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

Beyond the annotations, it discloses the 2 MB limit, that it verifies the upload exists, that it returns a public logo_url, and the error behavior (retry after uploading). It does not explain the destructiveHint=true implication (whether an existing logo is replaced), which is the one notable gap.

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?

Front-loaded with the core action, then the prerequisite chain and limits. Slightly long due to the multi-step workflow, but each sentence carries actionable information and none is redundant.

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?

With no output schema, the description supplies the return value (public logo_url), the failure mode, the size constraint, and the follow-up for watermark control. An agent has everything needed to invoke it correctly in sequence.

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 100%, so baseline is 3, and the description earns above that by clarifying the derivation and ordering of both params – logo_key must come from create_agent_logo_upload after the image bytes are PUT. This adds workflow meaning beyond the schema text.

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 ('Finish setting an agent's logo') and precisely positions itself relative to the sibling it depends on ('after uploading the image with create_agent_logo_upload'). An agent can distinguish this finish step from the upload step without opening either 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 states when to use it (after the image upload + PUT to upload_url), names the preceding tool, and routes the agent elsewhere for a related concern ('use composition_parameters.logo_watermark_* via update_agent'). Nothing is left to inference.

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