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

Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false, so the safety profile is covered. The description adds one genuinely useful constraint beyond them — the caller must own the budget — but says nothing about cascading effects on budget lines, whether deletion is recoverable, or the error behavior for non-owners.

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?

One short, front-loaded sentence with no wasted clauses. It loses a point for the grammatical slip 'a expense_budget' and for being terse to the point of under-specification for a destructive operation.

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 one-parameter delete with full schema coverage, complete annotations and no output schema, the description covers the essentials. However, a destructive tool warranting a note on irreversibility or ownership-failure behavior is left unaddressed, so it is adequate rather than complete.

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?

Single required parameter with 100% schema description coverage, so the baseline is 3. The description adds only the ownership constraint on that id and no format, lookup, or scope details beyond what the schema provides.

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 (delete an expense_budget) and adds the ownership scope, which distinguishes it from the read/update siblings by name convention. It stops short of explicitly routing an agent away from expense_budget_update or expense_delete, but the resource is unambiguous.

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?

There is no guidance on when to delete versus update/archive an existing budget, no prerequisites beyond the implicit ownership, and no note on what happens if the caller is not the owner. The agent must infer all usage conditions from the tool name alone.

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