Georgi Kalchev - DEV Community

Georgi Kalchev

Nov 4

A/B test readouts: when the conclusion does not hold

#statistics #testing

1 min read

Georgi Kalchev

Nov 3

The A2A Agent Card: what it must contain

#json #debugging #testing

1 min read

Georgi Kalchev

Nov 3

Retry policy mistakes that turn a blip into an outage

#debugging #testing

1 min read

Georgi Kalchev

Nov 2

PostgreSQL migrations that lock a busy table

#debugging #testing

1 min read

Georgi Kalchev

Nov 2

OAuth redirect flow mistakes that leak logins

#debugging #testing

1 min read

Georgi Kalchev

Nov 1

Kubernetes manifest settings that affect safety

#debugging #testing

1 min read

Georgi Kalchev

Nov 1

What verifying a JWT must include

#debugging #testing

1 min read

Georgi Kalchev

Oct 31

What makes a GitHub Actions workflow dangerous

#testing #debugging

1 min read

Georgi Kalchev

Oct 31

What a Dockerfile review should catch

#testing #debugging

1 min read

Georgi Kalchev

Oct 30

Common Content-Security-Policy mistakes

#debugging #testing

1 min read

Georgi Kalchev

Oct 30

CORS settings that let other sites read your API

#debugging #testing

1 min read

Georgi Kalchev

Oct 29

Cookie attributes that protect less than you think

#debugging #testing

1 min read

Georgi Kalchev

Oct 29

x402 Bazaar, x402scan, marketplaces: why get listed

#x402 #bazaar #mcp #seo

1 min read

Georgi Kalchev

Oct 28

Windows curl and PowerShell UTF-8: what models miss

#testing #modelcomparison #weakmodels #cyrillic

1 min read

Georgi Kalchev

Oct 28

MCP tool annotations: what language models miss

#mcp #testing #modelcomparison #weakmodels

1 min read

Georgi Kalchev

Oct 27

llms.txt and RSS feeds: what models get right

#seo #modelcomparison #weakmodels #testing

1 min read

Georgi Kalchev

Oct 27

Orphan pages and redirect chains: what models miss

#seo #modelcomparison #weakmodels #testing

1 min read

Georgi Kalchev

Oct 26

IndexNow, Bing and sitemaps: what models still miss

#seo #modelcomparison #weakmodels #testing

1 min read

Georgi Kalchev

Oct 26

JSON-LD and hreflang: what models add that Google refuses

#seo #hallucination #modelcomparison #weakmodels

1 min read

Georgi Kalchev

Oct 25

Do AI crawlers really get blocked? Reading the test

#aicrawlers #cloudflare #modelcomparison #weakmodels

1 min read

Georgi Kalchev

Oct 25

Google indexing fixes that models get wrong

#seo #modelcomparison #weakmodels #testing

1 min read

Georgi Kalchev

Oct 24

Google indexing on Workers: 500s only a burst showed

#seo #cloudflare #opennext #debugging

1 min read

Georgi Kalchev

Oct 24

What models still get wrong about social posting APIs

#testing #modelcomparison #hallucination

1 min read

Georgi Kalchev

Oct 23

What a model gets wrong writing a job post from notes

#testing #modelcomparison #hallucination

1 min read

Georgi Kalchev

Oct 23

What a model misses when it reviews an x402 listing

#x402 #bazaar #testing #modelcomparison

1 min read

Georgi Kalchev

Oct 22

A model flags a wrong total but skips the sum

#testing #modelcomparison #json

1 min read

Georgi Kalchev

Oct 22

A model that summarizes a table adds its own sums

#testing #modelcomparison #summarization #hallucination

1 min read

Georgi Kalchev

Oct 21

Cloudflare Web Analytics: link previews are not readers

#cloudflare #testing #modelcomparison #statistics

1 min read

Georgi Kalchev

Oct 21

Does cookieless analytics need consent in the EU?

