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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so safety and access profile are covered. The description adds the underlying endpoint path and the returned field set, but says nothing about pagination, result caps, or auth scoping that a large click report would need.

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 terse, front-loaded sentences with no filler. The raw endpoint path in sentence two is mildly redundant with the tool name but is short enough not to hurt.

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?

No output schema exists, so the description carries the return-shape burden and does so at a summary level (contact, email, time). For a single-parameter read tool with annotations covering safety, this is nearly complete, missing only volume/pagination expectations.

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 and schema description coverage is 100% (the email_id format and origin are documented in the schema), so the baseline is 3. The description's 'contact, email address and time' describes output, not the parameter, adding no meaning beyond the schema.

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?

Specific verb+resource: retrieves who clicked a link in a given email, and enumerates the returned fields (contact, email address, time). It distinguishes itself from adjacent report siblings like benchmark_get_email_opens and benchmark_get_email_bounces by naming 'clicked a link' explicitly, though it never names those siblings.

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?

No when-to-use, prerequisites, or alternative routing is given. An agent must infer that this is a per-email engagement report and that get_email_opens/get_email_bounces/get_email_report cover the other metrics, with no textual help.

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