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

Annotations already declare non-readOnly, non-destructive, non-idempotent, and closed-world. The description adds genuine value by stating the required write scope. It does not, however, address behavior on a pre-existing link (relevant given idempotentHint=false) or whether the link can be undone.

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 short sentences, purpose front-loaded ahead of the scope requirement. No filler or redundancy.

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 simple two-parameter link operation whose safety profile is covered by annotations and whose params are fully described in the schema, coverage is nearly complete. The one remaining gap is duplicate-link behavior given the non-idempotent hint, which the description could have addressed.

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 coverage is 100%, so project_id and system_group_id are fully documented in the schema. The description adds nothing about parameter formats or constraints, which is the expected baseline when the schema does the heavy lifting.

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 ('Link') and both resources (system group, project), which is clearer than the tool name 'create' alone. However, it does not distinguish this from close siblings like create_project_system or create_project_system_class, which an agent must infer from the name.

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?

No when-to-use guidance, no prerequisites beyond scope, and no alternatives named. The agent is not told when this association tool is preferred over related siblings such as create_project_system or update_system_group.

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