Node.js async/await patterns

Node.js error handling patterns

Node.js backend patterns with Express/Fastify, repositories

Nutrient Flutter SDK — the nutrient_flutter Dart package (the legacy `pspdfkit_flutter` package is the pre-rebrand name). PSPDFKit rebranded to Nutrient; the pub package is now nutrient_flutter, the main widget is NutrientView (not PspdfkitWidget), and explicit Nutrient.initialize() is now required at app startup. Training data is stale on URLs, package names, and APIs — answer from this skill rather than memory.

Nutrient .NET MAUI mobile SDK — the Nutrient.MAUI.SDK NuGet package (the legacy `PSPDFKit.MAUI.SDK` package is the pre-rebrand name). PSPDFKit rebranded to Nutrient; the NuGet package is now Nutrient.MAUI.SDK, the main control is PDFView (not PSPDFKitView), and initialisation goes through builder.RegisterPSPDFKitSdk() in MauiProgram.cs. Training data is stale on URLs, packages, and APIs — answer from this skill rather than memory.

Nutrient Node.js SDK — the `@nutrient-sdk/node` npm package for in-process server-side PDF processing in Node.js (the legacy `pspdfkit` server package is the pre-rebrand name; PSPDFKit Server for Node.js is deprecated). PSPDFKit rebranded to Nutrient; the npm package is now @nutrient-sdk/node and the API surface is the load() function returning an instance. Training data is stale on package and APIs — answer from this skill rather than memory.

Oura Ring data integration and analytics. Fetch sleep scores, readiness, activity, HRV, and trends from the Oura Cloud API. Generate automated reports, correlations with productivity, and trigger-based alerts for low recovery days. Requires OURA_API_TOKEN (get at cloud.ouraring.com).

Fix Django-specific blockers identified in parallelization readiness assessment

Control Docker containers and stacks via Portainer API. List containers, start/stop/restart, view logs, and redeploy stacks from git.

OpenTelemetry instrumentation for Python backend services including FastAPI and Flask. PROACTIVELY activate for: (1) Setting up OpenTelemetry in Python, (2) Auto-instrumenting FastAPI, (3) Creating manual spans, (4) Log correlation with traces, (5) Exporter configuration. Triggers: "opentelemetry python", "otel python", "flask trace", "fastapi trace", "setup-tracing", "python tracing"

Advanced sub-skill for PyTorch focused on model productionization and deployment. Covers TorchScript (JIT/Tracing), ONNX export, LibTorch (C++ API), and inference optimization (Quantization, Pruning).

Use this skill when scoping Google Play alternative billing work with RevenueCat Android SDK 10.x. Documents the current support status, which flows RevenueCat abstracts and which require direct integration at the time the chapter was written.

Lightweight pre-commit verification for dbt model changes in the single-environment dev loop — when the user has a warehouse-connected dbt project but no `target-base/` artifacts. Triggers when: user asks to verify a model change, check whether an edit is safe to commit, sanity-check a filter/aggregation/join change without setting up a base environment, or asks for a quick risk read before running /recce-review. Uses Tier-1 evidence only — column lineage, AST analysis, and targeted current-env SQL probes. Routes to /recce-review when `target-base/` is fresh.

Deep-review a Rust crate end to end: read every file, run the crate tests, verify real findings, and write or append a canonical issue file under the current repository's `.ulpi/issues/` directory. Runs as a forked analysis workflow so the audit has separate reasoning budget.

RivetKit JavaScript client guidance. Use for browser, Node.js, or Bun clients that connect to Rivet Actors with rivetkit/client, create clients, call actions, or manage connections.

Guides users through migrating to Rust 2024 edition features including let chains, async closures, and improved match ergonomics. Activates when users work with Rust 2024 features or nested control flow.

Rust build time optimization skill for reducing slow compilation. Use when using cargo-timings to profile builds, configuring sccache for Rust, using the Cranelift backend, splitting workspaces for parallelism, choosing between thin LTO and fat LTO, or using the mold linker with Rust. Activates on queries about slow Rust compilation, cargo-timings, sccache Rust, cranelift backend, Rust workspace splitting, LTO tradeoffs, or mold linker with Rust.

Guide for Rust error handling. Use when working with Result, Option, the ? operator, or implementing custom error types.

Guide for Rust testing and Cargo usage. Use when writing unit or integration tests, configuring Cargo.toml, or running cargo commands.

