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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds meaningful context beyond that: the data is 'credential-free public page data', telling the agent no auth is needed and the values are public aggregations rather than private data. It says nothing about pagination, ordering, or how max_points interacts with the returned series.

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?

A single efficient sentence with the resource and scope front-loaded and no filler. It could arguably add one clause on the alternative sibling without becoming bloated, but it wastes nothing as written.

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?

An output schema exists, so return values need not be described. For a read-only history fetch, the description is minimally adequate but omits the one thing an agent most needs: how this differs from metaculus_question_forecasts, which shares nearly the same name and resource.

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%, so the schema already documents id, method (with allowed values), and max_points. The description's use of 'aggregation' loosely ties to the method parameter but adds no format, default, or constraint detail beyond the schema. Baseline 3 is appropriate.

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 states a specific verb (Returns) and resource (public aggregation forecast history points for one Metaculus question), which is far more precise than a tautology. It does not, however, explicitly differentiate itself from the closely-named sibling metaculus_question_forecasts, leaving the agent to infer that this is time-series aggregation history versus individual forecasts.

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 when-to-use guidance, no exclusions, and no mention of the obvious alternatives such as metaculus_question_forecasts or metaculus_question. The phrase 'from credential-free public page data' hints at the data source but is not framed as usage guidance.

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