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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and openWorld, so safety behavior is covered. The description contributes only the mild fact that pages are scoped to an ad account and have linked Instagram accounts; it says nothing about what happens with an invalid or inaccessible account, whether results are paginated, or how many pages typically return.

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?

It is short, but the two sentences are largely duplicative — both say 'Facebook pages … usable with a Meta ad account', with the second only adding the Instagram linkage. Space is spent repeating scope instead of stating the action or return shape.

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 one-parameter list tool with no output schema, the description conveys roughly what the list contains. It omits the return shape (page id, name, linked IG account id) and pagination behavior, which an agent needs to use the results correctly.

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 coverage is 100% and the single ad_account_id parameter is fully documented in the schema, including its pattern and cross-reference to list_ad_accounts. The description's phrase 'with a Meta ad account' implies the scoping but adds no syntax or semantics beyond the schema, so the baseline 3 applies.

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 identifies the resource (Facebook pages usable with a Meta ad account) and adds that each page carries a linked Instagram account, but it is a noun phrase with no verb — it never says this is a listing/retrieval operation. It largely restates the title 'List Facebook pages' rather than adding distinguishing detail, and it does not differentiate itself from siblings like list_instagram_accounts or list_ad_accounts.

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 when-to-use or when-not-to-use guidance is given. With near-identical siblings (list_instagram_accounts, list_ad_accounts) in the same namespace, the description offers nothing to route the agent between them.

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