YNAB MCP Server

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

With no annotations provided, the description carries full burden for behavioral disclosure. While it correctly identifies this as a destructive operation ('Delete'), it doesn't mention permission requirements, whether deletion is permanent/reversible, rate limits, or what happens to associated data. The return statement is vague ('Confirmation of deletion').

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 efficiently structured with a clear purpose statement followed by Args and Returns sections. Every sentence serves a purpose with zero wasted words, making it easy to parse quickly.

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 destructive operation with no annotations, the description is minimally adequate but incomplete. It identifies the tool as a deletion operation and documents parameters, but lacks crucial behavioral context about permissions, permanence, and side effects. The existence of an output schema somewhat mitigates the need to detail return values.

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?

With 0% schema description coverage, the description compensates well by explaining both parameters: 'transaction_id' as 'The transaction UUID to delete' and 'budget_id' as 'Budget ID (uses default if omitted)'. This adds meaningful context beyond the bare schema, though it could specify format expectations for UUIDs.

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 action ('Delete') and resource ('a transaction'), making the purpose immediately understandable. However, it doesn't differentiate this tool from sibling tools like 'update_transaction' or 'get_transactions' beyond the obvious verb difference.

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 like 'update_transaction' or 'create_transaction'. It doesn't mention prerequisites, consequences, or scenarios where deletion is appropriate versus modification.

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