webex_download_file

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

With no annotations, the description carries the full burden and does disclose meaningful traits beyond the schema: a 10 MB ceiling, that text is paged rather than returned whole, and that ZIP/JAR contents are listed without extraction. It never states permission requirements or that the call is non-mutating beyond the verb 'Read', which keeps it short of a 5.

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?

Two sentences, no filler. The capability and size limit are front-loaded, the format coverage follows, and the sibling hand-off is last — exactly the order an agent needs.

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?

There is no output schema, so the description does the work of describing return shapes (images, paged text, entry listings), which it does well. It leaves the paging continuation detail implicit — the agent must infer that a nextOffset comes back — which is a small but real gap for a paged read tool.

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 all three parameters are already documented, which sets the baseline at 3. The phrase 'paged text' adds the conceptual link between offset/maxChars and result continuation, but the description does not restate or clarify fileUrl's meaning or the 10 MB limit's relationship to the params.

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 ('Read attachment') and immediately scopes what kinds of content it handles: inline images, paged text, ZIP/JAR entry lists. It names the sibling it is not (webex_save_file), so an agent can distinguish it from webex_get_file_details or webex_save_message_files without opening any 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?

Gives an explicit routing rule: 'For PDF/Office/binary use webex_save_file.' That is a clear alternative with a condition. It does not cover the other plausible alternatives in the sibling set (webex_get_file_details for metadata, webex_get_message_images for images), so the guidance is strong but not exhaustive.

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