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

Annotations already provide readOnlyHint, idempotentHint, destructiveHint. The description adds behavioral context: the tool returns data grouped by channel, excludes news channels by default, and interprets dates in Europe/Bucharest timezone.

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 two sentences with no redundant words. It front-loads the core functionality, includes example queries, and states a notable default behavior.

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 the main use case, time range, timezone, grouping, and default behavior. However, it does not explain the 'scope' parameter (main vs all), which is a gap. Output schema exists, so return values are handled externally.

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 low (33%). The description mentions the default exclusion of news channels for the 'exclude_news' parameter, but does not clarify the 'scope' parameter or add format details for the 'date' parameter beyond what the schema provides.

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 prime-time lineup (20:00–23:00 Europe/Bucharest) for a given date, grouped by channel. It includes example queries and distinguishes from siblings by specifying a specific time range and region.

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 says 'Use for queries like...' which gives clear usage context, but does not mention when not to use this tool or provide alternatives among the 14 sibling tools.

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