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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds the otherwise-unavailable fact that the payload is markdown reference content rather than structured data, which matters for how an agent consumes it. It does not discuss caching or idempotency, so not 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?

Purpose and routing rule are front-loaded in the first two sentences, before the value list. The skill list is long but is essential reference data rather than filler; a minor trimming of trailing period inconsistencies would tighten it.

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?

With one enum parameter and no output schema, the description covers purpose, trigger, alternative, return type, and every valid argument. There is no obvious question an agent would need answered before calling this tool.

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 0% and the enum carries no per-value docs, yet the description enumerates all nine valid values with a one-line scope for each (e.g. 'logic-rules: Conditional logic conditions, actions, patterns, and examples'). This fully compensates for the schema's silence and is the decisive factor in selecting the right value.

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?

States a specific verb and resource ('Load a domain-knowledge skill'), names the enumerated types, and states the return medium ('Returns markdown reference content'). It explicitly contrasts itself with the sibling load_tools, which is a different kind of loading.

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?

Gives an explicit trigger ('Use when the task touches a domain whose conventions or constraints are not obvious from the surrounding tools') and an explicit routing rule away ('For loading additional MCP tool catalogs ... use `load_tools` instead'). Nothing is left to inference.

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