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

Annotations already declare destructiveHint=true and openWorldHint=true, so the description's job is to add depth, and it does: it specifies partial-overwrite semantics ('overwrites selected fields'), notes content may land in a public Space, and mentions MCP client authorization. Return value/unset-field behavior is still unspecified, keeping it from a 5.

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 dense sentences with no filler; the purpose is front-loaded, followed by the destructive warning and prerequisites. Slightly compressed, but every clause carries information.

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 6-parameter mutation tool with no output schema, the description covers what it mutates, its destructive nature, prerequisites for the required IDs, and public-visibility risk. The main gap is that null vs. omitted semantics for the nullable fields are left entirely to the schema.

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 carries the parameter burden and the baseline is 3. The description loosely maps prose terms (markdown, URL, parent folder) onto content/external_url/parent_id but adds no format, constraint, or null-handling detail beyond what the schema states.

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 names a specific verb+resource ('rename or edit a Space page/document, folder, or external link') and enumerates the editable aspects (markdown, URL, parent folder). It is clear on its own, though it never differentiates itself from the very similar sibling update-space-document, which an agent could easily confuse it with.

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?

It gives a clear invocation trigger ('when the user wants to rename or edit...') and states a prerequisite and ID source ('Requires numeric space_id and item_id from list-space-documents'). It stops short of naming alternatives or exclusions, so it lacks the explicit when-not guidance needed for a 5.

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