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karbassi

slack-mcp

by karbassi

usergroups_create

Create a user group in Slack. Specify the name and optionally set channels, description, handle, or team ID.

Instructions

Create a User Group.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
channelsNo
descriptionNo
handleNo
include_countNo
team_idNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

With no annotations, the description carries full burden for behavioral disclosure. It only states 'Create a User Group,' omitting side effects, permissions, or outcome details. No contradictions with annotations.

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

Conciseness3/5

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

The description is extremely concise (4 words), which is efficient but insufficient for a tool with 6 parameters. It sacrifices substance for brevity.

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

Completeness2/5

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

Given the complexity (6 params, output schema exists) and no annotations, the description is incomplete. It lacks context about return values, required permissions, or behavior beyond the minimal action.

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

Parameters1/5

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

The input schema has 6 parameters with 0% coverage (no descriptions), and the description adds no meaning to any parameter. It fails to compensate for the schema's lack of clarity.

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

Purpose4/5

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

The description clearly states the action (Create) and the resource (User Group), making the purpose immediately understandable. However, it does not differentiate from sibling tools like usergroups_update or usergroups_enable, which could be clarified.

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

Usage Guidelines2/5

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

No guidelines are provided on when to use this tool versus alternatives. There is no mention of prerequisites, context, or when not to use it, leaving the agent without decision support.

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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