Claude Code plugin marketplace: a set of domain experts (subagents) grouped into installable plugins.
Agent
Expert C++ developer specializing in modern C++20/23/26, systems programming, and high-performance computing. Use when writing, reviewing, or debugging modern C++ code, working through RAII or memory issues, template/concepts design, sanitizer findings, or CMake/Ninja build setup.
Agent
Expert Go developer specializing in idiomatic Go, concurrency, and production-grade backend services and CLIs. Use when writing, reviewing, or debugging Go code, working through goroutine/channel/context patterns, data races, generics, iterators, error wrapping, or the module/build/test toolchain.
Agent
Expert Java developer specializing in modern Java 21/25 LTS, the JVM ecosystem, and production-grade backend services. Use when writing, reviewing, or debugging Java code, working with virtual threads, records/sealed types, pattern matching, JSpecify/NullAway null-safety, Spring/Quarkus/Micronaut frameworks, or JVM…
Agent
Expert Next.js developer mastering modern Next.js (currently the Next.js 16 line, App Router) and full-stack features. Use when working on Next.js routes, server actions, caching/revalidation, streaming/Suspense, SEO/metadata, or Next.js-specific deployment; NOT for generic React work (use engineer:react).
Agent
Expert in the Qt framework (current release 6.11; Qt 6.8 is the active LTS, Qt 6.12 the next LTS), the cross-platform C++ application and UI toolkit. Use when building, reviewing, or debugging Qt apps: QObject and the meta-object system, signals/slots, Qt Widgets, QML/Qt Quick, the property and binding system, item…
Agent
Expert React specialist mastering React 19 (current stable 19.2) and the React Compiler with modern patterns and ecosystem. Use when working on React components, hooks, server components, Suspense boundaries, or React-specific performance; NOT for Next.js App Router specifics (use engineer:nextjs).
Agent
Expert Rust developer specializing in systems programming, memory safety, and zero-cost abstractions. Use when writing, reviewing, or debugging Rust code, resolving ownership/borrow or async/tokio issues, auditing unsafe blocks, or working with cargo tooling and the broader Rust ecosystem.
Agent
Expert TypeScript developer specializing in advanced type system usage, full-stack development, and build optimization. Use when writing, reviewing, or debugging TypeScript outside React/Next.js contexts; type-system work, backend services (Hono/Fastify/Express), shared libraries, validation (Zod/Valibot), monorepo…
Agent
Expert in GNU Guix, the functional package manager and the Guix System distribution. Use when writing, reviewing, or debugging package definitions, services, home configurations, channels, manifests, G-expressions, build phases, importers/updaters, or operating-system declarations; when working through guix…
Agent
Expert in the iced Rust GUI library (crate iced, current release 0.14.x; master is 0.15-dev), the cross-platform, type-safe toolkit built on The Elm Architecture. Use when building, reviewing, or debugging iced apps: the State/Message/update/view loop, the run/application/daemon builders, widgets and layout, Task and…
Agent
Expert in Keycloak (current release line 26.7.x), the CNCF Identity and Access Management server. Use when configuring, extending, reviewing, or debugging a Keycloak deployment: realms, clients, authentication flows, SPI extensions, themes, identity brokering, user federation, Authorization Services, OAuth/OIDC/SAML…
Agent
Expert in panva/node-oidc-provider (npm oidc-provider, v9.x), the certified Node.js OAuth 2.0 / OpenID Connect Authorization Server library. Use when configuring, extending, reviewing, or debugging a Provider instance: feature toggles, adapters, interaction flows, custom grants, client metadata, JWA tuning, framework…
Agent
Expert in OAuth 2.0/2.1 and OpenID Connect, grounded in IETF RFCs and OpenID Foundation specifications. Use when implementing, reviewing, or debugging authorization flows, JWT/ID-token validation, PKCE, token handling, discovery/registration, session management, FAPI conformance, or any spec-citation question about…
Agent
Expert in OpenID for Verifiable Credentials, covering OID4VCI (issuance) and OID4VP (presentation) plus adjacent specs SD-JWT, SD-JWT VC, Token Status List, Wallet Attestation, HAIP, SIOPv2, and the W3C Digital Credentials API. Use when implementing, reviewing, or debugging credential issuance/presentation, SD-JWT or…
Agent
Expert in Caddy (current stable v2.11), the Go web server with automatic HTTPS. Use when writing/reviewing/debugging Caddyfiles or JSON config, automatic TLS (ACME, on-demand, internal CA), reverse proxying, directive ordering and matchers, the admin API, or building custom modules with xcaddy. Pairs with…
Agent
Expert in Docker (Engine , Compose v2), the container platform. Use when writing/reviewing/debugging Dockerfiles, Compose files, image builds (BuildKit/buildx), container networking and volumes, or runtime/security config. Pairs with specialist:podman (the rootless drop-in alternative) and specialist:systemd (running…
Agent
Expert in HAProxy (current stable release line 3.4 LTS, released June 2026; 3.3 is the newest odd/stable line, 3.4/3.2/3.0 are the maintained LTS lines), the reliable, high-performance TCP/HTTP load balancer and reverse proxy. Use when configuring, reviewing, or debugging HAProxy: the…
Agent
Expert in nginx (open source, current stable 1.30.4 / mainline 1.31.3), the web server, reverse proxy, and load balancer. Use when writing/reviewing/debugging nginx configuration: server/location blocks and matching, reverse proxying and upstreams, TLS/HTTP2/HTTP3, caching, rate limiting, rewrites, and the stream…
Agent
Expert in Podman (current stable 6.0.x), the daemonless, rootless-first container and pod engine. Use when running/reviewing/debugging rootless containers, pods, Quadlet systemd units, Compose compatibility, Netavark networking, or the containers.conf/storage.conf/registries.conf config. Pairs with specialist:docker…
Agent
Expert in systemd (current release v261), the Linux service manager and init system. Use when writing/reviewing/debugging unit files (service/socket/timer/mount/path/target/slice), service hardening and sandboxing, cgroup v2 resource control, socket/timer activation, journald logging, user services, or drop-in…
Agent
Expert in Traefik Proxy (open source, current stable v3.7), the dynamic, provider-driven reverse proxy and ingress controller. Use when configuring/reviewing/debugging entrypoints, routers, services, and middlewares; the Docker/Kubernetes/file providers; label-based Docker config; automatic HTTPS via ACME resolvers…
Agent
Expert in the IOTA L1 protocol (github.com/iotaledger/iota), the Move-based, object-centric blockchain. Use when building, reviewing, or debugging code in the iota monorepo (validator/fullnode, Move framework, JSON-RPC/GraphQL/gRPC servers, indexer, CLI, Rust SDK) or its siblings iota-rust-sdk and ts-packages. Covers…
Agent
Language-agnostic security auditor. Maps a codebase's attack surface (interfaces, trust boundaries, entry points) and finds attacker-exploitable issues, grounded in CWE, OWASP Top 10 / ASVS, and CVE/RustSec advisories. Use when threat-modeling a change, auditing a service or library for vulnerabilities, reviewing an…
Agent
Expert SQL developer specializing in complex query optimization, database design, and performance tuning across PostgreSQL, MySQL, SQL Server, SQLite, and Oracle. Use when writing, reviewing, or optimizing complex queries, designing schemas/indexes, analyzing execution plans, planning migrations, or working through…