approve_expense

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

Annotations carry only a title, so the description bears the full burden of behavioral disclosure. It implies a state transition from pending to approved but says nothing about required permissions, irreversibility, downstream effects (e.g., triggering payment), or what the result looks like.

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?

A single, front-loaded sentence with no filler. It is efficient, though its brevity contributes to the missing usage and behavioral detail rather than being purely a virtue.

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 mutation tool with no behavioral annotations and no output schema, this description is too thin — an agent cannot tell what approval does, whether it is reversible, or what it returns. Only the parameter names are covered, via the schema.

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 100%, so both parameters (expense_id, notes) are already documented in the schema. The description adds no meaning beyond identifying the target object, so the baseline of 3 applies.

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 states a specific verb (approve) and resource (expense report) and specifies the precondition that the report is pending. It does not, however, differentiate itself from the many other approval siblings such as approve_invoice, approve_time_off_request, or approve_off_cycle_payment.

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 use this tool versus alternatives like decline_expense or the other approve_* tools, and no mention of prerequisites such as the caller's role or the expense being in a pending state beyond the passing adjective.

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