Budget Create Budget

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

Annotations (readOnlyHint=false, idempotentHint=false, destructiveHint=false) already establish this is a non-read-only, non-idempotent write, and the description adds only the vague note 'This may create or update Monarch data.' It does not disclose what happens when a budget already exists for the month, whether existing amounts are overwritten, or what consequences the write has, so it adds little beyond the annotations.

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 sentences, so it is appropriately short and front-loaded with the verb. However, the second sentence ('This may create or update Monarch data') is low-value filler that reads like a disclaimer rather than useful behavioral detail, so the brevity is under-specification as much as conciseness.

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 write tool with no output schema and an opaque required 'month' parameter, the description omits essential context: expected month format, behavior on an existing budget, return value shape, and how it differs from the budget_set_* family. An agent would not be able to invoke this correctly or predict its side effects from the definition alone.

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?

The description contributes zero parameter-level information. The schema documents 'fields' and 'output_mode', but the only required parameter, 'month', is described merely as 'Month' with no format guidance (e.g., YYYY-MM), and the tool description does not compensate for that 67% coverage gap.

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 names a verb and resource ('Create budget') so an agent can tell it is a write operation on a budget, but it is vague about scope: it never mentions the month dimension even though 'month' is the sole required parameter, and 'This may create or update Monarch data' muddies what 'create' means. It also does nothing to distinguish itself from the many budget siblings (budget_set_budget_amount, budget_reset_budget, budget_clear_budget).

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 on when to call this tool versus alternatives. Given roughly 20 sibling budget tools including budget_set_budget_amount, budget_reset_budget, and budget_clear_budget, an agent has no criteria to decide which one applies. The second sentence is a data-side-effect disclaimer, not usage direction.

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