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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered, but the description adds real behavioral detail beyond that: it operates on credential-free public page data and "fails closed on authenticated API responses or Cloudflare challenge pages." That failure-mode disclosure is valuable and not derivable from the schema.

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?

Front-loaded purpose with behavior and limit details following, plus a routing pointer at the end. Four compact sentences with little waste, though the limit restatement duplicates the schema and could be trimmed.

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?

With an output schema present, return values needn't be explained. The description covers the data source, the failure behavior, the row limit, and a routing alternative, which is sufficient for an agent to call this zero-required-param tool correctly.

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 both params are documented in the schema. The description merely restates the limit default (10) and max (25) already present, and says nothing about the optional topic slug beyond what the schema states. 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?

States a specific verb+resource ("Returns normalized Metaculus question rows") and the data source ("credential-free public page data"). It partially differentiates from siblings by naming metaculus_category_questions, though the similar metaculus_project_questions and metaculus_tournament_questions families are not addressed.

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 final sentence names one alternative (metaculus_category_questions) for category questions, giving implied routing. However, it offers no guidance on when this tool is preferred over its other siblings (project/tournament question tools) or what a bare call returns without params.

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