get_sessions

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

With no annotations, the description carries full burden. It discloses the returned fields but does not mention read-only nature, rate limits, authentication requirements, or pagination behavior beyond offset/limit. Adequate for a simple list tool but could be more transparent.

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 well-structured with a front-loaded purpose statement, a field list, a usage example, and parameter definitions. It is concise but could potentially omit the field list if the output schema is rich, though the output schema is not shown.

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?

Given 8 parameters (none required) and an output schema, the description covers parameter semantics and usage context well. It lacks information on sorting, performance, or rate limits, but overall it is complete enough for an agent to select and invoke 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 description coverage is 0%, so the description must compensate. It does so effectively with an Args section explaining each parameter's purpose, valid values, and defaults. This adds significant meaning beyond the schema's basic titles.

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 clearly states 'List recent visitor sessions with filtering' and enumerates the fields included in each session. This distinctively differentiates it from siblings like get_session_detail (single session) and get_anomalies/funnels (different analyses).

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 provides explicit usage examples ('frustrated mobile users, visitors from a specific country, or high-friction sessions') and implies when to use this tool for listing vs get_session_detail for detail. It could improve by explicitly stating when not to use it, but the examples offer strong guidance.

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