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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, covering the safety profile. The description adds context about the metrics returned and the bounded date range, but it does not disclose potential behaviors like pagination, response format, or how optional parameters (inbox_ids, office_hours) affect results. Since annotations cover the main traits, this is adequate but not rich.

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?

The description is a single, dense sentence that front-loads the core purpose and metric list. Every clause adds value, and there is no filler or repetition. It is efficient and well-structured.

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 read-only report tool with no output schema, the description explains the primary inputs (date range) and the outputs (metric names and the interpretation of improvement). It does not mention the output format or how optional parameters alter the report, but these are minor gaps given the tool's simplicity and the schema's coverage. It is sufficient for an agent to call it correctly.

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 80% with descriptions for start, end, _apiKey, and inbox_ids; only office_hours lacks a description. The description mentions 'bounded date range' which relates to start/end but adds no new syntax or format details beyond the schema. With high schema coverage, the baseline of 3 is appropriate.

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 states a specific verb ('Return') with a clear resource (Help Scout email-support metrics) and lists the exact metrics (volume, replies, response time, etc.) and the date-range scope. It clearly distinguishes from sibling tools that list or get individual conversations, and the purpose of answering whether support improved/deteriorated adds clarity.

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?

The description implies when to use it (for aggregated support metrics over a date range) but does not explicitly contrast it with alternatives like helpscout_list_conversations or helpscout_get_conversation. There is no explicit 'use this when' or 'use that instead' guidance, though the purpose is reasonably inferred.

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