get_history_stats

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states that the tool returns statistics including 'totals and trends' for 'all history sessions', but it does not disclose whether the operation is read-only, any data aggregation details, or potential caveats. The behavioral 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, consisting of two short sentences. The second sentence ('Returns: Statistics about all history sessions including totals and trends') adds a bit of detail but is nearly redundant with the first. Still, it wastes no words and is 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?

Given that this is a no-parameter statistics tool and an output schema exists to describe the return structure, the description is minimally adequate. However, the meaning of 'totals and trends' is vague, and the lack of usage guidance or behavioral details leaves gaps. A more complete description would mention typical use cases or how this differs from 'get_library_stats'.

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 has zero parameters and the schema coverage is 100%, so the baseline is 4. The description adds semantic value by indicating the statistics include 'totals and trends', which gives the agent a sense of what the output covers, even though there are no parameters to document.

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 the tool's purpose: 'Get comprehensive statistics about DJ history sessions' with a specific resource (DJ history sessions) and action (get statistics). It differentiates from siblings like 'get_history_sessions' (listing sessions) and 'get_library_stats' (library-wide stats), though not explicitly naming these alternatives.

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?

There is no guidance on when to use this tool versus alternatives such as 'get_library_stats' or 'search_history_sessions'. The description does not mention use cases, prerequisites, or exclusions, leaving the agent without context for tool selection.

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