Create an album and fill it in one call

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

Annotations already mark destructiveHint=true, and the description adds important behavioral context beyond that: 'There is no API to delete uploaded media', 'Requires confirm: true', and 'leaves no empty album behind if the uploads fail'. This meaningfully discloses consequences and transactional behavior, exceeding what the annotations alone provide.

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 brief and front-loaded with the primary purpose in the first sentence, followed by high-value caveats and constraints. Every sentence adds operational information without redundancy.

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 composite mutation tool with six parameters and no output schema, the description together with the rich schema covers purpose, safety, limitations, and alternatives. It could mention what the tool returns, but that is not essential for correct selection and invocation given the schema's 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?

Schema description coverage is 100%, so the schema already documents every parameter fully. The description reinforces 'Up to 20 URLs' and 'Requires confirm: true', but adds little new parameter meaning beyond the schema's existing descriptions.

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: create an album and upload files in a single step. It explicitly names the three siblings it composes (create_album, upload_from_url, add_to_album), clearly distinguishing it from them.

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 says this tool saves three round trips over the listed alternatives and notes that it leaves no empty album behind if uploads fail, giving a clear reason to choose it over the multi-step flow. It also warns about the irreversible nature of uploads, which helps the agent decide when caution is needed.

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