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Hungry eSIM

by com.hungry-esim
OverviewDiscussionsAdmin

List eSIM top-up options

list_esim_topups
Read-only

List the data top-up (recharge / refill) packages that can be added to an eSIM the customer already owns. Use when the traveller ran out of mobile data or wants more days on a SIM they already bought — topping up reuses the installed SIM, so no new QR code is needed. Pass the ICCID from my_esims. Returns package_code values to pass to topup_esim.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "iccid": "<iccid>"
    },
    "name": "list_esim_topups"
  }
}

Input Schema

NameRequiredDescriptionDefault
iccidYesICCID of the eSIM, from my_esims

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.5/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true, which the description aligns with by stating it's a listing operation. The description adds value by noting that topping up reuses the installed SIM and no new QR code is needed, which is helpful behavioral context beyond the annotation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three concise sentences, each serving a purpose: purpose, use case, and integration. No wasted words, front-loaded with the action.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has a single parameter and no output schema. The description fully explains the input source, the purpose of the output (package_code), and the relationship to other tools. Nothing missing for a straightforward list tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, and the schema already describes the iccid parameter as 'ICCID of the eSIM, from my_esims'. The tool description repeats the source guidance ('Pass the ICCID from my_esims') but does not add new semantic meaning beyond the schema. Baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool lists data top-up packages for an eSIM, using specific verbs and resource. It distinguishes from sibling tools like topup_esim by focusing on listing rather than purchasing.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly says to use when the traveler needs more data or days, instructs to pass the ICCID from my_esims, and explains that the output package_code values go to topup_esim. This provides clear when-to-use and integration context.

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

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