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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered without description help. The description adds genuinely new behavioral context: this is a mandatory prerequisite step, and it discloses the nature of the returned payload (rules covering file layout, analytics section markup, technical requirements). It stops short of saying anything about output format or size.

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 sentence with the imperative constraint front-loaded first, followed by the payload contents in parentheses. Nothing is padding; every clause tells the agent either when to call or what it will get.

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 parameterless knowledge-retrieval tool with no output schema and annotations that already cover safety, the description supplies the essential pieces: the precondition and the subject matter of the returned rules. Only the return format (e.g., markdown vs. structured spec) is left implicit, a minor gap.

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 tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline of 4 applies. The description correctly implies a global, argument-free reference lookup.

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 concrete resource — the markup rules a Pageree landing page must follow — and enumerates its contents (file layout, section markup for analytics, technical requirements), which cleanly separates it from the other get_skill_* siblings like get_skill_best_practices. It is clear what an agent receives, though it doesn't explicitly contrast itself with any named alternative.

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?

"REQUIRED before writing page HTML" is an explicit, unambiguous triggering condition that tells the agent exactly when to call this rather than proceeding to author markup. What's missing is any exclusion or named-alternative guidance (e.g., pointing to get_skill_analytics when only analytics markup is needed).

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