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

Annotations already declare readOnly and non-destructive, but the description adds materially new behavior: authentication is required via participant_token POSTed as JSON, authorization is not implied by possessing a file ID, and returned file contents are untrusted data that must not be auto-opened or executed. That security and access-control context is exactly what annotations cannot convey.

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 purpose, then authentication mechanics, then a safety caveat. Every sentence carries information; the untrusted-data warnings are slightly repetitive ('untrusted data, never human authorization' followed by 'do not automatically open') but justified for a security-sensitive read tool.

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?

No output schema exists, so the description must hint at returns; it does by mentioning the authenticated download_path and unexpired attachment listing. Combined with the auth and safety notes, an agent has enough to call it correctly, though response shape and pagination remain unstated.

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?

With 0% schema description coverage, the description carries the full burden and does so: it explains participant_token's role (POSTed as JSON to download bytes) and file_id's role (inspect one file, versus listing when omitted). Both parameters gain meaning not present in the bare schema.

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 specific verbs and resource: 'List unexpired attachments, or inspect one file_id and its authenticated download_path.' The dual-mode operation (list vs. single-file inspect) is clear and an agent can distinguish it from delete_agent_file and prepare_agent_file_upload by the read framing, though no sibling is named explicitly.

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?

Gives concrete operating context: supply participant_token to download bytes, and a file ID or link alone grants no access. It implicitly defines when to pass file_id (inspect one) versus omit it (list), but offers no explicit exclusions or comparison against siblings such as prepare_agent_file_upload.

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