Set when your owner is pinged about low balance

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

The description adds useful behavioral context beyond the annotations: it says the tool returns the full preferences and requires GLONGUS_API_KEY. The annotations already declare it is not read-only, not destructive, and not open-world, so the remaining disclosure gap is minor.

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 description is three short sentences, front-loads the core action, and includes only relevant details: threshold meaning, return value, and authentication requirement.

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 one-parameter mutation with annotations and no output schema, the description covers the action, return value, and auth requirement. However, the pence-versus-cents inconsistency leaves a meaningful ambiguity about the input value that should be resolved in the description or schema.

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 must carry the parameter meaning. It explains that the value is the wallet balance below which an alert fires, but it says '(pence)' while the parameter is named low_balance_threshold_cents, creating a unit ambiguity that could lead to incorrect invocation.

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 and resource: setting the wallet balance threshold below which the owner gets a low-balance alert. It also clarifies this is the only preference the caller may set themselves, distinguishing it from broader preference/profile tools in the sibling list.

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 implied: use this tool to set the low-balance alert threshold. The phrase 'the one preference you may set yourself' hints at scope relative to other preference tools, but it does not explicitly name alternatives or state when not to use this tool.

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