get_exercise_entries_month

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

Annotations already declare readOnlyHint and idempotentHint. The description adds the critical behavioral requirement of authentication, which impacts tool invocation. No contradictions are present, and the description enhances transparency beyond the structured fields.

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 sentences, zero wasted text. The purpose is front-loaded in the first sentence, and the mandatory prerequisite is stated in the second. Every sentence serves a clear purpose.

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 one parameter, no output schema, and no nested objects, the description adequately covers the core function and a critical prerequisite. It could optionally mention the return format or behavior when no data exists, but this is not essential given the tool's simplicity and the presence of annotations.

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 coverage is 100%, with the 'date' parameter already described in the schema as 'Any date within the target month (YYYY-MM-DD)'. The tool description does not add any further semantic detail about the parameter, so it meets the baseline expectation without improvement.

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 retrieves 'daily calories expended from exercise for a month' with a specific verb and resource. This distinctly separates it from siblings like 'get_exercises' (which likely lists exercises) and 'get_food_entries_month' (food, not exercise).

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 mentions a prerequisite ('Requires profile auth (check_auth_status first)'), which provides useful context but does not specify when to use this tool over alternatives or when not to use it. No explicit exclusions or alternative tool references are given.

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