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

The readOnlyHint annotation already establishes this is a safe, non-mutating read. The description adds useful behavioral context about what is returned (every link, total and unique counts), but says nothing about pagination, result limits, or whether non-clicked links are included — context an agent would benefit from.

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?

Two tight sentences: the first front-loads what the tool returns, the second names the underlying API endpoint. Nothing is wasted and the most important information leads.

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 single-parameter, read-only stats tool with no output schema, the description covers purpose, return content, and the backing endpoint. It is only slightly short of complete, lacking any note on result volume or pagination behavior.

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?

With 100% schema description coverage, the single campaign_id parameter is fully documented in the schema, including that it is a GUID sourced from moosend_list_campaigns. The description adds no syntax or format detail beyond the schema, so the baseline of 3 applies.

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 — listing every link in a campaign with total and unique click counts — which is more precise than a generic 'get stats'. It does not explicitly distinguish itself from siblings like moosend_get_campaign_activity or moosend_get_campaign_activity_by_location, so an agent must infer the difference from the resource name.

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?

Usage is implied: an agent would call this when it wants per-link click performance for a campaign. There is no explicit when-to-use statement, no mention of when to prefer moosend_get_campaign_activity or moosend_get_campaign_activity_by_location, and no prerequisites beyond the campaign_id source noted in the schema.

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