Create Meta Pixel

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

Annotations are sparse (only readOnlyHint false, destructiveHint false, idempotentHint false). The description adds minimal behavioral context beyond stating that it creates a pixel. It does not disclose potential side effects (e.g., duplicates, permissions needed, rate limits), nor does it mention the response format or confirmation. Given the lack of annotations, the description should provide more transparency.

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 description is concise: one sentence stating purpose followed by a bullet list of arguments. It is front-loaded with the primary action. However, the bullet list essentially duplicates the schema, and there is room to add more value without sacrificing brevity (e.g., noting return value).

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?

The tool has no output schema, so the description should explain what the tool returns (e.g., pixel ID, success status). It does not. Additionally, it mentions only two of three parameters, omitting response_format. It lacks context on how pixels relate to ad accounts or any setup requirements.

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 low (33%), so the description must compensate. It lists ad_account_id and name with brief explanations ('Ad account ID', 'Pixel name'), which add basic meaning beyond parameter names. However, it does not explain format requirements (e.g., ID pattern) or constraints (e.g., name uniqueness). The response_format parameter is not mentioned in the description, despite being in the schema.

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 clearly states the verb ('Creates'), the resource ('a new Meta Pixel'), and the purpose ('for conversion tracking'). This distinguishes it from sibling tools like meta_get_pixel, meta_delete_pixel, etc., which operate on existing pixels.

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?

No explicit guidance on when to use this tool versus alternatives. It does not mention prerequisites (e.g., need a valid ad account) or when not to use it (e.g., if the pixel already exists). Sibling tools like meta_update_pixel or meta_get_pixel have different usage contexts, but no comparison is provided.

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