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

Annotations already cover the safety profile (not read-only, not destructive, not idempotent, closed-world), so the description's main added value is the behavioral claim that content written here becomes answerable knowledge for agents and apps. It does not disclose what the call returns or that non-idempotency means repeated calls create duplicate notes, which is the operationally important consequence here.

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?

A single front-loaded sentence with no wasted words, covering both the action and its effect. The phrase "like from a document" is slightly imprecise, but the sentence earns its place as a whole.

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 mutation tool with no output schema, the description should say what is created and returned (a note id?) and how it relates to the notebook it is filed in. Instead it stops at the metaphor, leaving the agent without the essentials for confirming success or chaining a follow-up update.

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 67%, below the threshold where the schema can carry the load alone. The description adds no meaning for any of the three parameters; notably the required 'content' parameter has no schema description at all, and the 100,000-character limit and any formatting expectations go unmentioned in both places.

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?

The description states a specific verb and resource ("Write a note into a notebook") and adds the downstream effect that agents and apps answer from it. It is clear what the tool does, but it never names or contrasts with the adjacent siblings add_knowledge_document and update_knowledge_note, so the agent must infer the boundary itself.

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?

There is no when-to-use or when-not-to-use guidance. The clause about agents answering from the note implies a knowledge-authoring context, but nothing tells the agent when to choose this over add_knowledge_document (a longer document) or update_knowledge_note (revising an existing note).

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