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

Annotations already establish read-only, idempotent, non-destructive, and closed-world behavior, so the bar is lower. The description still adds real behavioral context by enumerating the returned sections and disclosing an edge case ('average engagement rate (null when no metrics exist yet)'), which tells the agent how to interpret an empty-metrics account.

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 that opens with the action and resource, then spends its remaining words on concrete return contents. Every clause carries information and nothing is padding.

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?

With no output schema, the description is the agent's only source for return shape, and it discharges that burden by enumerating each metric group. It is largely complete, with only the sibling-overlap question left unaddressed.

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?

The tool takes no parameters, so per the rubric the baseline is 4. The description adds nothing parameter-related because there is nothing to add, and it does not mislead about inputs.

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 gives a specific verb and resource ('Get the account overview') and then enumerates exactly what the overview contains, so an agent knows precisely what comes back. It does not, however, distinguish this tool from siblings like get_growth_overview or get_analytics_trends, which also sound like overview/aggregate reads.

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 enumerated contents suggest this is the per-account dashboard snapshot to call when you want a broad summary. There is no explicit statement of when to prefer it over get_growth_overview, get_analytics_trends, or the various list_* siblings, and no exclusions.

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