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 known. The description adds the return shape — 'Returns markdown reference content' — which is genuinely useful since there is no output schema. It stops short of noting size limits or whether content is cached/fresh, 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?

Front-loads purpose, then routing guidance, then the skill catalog. The enumeration is long but each bullet earns its place by describing a distinct skill, which is necessary given 0% schema coverage. Slightly verbose but no filler sentences.

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 one-parameter, annotation-covered read tool, everything an agent needs is present: what it returns, when to call it, when not to, and a full annotated enum. No output schema exists, but the description states the return type, so nothing material is missing.

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 only parameter is a 9-value enum, so the description carries the full burden — and it does: every enum value is listed with a one-line explanation of what that skill contains. This adds meaning the bare enum in the schema cannot.

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 (load) and resource (domain-knowledge skill) and explicitly enumerates the skill domains covered. It also names the sibling it is not — load_tools for MCP tool catalogs — so an agent can route between them without opening either schema.

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 alternative with its own condition ('for loading additional MCP tool catalogs use load_tools instead'). Both when-to-use and when-to-use-something-else are covered.

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