get_authors_by_id_image

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the exact GET endpoint and path structure, but does not disclose behavior such as error responses, image format, or authentication requirements. This is adequate but not rich.

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 extremely concise, with the core purpose front-loaded, followed by the endpoint and argument details. There is no wasted wording or redundant restatement.

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?

This is a simple read-only image-fetching tool with one parameter and an output schema. The annotations cover safety, and the description covers the resource and endpoint. It could mention expected response behavior, but for this low-complexity tool the level of detail is nearly 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 description coverage is 0%, so the description carries the burden. It adds that 'id' is a path parameter and ties it to the author ID, which is useful, but it does not elaborate on format, type constraints beyond the schema, or examples. For a single obvious parameter this is minimally sufficient.

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 and resource: 'Get an author image by author ID.' This clearly distinguishes it from siblings like get_authors_by_id (author metadata) and create/delete_authors_by_id_image (mutations of the image).

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 gives clear context: use this tool when you need the author's image, given the author ID. It does not explicitly mention alternatives or exclusions, but the purpose is unambiguous enough for an agent to select it over the create/delete image siblings.

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