Anti Spam is a behavior-pack addon that monitors player chat and automatically detects:

• Rapid messaging (too many messages in a short time)
• Repeated identical messages
• Repeated characters (e.g. aaaaaaa, !!!!!!!)
• Blocked words (NG words)

When a violation is detected, the addon can mute or kick the player. Mute status and NG-word warning counts are saved to the world, so they persist across reconnects and world reloads.

All admin commands require Operator permission level 2 (same as /op). Cheats do not need to be enabled.

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Installation

1. Place the "Anti Spam" folder in your behavior packs directory:
.../development_behavior_packs/Anti Spam/

2. Open your world settings.

3. Go to Behavior Packs and activate "Anti Spam".

4. Re-enter the world (or restart it) so the scripts load.

Settings are stored inside the world using Dynamic Properties. They survive world saves and reloads.

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Language Settings

The addon supports Japanese, English, and both (bilingual).

Commands:
/spam:language ja → Japanese only
/spam:language en → English only
/spam:language both → Both languages (default)

Default: both Messages appear like: English text | 日本語テキスト

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What Gets Detected

1. Rapid messaging

If a player sends more messages than allowed within the configured time window, it counts as spam.

Default: More than 3 messages within 3 seconds triggers punishment.

2. Same message spam

If a player sends the same message repeatedly in a row, it counts as spam.

Default: 3 identical messages in a row triggers punishment.

3. Repeated characters

If a single character is repeated too many times in one message, it counts as spam.

Default: 8 or more consecutive identical characters (e.g. hellooooo, !!!!!!!!).

4. NG words (blocked words)

Messages containing blocked words are cancelled immediately.

Detection features:
• Case-insensitive matching (for English letters)
• Full-width / half-width normalization
• Katakana → Hiragana normalization (for Japanese)

Note: Matching is substring-based. A blocked word inside a longer word will also trigger a match.

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Punishments

Spam punishment

Controlled by: /spam:punishment

Type "mute":
Player cannot chat for a set duration (default: 60 seconds)

Type "kick":
Player is kicked from the world

NG word punishment

Controlled by: /spam:ngpunishment (separate from spam punishment)

Type "kick":
After reaching the warning limit, the player is kicked (default)

Type "mute":
After reaching the warning limit, the player is muted

Type "warn_only":
Only warnings are shown; no kick or mute at the limit

NG word warning flow (default):
1st violation → warning (1/3)
2nd violation → warning (2/3)
3rd violation → kick (or mute, depending on settings)

Warning counts are saved per player and persist across reconnects.

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Exemptions

The following players are not checked:

• Server Operators (OP) — exempt by default
• Players with the tag "spam_exempt" — exempt

To exempt a specific player without giving OP:
/tag <player>
add spam_exempt

To disable OP exemption:
/spam:config exempt_operators 0

To re-enable OP exemption:
/spam:config exempt_operators 1

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Commands Reference

All commands start with /spam: and require Operator (level 2).

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View settings

/spam:status

Shows all current settings: language, punishments, limits, exemptions, etc.

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Language

/spam:language <ja|en|both>

Examples:
/spam:language ja
/spam:language en
/spam:language both

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NG word management

/spam:ngword list /spam:ngword add <word>
/spam:ngword remove <word>

Examples:
/spam:ngword list
/spam:ngword add badword
/spam:ngword remove badword

Words are matched exactly as entered (but detection uses normalization at runtime).

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Spam punishment

/spam:punishment mute <seconds>
/spam:punishment kick

Examples:
/spam:punishment mute 60
/spam:punishment mute 120
/spam:punishment kick

When using kick, the optional <seconds>
argument is not required. If you provide it, it still updates the stored mute duration for future mute use.

