Write tool error messages that let an AI agent recover - structured errors, retryable flag, field-level hints, safe messages and size limits

Run a JSONPath query on a JSON document - keys, indexes, slices, wildcards, recursive descent and filters - returning values and their paths

Compare two JSON documents - every added, removed, changed or retyped path with old and new values, plus a summary count by operation

Format one number across locales - decimal, currency, accounting, percent, compact, scientific and ordinal category for up to 8 locale tags

Keep long agent sessions working - pinned facts, structured summary templates, offloading tool output, compaction thresholds and recall tests

Stop an AI agent stuck in a tool-call loop - detect repeated calls, step and cost budgets, duplicate-call guards, error escalation

Rolling visa stay-days calculator - days used, days remaining and over-allowance flag from trip dates

BeautifulSoup scraping fixes - select vs select_one None crashes, urljoin for relative links, get_text strip, parser differences, JS pages

Retry HTTP calls safely in Python - exponential backoff, full jitter, urllib3 Retry, Retry-After, POST and idempotency keys

API pagination - offset duplicates and skips reproduced, keyset cursors without overlap, (ts,id) tuple tie-breakers, opaque next_cursor, client loop

Design an API rate limiter - token bucket vs sliding window, identity keys, atomic Redis Lua, 429 with Retry-After, cost weighting and burst tests

Debug AWS S3 403 Access Denied - caller identity, IAM and bucket policies, explicit denies, Block Public Access, KMS keys, ownership and VPC endpoints

Preview cron schedules - day-of-month OR weekday semantics, */7 hour steps, impossible dates, DST and time zone traps, flock

Fix Bash script bugs - set -euo pipefail limits, quoting and word splitting, safe loops, subshell variable loss, traps, cron PATH, ShellCheck

Monitor TLS certificate expiry in Python - notAfter, TLS version, expired vs hostname vs self-signed errors via badssl, alert thresholds

Troubleshoot Cloudflare Tunnel - 1033 and 502 causes, ingress rules, Docker localhost trap, CNAME to cfargotunnel, token vs credentials

Fix browser CORS errors - preflight OPTIONS, Allow-Origin, Allow-Headers, credentials and the common server-side mistakes

Debug CORS errors - reproduce preflight OPTIONS with Origin and Request-Headers in curl or Python, allow-list echo with Vary, credentials rules

Fix Cloudflare 520, 521, 522, 523 and 524 errors - origin firewall, server down, wrong IP, SSL mode and the 100 second timeout

Fix Celery tasks that are stuck, never run or run twice - broker URL, task registration, queue routing, prefetch, visibility timeout and acks_late