init

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

Discloses that the PIN is never stored, only a PBKDF2 hash for verification. Mentions default path and env variable. With no annotations, this description does a good job at behavioral transparency, though it could note whether it creates directories.

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 sentences, each adding essential information: action/failure condition, security detail, path configuration. No filler words, front-loaded with the core purpose.

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 simple initialization tool with no output schema and one parameter, the description covers the purpose, failure condition, security aspect, and configuration. It could mention what happens if the missing directory must be created, but overall it's sufficient.

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 100% with the pin parameter described as 'PIN at least 4 characters.' Description echoes that requirement ('PIN at least 4 characters') but does not add additional semantics beyond the schema. Baseline score 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?

Clearly states the action (initialize), the object (vault file), and the means (with a PIN). Distinguishes from siblings like fetch, list, etc., by focusing on first-time setup. Explicitly mentions failure condition if vault exists.

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?

Implicitly tells when to use: when no vault exists. Explicitly says 'Fails if a vault already exists,' which is a clear exclusion condition. Also provides default path and env override. Lacks explicit sibling comparison but context makes it clear.

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