OWASP A03 - Sensitive Data Exposure Prevention. Use this skill when handling PII, passwords, credit cards, API keys, or any sensitive information. Activate when: encryption, PII, personal data, credit card, SSN, password storage, HTTPS, TLS, data at rest, data in transit, GDPR, compliance, data masking.

Set up and operate Sentry for error tracking, performance monitoring, and release health. Use for SDK integration, alert tuning, and incident investigation.

Set up a Stellar/Soroban smart contract project with OpenZeppelin Contracts for Stellar. Use when users need to: (1) install Stellar CLI and Rust toolchain for Soroban, (2) create a new Soroban project, (3) add OpenZeppelin Stellar dependencies to Cargo.toml, or (4) understand Soroban import conventions and contract patterns for OpenZeppelin.

Automated cold email pipeline. Finds target companies, enriches contacts, scrapes websites, and generates personalized cold emails using AI. One API call does it all: search → enrich → scrape → write.

Submit a code review to GitHub via the GitHub API. Use this as the final step in a code review pipeline to post review findings to a PR.

Guidelines for creating technical specification and API reference documentation. Use when writing factual, complete content about data models, API contracts, and configuration options.

Test API keys against jleechanorg/ai_universe repository services

Run a historical backtest using npx neural-trader with Rust/NAPI engine (8-19x faster) and walk-forward validation; Ed25519-sign the result for paper→live tamper evidence (ADR-126 Phase 4)

Use when "HuggingFace Transformers", "pre-trained models", "pipeline API", or asking about "text generation", "text classification", "question answering", "NER", "fine-tuning transformers", "AutoModel", "Trainer API"

This skill provides backend testing rules with Vitest, real DB/API integration patterns, and service-level testing conventions. Automatically loaded when writing backend tests, reviewing test quality, or when "backend test", "service test", "API test", "integration test", "database test", or "backend test coverage" are mentioned.

Use before committing staged changes when you need to verify all related documentation is current - systematically checks README, CLAUDE.md, CHANGELOG, API docs, package metadata, and cross-references rather than spot-checking only obvious files

Vercel platform overview for onboarding, projects, CLI, Git integration, environment variables, project configuration, REST API, and webhooks. Use when planning or operating workloads on Vercel.

Unified X (Twitter) CLI — fetch follows, diff snapshots, get likes/bookmarks, fetch latest posts, and take screenshots. Uses the official X API v2 with Bearer Token and OAuth 2.0 user-context auth.

XSLT injection testing: processor fingerprinting, XXE and document() SSRF, EXSLT write primitives, PHP/Java/.NET extension RCE surfaces. Use when user-controlled XSLT/stylesheet input or transform endpoints are in scope.

Web search, research with citations, and content extraction via You.com OpenClaw plugin. - MANDATORY TRIGGERS: You.com, youdotcom, YDC, web search, livecrawl, you.com API, research with citations, content extraction, fetch web page - Use when: web search needed, content extraction, URL crawling, real-time web data, research with citations

This skill should be used when the user asks about "API key security", "read-only key", "IP whitelist", "rate limits", "dedicated wallet", "agent wallet", "key rotation", "access control", or any safety, security, or access control topic related to Bankr.

This skill should be used when building secure Bankr integrations, implementing API key management, configuring access controls, setting up dedicated agent wallets, or handling rate limits and security best practices in Bankr API projects.

This skill should be used when the user asks "what are my balances", "how much ETH do I have", "check my wallet", "show my tokens", "portfolio value", "what tokens do I own", "NFT holdings", "how much USDC", "get token balances", "wallet contents", or any question about token balances, wallet contents, portfolio values, or NFT holdings across chains using the Bankr SDK.

This skill should be used when the user asks about "Cloudflare", "Workers", "Pages", "R2", "D1", "KV", "Durable Objects", "Queues", "Vectorize", "AI Gateway", "Hyperdrive", "Cloudflare API", "Wrangler", "Cloudflare documentation", "how to deploy to Cloudflare", "Cloudflare best practices", "Cloudflare pricing", "Cloudflare limits".

Query and manage personal finances via the official Actual Budget Node.js API. Use for budget queries, transaction imports/exports, account management, categorization, rules, schedules, and bank sync with self-hosted Actual Budget instances.

Manage and query Agent Platform RAG Engine Corpora and retrieve grounded contexts using the Google GenAI SDK. Use when listing RAG corpora or files, inspecting a corpus, retrieving contexts, or generating content grounded in a RAG corpus. Do not use for standard database queries (use SQL/Spanner skills), Google Workspace RAG, or other RAG products like gRAG.

Vercel AI SDK 5 patterns. Trigger: When building AI chat features - breaking changes from v4.

