meta_subscribe_webhook

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

No annotations are provided, so the description carries full burden. It only mentions required environment variables but does not disclose side effects (e.g., whether subscriptions are overwritten or appended), error conditions, or any behavioral traits beyond the basic subscribe action.

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 with two sentences. The first sentence states the core action, and the second adds important requirement context. No unnecessary words, and it is front-loaded.

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?

Given the tool has no output schema, the description does not explain the return value (e.g., subscription status or ID). It covers prerequisites but lacks context on success indicators, error handling, or how to verify the subscription afterwards.

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 input schema has 100% description coverage and already explains each parameter effectively. The description adds no additional meaning beyond the schema, so it meets the baseline of 3.

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 tool's purpose: 'Subscribe to webhook notifications for an object (e.g., 'instagram', 'page').' It uses a specific verb ('subscribe') and resource ('webhook notifications for an object'), and distinguishes from sibling tools like meta_get_webhook_subscriptions.

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 mentions prerequisites ('Requires META_APP_ID and META_APP_SECRET'), which is helpful. However, it does not explicitly state when to use this tool versus alternatives (e.g., checking existing subscriptions first) or any conditions for not using it.

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