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

Annotations already declare this is a non-read-only, non-idempotent, non-destructive write. The description adds genuinely new behavioral facts: channels are created with default rules, the project's first channel becomes its default, and the call requires the channels:write permission. That is substantive context beyond the structured fields.

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?

Short and mostly front-loaded, with the key constraints in one sentence. The leading line duplicates the title and the 'Create a channel in a project' clause, wasting roughly a fifth of the text.

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?

For a create tool with no output schema, the description covers the essentials an agent needs before calling: permission requirement, default-rule behavior, and the first-channel-becomes-default side effect. It omits the uniqueness constraint on key and what the response returns, but neither is blocking.

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 description names no parameters and adds nothing about the request body or projectId. The schema's nested properties (key, contentType, description) do carry descriptions, so the effective documentation gap is smaller than the reported 0% coverage suggests, but the description itself contributes zero parameter meaning.

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?

States a specific verb and resource ("Create a channel") plus the placement scope ("in a project"), which distinguishes it from siblings like channels-update or channels-duplicate. The first line merely repeats the title, but the second sentence carries the real purpose.

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 permission requirement ("channels:write") and project scoping imply when the tool is applicable, but no alternative is named and no exclusion is given — an agent could reasonably confuse this with channels-duplicate, which also produces a channel.

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