Turn a code change (diff, PR, branch, commit range) into a rich, self-contained interactive HTML explainer with Background / Intuition / Code / Quiz sections. Use for explain, walkthrough, code-change explanation, diff/PR/branch explainer requests — 설명서, 해설, コード解説, 代码讲解. Produces a single offline-capable HTML file with diagrams, callouts, and an accessible quiz.

Verify documentation references against the current codebase, propose updates for diff-affected docs, detect i18n translation drift, and lint translated docs for CJK style issues. Use to check if docs still match reality (broken file paths, CLI commands, config keys, env vars, scripts), to surface docs that may need updating after code changes, or to find stale or style-broken translations.

Use when setting up or optimizing developer workflows in a monorepo, managing mise tasks, git hooks, CI/CD pipelines, database migrations, or release automation. Invoke for development environment setup, build automation, testing workflows, and release coordination.

AI design specialist skill with DESIGN.md management, anti-pattern enforcement, optional Stitch MCP integration, and component library guidance. Covers typography, color systems, motion design (motion/react, GSAP, Three.js), responsive-first layouts, and accessibility (WCAG 2.2).

Drive Vercel's `deepsec` agent-powered vulnerability scanner end-to-end: installing the `.deepsec/` workspace, bootstrapping `INFO.md`, running cost-aware `scan` / `process` / `triage` / `revalidate` / `export` passes, gating PRs with `process --diff`, writing custom matchers, and triaging findings. Use whenever the user mentions deepsec, asks an agent to scan a repo for vulnerabilities, runs into `pnpm deepsec` / `bunx deepsec` commands, wants a CI-based PR security review, sees a `.deepsec/` directory, or asks about `INFO.md` / matchers / `process --diff` / `revalidate`, even when the tool name is not spoken. Deepsec scans are expensive (a single full scan can cost hundreds to tens of thousands of dollars) so the skill exists in part to keep the user from getting surprised.

Bug diagnosis and fixing specialist - analyzes errors, identifies root causes, provides fixes, and writes regression tests. Use for bug, debug, error, crash, traceback, exception, and regression work.

Database specialist for SQL, NoSQL, and vector database modeling, schema design, normalization, indexing, transactions, integrity, concurrency control, backup, capacity planning, data standards, anti-pattern review, and compliance-aware database design. Use for database, schema, ERD, table design, document model, vector index design, RAG retrieval architecture, migration, query tuning, glossary, capacity estimation, backup strategy, database anti-pattern remediation work, and ISO 27001, ISO 27002, or ISO 22301-aware database recommendations.

Guide for coordinating PM, Frontend, Backend, Mobile, and QA agents on complex projects via CLI. Use for manual step-by-step coordination and workflow guidance.

Design-first ideation that explores user intent, constraints, and approaches before any planning or implementation. Use for brainstorming, ideation, exploring concepts, and evaluating approaches.

Backend specialist for APIs, databases, authentication with clean architecture (Repository/Service/Router pattern). Use for API, endpoint, REST, database, server, migration, and auth work.

Architecture specialist for software/system design, module and service boundaries, tradeoff analysis, and stakeholder synthesis. Uses context-aware methods such as diagnostic routing, design-twice comparison, ATAM-style risk analysis, CBAM-style prioritization, and ADR-style decision records.

Academic writing specialist for publication-grade English prose. Drafts, revises, and audits essays, reports, analysis sections, executive summaries, conclusions, and literature reviews while enforcing sentence-structure variation, high-frequency academic verbs, calibrated hedging, and anti-AI stylistic compliance. USE for academic writing, essay polish, paragraph rewrite, prose revision against any rubric tier (HD/D/C, A/B/C, top-band/mid-band, etc.), anti-AI audit, reverse outlining, claim-evidence mapping, and rubric enforcement on assignments.

Reviews a NuGet/NuGet.Client pull request like a senior maintainer — reviews in an isolated workspace by default, or against the reviewer's existing clone (self-review / local changes), builds and tests the affected projects, traces changes across files, and returns high-signal, severity-tagged findings with a merge verdict. Invoke explicitly with a PR number or branch.

Enable C# nullable reference types on files that still have `#nullable disable` in the NuGet.Client codebase. Use this skill whenever the user asks to enable nullable, migrate nullable, remove `#nullable disable`, annotate nullability, or fix nullable warnings for any NuGet project or file. Also trigger when the user mentions a GitHub issue about nullable enablement, references PublicAPI.Shipped.txt annotation updates, or says things like "let's do nullable on X" or "enable nullable for these files."

Assists with reproducing and triaging NuGet restore issues. Given a GitHub issue from NuGet/Home, analyzes the issue, extracts repro-relevant data, and writes C# tests in the NuGet.Client repo that reproduce the described scenario. Use for NuGet restore bugs, error code investigations, and test authoring tasks.

Create or update a pull request using the NuGet.Client PR template. Use when asked to: create PR, open PR, push and create PR, submit PR, open pull request, send changes for review, update PR description, fix PR body, edit PR description, update the PR.

Cherry-pick (backport/forward-port) one or more commits from one branch onto another, creating a fresh branch and opening a pull request that follows the repository's conventions. Use this whenever the user wants to move, port, backport, or cherry-pick a commit or a merged PR to a release/servicing branch (e.g. "cherry-pick the latest dev commit to 7.9.x", "backport #7576 to release/8.0.x", "port that fix to the release branch"), even if they don't say the exact word "cherry-pick". If the cherry-pick hits conflicts, STOP and report back instead of trying to resolve them, unless the user explicitly asked you to resolve conflicts.

Drive the .NET SDK breaking-change documentation-and-notification process for a NuGet change that has already been implemented. Invoke this once a NuGet/Home issue (or its implementing NuGet.Client PR) is labeled `Breaking-Change`. It makes sure the correct documentation issues are filed/completed (the NuGet NUxxxx reference-docs issue and the official dotnet/docs breaking-change issue) and helps author the draft notification email to the .NET Breaking Change Notifications alias. Trigger on phrases like "breaking change process", "file the breaking change doc issue", "the issue got the Breaking-Change label", "draft the breaking change email", or "notify dotnetbcn".

Fix F# debugging issues (breakpoints, .pdb, sequence points). Build, run VS integration tests, inspect IL/PDB.

Performs multi-agent, multi-model code review of F# compiler PRs across 19 dimensions including type checking, IL emission, binary compatibility, and IDE performance. Dispatches parallel assessment agents per dimension, consolidates with cross-model agreement scoring, and filters false positives. Invoke when reviewing compiler changes, requesting expert feedback, or performing pre-merge quality checks.