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

No annotations are provided, so the description carries the full burden. It discloses that no authentication is required and describes the return value (claimed and remaining slots). The read-only nature is implied by 'Check' and 'Returns', though it could explicitly state it does not modify any state.

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 two sentences, front-loaded with the main purpose and then providing key details. Every word serves a purpose, with no filler or redundant information.

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 tool with no parameters and no output schema, the description covers purpose, return value, and authentication requirement. It could possibly mention the exact response format or any caveats (e.g., promo availability), but it is adequately complete for a status check of this simplicity.

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 has zero parameters, so the input schema provides no information. The description adds context about what the status refers to (free PRO tier for first 100 agents) and what details are returned, which is valuable beyond the empty schema. Baseline for 0 params is 4, and the description satisfies that.

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 states a specific verb ('check') and a specific resource ('launch promo status'), and clearly explains what the tool does: it reports how many of the 100 free PRO slots are claimed and remaining. This distinguishes it from related siblings like 'claim_free_pro_upgrade' and 'check_humanity_status'.

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 clearly indicates this is a read-only status check for the promo, with no authentication required. While it doesn't explicitly name alternatives or state when not to use it, the context is clear for a simple tool of this nature.

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