Create Meta Pixel

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

Annotations already indicate a write operation (readOnlyHint=false) and non-destructive behavior (destructiveHint=false). The description adds the conversion-tracking purpose but does not disclose other behavioral aspects such as non-idempotency (creating a new pixel each call) or that no duplicate enforcement is mentioned. It does not contradict annotations, but adds little beyond them.

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 brief and functional, but the Args list duplicates schema information and omits the response_format parameter. It is not verbose, but it could be better structured by integrating parameter explanations inline rather than a separate list that adds little 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?

For a creation tool with no output schema, the description does not mention the return value (e.g., the created pixel ID), error conditions, idempotency implications, or any prerequisites like needing an existing ad account. An agent would likely need to infer these, making the description incomplete for confident invocation.

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 only 33%, with only response_format having a description. The tool description lists ad_account_id and name with trivial descriptions ('Ad account ID', 'Pixel name') that merely restate the parameter names without adding format hints (e.g., ad account format like 'act_123') or constraints. It omits the response_format parameter entirely. Low coverage and minimal added meaning result in weak parameter guidance.

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 indicates the action ('Creates'), the resource ('Meta Pixel'), and purpose ('conversion tracking'). It distinguishes this from sibling pixel tools like meta_list_pixels, meta_get_pixel, or meta_delete_pixel by implying a creation operation.

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 does not explicitly state when to use this tool relative to alternatives like meta_list_pixels or meta_update_pixel. An agent can infer its purpose, but there is no guidance on preconditions (e.g., requiring an ad account) or when to prefer another tool. Sibling names provide context but the description itself lacks direct comparison.

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