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

With no annotations, the description carries the burden and does much of it: it discloses the privacy model (unguessable link), the hard size limit (~100 KB) and the concrete failure mode (truncated HTML), which is exactly the kind of behavioral trait an agent would otherwise discover by damaging output. It stops short of stating auth/plan constraints (beyond the schema's Free-tier expiry note) or what happens on partial failure, so not a full 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?

Front-loaded correctly: purpose, then trigger conditions, then parameter guidance, then the size constraint and fallback path. The size-limit paragraph is long, but nearly every clause is load-bearing (limit value, failure mode, ordered fallbacks). Slight over-length keeps it from a 5.

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, and the description compensates by naming the return value (the shareable URL). Combined with full schema coverage and explicit escalation paths for oversized inputs, an agent has everything needed to decide and call correctly.

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 would be 3; the description adds real meaning beyond the schema by insisting on a COMPLETE self-contained document with <!doctype html>, and by telling the agent to call list_projects before using `project` by name. It does not elaborate on `expiry` or `password`, but those are already well-described in the 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 a specific verb and resource ("Publish an HTML document") plus the outcome ("private, unguessable miinideck link") and the return value ("shareable URL"). It is clearly separable from siblings: prepare_upload/finish_upload are named as the path for larger files, and list_projects is referenced for the project parameter.

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 positive trigger ("whenever the user wants to share, publish, host, send, or get a link for an HTML page, report, slide deck, or artifact") and an explicit negative case (files over ~100 KB, ZIP/PDF/image — "do NOT call this tool"). It also routes to concrete alternatives (prepare_upload → curl → finish_upload, the miinideck CLI, or the web uploader).

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