#cloudflare #testing #modelcomparison

1 min read

Georgi Kalchev

Oct 21

Three weeks on, 80 of 82 x402 sites still block AI training crawlers

#ai #seo #webdev #cloudflare

1

1 min read

Georgi Kalchev

Oct 20

When to /clear or /compact a Claude Code session

#claudecode #testing #modelcomparison

1

1 min read

Georgi Kalchev

Oct 20

A month later, 98 of 104 AI-built sites look the same to a crawler

#seo #ai #webdev #javascript

1 min read

Georgi Kalchev

Oct 20

HTTP 402 and x402: three places a payment breaks

#x402 #bazaar #debugging #cloudflare

1 min read

Georgi Kalchev

Oct 20

Many AI-built sites have a finished link preview and an empty page

#seo #ai #webdev #javascript

1 min read

Georgi Kalchev

Oct 19

How the x402 protocol works, with one real payment

#x402 #debugging #json

1 min read

Georgi Kalchev

Oct 19

Half of x402 services have no front page an AI crawler can read

#ai #seo #webdev

1 min read

Georgi Kalchev

Oct 19

Why you should not install unvetted AI agent skills

#skillmd #claudecode #mcp #walletsafety

1 min read

Georgi Kalchev

Oct 19

OpenNext R2 cache: old builds pile up, 41 GB cleaned

#cloudflare #opennext #testing #modelcomparison

1 min read

Georgi Kalchev

Oct 19

Five reasons AI crawlers cannot read your site, and how to fix each

#seo #ai #webdev #tutorial

1 min read

Georgi Kalchev

Oct 18

Gemini fallback chains: when an empty 200 should move on

#testing #debugging #json #weakmodels

1 min read

Georgi Kalchev

Oct 18

One in eleven x402 sites blocks AI training crawlers

#ai #seo #webdev #cloudflare

1 min read

Georgi Kalchev

Oct 18

What Claude Code memory really loads at start

#claudecode #testing #debugging #bulgarian

1 min read

Georgi Kalchev

Oct 17

We fetched 104 AI-built sites the way GPTBot does. 61% were empty.

#seo #ai #javascript #webdev

1

1 min read

Georgi Kalchev

Oct 17

XML and config files: the AI never says stop

#testing #modelcomparison #weakmodels

1

1 min read

Georgi Kalchev

Oct 17

CSV to JSON with AI: where data quietly goes missing

#testing #modelcomparison #weakmodels

1 min read

Georgi Kalchev

Oct 16

Markdown table repair: the AI invents a column instead

#testing #modelcomparison #weakmodels

1 min read

Georgi Kalchev

Oct 16

Mojibake, CSV and JSONL repair: code against an AI model

#testing #modelcomparison #weakmodels

1 min read

Georgi Kalchev

Oct 15

AI pull request descriptions: claims the diff never made

#testing #modelcomparison #hallucination #weakmodels

1 min read

Georgi Kalchev

Oct 15

Cloudflare cron day numbers: what Claude gets wrong

#cloudflare #testing #modelcomparison #weakmodels

1 min read

Georgi Kalchev

Oct 14

Release notes from commits: AI lists what users never see

#testing #modelcomparison #hallucination #weakmodels

1 min read

Georgi Kalchev

Oct 14

Length limit or every fact: which one the AI breaks

#testing #modelcomparison #hallucination #weakmodels

1 min read

Georgi Kalchev

Oct 13

When an AI model doubts evidence that was sound

#testing #modelcomparison #weakmodels #cloudflare

1 min read

Georgi Kalchev

Oct 13

LLM config repair: the syntax holds, the values move

#testing #modelcomparison #weakmodels

1 min read

Georgi Kalchev

Oct 12

Maria, not Mariya: where models slip on Bulgarian Latin

#bulgarian #cyrillic #testing #modelcomparison

1 min read

Georgi Kalchev

Oct 12

Where the garbled letters in AI pictures come from

#testing #modelcomparison #weakmodels

1 min read

Georgi Kalchev

Oct 11

561 million rows read: can a model find why?

#testing #modelcomparison #weakmodels #sqlite

1 min read

Georgi Kalchev

Oct 11

Translating locale files with an LLM: what broke

#translation #testing #modelcomparison #weakmodels

1 min read

Georgi Kalchev

Oct 10

Which SQLite queries quietly read the whole table

#sqlite #cloudflare #debugging #testing

1 min read

Georgi Kalchev

Oct 10

What a small model adds to a meta description

#metadescriptions #seo #weakmodels #modelcomparison

1 min read

Georgi Kalchev

Oct 9

Extracting JSON with an LLM: nulls instead of guesses

#json #testing #modelcomparison #weakmodels

1 min read