Activate yubikey put

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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds nothing beyond that: it does not say what state is changed, whether an existing 2FA method is replaced, what credentials/permissions are needed, or that the body content drives the activation.

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?

A single front-loaded phrase with no filler, but it is terse to the point of under-specification rather than efficient. Nothing is wasted, but almost nothing is delivered.

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?

This is a state-changing 2FA endpoint with three opaque body parameters, no output schema, and no annotations covering semantics beyond safety hints. The description does not supply the missing details an agent needs to construct a correct call, so it is materially incomplete.

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?

All three parameters (form, params, json_body) have 0% schema description coverage, no types, and null defaults. The description mentions none of them, and for a body-driven activation endpoint the agent is left with no idea what belongs in json_body.

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?

"Enable YubiKey OTP 2FA" gives a recognizable verb and resource, and "(PUT alias)" hints this is the PUT form of the same operation. But it never distinguishes this from the sibling vaultwarden_activate_yubikey (or activate_authenticator/duo/webauthn variants), so an agent cannot tell which one to pick from the description alone.

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 "PUT alias" implies equivalence with another activate_yubikey tool but does not say when to prefer this one, what the alternative is called, or what prerequisites (existing YubiKey, 2FA state) apply. No when/when-not guidance is present.

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