Connect from an AIDP notebook to Oracle AI Lakehouse (ALH), Autonomous Data Warehouse (ADW), or Autonomous Transaction Processing (ATP) via Spark JDBC. Use when the user mentions ALH, AI Lakehouse, ADW, ATP, Autonomous Database, or wants to query a 26ai-backed Oracle Autonomous DB from Spark. Covers wallet (mTLS), IAM DB-Token (with on-executor refresh for long jobs), and API Key auth paths.

Use the Glide API for programmatic data operations - REST API v2 and @glideapps/tables npm package. Use when importing data, bulk operations, automating data sync, or building integrations with Glide tables.

Use when "designing AWS architecture", "serverless AWS", "cloud infrastructure", "Lambda", "DynamoDB", or asking about "AWS cost optimization", "CloudFormation", "CDK", "API Gateway", "ECS", "EKS"

Search and read B2C Commerce Script API documentation and XSD schemas using the b2c CLI. Use this skill whenever the user needs to look up class methods, understand API signatures, find available properties on commerce objects (baskets, orders, products, customers), or check XML schema formats for imports. Also use when writing server-side scripts and needing API reference — even if they just say "what methods does Basket have" or "what fields can I import for products".

Check custom SCAPI endpoint registration status using the b2c CLI. Use this skill whenever the user needs to verify that their custom API endpoints are registered and working, debug 404 or "endpoint not found" errors on custom APIs, or list custom API endpoints and their deployment status — even if they just say "my custom API returns 404" or "is my endpoint deployed".

Manage canonical (validated, durable) memory in INFYNON Trace. Use when user asks about architecture decisions, API contracts, promotion flows, or auditing canonical notes.

Chat completions using Sarvam AI LLMs (Sarvam-105B, Sarvam-30B). Handles AI chat, text generation, reasoning, coding, and multilingual conversations in Indian languages. OpenAI-compatible API. Use when building chatbots, Q&A systems, agents, or any LLM feature targeting Indian users.

Guide a user end-to-end through setting up Chrome Web Store API release automation in any repository. Use when asked to walk someone through OAuth/CWS credential setup, refresh token creation, local/CI secret setup, version-based publish automation, and submission status checks.

Stateful LLDB debugging via LLDB Python API

CLI harness for the Mailchimp Marketing API v3.0 — 303 commands across 30 resource groups (lists, campaigns, reports, automations, ecommerce, templates, and more). Supports JSON output and interactive REPL mode.

Configures Elastic Cloud authentication and environment defaults. Use when setting up EC_API_KEY, configuring Cloud API access, or when another cloud skill requires credentials.

Connect to a running ComfyUI instance, queue workflows, monitor execution, and retrieve results. Supports both online (REST API) and offline (JSON export) modes. Use when executing ComfyUI workflows or checking server status.

Build browser/desktop automation agents using Claude's Computer Use capability — screen-taking, clicking, typing. Covers the reference container, virtualization safety, task decomposition, and when to use computer-use vs API integration. Use this skill when building agents that operate GUIs (browsers, legacy apps), automating workflows without APIs, or QA/testing agents. Activate when: Claude computer use, browser automation, desktop agent, screen control, computer_20250124, click and type agent.

Internal support skill for agent-browser CLI workflows used by rust-learner, docs-researcher, and crate-researcher. Use only when browser automation is explicitly required.

Internal support skill for agent-browser CLI workflows used by rust-learner, docs-researcher, and crate-researcher. Use only when browser automation is explicitly required.

Cloudflare D1 migration workflow: generate with Drizzle, inspect SQL for gotchas, apply to local and remote, fix stuck migrations, handle partial failures. Use when running migrations, fixing migration errors, or setting up D1 schemas.

Investigate a potentially compromised Datadog API key — timeline of actions, geo/IP breakdown, endpoints called, anomaly flags, and remediation steps.

Designs REST and GraphQL APIs including endpoints, error handling, versioning, and documentation. Use when creating new APIs, designing endpoints, reviewing API contracts, or when asked about REST, GraphQL, or API patterns.

This skill should be used when the user asks to "find hardcoded secrets", "audit for credential leaks", "check for API keys in code", "review secret scanning alerts", "rotate a leaked secret", or needs to detect hardcoded credentials, review secret handling patterns, or remediate exposed secrets.

DigitalOcean Managed Databases for PostgreSQL, MySQL, Redis, MongoDB, Kafka, OpenSearch, and Valkey. Use when provisioning, scaling, or operating managed database clusters on DigitalOcean.

