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karbassi

slack-mcp

by karbassi

emoji_list

Retrieve custom emoji used in a Slack team, with an option to include standard emoji categories.

Instructions

List custom emoji for a team.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
include_categoriesNoInclude the standard emoji categories in the response when ``True``.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

No annotations provided, so description must carry full burden. It only states the basic action without disclosing behaviors like idempotency, safety, pagination, or rate limits.

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?

Single sentence, front-loaded with verb and resource, no wasted words. Efficient and to the point.

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

Completeness4/5

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

Given the low complexity (one optional parameter, output schema exists), the description is sufficient. It clearly states it lists custom emoji, though it could mention that the return includes standard emoji categories if the parameter is set.

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% for the single parameter, and the description provides the context of 'custom emoji.' However, the tool description does not further explain the parameter's purpose beyond what the schema already states.

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?

The description 'List custom emoji for a team' uses a specific verb ('list') and resource ('custom emoji') with clear scope. It distinguishes from siblings like emoji_add, emoji_remove, and emoji_admin_list.

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 on when to use this tool versus alternatives such as emoji_admin_list. The description does not mention context, prerequisites, or exclusions.

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

Install Server

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