set_photo_description

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

Annotations already indicate this is a non-readonly, non-destructive, idempotent operation. The description does not add behavioral context such as permission requirements or whether the existing description gets replaced. No contradiction with annotations exists.

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 concise sentence that directly states the action. It is appropriately sized for a simple tool, though it omits useful details. The structure is straightforward and front-loaded.

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 simple tool with an output schema, the description is minimal but misses key parameter semantics, particularly what 'ref' refers to. The agent may struggle to know how to fill the required parameters correctly. The lack of usage context further reduces completeness.

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?

With 0% schema description coverage, the description needed to explain the 'ref' and 'description' parameters, but it only mentions caption. The meaning of 'ref' (likely a photo identifier) is left undocumented. Therefore the description does not compensate for the schema's lack of detail.

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 a specific verb 'Set' with the resource 'one photo's description/caption', making the operation clear. It is implicitly distinguished from sibling tool set_photo_title which handles titles, though it doesn't explicitly name the alternative.

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 about when to use this tool versus alternatives like set_photo_title or add_keywords. The description only states the action, leaving the agent to infer usage context. Since there are no exclusions or conditions, this is below average.

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