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

With no annotations, the description carries the full disclosure burden, and it does add one genuine behavioral fact: the token is cached locally, which tells the agent repeated calls may be unnecessary. However it says nothing about token lifetime, what happens on invalid credentials, or where/how the cache is stored or invalidated.

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 efficient sentence with the outcome front-loaded and the caching detail parenthesized where it belongs. Nothing is wasted, though the sentence is short enough that it could have afforded one more clause on credential failure behavior.

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 two-field authentication tool with no output schema, the definition covers what it returns (a JWT) and that it is cached, which is the core contract. It stops short of covering error behavior, token expiry, or whether the returned token must be supplied to sibling tools, which an agent would benefit from knowing.

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 0%, so the description ideally would explain the parameters, but it only says 'Money Lover credentials', which at least identifies the account domain. The two parameters (email, password) are self-explanatory by name and both required, so the practical gap is small, though no format or validation guidance is offered.

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 (authenticate) and a specific outcome (retrieve a JWT token), so the agent immediately knows this is the credential-exchange step rather than a data query. It does not explicitly name how it relates to siblings like get_user_info or get_wallets, but the auth framing makes its distinct role obvious.

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: the '(cached locally)' note hints the token is reused, suggesting this is a prerequisite call before the other account tools, but it never says 'call this first' or when not to call it. There is no mention of what to do if a token already exists.

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