Check network coverage and operators for a country. Pass package_id and customer_country to get a ready-to-use checkout follow-up step.
| Name | Required | Description | Default |
|---|---|---|---|
| package_id | No | Optional: the package the customer is considering, so the response can suggest checkout directly. | |
| country_code | Yes | ISO country code | |
| customer_country | No | Optional: customer's billing ISO country code. |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false, so no contradiction. The description adds that the output is a 'ready-to-use checkout follow-up step,' but it does not elaborate on response shape, data freshness, or any external data caveats beyond the annotation hints.
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 function, then a targeted usage hint. Every clause earns its place and there is no redundant phrasing.
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 read-only, idempotent tool with 3 well-described parameters, the description provides enough context for an agent to invoke it correctly. The main gap is the absence of an output schema and no explanation of the 'checkout follow-up step' format, but annotations compensate for safety-related context.
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%, so the schema already documents all three parameters. The description adds a small amount of purpose-semantics by linking package_id and customer_country to the checkout outcome, but it does not add detail beyond the schema.
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?
Description states a clear verb ('Check') and resource ('network coverage and operators') scoped to a country, which distinguishes it from siblings like check_order_status and check_device_compatibility. The mention of a checkout follow-up further clarifies its role in the purchase flow.
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 implies when to use the tool—when coverage/operators for a country are needed and optionally to prepare a checkout—but it does not explicitly contrast it with alternatives or state exclusions. Sibling names like get_package_details and search_packages suggest overlap, yet no routing guidance is given.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.
Each tool targets a distinct aspect of the eSIM purchasing workflow: coverage, device compatibility, country listing, package search, package details, checkout creation, and order status. There is no overlap between tools.
All tools follow a consistent verb_noun pattern using snake_case (check_, create_, get_, list_, search_). The verbs are specific to the action and nouns describe the resource, creating a predictable pattern.
Seven tools is well within the ideal range for a domain-specific server. Each tool covers a step in the journey from discovery to delivery, with no redundant utilities.
The tool set covers the entire eSIM purchase lifecycle: discovery (list_countries, search_packages, get_package_details), compatibility verification (check_device_compatibility), coverage assessment (check_coverage), payment (create_checkout), and order tracking (check_order_status). No obvious gaps exist for the intended use case.