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karbassi

slack-mcp

by karbassi

conversations_create

Create a new Slack channel by providing a name; optionally set it as private.

Instructions

Create a new channel.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
is_privateNo
team_idNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

Without annotations, the description carries full burden but only states 'Create a new channel.' It does not disclose behavioral traits like permission requirements, error behavior (e.g., duplicate name), or side effects. The agent is left to infer all behavior from the name alone.

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 very concise (4 words) and appropriately front-loaded, but it lacks any structure or detail. While concise, it may be too minimal to be effective.

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 presence of an output schema, the description does not need to explain return values, but it still lacks essential context about public/private defaults, naming constraints, and the overall creation flow. The description is incomplete for a tool with three parameters.

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

Parameters2/5

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

Schema description coverage is 0%, and the description adds no meaning to the parameters. It does not explain the purpose of 'name', the implication of 'is_private' (public vs private), or when 'team_id' is needed. The agent must rely solely on parameter names.

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?

Description clearly states 'Create a new channel,' which is a specific verb and resource. However, it does not differentiate from sibling tools like conversations_open or conversations_join, which might be used for similar purposes.

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 when to create a new channel versus joining or opening an existing one. The description provides no context for selection among sibling tools.

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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