Slack MCP Server

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

With no annotations provided, the description carries the full burden. It indicates this is a read operation ('Get') and specifies the return format, which is helpful. However, it doesn't mention authentication requirements, rate limits, error conditions, or whether the channel must be visible to the user.

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

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

The description is well-structured with clear sections for purpose, args, and returns. Every sentence adds value: the first states the purpose, the second documents the parameter, and the third describes the return. No wasted words.

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

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

Given 1 parameter with no schema descriptions and an output schema exists, the description does a good job covering basics. It explains the parameter and return format, though more behavioral context (like auth or errors) would help. The output schema means return values don't need full explanation in the description.

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

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

The schema has 0% description coverage, so the description must compensate. It provides the parameter name 'channel_id' with an example value ('C01234567'), adding meaningful context beyond the bare schema. However, it doesn't explain where to find channel IDs or validate format rules.

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

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

The description clearly states the verb 'Get' and resource 'detailed information about a specific Slack channel', making the purpose unambiguous. It doesn't explicitly differentiate from siblings like 'list_channels' or 'get_channel_history', but the focus on a single channel's details is reasonably distinct.

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

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

The description implies usage when detailed info about a specific channel is needed, but doesn't explicitly state when to use this versus alternatives like 'list_channels' for basic info or 'get_channel_history' for message content. No exclusions or prerequisites are mentioned.

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