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

Annotations already mark this as non-read-only and non-destructive, and the description adds useful behavioral details: content must be HTML and a unique folder name is resolved to its ID. It does not go deeper into creation outcomes or error behavior, but the baseline disclosure is adequate.

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 front-loaded sentences with no filler: the core action, the optional page behavior, and the two cross-references all earn their place.

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 simple create operation with fully documented parameters, the description plus schema is sufficient to invoke the tool. The only notable gap is not specifying what the successful response returns (e.g., the new journal's ID), and no output schema exists to cover that.

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 explains name, folder, content, and pageType. The description's folder-name resolution and HTML cross-reference add only modest extra value beyond the structured fields.

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 first sentence states a specific action and object: 'Create a new journal entry, optionally with a first page.' That is clear and immediately separates creation from the many journal mutation siblings, though it does not explicitly contrast with journal-update or journal-page-create.

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?

Creation context is implied by the verb and resource, and the description usefully points to journal-page-create for HTML rules. However, it never states when to prefer this tool over journal-update or journal-page-create, and it does not mention how first pages are added after creation.

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