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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is fully covered. The description adds that templates are account-scoped and enumerates the stored UTM fields, which is genuine added context, but says nothing about result size or ordering.

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 short sentences, front-loaded with the action and scope, followed by the one piece of background an agent needs. No redundant restatement of the title and no filler.

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?

A zero-parameter read-only listing tool with full annotation coverage and no output schema is a low-complexity case, and the description covers purpose and data content. It falls short only on what the response looks like and whether results are paginated.

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 zero input parameters there is nothing for the description to disambiguate, so the baseline is a 4. The second sentence usefully explains what a template object conceptually holds, though it does not describe the returned list structure.

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 ('List all UTM parameter templates') with clear account scope. Siblings like create_utm_template and delete_utm_template make the list/read role unambiguous, though the description never names them explicitly.

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: the verb 'list' plus 'saved to your account' suggests use when you need the account's saved templates, but there is no explicit when-to-use guidance, no mention of paging or result limits, and no pointer to create/delete counterparts.

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