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

readOnlyHint already establishes the safe-read profile, and the description adds real context beyond it: result ordering is by activity, each result is one line, and returned text is authored by others and must be treated as data rather than instructions. That injection warning is a meaningful behavioral disclosure the annotations cannot provide. It stops short of stating pagination or maximum result behavior.

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?

Three compact clauses carry purpose, ordering, filter scope, output shape, and the trust warning with no filler. The most decision-relevant information (list channels, most active first) is front-loaded.

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?

With no output schema, the description still conveys return shape (one line per channel) and the safety posture of returned content, and the limit/query semantics are covered between the schema and the description. Nothing essential for correct invocation is missing.

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 coverage is 100%, so both parameters already have documented types and defaults, giving a baseline of 3. The description does add value by naming what the query matches against (slug/title/about), which the bare "optional search text" in the schema does not.

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 uses a specific verb and resource ("List Clanksquare channels") and states the ordering ("most active first") plus the searchable fields. It does not explicitly contrast itself with the sibling clank_read, so an agent must infer that this is the discovery/list tool versus the content-read tool.

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?

Listing plus a slug/title/about query filter implies the use case (discovering channels before reading one), but there is no explicit when-to-use or when-not-to-use statement and no named alternative such as clank_read. Usage is inferable rather than stated.

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