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io.github.PromptPartner/bexio-mcp-server MCP Server

Swiss accounting integration for Bexio. 314 tools: invoices, contacts, projects, account balances

Publisher claimed. No tool list reported, and Pod has not connected to this server.

Status

Pod has not dialled io.github.PromptPartner/bexio-mcp-server yet, so everything on this page is what its publisher reported rather than what we observed. Registries describe servers; they do not connect to them. Until a check runs, treat the tool list below as a claim.

Connect

Published as @promptpartner/bexio-mcp-server on npm. Runs locally.

Known issues

15 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 12.

Most discussed

create_iban_payment produces a standalone payment with no bill link (silently breaks bill reconciliation)

Summary

create_iban_payment creates a standalone banking payment that is not linked to any bill (bill_id is always null). When an agent or user reaches for it to pay a supplier bill — the obvious-sounding choice for "an IBAN payment" — the result silently breaks the normal accounting workflow: the bill stays in status "Offen", its Zahlungen section stays empty, and automatic bank reconciliation can never match the payment to the bill. Nothing in the tool description warn

Read the thread · 2026-06-19 · closed · external user · 1 comment

Orphaned server processes busy-loop at ~100% CPU after client disconnect (stdio)

Summary

When the MCP client disconnects (window close / session restart) without a graceful shutdown, the bexio-mcp-server process does not exit. Instead it appears to busy-loop and pins a full CPU core at ~100%. Orphaned instances accumulate over a work session, each spinning — three were running simultaneously here (~300% CPU total) while completely idle (no requests).

Environment

  • @promptpartner/bexio-mcp-server 2.4.0 (latest on npm)
  • Launched via npx over stdio by

Read the thread · 2026-06-19 · closed · external user · 2 comments

download_file returns entire file as inline base64, overflowing client context

Summary

download_file returns the entire file as an inline base64 string inside the JSON tool result. For anything but tiny files this overflows the MCP client's context window. A 226 KB PDF produced a ~308,000-character result that the client refused to load.

Environment

  • v2.3.0 (unchanged in v2.4.0)

Root cause

src/bexio-client.ts:

async downloadFile(fileId) {
  const response = await axios.get(`.../3.0/files/${fileId}/download`, { responseType: "arraybuffer", ... });

[Read the thread](https://github.com/PromptPartner/bexio-mcp-server/issues/10) · 2026-06-16 · closed · external user · 1 comment

### create_bill / create_outgoing_payment: misleading description and undocumented required fields

## Summary
`create_bill` and `create_outgoing_payment` accept an open `additionalProperties` object whose required structure is undocumented, and `create_bill`'s description is actively misleading. Creating a single bill + payment took ~10 trial-and-error round trips driven only by the API's validation errors.

## Environment
- **v2.3.0** (unchanged in v2.4.0)

## `create_bill`
Description says: *"Bill data including contact_id, title, positions, etc."*
Reality (v4 `purchase/bills`):
- `contact_

[Read the thread](https://github.com/PromptPartner/bexio-mcp-server/issues/9) · 2026-06-16 · closed · external user · 2 comments

### issue_bill and mark_bill_as_paid POST to non-existent v4 endpoints (404)

## Summary
`issue_bill` and `mark_bill_as_paid` always fail with **404 Not Found**. Both POST to action sub-paths that do not exist on the Bexio v4.0 `purchase/bills` API. Consequently a bill created via `create_bill` (which lands in `DRAFT`) **cannot be finalized or marked paid through the MCP at all** — and an outgoing payment cannot be created either, since that requires a non-DRAFT bill.

## Environment
- bexio-mcp-server **v2.3.0** (confirmed still present in v2.4.0 — `src/tools/purchase/` 

[Read the thread](https://github.com/PromptPartner/bexio-mcp-server/issues/6) · 2026-06-16 · closed · external user · 1 comment

### Most recent

### upload_file always fails with HTTP 415 — Bexio's POST /3.0/files requires a bare Accept: application/json header

## Summary

`upload_file` fails for every input with `INTERNAL_ERROR: Request failed with status code 415`. It is not size- or content-related: a 4-byte file fails exactly like a 484 KB PDF.

