Discord error 30001: Maximum number of guilds reached (100)

The account attempting to join a guild is already in 100 servers, which is the cap for a normal user account. For bot developers this code has two faces. If you are using OAuth2 guilds.join to add a user to your server, the user has hit their personal 100-server cap and cannot be added until they leave one. If the bot itself is being added, 100 is the threshold at which an unverified application can no longer be invited to new servers.

The second case is the one that catches people. Bot applications that have not been through Discord's verification process are limited to roughly 100 servers. Past that point, the invite flow fails for new servers. Verification is started from the Developer Portal and, once approved, also unlocks privileged intents for apps over the user threshold (see 4014).

Verification is the way past the cap for bots. It is started from the Developer Portal (your application's page prompts for it as you approach the limit), and it involves identity verification for the owner plus a questionnaire about what the bot does and what data it needs. Until it is approved, invites to a 101st server fail with this code, so growth simply stops; after approval, the guild cap lifts. Privileged intents run on a separate but related track: they can be toggled freely while the app is small, and require per-intent approval once the app passes the review threshold of more than 10,000 unique users, the failure mode for which is gateway close 4014 rather than this REST error. Plan both reviews together, because a bot that crosses 100 servers is usually approaching the intent threshold too.

{
  "message": "Maximum number of guilds reached (100)",
  "code": 30001
}

Track guild count on every GUILD_CREATE and alert yourself at 75 so verification paperwork (privacy policy, description of data use, identity check) is done before growth stalls. Keep a separate development application for testing so test servers never count against the production bot.

The unverified-app guild cap sits alongside the privileged-intent review threshold on the Discord limits page, and the "100-server wall" section of Discord bot not responding covers how to time the application.