addAccountFunds

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

With no annotations, the description carries the full burden of behavioral disclosure. It reveals only the core operation—charging a card and adding funds—but omits side effects, irreversibility, failure behavior, authorization requirements, or fund availability, which are material for a financial mutation.

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, front-loaded sentence that states the verb, resource, and effect without filler. The API reference link is a helpful addition and does not detract from clarity.

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 two-parameter tool with no output schema, the description plus schema gives the essential information needed to invoke it. However, for a financial operation, missing context about consequences, response format, and constraints means the agent may need to consult the linked API reference.

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 coverage is 100% with clear descriptions and an example for amount. The description adds only marginal context by linking amount to 'add funds' and payment_id to the 'verified card profile,' so it stays at the baseline.

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 specifies the action: charging a verified card profile and adding funds to the account. This distinguishes it from the many domain-management siblings and from getAccountBalance, which only reads the balance.

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?

No guidance is given about when to use this tool versus alternatives, nor are exclusions or prerequisites beyond the word 'verified' mentioned. The description states what the tool does but not the conditions under which an agent should select it.

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