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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states 'Retrieves the profile details' and adds meta-information about Group and Billing, without addressing auth requirements, rate limits, output format, or what fields are included. For a tool with zero annotation coverage, this is insufficient depth.

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 descriptive sentence is concise and front-loaded. However, the additional 'Group: Facebook-Profile' and 'Billing per call: 1 Credits' sentences are meta-informational and could be considered filler, which prevents a perfect 5.

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 simple tool with one parameter and no output schema, the description is mostly adequate but still leaves 'profile details' undefined. It does not explain what the returned profile details contain, which is important for an agent deciding between this and the closely related profile_about and profile_photos siblings.

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% (the 'url' parameter is documented with a clear description and example). The description text itself adds no extra parameter semantics, but per the rubric's baseline (high schema coverage → 3), this score 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 uses a specific verb+resource ('Retrieves the profile details') and clarifies the input format ('for a given Facebook profile URL'). However, 'profile details' is vague and largely restates the tool name; it does not specify what details are returned (e.g., bio, followers). It is functional but lacks the precision that would help an agent choose it over the many sibling tools like get_facebook_v3_profile_about or get_facebook_v3_profile_photos.

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 description provides no guidance on when to use this tool versus the numerous siblings (e.g., about, photos, reels). It does not mention alternatives, prerequisites, or typical use cases beyond restating the tool's function.

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