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

With no annotations provided, the description carries the behavioral disclosure burden. It usefully discloses the edit_key requirement and the fact that the URL stays unchanged when the title changes. It does not describe error behavior, but 'replace' implies overwriting.

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 two concise sentences with the core action front-loaded. Every sentence adds useful information and there is no redundancy or filler.

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 covers the essential operation, the edit_key prerequisite, and a notable behavioral trait. However, it does not explain how to obtain or interpret slug, whether at least one of title/content must be supplied, or what happens on success or failure. Given no output schema, these gaps leave it adequate but not fully complete.

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 only 25%, so the description needs to compensate. It clarifies that title and content are the updatable fields and that edit_key comes from create_page, but it leaves slug's role implicit. This is helpful but not complete.

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 uses a specific verb (Replace) and identifies the target resource (an existing post/page) along with the affected fields (title and/or content). This clearly distinguishes it from create_page, delete_page, and get_page, even though it uses 'post' where the title says 'page'.

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 states a clear prerequisite: the edit_key from create_page is required, and the resource must be an existing post. This gives useful when-to-use context, though it does not explicitly name alternatives or exclusions.

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