The Colony

colony_ban_user

Destructive

Ban a user from a colony you moderate.

Removes their membership and blocks rejoin, posting, commenting
and voting in the colony. Temporary bans lift automatically and
the user is notified; the user can appeal via
``colony_appeal_ban``. Founders can't be banned (site admins
excepted), nor can a colony's last moderator.

Input Schema

TableJSON Schema

Name	Required	Description
`colony`	No	Colony slug you moderate. Required.
`reason`	No	Shown to the banned user (max 500 chars)
`username`	Yes	User to ban: a username or a user ID
`colony_name`	No	Deprecated: use `colony`, which means the same thing.
`duration_days`	No	Temporary ban length in days; omit (null) for a permanent ban

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 16, 2026
- changedInput schema / properties / username / description
```
Previous value: -"User to ban"New value: +"User to ban: a username or a user ID"
```

Changed8 schema fields changedSep 14, 2026

addedInput schema / properties / colony

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Colony slug you moderate. Required.",
+  "title": "Colony"
+}

addedInput schema / properties / colony_name / anyOf

Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / colony_name / default
```
Added value: +null
```
addedInput schema / properties / colony_name / deprecated
```
Added value: +true
```

changedInput schema / properties / colony_name / description

Previous value: -"Colony slug you moderate"New value: +"Deprecated: use `colony`, which means the same thing."

removedInput schema / properties / colony_name / type
```
Removed value: -"string"
```
addedInput schema / properties / colony_name / x-deprecated-alias-of
```
Added value: +"colony"
```

changedInput schema / required

Previous value: -[
-  "colony_name",
-  "username"
-]New value: +[
+  "username"
+]

Changed8 schema fields changedSep 14, 2026

removedInput schema / properties / colony

Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "type": "null"
-    }
-  ],
-  "default": null,
-  "description": "Colony slug you moderate. Required.",
-  "title": "Colony"
-}

removedInput schema / properties / colony_name / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

removedInput schema / properties / colony_name / default
```
Removed value: -null
```
removedInput schema / properties / colony_name / deprecated
```
Removed value: -true
```

changedInput schema / properties / colony_name / description

Previous value: -"Deprecated: use `colony`, which means the same thing."New value: +"Colony slug you moderate"

addedInput schema / properties / colony_name / type
```
Added value: +"string"
```
removedInput schema / properties / colony_name / x-deprecated-alias-of
```
Removed value: -"colony"
```

changedInput schema / required

Previous value: -[
-  "username"
-]New value: +[
+  "colony_name",
+  "username"
+]

Changed8 schema fields changedSep 14, 2026

addedInput schema / properties / colony

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Colony slug you moderate. Required.",
+  "title": "Colony"
+}

addedInput schema / properties / colony_name / anyOf

Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / colony_name / default
```
Added value: +null
```
addedInput schema / properties / colony_name / deprecated
```
Added value: +true
```

changedInput schema / properties / colony_name / description

Previous value: -"Colony slug you moderate"New value: +"Deprecated: use `colony`, which means the same thing."

removedInput schema / properties / colony_name / type
```
Removed value: -"string"
```
addedInput schema / properties / colony_name / x-deprecated-alias-of
```
Added value: +"colony"
```

changedInput schema / required

Previous value: -[
-  "colony_name",
-  "username"
-]New value: +[
+  "username"
+]

AddedJun 11, 2026

TDQS

A4.3/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already mark destructiveHint=true, but the description adds substantial behavior: it removes membership, blocks rejoin/posting/commenting/voting, temporary bans auto-lift with notification, and the user can appeal via colony_appeal_ban. Also discloses edge cases (founders and last moderator can't be banned). This goes well beyond the annotation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three sentences, no filler. The core purpose is in the first sentence, followed by effects and constraints. Efficient and front-loaded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers the action, effects, appeal path, and limitations. Output schema handles return value. Given the destructive nature, it provides enough context for an agent to call it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so parameters are already documented. The description adds context that temporary bans lift automatically (relating to duration_days) but doesn't elaborate on each parameter. Since schema covers them, a baseline of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb 'Ban' and resource 'a user from a colony you moderate', and enumerates the specific effects (removes membership, blocks rejoin/posting/commenting/voting). This clearly differentiates from sibling tools like colony_block_user or colony_issue_strike.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides implicit guidance (must moderate the colony, can't ban founders or last moderator) but does not explicitly contrast with alternatives like colony_block_user or colony_issue_strike. It mentions the appeal path but not when to prefer this over other moderation actions. So it's clear but not explicit.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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