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

Annotations mark the tool as destructiveHint=true, but the description adds meaningful behavioral context by explaining that a technician comment can be private (is_internal=true) or visible to the end user (false), and that comments can be posted as an end-user contact. It does not state permission requirements or rate limits, but the visibility semantics are an important disclosure.

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 two tightly written sentences, front-loading the core action and then parenthetically explaining the modes. The endpoint URL is a useful developer detail without bloat.

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 mutation tool with no output schema, the description covers the required parameters and the two posting modes well. It does not describe return values or error behavior, which is a minor gap given the tool's straightforward add-comment nature.

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 baseline is 3, but the description adds value by clarifying the relationship between technician_id, enduser_id, and is_internal—specifying mutually exclusive posting modes and the effect of is_internal. It does not cover the other parameters (e.g., timestamp_utc, technician_email), but those are already documented in 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?

The description states a specific verb and resource ('Add a comment to a ticket') and clearly distinguishes the two posting modes (technician vs. end user). An agent can identify the tool's exact function without opening the 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?

It explains that a comment can be posted either as a technician (using technician_id) or on behalf of an end user (using enduser_id), and clarifies the meaning of is_internal for private notes versus visible replies. However, it does not name alternative tools (e.g., list_ticket_comments for reading) or state when not to use this tool.

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