Create transaction category

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

The annotations already signal that this is a write operation (readOnlyHint=false) and non-destructive. However, the description does not add any behavioral context beyond the bare fact of creation—no mention of permissions, duplicate handling, or what happens if the referenced group does not exist. With annotations present, the bar is lower, but no extra context is provided.

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, tight sentence with no redundant words. It states the core purpose immediately and nothing else, which is appropriate for such a simple tool.

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 tool with five parameters and two required ones, the description is underpowered. It does not mention that group_id must reference an existing group, how to obtain valid group IDs, or any constraints among optional parameters. Although an output schema exists, the lack of parameter semantics and usage guidance makes this inadequate for confident invocation.

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 only 20% (only rollover_start_month has a description), and the tool description itself explains none of the five parameters. It does not clarify relationships like rollover_enabled requiring rollover_start_month, nor what icon expects. The description completely fails to compensate for the low schema coverage.

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 uses a specific verb ('Create') and identifies the resource ('category') and its placement ('in an existing category group'), making it clear what the tool does. It is distinct from sibling tools like delete_transaction_category or create_transaction_tag, though it could be slightly clearer that the category is a transaction-specific category.

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 no guidance on when to use this tool versus alternatives, nor does it mention any prerequisites or exclusions. It implies that a category group must already exist, but does not state this explicitly or point to related tools like get_transaction_category_groups.

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