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akutishevsky

LunchMoney MCP Server

create_category

Create a new category or category group for transactions, with options to set income treatment, budget exclusions, and assignment to existing groups.

Instructions

Create a new category or a category group. Set is_group=true to create a category group; supply children as an array of existing category IDs and/or strings (names of new sub-categories to create).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYesName of the category. 1-100 characters.
descriptionNoOptional description. Up to 200 characters.
is_incomeNoWhether transactions in this category should be treated as income.
exclude_from_budgetNoWhether transactions in this category should be excluded from budgets.
exclude_from_totalsNoWhether transactions in this category should be excluded from calculated totals.
archivedNoWhether the category should be archived.
is_groupNoIf true, creates a category group instead of a category. When true, group_id may not be set; use children to assign existing categories.
group_idNoIf set, assigns the new category to an existing category group. Cannot be set if is_group is true.
childrenNoOnly valid when is_group is true. Array of existing category IDs (numbers) and/or names of new sub-categories to create (strings).
Behavior4/5

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

Adds context about dual behavior (category vs group) and children array handling, supplementing the idempotentHint=false annotation. Lacks mention of duplicate handling or return value, but adequate for a creation tool.

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

Conciseness5/5

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

Two concise sentences front-loaded with main purpose. No redundant information; every word adds value.

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

Completeness4/5

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

Covers core creation logic including group variation. Missing return value description (no output schema). Other parameters are well-documented in schema, so overall complete for common use cases.

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

Parameters3/5

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

Schema coverage is 100% with detailed parameter descriptions. The description reiterates is_group and children semantics which are already in the schema, adding minimal new meaning beyond summarizing.

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

Purpose5/5

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

Clear verb 'Create' with specific resource 'category or a category group', distinctly separating two modes using is_group. Among siblings, this tool is uniquely for creating categories, differentiating from create_tag or create_transaction_group.

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

Usage Guidelines3/5

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

Implies usage for creating categories/groups but no explicit guidance on when to use this vs update_category or when not to use. No exclusions or alternative tools mentioned.

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

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