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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so safety is covered. The description adds genuinely new behavior: it is template-based and deterministic, it stores nothing, and it returns both the full letter text and a ResumeNext edit/export link (PDF, DOCX, TXT). That is real context beyond the structured fields.

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?

One dense paragraph, front-loaded with purpose, then style semantics, then return value and side-effect guarantees in the last two sentences. The inline style glosses are long but each earns its place by disambiguating the enum; nothing is redundant with the schema.

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?

With no output schema, the description correctly specifies the return payload (full letter text plus an editable/saveable link). It also covers the no-storage/privacy posture for a document about a personal career event. Minor gap: it does not say what happens to omitted optional fields (role, your_name, manager_name), leaving the agent to guess whether placeholders are inserted.

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 would be 3, but the description goes further by defining what each of the three style enum values actually means and which situation each suits, which the terse schema enum does not convey. It leaves the required company/last_day and the name fields to the schema, which is adequate at full coverage.

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?

Opens with a specific verb+resource ('Writes a resignation letter') and immediately scopes it to three named output styles with one-line characterizations of each. An agent knows exactly what artifact it will get and which variant is being produced; no siblings exist to confuse it with.

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?

Gives per-style selection guidance with concrete conditions: standard as 'the safe default for most resignations', formal 'for HR files and strict processes', grateful 'for a manager and a team you want to keep in your network'. That is actionable routing for the one real decision in this call, though there is no explicit when-not-to-use or alternative-tool guidance (none exists).

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