Report today's vision spend

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

With no annotations, the description carries the full burden. It openly states 'without making any device or vision call', which discloses side-effect-free behavior, but it does not describe the output format, potential delays, or any other behavioral aspects. This is a reasonable disclosure but not comprehensive.

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, well-structured sentence that front-loads the verb and resource. Every word adds value, with no redundancy or filler.

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 zero-parameter, no-output-schema tool, the description covers the essential information: what is reported and the guarantee of no side effects. It does not specify the return format or any prerequisites, but given the simplicity, it is sufficiently 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?

There are zero parameters, so the baseline is 4. The description adds meaning about what the report contains (spend and thresholds) beyond the empty schema, which is exactly what is needed for a parameterless tool.

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 uses the specific verb 'Report' and identifies the exact resource ('cumulative vision-provider spend for today') plus the alert/cap thresholds. It is clearly distinct from the sibling action-oriented tools (screenshot, tap, etc.) by stating it makes no device or vision call.

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 implies the tool is for checking spend information and explicitly notes it does not make any device or vision call, but it does not name alternative tools or provide explicit when-to-use guidance. The use case is somewhat obvious given the sibling list, but the guidance is not explicit enough for a higher score.

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