Database

Core patterns for building AI agent systems: the observe-think-act loop, ReAct pattern implementation, tool-use cycles, memory systems (short-term and long-term), and planning strategies. Covers how to structure an agent's main loop, manage state between iterations, and wire together perception, reasoning, and action into a reliable autonomous system.

Handling failures in AI agent systems: retry strategies with backoff, fallback tools, graceful degradation, human-in-the-loop escalation, stuck-loop detection, and context recovery after crashes. Covers practical patterns for making agents robust against tool failures, API errors, and reasoning dead-ends.

Testing and evaluating AI agents: trajectory evaluation, task completion metrics, tool-use accuracy measurement, regression testing, benchmark suites, and A/B testing agent configurations. Covers practical approaches to measuring whether agents are working correctly and improving over time.

Comparison of major AI agent frameworks: LangGraph, CrewAI, AutoGen, Semantic Kernel, and Claude Agent SDK. Covers when to use each framework, their trade-offs, core patterns, practical setup examples, and migration strategies between frameworks.

Safety and control systems for AI agents: input and output validation, action authorization, rate limiting, cost controls, content filtering, scope restriction, and audit logging. Covers practical implementations for keeping agents within bounds while maintaining their usefulness.

Memory systems for AI agents: conversation history management, summarization strategies, vector-based long-term memory, entity memory, episodic memory, and memory retrieval patterns. Covers practical implementations for giving agents persistent, searchable memory across sessions and within long-running tasks.

Planning strategies for AI agents: chain-of-thought prompting, tree-of-thought exploration, plan-and-execute patterns, iterative refinement, task decomposition, and goal tracking. Covers practical implementations that make agents more reliable at complex, multi-step tasks by thinking before acting.

Building agents specifically with the Claude API: extended thinking for complex reasoning, tool use patterns, computer use for browser/desktop automation, multi-turn conversation management, crafting system prompts for agents, and streaming agent responses. Covers Claude-specific features and best practices for building reliable autonomous agents.

Orchestrating multiple AI agents working together: supervisor patterns, swarm architecture, handoff protocols, agent-to-agent communication, and agent specialization. Covers practical patterns for splitting complex tasks across coordinated agents, managing shared state, and routing work to the right specialist agent.

Implementing tool and function calling across Claude, OpenAI, and Gemini APIs. Covers schema design best practices, parallel tool calls, error handling, tool result formatting, dynamic tool registration, and patterns for building composable tool sets that agents can use reliably.

Comprehensive guide to database deployment for web applications, covering managed database services (PlanetScale, Neon, Supabase, Turso), migration strategies, connection pooling, backup and restore procedures, data seeding, and schema management best practices for production environments.

Comprehensive guide to using Docker for production deployments, covering multi-stage builds, .dockerignore optimization, layer caching strategies, health checks, Docker Compose for local development, container registries, and security scanning best practices.

Complete guide to deploying applications on Fly.io, covering flyctl CLI usage, Dockerfile-based deployments, fly.toml configuration, persistent volumes, horizontal and vertical scaling, multi-region deployments, managed Postgres and Redis, private networking, and auto-scaling strategies.

Comprehensive guide to implementing continuous deployment with GitHub Actions, covering deploy workflows, environment protection rules, secrets management, matrix builds, dependency caching, artifact management, and deploying to multiple targets including Vercel, Fly.io, AWS, and container registries.

Comprehensive guide to post-deployment monitoring for web applications, covering uptime checks, error tracking with Sentry, application performance monitoring, log aggregation, alerting strategies, public status pages, and incident response procedures for production systems.

Complete guide to deploying web applications on Netlify, covering build settings, deploy previews, serverless and edge functions, forms, identity, redirects and rewrites, split testing, and environment variable management for production workflows.

Complete guide to deploying applications on Railway, covering project setup, environment variable management, services and databases (Postgres, Redis, MySQL), persistent volumes, monorepo support, private networking between services, and scheduled cron jobs.

Comprehensive guide to deploying static sites and single-page applications, covering GitHub Pages, Cloudflare Pages, AWS S3 with CloudFront, cache busting strategies, prerendering for SEO, SPA routing configuration, and CDN setup for optimal performance.

Comprehensive guide to deploying modern web applications on Vercel, covering framework-specific configuration for Next.js, SvelteKit, Astro, and Remix, along with environment variables, preview deployments, edge and serverless functions, ISR, custom domains, and monorepo support.

Comprehensive guide to zero-downtime deployment patterns including blue-green deployments, canary releases, rolling updates, database migrations during deployments, health check strategies, rollback mechanisms, and feature flag integration for safe progressive rollouts.

Covers testing AI agent behavior end-to-end: trajectory evaluation, tool-call sequence validation, multi-step correctness verification, stuck-loop detection, cost regression testing, and timeout handling. Triggers: "test my AI agent", "agent trajectory evaluation", "tool call testing", "multi-step agent testing", "agent stuck detection", "agent cost regression", "validate agent behavior".

Covers implementing CI/CD pipelines for AI applications: running LLM evals in GitHub Actions, gating deployments on eval scores, monitoring prompt and model drift, versioning prompts alongside code, cost tracking, and canary deployments for AI features. Triggers: "CI for AI", "run evals in GitHub Actions", "gate deployment on eval score", "prompt drift detection", "version prompts in CI", "AI deployment pipeline", "LLM CI/CD".

Covers popular LLM evaluation frameworks and how to use them: Braintrust, Promptfoo, RAGAS, DeepEval, LangSmith, and custom eval harnesses. Includes setup, configuration, writing eval cases, CI integration, and choosing the right framework for your use case. Triggers: "eval framework", "Braintrust setup", "Promptfoo config", "RAGAS evaluation", "DeepEval", "LangSmith evals", "custom eval harness", "which eval tool should I use".

Covers using LLMs to evaluate other LLM outputs: rubric design, pairwise comparison, reference-based and reference-free grading, calibration techniques, inter-rater reliability measurement, and cost-efficient judging strategies. Triggers: "LLM as judge", "use GPT to evaluate outputs", "AI grading AI", "rubric for LLM evaluation", "pairwise comparison", "LLM evaluator", "auto-grade LLM responses".

Covers the foundations of evaluating LLM-powered applications: why evaluation matters, the taxonomy of metric types (exact match, semantic similarity, LLM-as-judge), building and curating eval datasets, establishing baselines, detecting regressions, and designing eval pipelines that scale from prototyping through production. Triggers: "evaluate my LLM app", "set up evals", "how do I measure LLM quality", "create an eval pipeline", "LLM metrics", "eval dataset".

Covers testing and hardening prompts for LLM applications: prompt regression testing, A/B testing prompt variants, temperature sensitivity analysis, edge case libraries, prompt versioning strategies, and golden test sets. Triggers: "test my prompt", "prompt regression", "A/B test prompts", "prompt versioning", "temperature sensitivity", "golden test set for prompts", "prompt quality assurance".

Covers red-teaming AI applications for safety and robustness: adversarial prompt testing, jailbreak resistance evaluation, PII leakage detection, hallucination measurement, bias detection, safety benchmarks, and building automated red-team pipelines. Triggers: "red team my AI", "adversarial testing for LLMs", "jailbreak testing", "PII leakage test", "hallucination detection", "AI bias testing", "safety benchmark", "AI security testing".

Covers testing and validating structured outputs from LLMs: JSON mode validation, schema conformance with Zod and JSON Schema, handling partial and malformed outputs, retry strategies with exponential backoff, and building type-safe LLM response pipelines. Triggers: "validate LLM JSON output", "test structured output", "JSON schema validation for AI", "type-safe LLM responses", "handle malformed LLM output", "Zod validation for AI".

Teaches effective AI pair programming techniques for tools like Claude Code, Cursor, and Copilot. Covers when to lead versus follow the AI, providing persistent context through CLAUDE.md and .cursorrules files, breaking complex tasks into AI-manageable pieces, using git strategically with frequent commits as checkpoints, and recognizing when the AI is stuck in a loop. Use when working alongside AI coding tools in a collaborative development workflow.

Teaches how to debug code generated by AI tools, covering the unique failure modes of AI-generated code including hallucinated APIs, version mismatches, circular logic, and phantom dependencies. Explains how to read error messages back to the AI effectively, provide minimal reproductions, diagnose when the AI is giving bad fixes, and use systematic debugging approaches on codebases you did not write by hand. Use when AI-generated code is not working and you need to find and fix the issue.

Covers the unique challenges of maintaining codebases built primarily through AI code generation. Addresses inconsistent patterns across AI-generated files, refactoring AI sprawl, establishing coding conventions after the code already exists, documentation strategies for AI-built projects, and managing the specific forms of technical debt that AI tools create. Use when a vibe-coded project needs ongoing maintenance or has grown unwieldy.

Guides the complete journey from an idea to a working application using AI code generation tools. Covers writing effective app specifications, choosing the right tool for the job (Claude Code, Cursor, Bolt, v0, Lovable, Replit Agent), the spec-first approach, iterating on generated code without losing coherence, and managing scope creep during AI-assisted development. Use when someone wants to build an app from scratch using vibe coding.

Teaches how to review, audit, and evaluate AI-generated code effectively. Covers common AI code smells like over-engineering, dead code, wrong abstractions, and hallucinated APIs. Includes security review checklists, dependency auditing, performance review techniques, and strategies for catching the subtle bugs that AI confidently introduces. Use when reviewing code produced by any AI coding tool.

Guides the transition from a vibe-coded prototype to a production-grade application. Covers identifying when the project has outgrown pure vibe coding, refactoring AI-generated code for production reliability, adding tests retroactively to an untested codebase, introducing CI/CD pipelines, establishing code ownership and review processes, and building the engineering practices needed to sustain a growing application. Use when a vibe-coded project is succeeding and needs to become a real product.

Covers architecture decisions optimized for AI-assisted development. Teaches how to choose frameworks and structures that AI tools work well with, why monolith-first is the right default for vibe coding, how to organize files so AI can navigate them, which abstraction patterns help versus hinder AI code generation, and how to keep complexity within the bounds of what AI can reason about. Use when making technology and architecture choices for a vibe-coded project.

Teaches the foundations of vibe coding — the 2025-2026 paradigm of building software primarily through AI prompting. Covers what vibe coding actually is, the core prompting loop, when it works well (prototyping, MVPs, CRUD apps, internal tools) versus when it fails (distributed systems, real-time, safety-critical), how to manage context windows effectively, and when to drop out of the AI loop and take manual control. Use when someone is new to vibe coding or wants to improve their fundamentals.

Cloudflare Durable Objects for stateful edge computing, covering constructor patterns, storage API, WebSocket support, alarm handlers, consistency guarantees, and use cases like rate limiting, collaboration, and game state.

Cloudflare Workers AI for running inference at the edge, covering supported models, text generation, embeddings, image generation, speech-to-text, AI bindings, and streaming responses.

Cloudflare D1 serverless SQLite database for Workers, covering schema management, migrations, queries, prepared statements, batch operations, local development, replication, backups, and performance optimization.

Cloudflare Workers runtime fundamentals including V8 isolates, wrangler CLI, project setup, local development, deployment, environment variables, secrets, and compatibility dates.

Cloudflare Workers KV namespace for globally distributed key-value storage, including read/write patterns, caching strategies, TTL, list operations, metadata, bulk operations, and the eventual consistency model.

Production patterns for Cloudflare Workers including queue consumers, cron triggers, email workers, browser rendering, Hyperdrive database connection pooling, Vectorize vector search, and the analytics engine.

Cloudflare R2 object storage with S3-compatible API, covering bucket operations, multipart uploads, presigned URLs, public buckets, lifecycle rules, event notifications, and cost optimization compared to S3.

Request routing in Cloudflare Workers including URL pattern matching, path parameters, middleware patterns, error handling, CORS configuration, custom domains, route priorities, and Workers for Platforms.

Teaches Conflict-free Replicated Data Types (CRDTs), the mathematical foundation for local-first sync. Covers how CRDTs guarantee eventual consistency without coordination, the difference between state-based and operation-based CRDTs, and practical implementations of G-Counter, PN-Counter, LWW-Register, OR-Set, G-Set, and RGA (Replicated Growable Array). Includes causal ordering, vector clocks, and guidance on choosing the right CRDT for your data model.

Teaches ElectricSQL, a Postgres-backed local-first sync framework. Covers the Electric architecture where Postgres is the source of truth and data syncs to local SQLite databases on client devices via shape-based partial replication. Includes shape definitions, live queries, offline-first patterns, conflict resolution with rich CRDTs, integration with React and Expo (React Native), deployment patterns, and migration strategies.

Teaches IndexedDB patterns for local-first web applications, using Dexie.js as the primary wrapper library. Covers schema design and versioning, creating indexes for efficient queries, transaction patterns, performance optimization (bulk operations, pagination, lazy loading), migration strategies for schema evolution, storage quota management, data export and import, and integration patterns with sync engines and reactive frameworks.

Teaches authentication and authorization patterns for local-first applications that must work offline. Covers offline-capable auth with cached tokens, permission sync and local enforcement, encrypted local storage for sensitive data, key management with device-bound keys, device authorization and revocation, multi-device identity linking, end-to-end encryption for synced data, and secure patterns for handling auth in disconnected environments.

Teaches the local-first software paradigm where applications store data on the user's device, work fully offline, and sync to peers or servers when connectivity is available. Covers the spectrum from cloud-first to offline-first to local-first, core benefits (instant UX, offline capability, data ownership, privacy), key challenges (conflict resolution, sync complexity, storage limits), architectural patterns, and decision frameworks for when local-first is the right choice.

Teaches how to design and build a sync engine for local-first applications. Covers the operation log as the foundation, conflict resolution strategies (last-write-wins, operational transform, CRDTs), server reconciliation patterns, partial sync for large datasets, bandwidth optimization techniques, version vectors and causal consistency, clock synchronization, and practical implementation patterns with code examples.

Teaches building local-first collaborative applications with Yjs, the most widely adopted CRDT library for JavaScript. Covers the Y.Doc document model, shared types (Y.Map, Y.Array, Y.Text, Y.XmlFragment), the awareness protocol for presence and cursors, persistence and sync providers (WebSocket, WebRTC, IndexedDB), integrating with editors like ProseMirror/TipTap/CodeMirror/Monaco, undo/redo management, and performance optimization patterns.

Teaches Zero (by Rocicorp), the successor to Replicache, a sync engine for building local-first web applications with instant UI, optimistic mutations, and server-side authority. Covers the Zero architecture (client cache, sync engine, server), defining queries and mutators, the reactivity model, server-side authorization and permissions, optimistic updates with automatic rollback, deployment patterns, and migration from Replicache.

Rust commands with the invoke pattern, argument passing, return types, async commands, error handling, state management, and type safety between Rust and TypeScript in Tauri 2.0.

Distributing Tauri applications including installers for MSI, DMG, AppImage, and deb, auto-update with the built-in updater, code signing for Windows and macOS, CI/CD builds, and cross-compilation.

Frontend integration with Tauri 2.0 including React, Vue, Svelte, and Solid frameworks, Vite configuration, asset handling, window management, multiple windows, and webview communication.

Tauri 2.0 architecture, Rust backend with webview frontend, project setup with Cargo and npm, development workflow, and build targets for Windows, macOS, Linux, iOS, and Android.

Tauri 2.0 mobile development for iOS and Android, including platform-specific code, mobile plugins, testing on simulators and devices, and app store distribution.

Common Tauri 2.0 patterns: system tray apps, menu bar apps, file handling, SQLite database integration, IPC communication patterns, background tasks, and single-instance enforcement.

Tauri 2.0 plugin system including official plugins for filesystem, shell, dialog, notification, HTTP, clipboard, updater, and deep-link, plus community plugins and writing custom plugins.

Tauri 2.0 security model including capability-based permissions, allowlist configuration, Content Security Policy, IPC safety, sandboxing, code signing, auto-update security, and supply chain considerations.