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karbassi

slack-mcp

by karbassi

usergroups_users_list

List all users in a specified Slack user group to view or manage group membership.

Instructions

List all users in a User Group.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
usergroupYes
include_disabledNo
team_idNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

No annotations exist, so the description carries full burden. It only states the basic action without disclosing read-only nature, rate limits, pagination, or error handling. Minimal transparency.

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

Conciseness2/5

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

The description is extremely short (one sentence), which is under-specification rather than conciseness. It lacks necessary details about parameters and behavior.

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 a listing tool with an output schema and three parameters, the description should indicate output format (e.g., list of user IDs) and parameter behavior. It fails to provide a complete picture, leaving significant gaps.

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 three parameters with 0% description coverage, and the description adds no meaning. It does not explain the 'usergroup' required field, the effect of 'include_disabled', or the purpose of 'team_id'.

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 verb 'List' and resource 'all users in a User Group', distinguishing it from sibling tools like usergroups_list which lists groups. However, it omits that a specific group ID is required and does not mention optional filtering.

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 guidance is provided on when to use this tool versus alternatives, such as usergroups_users_update or usergroups_list. The description lacks context or exclusions.

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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