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

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=false, so the safety profile is covered. The description adds genuinely new context — the required `channels:read` scope — but says nothing about return shape or behavior when the ID does not exist.

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?

Very short and front-loaded, with the permission requirement placed after the core action. The opening line duplicates the annotations title, so a sentence of the text is redundant rather than earning its place.

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 simple read-only single-record lookup this is close to adequate, and annotations plus the input schema cover most of what an agent needs. With no output schema, though, the description could say what a channel object is or what happens on a missing ID, and it leaves the nested request envelope unexplained.

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?

Schema description coverage is effectively 0% at the parameter level (only the inner `id` field carries a terse description), and the nested `request` wrapper is undocumented anywhere. The description's "by ID" confirms the parameter's meaning but adds no format, source, or constraint detail.

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 ("Get a channel") and narrows scope with "by ID," which implicitly separates it from channels-list and channels-update. It never names a sibling explicitly, so differentiation is inferred rather than stated.

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?

"by ID" implies this is the single-record retrieval path versus channels-list, and the `channels:read` permission note gives a prerequisite. There is no explicit when-to-use/when-not guidance or mention of alternatives such as channels-list for enumeration.

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