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

With no annotations, the description carries the full burden and does so well: it discloses that recipients must supply a name and valid email before reading, that the file is encrypted at rest, and that downloads are denied pending owner approval. It omits owner-side auth/permission requirements and failure behavior, so it is strong but not exhaustive.

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, purpose front-loaded, and every sentence carries information about behavior or input mode. The middle sentence is dense but each clause adds a distinct security-relevant fact rather than padding.

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 9-parameter mutation tool with no annotations and no output schema, the description covers the key behavioral contract (recipient gating, encryption, download approval) and the input-mode options. It stops short of describing the returned link's shape or any expiry/ownership requirements, which leaves a small gap.

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 the baseline is 3. The description adds one genuinely useful piece of semantics by presenting url, content_base64, and storage_path as alternative input modes, but it does not resolve precedence when multiple are supplied and never mentions the required filename parameter.

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 pair: upload a document and return a private share link, which is clearly distinguishable from ncrypt_add_share_link and ncrypt_list_documents by the upload-and-create framing. It does not explicitly name or contrast with the sibling tools, so it falls 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?

Usage is implied rather than stated: the third sentence enumerates the three ways to supply the file (base64, public https URL, owner storage path), which tells the agent how to invoke it. However, there is no explicit when-to-use versus ncrypt_add_share_link, no prerequisites, and no guidance on which input mode to prefer when several are available.

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