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

Annotations already declare it is not read-only, is idempotent, and is open-world. The description adds non-obvious behavior: the interview prerequisite, the always-202 async response, and the event chat becoming read-only after delivery. It does not contradict annotations, though it could clarify what the 202 response implies for the caller.

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?

It is very short and front-loads the prerequisite before the mode and state information, with no filler. The telegraphic fragments ('Text or prepare:true; always 202') are concise but slightly reduce readability.

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 four-parameter tool with annotations and full schema coverage, the description supplies the key operational context: prerequisite, async response, and post-delivery restriction. It does not need to explain return values because there is no output schema, though it could clarify the consequence of the 202 response.

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 baseline is 3. The description reinforces the text-vs-prepare choice ('Text or prepare:true'), but it does not add format, length, or idempotency semantics beyond what the schema already documents.

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 never states a clear verb+resource such as 'send a message to the event chat'; it relies on the title and fragments like 'Text or prepare:true.' An agent can infer it composes an event-application message, but the purpose is not stated directly, and sibling differentiation is only implicit through the post-delivery read-only note.

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 gives a prerequisite ('Complete the full interview first'), a choice of modes ('Text or prepare:true'), and an explicit when-not/alternative ('After the application is delivered the event chat is read-only; continue in the private chat from links.chat'). That covers when to use it, when not to use it, and where to go instead.

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