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

No annotations are provided, so the description carries the burden. It does disclose a meaningful behavioral trait — results are limited to the public spectator view and require no authentication — but says nothing about result size, ordering, or whether private tables are silently excluded.

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 sentence with the key qualifier ('without authentication') placed inside the parenthetical up front. Nothing redundant, nothing padded.

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 no-param list tool with no output schema, the description covers purpose and access scope adequately. A brief note on what fields each listed table carries or how it relates to ad_list_tables would close the remaining gap.

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 takes zero parameters, so there is nothing for the description to disambiguate. The baseline for a no-param tool applies, and the description correctly signals the tool is argument-free by describing a fixed listing.

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 (List) and resource (tables) with a scoping qualifier: tables spectatable without authentication. This distinguishes it in substance from ad_list_tables and ad_spectate_table, though it does not name those siblings explicitly.

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 phrase 'can be spectated without authentication' implies the use case (finding public/spectator-visible tables), but the description never says when to prefer this over ad_list_tables or how it pairs with ad_spectate_table. Usage is inferred rather than stated.

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