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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=false and openWorldHint=true; the description goes further by disclosing the notification side effect (watchers and @mentioned users are notified) and that the created comment cannot subsequently be edited or deleted through this server. It does not cover error modes or whether duplicate submissions create duplicate comments.

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?

Three short sentences, front-loaded with the operation type and the primary side-effect warning, with zero filler. Nothing repeats and nothing is buried.

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 no output schema, the description could say more about what is returned, and it says nothing about authentication or permissions needed to comment on a record. However, for a simple create-comment tool it covers the operation, the side effects, the irreversibility, and the underlying endpoint adequately, and the annotations carry the safety profile.

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%, so the schema already documents all three parameters including the enum values and the 'id, not number' distinction. The only marginal addition is that @mentions inside the text trigger notifications, which touches the 'comment' parameter semantics; otherwise the enum list in the description merely restates the schema.

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?

Starts with a WRITE marker then states a specific verb+resource ('add a comment') and enumerates every supported record type, which mirrors the commentable_type enum. An agent can immediately distinguish this from the read-side sibling fleetio_list_comments.

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 'WRITE:' prefix and the enumeration of commentable records clearly signal the context in which to call it, and the statement that comments 'cannot be edited or deleted by this server' implicitly warns that this is a one-way operation. It never names an alternative tool or states explicit exclusions, so it stops short of a 5.

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