get_last_activity

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

With no annotations, the description carries full burden for behavioral disclosure, but only states 'Get information', implying read-only. No details are given about data freshness, rate limits, or any caveats. The transparency is minimal.

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 extremely concise: a single sentence with no unnecessary words. It earns its place by being efficient and front-loaded.

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 simple tool with no parameters and no output schema, the description is somewhat complete but lacks context about the nature of 'activity' (e.g., last timestamp, type, source). Given the sibling tools, more specificity would help the agent distinguish usage.

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?

There are no parameters, and the schema coverage is 100% (empty). The description implicitly communicates that no arguments are needed. According to the baseline rule for 0 parameters, a score of 4 is appropriate since the description adds no further parameter meaning but the schema is already complete.

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 'Get information about the most recent logged activity' clearly specifies the verb and resource, but lacks differentiation from sibling tools like 'get_activities' and 'get_user_summary'. It does not define what 'activity' means (e.g., physical activity, system activity), leaving room for ambiguity.

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 guidance is provided on when to use this tool versus alternatives. The description does not mention limitations, prerequisites, or when to prefer sibling tools, offering no decision-making support for the agent.

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