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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. Without an output schema, the description usefully discloses the shape of the result (monthly digest of key events grouped by section plus an overview), which is real added context beyond 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?

Two sentences, no filler. The content scope is front-loaded and the usage/default rule follows immediately, with every clause carrying information.

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, single-optional-parameter tool with no output schema, the description covers purpose, scope, default behavior and the general return structure. It is nearly sufficient; only a hint about granularity, pagination or size limits is missing, which is minor here.

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 100% and the single 'month' parameter is fully documented in the schema, including the YYYY-MM format and the omit-for-latest rule. The description's 'omit month for the latest' restates the schema rather than adding format or edge-case detail, so this is the baseline 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 names a specific verb and resource ('Get BITHOT's edited monthly report') and characterizes the content precisely ('the month's most important events chosen from its dailies, grouped by section, with an overview'). The 'chosen from its dailies' phrasing also draws the boundary against the bithot_get_daily and bithot_get_weekly siblings without needing their schemas.

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?

It states when to use it ('for what happened this month or in a given month') and gives the default behavior ('omit month for the latest'), which is clear usage context. It stops short of explicitly naming alternatives such as bithot_get_weekly or bithot_get_daily as the fallback for non-monthly queries, so it is clear but not fully routing.

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