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Buchhaltungsbutler MCP

by ohneben

Postings: add transaction posting

postings_add_transaction

Add postings to a transaction using accounts, amounts, VAT codes, and optional cost locations.

Instructions

🟡 WRITE · creates data — Creates new records (receipts, transactions, postings, invoices, master data). Not idempotent — calling twice may create duplicates. add transaction posting Add postings for a specified transaction.

Endpoint: POST /postings/add/transaction

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
vatsYesAn array of vats. Usage: "vats" : ['vat of posting 1', 'vat of posting 2']. Possible vats: - 0_none ('keine Ust.') - 19_vat ('19% Ust.') - 7_vat ('7% Ust.') - 19_pre ('19% Vst.') - 7_pre ('7% Vst.') - 19_both_1 ('§13b 19% USt./VSt.') - 19_both_2 ('I.g.E. 19% USt./VSt.') - 7_both ('I.g.E. 7% USt./VSt.') - 19_both_1_no_pre ('§13b 19/16% USt.') - 19_both_2_no_pre ('i.g.E. 19/16% USt.') - 7_both_no_pre ('i.g.E. 7/5% USt.') - 19_pre_app ('19/16% Aufz. VSt.') - 7_pre_app ('7/5% Aufz. VSt.') - 19_both_app_1 ('§13b 19/16% USt./Aufz. VSt.') - 19_both_app_2 ('i.g.E. 19/16% USt./Aufz. VSt.') - 7_both_app ('i.g.E. 7/5% USt./Aufz. VSt.')
amountsYesAn array of amounts. Usage: "amounts" : ['amount of posting 1', 'amount of posting 2'] Amount must be in format 0000.00
api_keyNoOptional. The BB customer api_key to act on. Defaults to the BB_API_KEY configured on the server — only set this to target a different customer.
postingtextsYesAn array of posting texts. Usage: "postingtexts" : ['text of posting 1', 'text of posting 2']
cost_locationsNoAn array of cost_locations. Usage: "cost_locations" : ['cost_location of posting 1', 'cost_location of posting 2']. If specified, the field will be validated.
postingaccountsYesAn array of postingaccount numbers. Usage: "postingaccounts" : ['number of posting 1', 'number of posting 2']
cost_locations_twoNoAn array of cost_locations_two. Usage: "cost_locations_two" : ['cost_location_two of posting 1', 'cost_location_two of posting 2']. If specified, the field will be validated.
transaction_id_by_customerYesThe id_by_customer of the transaction.
oi_receipts_ids_by_customerYesAn array of "open item" receipts ids_by_customer . Usage: "oi_receipts_ids_by_customer" : ['id_by_customer of the receipt for posting 1', null ] The receipts specified will be assigned directly to the respective postings. A null value within the array means explicitly assigning no receipt to the partial posting in that position. IMPORTANT: The field is only required, if OI postings are activated in customers account.
Behavior4/5

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

Description labels the tool as a WRITE operation and explicitly states it is not idempotent, which aligns with annotations (readOnlyHint=false, idempotentHint=false) and adds context beyond annotations.

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?

Description is concise at three lines, with a clear header and action statement. The generic header line could be more tailored, but overall efficient.

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

Completeness3/5

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

No output schema is provided, and the description does not explain return values or what the tool outputs upon success. For a creation tool with 9 parameters, complete guidance would include the response format.

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?

Input schema has 100% description coverage, so parameters are already well-documented. The description adds no new semantic information beyond the schema, meeting baseline expectations.

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?

Title and description clearly state 'add postings for a specified transaction', distinguishing it from siblings like 'postings_add_free' or 'postings_add_receipt' by specifying the transaction context.

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

Usage Guidelines4/5

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

Description warns about non-idempotency ('calling twice may create duplicates'), implying cautious use. However, it does not explicitly state when to use this tool versus alternatives, though context hints from sibling names.

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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