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

With no annotations, the description carries the full burden. It does well to flag that the .p8 is one-time, sensitive and should never be committed, but it omits required account permissions, whether key count is limited, and what happens if the download step is skipped or fails.

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?

Two compact sentences that front-load the action and then the security caveat. Nothing is padded, though the second sentence could be split so the credential warning stands alone.

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 mutation tool with no annotations and no output schema, the description never says what is returned (key ID, issuer ID, scope) or that creation is persistent and must be revoked with revoke_asc_api_key. The credential warning is helpful but the picture is incomplete.

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 50%: download_p8 and notification_message are already described in-schema, and api_key_nickname (the required param) and api_key_role are not. The description only reinforces download_p8's one-time nature and adds nothing about nickname or role, so it barely exceeds the baseline.

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?

States a specific verb and resource ("Create an App Store Connect API team key") that clearly separates it from list_asc_api_keys, download_asc_api_key and revoke_asc_api_key. It doesn't name those siblings explicitly, but the resource noun does the disambiguation work.

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?

Creation is implied by the verb, and the mention of downloading the key hints at the create-then-retrieve flow, but there is no explicit when-to-use guidance, no prerequisites (e.g. role/permission requirements), and no pointer to download_asc_api_key as the fallback.

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