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

The annotations already declare read-only, idempotent, non-destructive and closed-world behavior, so the safety profile is covered. The description adds the return linkage ('ids that fetch takes'), which is genuinely useful, but says nothing about match semantics (exact vs fuzzy), result contents, or empty-result behavior – and there is no output schema to fill that gap.

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 core action, and no padding. 'in the shape ChatGPT connectors use' is a slightly opaque bit of protocol jargon, but overall the text is efficient.

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 one-parameter read tool with full schema coverage and annotations, the essentials are present, and the fetch-chaining hint partially compensates for the missing output schema. It remains thin on what a result actually contains and how matches are determined.

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 description coverage is 100% for the single 'query' parameter, so the schema already documents it. The description's 'by place name' merely restates the schema's 'Place name.' without adding format or matching details, so the baseline 3 applies.

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 gives a specific verb and resource ('Search eSIMpass destinations by place name') plus the scoping field, so an agent knows exactly what is being searched. However, it never distinguishes itself from the near-identically named sibling 'search_destinations', which leaves real ambiguity about which search tool to pick.

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?

'Returns ids that fetch takes' hints at a search-then-fetch pipeline, but there is no explicit when-to-use guidance and no exclusion or alternative named. With a sibling literally called 'search_destinations', the absence of any routing rule is a notable gap.

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