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

The description discloses the critical replace behavior (content replaces the whole page text) and the need to read first, which is important context beyond the annotations (which do not indicate destructive behavior). It also references HTML rules from create. However, it does not clarify that other fields (src, name) are optional and only updated if provided, which could lead to misinterpretation of partial updates.

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 description is exceptionally concise and well-structured. Two sentences front-load the core behavior (replace semantics) and reference sibling tools for additional context without redundancy. Every sentence earns its place, making it easy for an agent to parse and act on.

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?

The description is incomplete for a mutation tool with no output schema. It doesn't mention the return value, doesn't clarify that only provided fields are updated, and doesn't address non-text pages (e.g., image/video) where content may not be used. This could cause an agent to unnecessarily read a page or send full content when only renaming is desired.

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?

The schema covers all 5 parameters with descriptions (100% coverage), so the baseline is 3. The description adds meaningful value by explaining the content parameter's role: it replaces the entire page text and must be sent back in full. It doesn't add detail for src and name, but those are self-explanatory from the schema. The extra insight into content justifies a 4.

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 clearly states the tool updates a journal page, emphasizing the replace behavior ('content REPLACES the whole page text') and distinguishes it from create/delete/get via explicit references to sibling tools. It is specific about the resource and action, leaving no ambiguity about its purpose.

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?

The description provides an explicit workflow: read with journal-page-get, edit, and send full HTML back. It also references journal-page-create for HTML rules, implying when to use this tool vs create. However, it does not explicitly state when not to use it (e.g., for appending) beyond the 'no append' note, and it lacks guidance for non-content updates (like renaming only).

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