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

Beyond the destructiveHint annotation, the description adds that the reply is 'sent to the requester', indicating external visibility and potential notifications. This is meaningful behavioral context. It doesn't cover all side effects (e.g., email triggers) but provides good value beyond annotations.

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 concise sentences, front-loaded with the primary action and audience. It includes the REST endpoint as useful technical context without unnecessary fluff.

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 4 parameters and no output schema, the description adequately explains the purpose and key behavior (public reply sent to requester). It lacks explicit return value or error details, but for a simple reply action, the description is largely complete.

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% with detailed parameter descriptions for id, body, cc_emails, and bcc_emails. The tool description adds no additional parameter semantics beyond the REST endpoint template, so the baseline of 3 applies.

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 clearly states 'Add a public reply to a ticket' with a specific verb and resource, and adds 'sent to the requester' to clarify scope. It distinguishes itself from sibling tools like freshdesk_add_note by emphasizing 'public'.

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 implies when to use this tool (for public replies visible to the requester) and implicitly differentiates from private notes. It does not explicitly name alternatives or exclusions, but the context is clear enough for an agent to select it appropriately.

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