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

Annotations already declare readOnly=false, destructive=true, idempotent=true and openWorld=true, so the safety profile is covered. The description adds genuinely new behavioral constraints: the 4 MB payload ceiling, the ~3 MB practical limit for base64 content, and the 4.5 MB request cap. It does not explain overwrite semantics despite destructiveHint=true, which keeps it from 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?

Three sentences, front-loaded with the core action and supported formats, then parameter routing, then the size caveat. Every sentence carries information, though the base64 arithmetic is slightly verbose.

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 annotations cover the mutation profile, so the description only needs to add operational detail — which it does via formats and size limits. It lacks any statement about what happens to previously published content, a notable gap for a destructive, idempotent write.

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 schema already documents every parameter including the content-vs-content_base64 choice. The description's contribution (the size effect of base64 encoding) is marginal, so baseline 3 is appropriate.

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+resource: publishing content onto a share link, and enumerates supported formats (HTML, text, Markdown, PNG, JPEG, PDF). The intent is unambiguous, though it never names the sibling share_get to draw a contrast, so it stops short of a 5.

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 description implicitly frames usage ('so a human can see it') and gives per-parameter routing ('Use content for text or content_base64 for images and PDFs'). However there is no when-not guidance, no prerequisites (e.g., whether an instance/share link must already exist), and no explicit alternative-tool routing.

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