How sessions get classified

A session is a stream of requests from the same IP+UA, split when idle for more than 30 minutes. Each session lands in one of the classes below by the rules on this page: any hard rule makes it a known bot; otherwise the soft rules add up to a score that two thresholds split.

Classes

bot_known
bot_likely
unknown
human_likely

User-Agent families

The first matching pattern wins. Empty UA → empty; no match → unknown. Bot-side families are flagged on the bot_ua hard rule.

Name	Pattern	Side
`ramore-monitor`	`ramore\-monitor`	bot
`gptbot`	`GPTBot`	bot
`claudebot`	`ClaudeBot`	bot
`perplexitybot`	`PerplexityBot`	bot
`bytespider`	`Bytespider`	bot
`googlebot`	`Googlebot`	bot
`bingbot`	`Bingbot`	bot
`ahrefsbot`	`AhrefsBot`	bot
`semrushbot`	`SemrushBot`	bot
`mj12bot`	`MJ12bot`	bot
`duckduckbot`	`DuckDuckBot`	bot
`yandexbot`	`YandexBot`	bot
`facebookbot`	`facebookexternalhit`	bot
`whatsapp`	`whatsapp`	bot
`telegrambot`	`telegram`	bot
`python-script`	`python-(?:requests\|urllib)`	bot
`curl`	`\bcurl\b`	bot
`wget`	`\bwget\b`	bot
`go-script`	`Go-http-client`	bot
`java-script`	`okhttp\|Apache-HttpClient\|java/`	bot
`libwww`	`libwww`	bot
`other-bot`	`\bbot\b\|crawler\|spider\|slurp\|mediapartners`	bot
`edge`	`Edg/`	browser
`chrome-mobile`	`Chrome/.*Mobile`	browser
`chrome`	`Chrome/`	browser
`firefox`	`Firefox/`	browser
`safari`	`Safari/.*Version/`	browser
`safari-webkit`	`Safari/`	browser
`opera`	`Opera\|OPR/`	browser

Route categories

Search route: /v1/names/{etype} (must carry a non-empty q=).

Bot-only routes: /robots.txt, /sitemap-{n}.xml, /sitemap.xml
SvelteKit data prefetch routes: /__data.json, /about/__data.json, /{game}/__data.json, /{rootType}/table/__data.json, /{rootType}/{...semanticId}/__data.json
API routes: /v1/names/{etype}, /v1/specs, /v1/trees/{root_type}/{semantic_id}, /v1/works-intersect/{...spec}

Hard rules

Any of these → bot_known. Rates over 5,265 sessions.

empty_ua — User-Agent header missing or empty. 2.53%
bot_ua — User-Agent matches a known bot/crawler/script family. 14.70%
robots_or_sitemap — Hit a bot-only route: /robots.txt, /sitemap*.xml. 7.26%
all_HEAD — Every request in the session uses the HEAD method. 0.02%

Soft rules

Applied only when no hard rule fired. Scores are summed; the session lands as human_likely at score ≥ 3, bot_likely at score ≤ 0, otherwise unknown.

Score	Name	When it fires	Observed
+2	`search_used`	Used the search route with a non-empty query parameter.	31.49%
+1	`browser_ua`	User-Agent looks like a real browser (`Mozilla` + Chrome/Safari/Firefox/etc.).	79.43%
+2	`sveltekit_prefetch`	Session contains SvelteKit __data.json requests, indicating browser hover-prefetch activity.	58.80%
+1	`referrer_present`	At least one request carries a non-empty Referer.	79.43%
-2	`www_no_api`	The session made no request to an API route.	18.18%

Soft score distribution

Sessions that reached soft scoring (no hard rule fired). Dotted lines mark the human_likely / bot_likely thresholds.