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

With no annotations provided, the description carries full responsibility for disclosing behavior. It mentions 'Show the color' but does not explain what the color represents, how the result is delivered, whether it is a map image or data, any prerequisites (e.g., passport format), or potential errors. Billing and group info are not behavioral transparency.

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 very short (three sentences), but two of those sentences are metadata ('Group: V1' and 'Billing per call: 1 Credits') that are not core to the tool's operation. While concise, it forfeits crucial details; the structure is adequate but not front-loaded with the most important behavioral 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?

Given the tool's simplicity (one parameter) and lack of output schema or annotations, the description is still incomplete. It does not explain how to interpret the output (what 'color' means), any limitations, or how it differs from similar tools. An agent could not reliably select and invoke this tool based solely on the description.

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 schema has zero description coverage, and the description only implies the 'passport' parameter by saying 'Passport holder.' It does not specify the expected format (e.g., ISO code, country name) or any constraints. The example 'US' in the schema is not referenced in the description, so the agent gets minimal guidance.

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 clearly states the tool's function: showing the color of visa requirements for a passport holder, matching the title MapColor. However, it does not differentiate from sibling tools like post_v2_visa_map or post_v2_visa_mapall, which likely have similar purposes, so it lacks sibling distinction.

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?

There is no guidance on when to use this tool versus the other map-related siblings (e.g., post_v2_visa_map, post_v2_visa_mapall). The description only states what it does, leaving the agent to guess which tool fits the use case.

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