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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false; the description adds genuinely new behavior by stating the no-op on duplicate document IDs, which is exactly the kind of side-effect disclosure annotations cannot express. Minor tension: a same-argument no-op is effectively idempotent, while idempotentHint is false, but this reads as an edge-case clarification rather than a claim of a different operation class.

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 short sentences with zero filler; the primary action is stated first and the duplicate-handling caveat immediately follows. Nothing is repeated from the title or annotations.

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?

With annotations covering safety and mutability, an output schema covering return values, and full schema coverage on the two parameters, the definition supplies what's uniquely missing: the exists-and-no-op semantics. It stops short of saying what is returned or whether existing content is ever overwritten, which for a create-only tool would be the final detail.

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% and both required parameters are documented there, including examples for doc_id and the Markdown semantics of content. The description adds no parameter-level meaning beyond the schema, so the baseline 3 applies.

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 ('Creates a new document in Nodiom Cloud storage'), which is clearly distinguishable from readers like nodiom_get_doc or nodiom_list_docs. However, it never contrasts with the sibling nodiom_write, so an agent cannot tell from the description alone whether nodiom_write would also create a missing document.

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?

'Does nothing if the document already exists' implicitly tells the agent to use another tool (nodiom_write / nodiom_append) for existing documents, which is useful routing context. But that alternative is never named and there are no explicit exclusions or prerequisites, leaving the guidance inferential rather than stated.

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