payagents_get_balance

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

With no annotations, the description must carry the burden. It states it 'Retrieves' data, indicating a read-only operation. However, it does not describe error cases, rate limits, or potential side effects, though for a simple read this is likely sufficient.

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 a single, focused sentence that lists exactly what is retrieved. It is concise, well‑structured, and contains no fluff.

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?

Since there is no output schema, the description must explain the return value. It explicitly lists all returned items: spending balance, subscription tier, and active policy limits (per‑transaction and daily). This fully informs the agent of what to expect.

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?

There are no parameters, so schema coverage is trivially 100%. The baseline for high coverage is 3, and the description does not add any parameter‑related semantics because there are none to explain.

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 specific verb 'Retrieve' and the resource (PayAgents spending balance, tier, and policy limits), making its purpose unambiguous. It also implicitly differentiates from sibling tools like pay_url or get_transaction by focusing on current balance and limits.

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 usage (when balance or limit information is needed) but does not explicitly mention when to use this tool over alternatives. No guidance is given for when to choose this over pay_url or get_transaction, leaving some inference to the agent.

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