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

The readOnlyHint is already provided by annotations, and the description adds useful context by mentioning 'no-key access' (auth behavior) and outlining what the operation covers. It does not contradict the annotations and discloses enough for a simple no-parameter read operation.

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 compact sentence that front-loads the key idea and packs the relevant dimensions into a parenthetical. It is slightly awkward grammatically, but every element earns its place and there is no filler.

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?

There is no output schema, so the description carries the burden of explaining return values. It lists the main content categories (included access, plan additions, pricing, links) at a sufficient level for an agent to call a parameterless tool correctly, though exact output formatting is not specified.

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?

The tool has zero parameters, so there is nothing for the description to explain beyond what the empty schema already conveys. The description adds no parameter-specific ambiguity, matching the baseline for a no-parameter tool.

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 identifies a clear resource ('no-key access', 'free account', 'paid plans') and the specific content areas (history depth, datasets, row limits, price). It is obviously distinct from the sibling tools, which all deal with tables or SQL queries, though it lacks an explicit verb like 'returns' or 'lists'.

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 implied through the content: an agent would use this when it needs plan or limit information. However, the description does not explicitly state when to choose this tool over alternatives, nor does it mention any exclusions or prerequisites.

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