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

Annotations supply only destructiveHint=true, leaving most behavior undocumented. The description usefully discloses that the reply is public and delivered to the requester, but says nothing about notification side effects, permission requirements, or why the operation is flagged destructive. Adds some value, but not rich behavioral context.

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, front-loaded with the action and visibility before the API detail. The REST path is low-value for an MCP agent but costs little; there is no padding or repetition.

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 4-parameter, 100%-documented write tool with no output schema, the description covers action, audience, and endpoint. The main omission is any hint of what the call returns or how the requester is notified, which is minor at this complexity.

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 id, body, cc_emails and bcc_emails are already fully documented in the schema. The description adds no syntax, format, or constraint detail beyond what the schema provides, making the baseline 3 correct.

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+resource ('Add a public reply to a ticket') and immediately disambiguates scope with '(sent to the requester)', which separates it from the sibling freshdesk_add_note (internal note). An agent can pick between the two without opening either 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?

The parenthetical about the reply being sent to the requester implies when this is appropriate (customer-facing communication), but no alternative is named and no when-not condition is given. Usage must be inferred rather than read.

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