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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds useful provenance context (the pollToken source and the session-API-key fallback) and frames the call as polling, but says nothing about polling cadence, timeouts, or behavior when no SMS has arrived yet.

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 short sentences, front-loaded with the action and followed by input provenance. Every clause carries information; nothing is padded.

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?

With no output schema and only a 50%-covered 2-parameter schema, the description should say more about the return value (identifying the OTP/code or signaling a pending state). For a polling tool, the absence of any waiting/failure semantics leaves a meaningful gap.

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 only 50% (id is documented as 'activation id', pollToken is not). The description partially compensates by explaining both parameters' origin and that pollToken can be substituted with the session API key, but it does not clarify pollToken's format or why both may be needed.

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: polling an agent rental for the SMS/OTP. An agent can tell it fetches a verification code tied to a rental. It does not, however, differentiate itself from the overlapping sibling ucode_sms_get_code, so the 5-level sibling-distinguishing bar is not met.

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?

Gives concrete guidance on where the inputs come from ('Pass id and pollToken from ucode_agent_rent, or rely on the session API key'), which is useful. It offers no when-to-use/when-not guidance and never mentions the similar ucode_sms_get_code sibling, so routing remains implied rather than explicit.

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