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

Annotations already cover the safety profile (readOnlyHint=true, openWorldHint=false), and the description adds genuinely new context: result ordering ('newest first') and pagination semantics ('has_more is true when there are more than limit'). It stops short of stating whether from/to are inclusive or how far back results go by default.

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 short sentences, front-loaded with the resource and ordering, then the pagination flag. Every clause carries information an agent needs; nothing is padded.

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?

With no output schema, the description usefully discloses the has_more field, which the agent could not otherwise know. Remaining gaps are modest for a simple read tool: inclusive/exclusive date semantics and whether a next-page call needs different parameters.

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 75%: from, to and tracker_id are documented in the schema, while limit has only bounds and a default with no prose. The description's 'between two days' and 'more than limit' hint at range and page-size semantics but add no format or edge-case detail, so it lands at the baseline for high-coverage schemas.

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?

States the resource (values logged for a tracker) plus ordering ('newest first') and optional date scoping, which is more than a restated name. It does not, however, distinguish itself from close siblings like get_daily_values, so an agent must infer the difference between raw entries and aggregated daily values.

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?

Usage is only implied: 'the values logged for a tracker, optionally between two days' tells the agent this is a per-tracker entry read with an optional range, but there is no when-to-use/when-not guidance and no mention of the alternative get_daily_values for aggregated views.

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