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

Annotations only say readOnlyHint=false and destructiveHint=true; the description goes far beyond this by disclosing that the tool stores in the company-logos bucket, writes companies.logo_url, fails loud on non-image or oversized (2MB) input, and that first use may require manager approval. This is a very full behavioral picture.

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 longer than average but information-dense and well organized. It front-loads the core upload behavior and input format, then sections routing, then the write-tier approval note. Every sentence carries operational value; the length is justified by the number of constraints and exclusions.

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?

The description covers input formats, size limits, failure behavior, storage location, routing to alternatives, and approval requirements. A minor gap is that there is no output schema and the description does not state what the tool returns; for a write operation this is a small omission but not enough to make the description incomplete.

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 baseline is 3. The description adds significant semantics beyond the schema: accepted formats (FO Media/chat-upload artifact UUID, or base64/data URL), explicit exclusion of HTTPS URLs, aliases artifact_id and image_base64, and guidance to pass a square/landscape image without pre-cropping.

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 exactly what the tool does: uploads the company's HUD logo from a file and sets a durable public logo_url. It also names the siblings it is not (update_company.logo_url and generate_image_xai), removing any ambiguity about its role relative to similar tools.

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?

It gives explicit routing conditions: use when an operator or host has a logo file and the HUD shows a monogram; specifically says not to use update_company.logo_url for already-hosted HTTPS URLs and not to use generate_image_xai. It also includes the strong directive 'Do not pass a URL' and explains why (signed URLs expire).

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