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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is fully covered. The description adds the useful detail that results include performance metrics, but says nothing about error behavior for invalid IDs, auth requirements, or rate limits.

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?

A single front-loaded sentence with no filler; both clauses earn their place, with the detail clause ('including performance metrics') doing real work by signaling the payload scope.

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?

There is no output schema, so the description carries the burden of describing return content, and 'full details ... including performance metrics' is only indicative rather than concrete about what fields come back. For a simple single-parameter read tool with full annotation coverage this is adequate, but an agent cannot predict the response shape.

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?

Only one parameter exists and schema description coverage is 100%, so the schema already documents campaign_id. The description repeats 'by ID' without adding format, source, or where to obtain the ID, which is the baseline 3 case.

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 full details of a specific MailerCloud campaign by ID') and hints at scope ('including performance metrics'), which separates it somewhat from the narrow sibling tools like get_campaign_opens, get_campaign_clicks and analyze_campaign. It stops short of explicitly positioning itself as the superset/details view versus those siblings, so it is clear but not fully differentiated.

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 only implied: an agent infers it should call this when it has a campaign ID and wants details. There is no explicit statement of when to use this versus list_campaigns, analyze_campaign, or the per-metric campaign tools, and no mention of prerequisites such as needing a valid ID first.

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