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

The annotations already declare readOnlyHint=false, idempotentHint=true, openWorldHint=true, and destructiveHint=false. The description adds the visibility behavior that links are public when the records are public, which is useful context beyond annotations, but it does not explain permissions, duplicate handling, or side effects in enough depth.

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?

The description is a single compact sentence that front-loads the essential action and target options. It contains no filler and is appropriately sized for a short tool definition.

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 six-parameter mutation tool with low schema description coverage and no output schema, the description is too sparse. It omits important details such as who can link records, how rel values should be interpreted, what happens on duplicate links, and what the tool returns.

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 only 17%, so the description needs to carry meaning for most parameters. It clarifies that to_id targets a record and to_url targets a URL, but it does not explain from_id, rel relationship meanings, note, or idempotency_key semantics, leaving most parameters under-specified.

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 states a clear verb and resource: it creates a typed link from a record to either a record via to_id or a URL via to_url. It is more specific than the tool name alone, though it does not explicitly distinguish itself from siblings such as follow or contribute.

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?

There is no explicit when-to-use or when-not-to-use guidance, and no comparison to alternative tools. The description implies usage through the target distinction, but an agent must infer when this is the right linking tool versus other relationship-related siblings.

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