. Principles port to other trackers.
sergeyizmailov/knowledge-delta-skills
Skill Claude Code
Mass crawl/scrape sites incl. anti-bot (Cloudflare, Akamai, DataDome, PerimeterX). Crawl4AI = scale (arunmany, dispatchers, deep crawl, LLM-ready markdown); Camoufox = fingerprint evasion. For: scrape N pages, crawl a site, extract structured data, 403/challenge/bot-detection, captcha.
At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: