Fix LLM context window overflow in long agent runs - token budgets, protected state and safe summarization

Design LLM provider fallback and routing - error classification, circuit breakers, equivalent models, request adapters and failover testing

Build a small LLM evaluation dataset - real cases, edge and refusal tests, code and model graders, holdout split and per-change score tracking

Cut LLM API cost with prompt caching - stable-prefix prompt layout, cache-hit measurement, context trimming, model routing and batch jobs

Add authentication to a remote MCP server - API keys vs OAuth 2.1, audience and scope checks, per-tool authorization, Origin checks and audit logs

Reduce LLM hallucinations - grounded prompts, abstention, quote-verified citations, tool-backed facts and independent verification passes

Debug Kubernetes ingress 404 and 503 errors - ingress class and rules, Service selectors and ports, empty endpoints, probes and backend protocol

Diagnose Kubernetes CrashLoopBackOff and OOMKilled pods - exit codes, previous logs, probes and limits

Troubleshoot Kafka consumer lag and rebalances - partition parallelism, max.poll.interval.ms, heartbeats, poison messages, offset commits and skew

Handle LLM API 429 and overloaded errors - request vs token limits, Retry-After, jittered backoff and concurrency caps

Read mypy errors - Optional None narrowing, return-value and arg-type mismatches, attr-defined, strict no-untyped-def, implicit Optional

Fix nginx 502 and 504 errors - error-log messages mapped to refused, timeout, socket and header causes

Diagnose slow MySQL queries - slow log, EXPLAIN types and Extra flags, composite index order, covering indexes and index-killing patterns

Fix slow MongoDB queries - explain executionStats, COLLSCAN vs IXSCAN, compound index order with the ESR rule, covered queries and skip pagination

NDJSON and JSON Lines in Python and jq - write, stream, skip corrupt lines, Extra data errors, NaN, ensure_ascii

Fix ERR_TOO_MANY_REDIRECTS loops - trace the chain with curl, X-Forwarded-Proto behind proxies, Cloudflare Flexible SSL and www/apex conflicts

Fix Node ESM and CommonJS errors - import outside module, require not defined, __dirname, ERR_REQUIRE_ESM, extensions, JSON imports, nodenext

Find what blocks the Node.js event loop - loop delay, CPU profile, sync JSON and regex, worker threads

Fix React and Next.js hydration mismatch errors - random values, dates and locale, window and localStorage use, bad HTML nesting and extensions

Node worker_threads for CPU work - blocked event loop gives 0 ticks, 4 parallel workers in 1.4x single time, worker error events, when not to use threads