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NG word punishment

/spam:ngpunishment <mute|kick|warn_only>

Examples:
/spam:ngpunishment kick
/spam:ngpunishment mute
/spam:ngpunishment warn_only

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Fine-tune detection values

/spam:config <key>
<value>

Available keys:

time_window_sec
Time window for rapid-message detection (seconds)
Default: 3

max_messages
Max messages allowed within the time window
Default: 3

same_msg_limit
How many identical messages in a row trigger spam
Default: 3

max_ng_warnings
NG word warnings before final punishment
Default: 3

repeated_char_limit
Max consecutive identical characters allowed
Default: 8

exempt_operators
1 = OPs exempt, 0 = OPs are checked
Default: 1

Examples:
/spam:config time_window_sec 5
/spam:config max_messages 4
/spam:config same_msg_limit 3
/spam:config max_ng_warnings 5
/spam:config repeated_char_limit 6
/spam:config exempt_operators 1

Note: Values must be 0 or greater. For exempt_operators, only 0 or 1 is accepted.

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Admin tools

Unmute a player:
/spam:unmute <playerName>

Reset NG warnings:
/spam:resetwarnings <playerName>

Reload configuration:
/spam:reload

View moderation logs:
/spam:logs
(Shows the 10 most recent events; up to 50 are stored in the world)

Logged events include:
• NG warnings
• NG kicks / mutes
• Spam mutes / kicks
• Manual unmutes
• Warning resets

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Default Settings Summary

Language: both (English + Japanese) Spam punishment: mute NG word punishment: kick Mute duration: 60 seconds Time window: 3 seconds Max messages per window: 3 Same message limit: 3 in a row Repeated character limit: 8 characters Max NG warnings: 3 Operator exemption: Enabled Exempt tag: spam_exempt Max log entries stored: 50

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Recommended Setup Examples

Casual survival server (lenient)

/spam:language both /spam:punishment mute 30 /spam:ngpunishment warn_only /spam:config time_window_sec 5 /spam:config max_messages 5 /spam:config repeated_char_limit 10

Public server (strict)

/spam:language en /spam:punishment mute 120 /spam:ngpunishment kick /spam:config time_window_sec 3 /spam:config max_messages 3 /spam:config max_ng_warnings 2 /spam:config repeated_char_limit 6

Japanese-only server

/spam:language ja /spam:ngword add バカ /spam:ngword add クズ /spam:ngpunishment mute /spam:punishment mute 90

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Player Experience

When muted

Muted players cannot send chat. They see:
You are muted. Remaining: 45s

(or the Japanese / bilingual equivalent, depending on language setting)

Mute status persists if the player leaves and rejoins.

When an NG word is detected

The message is blocked. The player sees a warning:
[Warning] Inappropriate language detected. (1/3)

When spam is detected

The message is blocked. Depending on settings:

Mute example:
Muted for 60s due to spam (rapid messaging).

Kick:
A server-wide notice is shown, and the player is kicked.

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Troubleshooting

Problem: Commands not found Solution: Ensure the behavior pack is active and re-enter the world

Problem: Commands say permission denied Solution: You need Operator level 2 (/op <yourName>
)

Problem: Settings seem unchanged Solution: Run /spam:reload, then /spam:status

Problem: OPs are being muted Solution: Run /spam:config exempt_operators 1

Problem: A player should be exempt Solution: Run /tag <player>
add spam_exempt

Problem: Mute persists after it should end Solution: Run /spam:unmute <playerName>

Problem: False NG word matches Solution: Remove or adjust words with /spam:ngword remove <word>

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Technical Notes

• Chat only: Commands and signs are not monitored.
• Persistence: Config, player mutes/warnings, and logs are stored in world Dynamic Properties.
• Session data: Message timing data is kept in memory and resets when a player leaves (mute/warnings do not).
• Script API: Requires @minecraft/server (Beta APIs).

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Quick Command Cheat Sheet

/spam:status /spam:language both /spam:ngword list /spam:ngword add <word>
/spam:ngword remove <word>
/spam:punishment mute 60 /spam:punishment kick /spam:ngpunishment kick /spam:config time_window_sec 3 /spam:config max_messages 3 /spam:unmute <player>
/spam:resetwarnings <player>
/spam:logs /spam:reload

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Simple Anti Spam