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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false, openWorldHint=false), so the bar is lower. The description adds genuinely useful auth context by naming the required 'project_system_classes:write' scope, but it does not explain what happens on a repeated call despite idempotentHint=false implying duplicates or an error.

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 with zero filler, and the operation is front-loaded ahead of the scope requirement. Nothing could be removed without losing 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 simple two-parameter, no-output-schema link operation the description covers what it does and the required scope. It omits duplicate-handling behavior and any note on pre-existing links, which matters given idempotentHint=false, leaving a small but real 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?

Schema description coverage is 100% and both required UUID parameters are documented in the schema, so the schema does the heavy lifting. The description only restates the two entities involved without adding format, constraint, or ordering information beyond the schema baseline.

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 resource ('a system class to a project'), which correctly signals that this creates an association rather than a new system class entity, distinguishing it from create_system_class. However, it does not explicitly distinguish itself from the nearby siblings create_project_system and create_project_system_group, so an agent must infer the difference from the names alone.

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?

The description gives no when-to-use guidance, no prerequisites beyond the scope, and no alternatives. It never says to use create_system_class first to mint the class, nor references list_project_system_classes to check for an existing link.

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