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

Annotations already declare this is a non-readonly, non-destructive, non-idempotent write, and the description usefully adds the return payload ('new document id + URL') plus the docType default of 'general'. It still omits the practically important facts for a non-idempotent create: whether retrying produces duplicates, and whether project access is required — information annotations cannot carry.

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?

The purpose and required inputs are front-loaded in the first sentence, and the return value is stated last where it belongs. The long inline enumerations of content types and docType values are somewhat padded given the enum already exists in the schema.

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, and the description compensates by naming the return value (id + URL). Required inputs, the optional docType with its default, and the markdown body are all covered; only the injected projectId and retry/duplication behavior are unaddressed.

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 all four parameters are already documented, and the description's restatement of title/markdown adds little. One useful addition is the docType default ('defaults to "general"'), but its claim that docType can be 'any label' conflicts with the schema's closed enum, which muddies rather than clarifies the 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 and resource ('Create a Library document from markdown') and enumerates the kinds of content it is meant for, so the agent knows exactly what object is produced. It does not name the write-path siblings (append_to_document, update_document) that an agent might confuse this with, so it falls short of the top score.

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 by the examples ('meeting notes, release notes, retrospectives, PRDs...') and by 'saves drafted content straight into the Library', which tells the agent this is for publishing already-drafted markdown. However there is no explicit when-not guidance and no routing to append_to_document for existing documents or update_document for edits.

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