set_budget_amount

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

Annotations already communicate that this is destructive, not read-only, and idempotent. The description adds period-selection semantics, but it does not disclose that an existing budget amount may be overwritten or what side effects occur for affected periods. On balance, the annotations cover the core safety profile, so this is adequate but not rich.

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 first sentence states the purpose, and the Args section is tightly formatted with no filler. Each parameter's explanation is relevant and front-loaded, making the description easy to scan and apply.

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?

Parameter coverage is strong and an output schema exists, so return-value details are unnecessary. However, the description omits important context such as whether budget_name must already exist, whether setting a period overwrites existing values, and how this relates to create_budget. These gaps reduce completeness for an agent deciding whether and how to invoke it.

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 0%, and the description fully compensates by explaining all four parameters: budget_name, account with accepted reference formats, amount with an example, and period with all accepted values and their meanings. This gives the agent everything needed to construct valid arguments.

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 a specific action ('Set a budget target for an account') and names the resource. It does not explicitly contrast itself with siblings like create_budget or get_budget, so it lacks explicit sibling differentiation.

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 provides no guidance on when to use this tool versus creating, retrieving, or deleting budgets. It does not mention prerequisites such as whether the budget must already exist or whether this tool should be used only to adjust existing budget amounts.

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