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alexfu

mcp-ynab

by alexfu

createScheduledTransaction

Create a future-dated scheduled transaction in your YNAB budget, specifying account, date, amount, frequency, and optional payee or category.

Instructions

Creates a single scheduled transaction (a transaction with a future date).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
plan_idYesThe id of the plan. "last-used" can be used to specify the last used plan and "default" can be used if default plan selection is enabled (see: https://api.ynab.com/#oauth-default-plan).
scheduled_transactionYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
dataYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.7/5.0
Behavior2/5

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

With no annotations, the description must carry the full burden of behavioral disclosure. It only clarifies that the date is in the future, which is redundant with the schema. It omits any mention of permissions, idempotency, response behavior, or side effects, which is critical for a create operation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single concise sentence with no filler, and it front-loads the core purpose. It is efficient, though arguably too sparse given the tool's complexity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a create operation with a nested object and an output schema, the description lacks essential behavioral context such as error handling, validation rules, or how it relates to other scheduled transaction tools. It is minimally sufficient but leaves the agent without guidance on important operational aspects.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 50%, so the description should compensate for undocumented parameters. It adds no parameter-specific information and does not clarify the nested scheduled_transaction object structure or the meaning of required fields beyond what the schema already states. The 'future date' clarification is redundant with the schema description.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'creates' and the resource 'scheduled transaction', and adds a clarifying parenthetical that it is a transaction with a future date. This differentiates it from regular transaction creation tools like createTransaction, though it could be more specific about the scheduling aspect.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives such as updateScheduledTransaction or deleteScheduledTransaction. There is no mention of typical use cases, prerequisites, or conditions that would make this the preferred choice.

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