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Message-spam protection evaluates twelve independent signals: short bursts, consecutive duplicates, repeated content across interleaved messages, sustained message rate, link rate, uppercase proportion, repeated characters, repeated tokens, combining-mark distortion, and invite bursts, repeats, and destination rates. Link counting is separate from domain allow/deny rules. Each server can choose member-and-channel or member-and-server scope, configure an individual threshold and rolling window for every signal, and exempt selected channels, roles, or members. Invite protection additionally accepts an allow-list of approved invite destinations (the invite code after normalization). Modes are disabled, observe, review, and enforce. All of these choices are stored with a per-server policy revision; none is a product-wide moderation policy. Decisions include the matching signal, observed count, threshold, window, scope, mode, policy revision, and correlation ID. The handoff is durable and idempotent. Queue delivery failures remain visible in operator diagnostics and are retried without creating a second decision.

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Invite protection

Invite matching recognizes discord.gg/code, discord.com/invite/code, and the older discordapp.com/invite/code form. It normalizes Unicode compatibility characters and removes whitespace and zero-width formatting before matching, so formats such as discord . gg / code resolve to the same destination. Only normalized destination codes and counts are retained, never message content. An invite decision is routed through the existing security incident projection. An active message_spam security rule controls the configured response and its review/enforcement ownership; review-mode decisions create the normal durable review path. The outbox delivery is idempotent, so a worker retry resumes that same incident/review route rather than producing a second moderation response. Before enabling enforcement, use the detector preview and a disposable server to check approved destinations, scope, exemptions, and the selected response rule. Only a SHA-256 content fingerprint, link count, routing identifiers, and timestamp are retained for rolling-window evaluation. Raw message content is not stored by this detector. Automated repository checks do not replace disposable-server acceptance before enforcement is enabled.

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Uppercase proportion

Each server chooses the uppercase percentage and the minimum message length and number of cased letters required before this signal is considered. A match records the uppercase and cased-letter counts plus those three configured values, so a reviewer can see why it matched without retrieving message text. The same channel, role, and member exemptions apply before any signal is evaluated. The detector uses Unicode uppercase and lowercase letter categories. Scripts with no case distinction (for example Chinese, Japanese, Korean, Arabic, and emoji) do not contribute letters and cannot match this signal; short content cannot match it either. That is a language limitation, not a moderation judgment. In review mode, a match is routed as one durable reviewed decision and does not delete, warn, or timeout a member.

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Repetition and visually distorted text

The repetition and distortion signals use Unicode normalization to count adjacent repeated characters, adjacent repeated word-like tokens, and combining marks. Each server chooses a minimum length plus maximum repeat and combining-mark ratios. It can exempt code blocks and the detected ar, en, ja, ko, or zh script family where local language conventions make these signals unsuitable. The same channel, role, and member exemptions apply. Pup retains only ratios, a coarse language family, code-block presence, and a categorical normalized preview such as [visually-distorted text normalized]. It never retains the message text for this detector, and the preview deliberately does not repeat the triggering text or reveal configured limits. Detection is a review aid, not a claim that stylized or non-Latin writing is abusive.