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

Annotations already mark this as read-only and non-destructive; the description adds the ordering guarantee and the free-account visibility limit, which are meaningful behavioral details beyond the structured annotations.

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, both informative; the core operation is front-loaded and the free-account caveat is delivered without waste.

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 low-complexity read-only tool with an output schema and defaulted optional parameters, the description covers the essential behavior. It is slightly incomplete only in not clarifying pagination behavior of limit/offset, but the schema defaults mitigate that gap.

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 description coverage is 0% and the description does not explain how limit or offset behave, nor does it indicate a maximum or default beyond the account-level 'latest 3' fact. The parameter names are conventional but the description adds no semantic value for them.

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 ('List') and resource ('the user's activities'), and adds ordering ('newest first'). This clearly distinguishes it from singular get_activity and from metric-listing siblings in the toolset.

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 intended use is implied by the name and first clause, and the free-account limit is a useful context caveat. However, it never names alternatives or says when another listing tool would be more appropriate, so routing guidance is left to inference.

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