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akutishevsky

LunchMoney MCP Server

create_transactions

Insert one or more financial transactions into LunchMoney. Supports up to 500 transactions per call with automatic duplicate detection.

Instructions

Insert one or more transactions (1-500 per call). Returns inserted transactions plus any skipped duplicates.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
transactionsYesArray of transactions to insert (1-500).
apply_rulesNoApply rules associated with the transaction's manual_account_id.
skip_duplicatesNoFlag transactions that match an existing transaction's date+payee+amount+account as duplicates and skip them. Note: external_id deduplication always runs regardless of this flag.
skip_balance_updateNoIf true, do not update the manual account's balance when inserting these transactions.
Behavior3/5

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

The description mentions the batch limit and return value (inserted plus skipped duplicates), which adds some context. However, it does not disclose behavior on partial failures, auth requirements, or rate limits. The annotation idempotentHint=false is consistent with a mutation operation, and there is no contradiction.

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?

The description is a single, front-loaded sentence that conveys the core purpose (insert transactions), the batch limit (1-500), and the outcome (returns inserted and skipped duplicates). No wasted words.

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?

Given the complexity of the tool (4 parameters, no output schema), the description covers the essential batch and dedup behavior. It does not explain the return format or error handling, but for a creation tool, this is reasonably complete. The lack of output schema is partially mitigated by the input schema structure.

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 description coverage is 100%, so the input schema already thoroughly documents all parameters. The description adds minimal additional meaning beyond summarizing the batch size and return value, which is already present in the schema (minItems/maxItems). Baseline of 3 is appropriate.

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?

Description clearly states the action (insert), the resource (transactions), and the scope (1-500 per call). This distinguishes it from sibling tools like get_transactions (read) and delete_transactions_bulk (delete).

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?

The description implies usage for inserting transactions but does not explicitly mention when to use this tool versus alternatives such as create_transaction_group or attach_file_to_transaction. No exclusions or prerequisites are provided.

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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