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

Annotations only declare readOnlyHint=true, but the description adds valuable non-obvious behavior: it returns key metadata and explicitly does NOT return secret key values, plus the authentication requirement. That is meaningful context beyond the annotation, though return shape and pagination are unaddressed.

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?

Front-loaded with the core purpose followed by the high-value caveat about secrets, then the access block. Every sentence earns its place, though the auth instructions are slightly verbose and could be tightened.

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 zero-parameter read tool with no output schema, the description covers the essentials: what is listed, what data comes back and what does not, and the auth prerequisite. Nothing critical to a correct invocation is missing.

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 tool takes zero parameters, so there is nothing to document and the baseline is 4. The description correctly implies an account-scoped, unfiltered listing with no argument surface.

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 ('List all API keys for the authenticated account') and scopes it to the authenticated account. It is distinguishable from create_api_key, revoke_api_key, and regenerate_api_key, though it does not explicitly address its overlap with the sibling get_self_api_key.

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 ACCESS paragraph gives a concrete prerequisite and an actionable flow (authenticate, then re-call), which is real usage guidance. However, it never states when to prefer this tool over siblings such as get_api_key_usage or get_self_api_key, so alternative selection is left to inference.

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