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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered externally. The description does add real value beyond that — it discloses the response payload and a concrete cost of 2 credits — but it omits any caution about submitting a real password to an external service, which is notable given openWorldHint=true.

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 content is packed into essentially two sentences with no filler, and the cost note is a useful compact trailer. Minor waste from restating the tool name twice ('Password Strength: Password Strength is...') before the substantive content.

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 single-parameter, read-only checker this is close to complete: the agent knows what goes in, what comes out, and what it costs. The remaining gap is the absence of any privacy/security caveat about passing real credentials to an external API, which matters for this specific tool.

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?

Only one parameter, and the schema description coverage is 100%, so the schema already fully documents 'the password to check the strength of'. The description adds no format, length, or encoding guidance beyond that, so the baseline 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 states a specific verb+resource — scores the strength of a password — and enumerates the outputs (label, score, character-type breakdown, weak-pattern detection, entropy, recommendations). It does not, however, differentiate itself from closely related siblings such as PasswordBreachChecker or PasswordGenerator, leaving the agent to infer the boundary.

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?

Usage is only implied: an agent can infer this is for evaluating a candidate password's strength, but there is no explicit when-to-use, when-not-to-use, or pointer to the alternative tool (e.g. PasswordBreachChecker for breach exposure). No prerequisites or context are stated.

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