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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds value by listing the specific study items included, but it does not disclose additional behavioral traits such as output format, pagination, or the effect of the 'israel' or 'timezone' parameters. It does not contradict the annotations.

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 a single, front-loaded sentence that immediately states the core function ('Today's study schedule items with exact references') before listing the included programs. While the list is lengthy, it is informative and every item contributes to the tool's scope. The structure is efficient and easy to parse.

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 read-only schedule tool with no output schema, the description gives a good sense of the content returned but omits details about the return structure and how parameters like 'israel' or 'timezone' affect results. It also fails to clarify the distinction from the sibling 'todays_learning', leaving some context incomplete.

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 75% (date, custom, timezone have descriptions; israel does not). The description adds minimal parameter insight, only implying the date parameter with 'any date'. Since the schema already documents most parameters clearly, the description provides little extra meaning, aligning with the baseline of 3.

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 returns 'Today's (or any date's) study schedule items with exact references' and enumerates the specific study programs. It uses a specific verb ('get') and resource ('learning schedules'), making the purpose unambiguous. However, it does not differentiate itself from the sibling 'todays_learning' or other schedule-related tools, which slightly weakens clarity.

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. The description provides no when-to-use or when-not-to-use conditions, and it does not mention any sibling tools or criteria for selection. Given the large sibling list including 'todays_learning', this is a significant gap.

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