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 the useful qualifier that only 'public' records are returned, but says nothing about whether a missing id errors versus returns empty, or about auth/rate constraints.

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 return verb front-loaded and no redundant filler. The trailing clause 'from dataset id enum value facebook-pages' is slightly awkward but does encode the dataset binding.

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 a fully documented single required parameter, an output schema, and annotations covering safety and open-world scope, the description carries enough for correct invocation. Only the routing to sibling search/facets tools is missing.

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% and the single page_id parameter is already documented in the schema, so the description's 'by page id' adds no syntax or format detail beyond what structured data provides. Baseline 3 applies when the schema does the heavy lifting.

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'), resource ('one public Facebook Page contact record'), and lookup key ('by page id'), which distinguishes it from the list-returning datasets_facebook_pages_search and datasets_facebook_pages_facets. It does not name those siblings explicitly, so the differentiation is inferred rather than stated.

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 explicit when-to-use or when-not-to-use guidance and no mention of alternatives. The phrase 'by page id' only hints that an id is required first (presumably from the sibling search tool), leaving the agent to infer the workflow.

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