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

No annotations are provided, so the description carries the full burden. It does disclose that a drive file id is returned and hints at the downstream use (calendar generate context attachment), which is valuable, but it says nothing about required permissions, overwrite/naming collisions, or what happens to an existing file with the same name.

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?

Three short sentences, front-loaded with the action and location. The final sentence about the return value is grammatically rough ('for calendar generate context attachment') but still compact and information-bearing.

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 5-param mutation tool with no annotations and no output schema, the description covers the action, size strategy, and return value, but leaves the required publisher_pid and upload failure/permission behavior unexplained. Adequate but with clear gaps.

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 80%, so the schema already documents file_url, file_base64, upload_filename, and notification_message. The description only restates the file_url-for-large-files rule already present in the schema and adds nothing on publisher_pid, which is the sole required parameter but undocumented in both places.

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 and resource: upload a file into the project Files tab (context/). An agent can tell this is a project-scoped file upload, though the description never distinguishes it from siblings like asset_from_drive, upload_publisher_image, or upload_publisher_video.

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 line 'Use file_url (https) for large files' gives a clear param-selection rule for size, but there is no guidance on when to choose this tool over asset_from_drive or the publisher image/video uploaders, and no stated preconditions.

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