list_categories

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

With no annotations provided, the description carries the full burden. It discloses the hierarchy structure and the sync prerequisite, which is useful. However, it does not explicitly state read-only behavior or potential outcomes if sync is not performed, leaving some behavioral ambiguity.

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 a single, information-dense sentence. It is front-loaded with the core purpose ('List all expense/income categories') and includes only essential additional context (hierarchy and sync prerequisite). No wasted words.

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?

Given the simplicity of the tool (0 parameters, no output schema), the description adequately covers purpose, scope, and a key prerequisite. It does not describe the return format, but for a straightforward list tool this is a minor omission and the description is otherwise complete.

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?

The tool has 0 parameters, so the empty schema is fully described (100% coverage). The description adds contextual meaning by specifying what the listing includes (expense/income categories and hierarchy), which exceeds the baseline for parameterless tools.

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 clearly states the tool lists all expense/income categories (tags) with hierarchy, distinguishing it from sibling list tools like list_accounts and list_merchants. The verb 'list' and specific resource 'categories' make the purpose unambiguous.

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 description provides clear context by stating 'Sync must be done first,' implying the tool should be used after synchronization. It does not explicitly name alternative tools or when-not-to-use conditions, but the prerequisite offers practical guidance for correct usage.

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