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

Annotations already declare readOnlyHint=false, destructiveHint=false and idempotentHint=false; the description adds that the image is persisted and that a URL is produced as output, which is real behavioral context beyond the annotations. It stops short of stating retention/expiry, size limits, or that repeat uploads produce distinct URLs, so it is not a full 5.

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, zero filler, with the primary action and output front-loaded and the dependency/requirement hint second. Every clause earns its place.

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 no-output-schema tool, the description covers the essential contract: what it stores, what it returns, and how the result is consumed downstream. Missing constraints (max image size, accepted dimensions, permanence of the upload) keep it from being fully 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?

Schema coverage is 50%: media_type carries defaults and an accepted-value list in the schema, but image_base64 has no description and the tool description adds no encoding, size, or format guidance for it. The baseline of 3 is appropriate given the schema does most of the work and the description does not compensate for the 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?

States a specific verb+resource ('Stores an image') plus the concrete output ('returns a URL') and where that URL goes ('photos[] of place_service_request'). An agent can distinguish this from siblings like place_service_request or get_service_requirements without opening any schema.

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?

Explicitly routes the agent: use the returned URL in photos[] of place_service_request, and consult get_service_requirements to learn whether a photo is mandatory for a given service. It names the alternative tool and the condition that determines need.

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