get_exercise_stats

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

Despite the absence of annotations, the description discloses behavioral details by specifying the response fields (isLift, lastPerformance, personalRecord, workingMax) and the default behavior of stat_date (defaults to today, format YYYY-MM-DD). However, it does not explicitly state that this is a read-only operation or explain edge cases, but it adds meaningful context beyond the schema.

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 concise and well-structured: two sentences, front-loaded with the purpose and followed by essential parameter and response details. No extraneous content.

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?

The description covers key aspects: purpose, parameter format, and response structure. However, it lacks definitions of what personalRecord and workingMax represent (e.g., all-time vs. current), and it remains ambiguous how this tool relates to specialized siblings. With no annotations and no output schema, these gaps leave moderate ambiguity.

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 description adds useful context for stat_date, specifying format and default behavior, which the schema omits (schema default is null). However, it provides no additional meaning for exercise_id beyond its schema type and requirement, and with 0% schema coverage, more compensation would be expected.

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 main function: obtaining stats for an exercise, specifically last performance, personal record, and working max. This is a specific verb and resource, but it does not explicitly differentiate from sibling tools like get_personal_records or get_working_max, leaving some ambiguity about selection.

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 no guidance on when to use this tool versus related tools such as get_personal_records or get_working_max. It offers no alternatives or exclusions, leaving the agent to infer usage context.

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