Root cause: Bexio's `POST /3.0/files` validates the `Accept` header strictly and only accepts the exact value `application/json`. `BexioClient.uploadFile()` sets only the multipart headers from `form-data` plus `Authorization`, so axios' default `Accept: application/json, text/plain, */*` goes out — and Bex

[Read the thread](https://github.com/PromptPartner/bexio-mcp-server/issues/20) · 2026-07-28 · open · external user · 0 comments

### `edit_invoice` always fails: `PUT /kb_invoice/{id}` is not a valid Bexio 2.0 route (edit is `POST`), and the merged payload includes fields the edit form rejects

Every call to the `edit_invoice` tool fails with:

Bexio API error: The form could not be saved due to the following errors:.


regardless of the payload. Three separate problems combine here — the first one is the blocker,
the other two made it undiagnosable / will make it fail again once the first is fixed:

### 1. Wrong HTTP method (blocker)

`editInvoice` sends `PUT /kb_invoice/{id}`, but the Bexio **2.0** API has no PUT route for
`kb_invoice` — the edit operation is `POST /2.0/kb_inv

[Read the thread](https://github.com/PromptPartner/bexio-mcp-server/issues/19) · 2026-07-18 · open · external user · 0 comments

### #11 regression: EPIPE feedback loop in global uncaughtException handler — orphaned stdio server spins at 100% CPU again (v2.4.1)

## Summary

The #11 fix (exit on stdin end/close) works for a *clean* disconnect, but the global `uncaughtException` handler added in v2.4.0 (index.ts, "log, do NOT exit") re-introduces the 100%-CPU orphan through a different path: once stderr's pipe/socket peer is gone, every `logger.error()` call throws `EPIPE`, which lands in the `uncaughtException` handler, which logs it via `logger.error()` to the same dead stderr → next `EPIPE` → self-sustaining loop (~1000 exceptions/sec, one CPU core pin

[Read the thread](https://github.com/PromptPartner/bexio-mcp-server/issues/18) · 2026-07-08 · open · external user · 0 comments

### create_contact / bulk_create_contacts: advertised `address` field is rejected by Bexio (empty 422) — writable fields are street_name / house_number

## Observed (2026-07-03, live company, latest npx build)

Creating a contact with the `address` field the tool schema advertises (`src/tools/contacts/definitions.ts:186`, and `:252` in the bulk variant — `address: { type: "string", description: "Street address" }`) is rejected by Bexio with a **422 whose error list is empty**, which makes the failure very hard to diagnose from the tool result. It cost our agent three failed calls before it found the working shape.

What Bexio actually accepts fo

[Read the thread](https://github.com/PromptPartner/bexio-mcp-server/issues/17) · 2026-07-03 · open · external user · 0 comments

### upload_file: accept a local file path (symmetric to download_file's output_path)

## Context

We drive this server from an agent (Claude Code) that registers receipt PDFs as purchase-bill attachments. Real-world PDFs are hundreds of KB to several MB.

## Problem

`upload_file` accepts file content only as inline base64 (`src/tools/files/handlers.ts:45-47` — params go straight to `client.uploadFile`). Through an LLM tool call that is impractical and corruption-prone: the base64 blob has to pass through the model's context (token cost, hard size ceiling, and any re-tokenization

[Read the thread](https://github.com/PromptPartner/bexio-mcp-server/issues/16) · 2026-07-03 · open · external user · 0 comments

### Optional receipt-gating for irreversible writes (payments / issue·cancel·send invoice / deletes) — one file, zero deps, off by default

Hi — really nice project; the planning docs, tests, and the standalone-payment warning on `create_iban_payment` show you take the dangerous surface seriously. That's exactly why I'm raising this.

A handful of your tools take **irreversible, money-touching actions** that an agent can trigger with no record that an accountable human approved *that specific action*:

- `create_iban_payment`, `create_qr_payment`, `create_outgoing_payment` — move real money
- `issue_invoice`, `cancel_invoice`, `send

[Read the thread](https://github.com/PromptPartner/bexio-mcp-server/issues/15) · 2026-06-30 · open · external user · 0 comments

### update_outgoing_payment always returns 405 (endpoint does not accept PUT)

## Summary
`update_outgoing_payment` always fails with **405 Method Not Allowed**: the v4 `purchase/outgoing-payments/{id}` endpoint does not accept PUT. The tool is therefore non-functional as advertised.

## Environment
- **v2.3.0** (unchanged in v2.4.0)

## Reproduction
1. `create_outgoing_payment(...)` → payment created (`status: "PENDING"`).
2. `update_outgoing_payment({ payment_id, payment_data })`

Actual:

Bexio API error: Request method 'PUT' is not supported. PUT https://api.bexio.c

Read the thread · 2026-06-16 · closed · external user · 1 comment

See all 15 reports Pod holds for io.github.PromptPartner/bexio-mcp-server.

Firsthand observations

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