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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, and the description reinforces this with 'returns text only; nothing is sent'. It adds genuinely new context beyond annotations: the cost ('Free') and the fact that the output is unstructured text with no persisted side effect.

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 clauses, all front-loaded: what it does, what it does not do, and what it costs. No filler, nothing repeated from the title.

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?

The absence of an output schema is offset by 'Returns text only', and side effects are explicitly ruled out, which covers the essentials for a 4-param, 2-required tool. Minor gaps remain: nothing about the tone/format of the drafted reply or whether the draft is retrievable afterwards.

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 coverage is 50%; the two auth-related params (uid, bearer_token) are documented in the schema, but application_id and decision have no schema descriptions. The description echoes the decision enum values in prose but adds nothing about application_id or the auth fallback semantics, so it does not compensate for the coverage gap. Baseline 3.

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 (draft), a specific resource (a reply for one applicant), and enumerates the three possible decisions. The clause 'nothing is sent and the status does not change' separates it from status-mutating siblings like update_application_status without needing to open 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 line 'nothing is sent and the status does not change' makes the use case (preview a reply before committing) and the boundary against update_application_status clear. It stops short of explicitly naming that sibling or stating when not to use it, so it falls 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.