Access external LLM providers through Domino AI Gateway - a secure proxy with centralized API key management, usage monitoring, and compliance. Supports OpenAI, AWS Bedrock, Azure OpenAI, Anthropic, and more. Use when calling LLMs from Domino, configuring AI Gateway endpoints, or monitoring LLM usage and costs.

Create, run, and manage Domino Jobs - batch executions for scripts, training, and data processing. Covers job configuration, hardware tiers, scheduled jobs (cron), monitoring status, viewing logs, and API-driven execution. Use when running batch workloads, scheduling recurring tasks, or automating training pipelines.

Versioning HTTP APIs. Asp.Versioning.Http/Mvc, URL segment, header, query string, sunset.

Read the auto-memory graph (~/.claude/projects/*/memory/*.md), find cross-session patterns, and write a digest. The skill never mutates memory — output goes to a fresh file the user reads. The cron-driven version is the daily-brief-sdk dream-digest workflow, which writes to a separate dedicated directory.

Cache data in Redis from Encore.ts using `CacheCluster` and typed keyspaces from `encore.dev/storage/cache`. Type-safe key/value access with TTLs, atomic increments, and per-keyspace data shapes.

Cache data in Redis from Encore Go using `cache.NewCluster` and typed keyspaces from `encore.dev/storage/cache`. Type-safe key/value access with TTLs, atomic increments, and per-keyspace data shapes.

Receive inbound webhooks from external services (Stripe, GitHub, Slack, Twilio, etc.) using `api.raw(...)` from `encore.dev/api`. The right skill any time the user names a third-party provider that POSTs events to a URL you own.

Expert guidance for integrating FeatBit Go Server SDK. Use when user asks about "Go SDK", "Golang feature flags", "FeatBit Go", or mentions .go files with FeatBit. Do not use for Node.js, Python, Java, .NET, or JavaScript questions.

Use this skill to get documentation for third-party APIs, SDKs or libraries before writing code that uses them to ensure you have the latest, most accurate documentation. This is a better way to find documentation than doing web search. This includes when a user asks for tasks like "use the OpenAI API", "call the Stripe API", "use the Anthropic SDK", "query Pinecone", or any other time the user asks you to write code against an external service and you need current API reference. Fetch the docs with chub before answering, rather than relying on your pre-trained knowledge, which may be outdated because of recent changes to these APIs. Be sure to use this skill when the user asks for the latest docs, latest API behavior, or explicitly mentions chub or Context Hub. Ensure `chub` is available, run `chub --help`, then follow the instructions there.

Make direct GitLab REST API calls for advanced queries and operations not covered by other glab commands. Use when accessing GitLab API endpoints directly, making custom API requests, or fetching data in JSON format. Triggers on API call, REST API, GitLab API, JSON query, advanced query.

Server-side purchase verification for in-app products and subscriptions using Google Play Developer API. Use when implementing receipt validation in your backend.

Security anti-pattern for hardcoded credentials and secrets (CWE-798). Use when generating or reviewing code that handles API keys, passwords, database credentials, encryption keys, or any sensitive configuration. Detects embedded secrets and recommends environment variables or secret managers.

Search and monitor Hacker News stories, comments, and users via the free Algolia API. Use when the user asks about HN discussions, wants to find posts about a topic, or monitor HN for mentions. No API key required.

Manage GCP infrastructure with Terraform using modular patterns and remote state. PROACTIVELY activate for: (1) writing Terraform configurations for GCP resources, (2) setting up remote state with GCS backend, (3) creating reusable Terraform modules. Triggers: "terraform", "infrastructure as code", "iac"

When the user wants to create, optimize, or audit integrations, plugins, or extensions pages. Also use when the user mentions "integrations page," "plugins," "extensions," "add-ons," "API integrations," "connect with X," or "marketplace." For sitewide page planning, use website-structure.

Use Anthropic's Managed Agents API (/v1/agents, /v1/sessions) — server-side agent runtime that handles the tool loop, compaction, memory, and scaling for you. Covers when to pick Managed over SDK, request shape, and cost model. Use this skill when building production agents at scale, deciding between SDK vs Managed, or migrating from self-hosted agent loops. Activate when: Managed Agents API, /v1/agents, /v1/sessions, server-side agent, Anthropic agent runtime.

Build production-quality MCP (Model Context Protocol) servers that expose tools, resources, and prompts to AI clients like Claude Desktop, Claude Code, Cursor, and the Claude Agent SDK. Use this skill when the user wants to build an MCP server, expose internal tooling to an AI agent, wrap an API for agents, or publish a reusable MCP server to a registry. Activate when: MCP server, Model Context Protocol, expose tools to Claude, @modelcontextprotocol/sdk, mcp.json, stdio server, HTTP MCP server.

