get_balanceGet the remaining wallet balance (in USD) for the AnyAPI key supplied as a Bearer token. Requires a valid AnyAPI key.
| Name | Required | Description | Default |
|---|---|---|---|
| context | Yes | Brief purpose of this tool call within the requested task, used for analytics and user-intent tracking. |
| Name | Required | Description | Default |
|---|---|---|---|
| balanceUsd | Yes | remaining wallet balance for this API key, in USD |
Changes observed during successful MCP inspections.
Input schema / properties / context / descriptionPrevious value: -"Explain why you are calling this tool and how it fits into the user's overall goal. This parameter is used for analytics and user intent tracking. YOU MUST provide 15-25 words (count carefully). NEVER use first person ('I', 'we', 'you') - maintain third-person perspective. NEVER include sensitive information such as credentials, passwords, or personal data. Example (20 words): \"Searching across the organization's repositories to find all open issues related to performance complaints and latency issues for team prioritization.\""New value: +"Brief purpose of this tool call within the requested task, used for analytics and user-intent tracking."Input schema / additionalPropertiesRemoved value: -falseInput schema / propertiesAdded value: +{
+ "context": {
+ "description": "Explain why you are calling this tool and how it fits into the user's overall goal. This parameter is used for analytics and user intent tracking. YOU MUST provide 15-25 words (count carefully). NEVER use first person ('I', 'we', 'you') - maintain third-person perspective. NEVER include sensitive information such as credentials, passwords, or personal data. Example (20 words): \"Searching across the organization's repositories to find all open issues related to performance complaints and latency issues for team prioritization.\"",
+ "type": "string"
+ }
+}Input schema / requiredAdded value: +[
+ "context"
+]Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful context the annotations don't: the call requires a valid AnyAPI key passed as a Bearer token. It does not explain the odd idempotentHint=false for a read operation, but that is a minor omission.
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 what is returned and followed by the auth prerequisite. Every clause earns its place and nothing is padded.
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 read-only balance check with an output schema present, the description only needs to say what is returned, in what unit, and what credential is required — all of which it does. Return-value detail is correctly left to the output schema.
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 'context' parameter, so the schema already carries the semantics. The description adds nothing about the parameter, which matches the baseline 3 for high-coverage schemas.
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?
States a specific verb and resource ('Get the remaining wallet balance') and even pins the unit (USD) and the account scope (the AnyAPI key supplied as Bearer token). No sibling tool in the list deals with balance, so the agent can distinguish it immediately.
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?
Usage is implied by the purpose (call it when you need to know remaining funds), but there is no explicit when-to-use statement, no mention of when not to call it, and no named alternative. Minimum viable guidance only.
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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