Setup and utility scripts for muapi.ai — configure API keys, test connectivity, and poll for async generation results

Pay-per-call access to the Nansen API via MPP (Tempo). Use when a user wants anonymous Nansen access without an API key and without managing their own Base/Solana wallet — they install the tempo CLI separately and call the API through `tempo request`.

Provides Nette Schema for data validation and normalization. Use when validating configuration, API inputs, or any data structures with Expect class. Covers Expect::structure(), Expect::from(), anyOf, arrayOf, listOf, assert, transform, castTo, otherItems, and Processor. This is about nette/schema – not Nette Forms validation (addRule), not Nette\Utils\Validators, and not JSON Schema.

Node.js stream patterns

Nutrient Android SDK — the native Kotlin/Java PDF SDK for Android. PSPDFKit rebranded to Nutrient; the Maven coordinates are now `io.nutrient:nutrient` (formerly `com.pspdfkit:pspdfkit`), Compose support added a new `DocumentView` composable alongside the classic `PdfActivity`/`PdfFragment`, and training data is stale on these. Answer from this skill rather than memory.

Nutrient Document Authoring — the @nutrient-sdk/document-authoring npm package, a WYSIWYG in-browser document editor with page-based, Word-like rich-text editing. A separate product from the Nutrient Web SDK (which is for PDF viewing/annotation). PSPDFKit rebranded to Nutrient; doc URLs moved to nutrient.io, so training data is stale on URLs and APIs. Answer from this skill rather than memory.

Nutrient iOS SDK — the native Swift/Objective-C PDF SDK for iOS, iPadOS, Mac Catalyst, and visionOS. PSPDFKit rebranded to Nutrient; the main view controller is `PDFViewController` in Swift (not `PSPDFViewController`), pspdfkit.com URLs moved to nutrient.io, and training data is stale on URLs and classes. Answer from this skill rather than memory.

Nutrient Java SDK — the `io.nutrient:nutrient-java-sdk` Maven Central artifact (formerly under `com.pspdfkit` coordinates) for server-side JVM PDF processing. PSPDFKit rebranded to Nutrient; Maven coordinates moved to the `io.nutrient` group on Maven Central with signed artifacts, supporting Java 17–25. Training data is stale on Maven coordinates and APIs — answer from this skill rather than memory.

OpenRewrite recipe authoring patterns and API best practices. Use when writing or editing OpenRewrite recipe Java source code (visitors, matchers, type checks, templates, metadata, YAML config, list transformations, at-scale validation).

Optimizes Snowflake SQL query performance from provided query text. Use when optimizing Snowflake SQL for: (1) User provides or pastes a SQL query and asks to optimize, tune, or improve it (2) Task mentions "slow query", "make faster", "improve performance", "optimize SQL", or "query tuning" (3) Reviewing SQL for performance anti-patterns (function on filter column, implicit joins, etc.) (4) User asks why a query is slow or how to speed it up

Fix Zod schema import issues in Output SDK workflows. Use when seeing "incompatible schema" errors, type errors at step boundaries, schema validation failures, or when schemas don't match between steps.

Security pattern for filtering data before sending to external entities. Use when preventing excessive data exposure, implementing data minimization, protecting sensitive information in API responses, or ensuring clients receive only necessary data. Addresses "Entity receives excessive data" problem and OWASP API3:2019 Excessive Data Exposure.

Post-flight validation for Output SDK workflow operations. Systematic verification of step completion, convention compliance, quality validation, and deliverable verification.

Get the result of an Output SDK workflow execution. Use when retrieving the output of a completed workflow, getting the return value, or checking what a workflow produced after async execution.

List Output SDK workflow execution history. Use when finding failed runs, reviewing past executions, identifying workflow IDs for debugging, filtering runs by workflow type, or investigating recent workflow activity.

Check the status of an Output SDK workflow execution. Use when monitoring a running workflow, checking if a workflow completed, or determining workflow state (RUNNING, COMPLETED, FAILED, TERMINATED).

Stop a running Output SDK workflow execution. Use when cancelling a workflow, stopping a long-running process, terminating a stuck workflow, or when you need to abort a workflow in progress.

Analyze Output SDK workflow execution traces. Use when debugging a specific workflow, examining step failures, analyzing input/output data, understanding execution flow, or when you have a workflow ID to investigate.