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Invoice by Ouroboros Apps MCP server

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by LAHutchins91·io.github.LAHutchins91/invoice·v1.0.3
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Freelance invoice line items, rates, due dates, and late terms for AI assistants

B81/100grade B
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Invoice by Ouroboros Apps tools (13, 1 write)

write = sends, deletes, buys or posts
  • accept_invoice_changeFree

    Apply one suggested invoice change after the freelancer explicitly approves that change. Pass confirmed true only then. This is the path that may add a line, change a rate, apply a discount, or move the due date. Calling it is not a substitute for the freelancer's approval.

  • begin_invoiceFree

    Start a draft invoice. Draft figures are not an approved commitment until seal_invoice. Currency is a three-letter code. Amounts later are minor units of that currency and are the freelancer's figures.

  • describe_lineFree

    Correct a line description while the invoice is still a draft. After approval, a different description is refused. Use suggest_invoice_change with add_line for a different line.

  • list_invoicesFree

    List the signed-in freelancer's invoices. Use a returned id with read_invoice. Do not guess an invoice.

  • offer_discountFree

    Record a discount the freelancer is putting on the invoice. kind none uses value 0. kind percent takes a whole number from 1 to 100. kind fixed takes a whole number of minor units. After the invoice is sealed, a different discount is refused until accept_invoice_change applies an apply_discount suggestion. Do not invent a discount.

  • place_lineFree

    Add one line: description, quantity, rate in whole minor units, and unit hour, each, or day. After the invoice is sealed, a new line is refused until accept_invoice_change applies an add_line suggestion.

  • quote_line_rateFree

    Set the rate already chosen for one line, as a whole number of minor units in the invoice currency. After the invoice is sealed, a different rate is refused until accept_invoice_change applies a change_rate suggestion.

  • read_invoiceFree

    Read the invoice before answering. Quote only this record. Draft status is not an approved commitment. Proposed changes do not authorize a new line, a different rate, a discount, or a new due date.

  • seal_invoiceFree

    Mark the current draft as the approved invoice. Pass confirmed true only after the freelancer explicitly approves the lines, quantities, rates, due date, late terms, and any discount already on the draft.

  • set_invoice_dueFree

    Set the due date as a calendar day in YYYY-MM-DD form. After the invoice is sealed, a different date is refused until accept_invoice_change applies a move_due_date suggestion.

  • set_line_quantityFree

    Set the quantity on one line. After the invoice is sealed, a different quantity is refused until accept_invoice_change applies an adjust_quantity suggestion.

  • suggest_invoice_changeFree

    Record a suggested change. This does not change the invoice. kind add_line requires description, quantity, rateMinor, and unit. kind change_rate requires lineId and rateMinor. kind apply_discount requires discountKind, discountValue, and discountNote. kind move_due_date requires dueOn. kind adjust_quantity requires lineId and quantity. kind revise_late_terms requires graceDays, lateBasis, feeMinor, latePercent, and lateNote.

  • write_late_termswrite actionFree

    Record late terms: grace days, and a basis of none, flat_fee, or percent_per_period. flat_fee uses feeMinor and a percent of 0. percent_per_period uses percent and a fee of 0. After approval, a different basis, grace, fee, or percent is refused until an accepted revise_late_terms suggestion.

Public scan report

scanner v0.1.10 · 2026-10-09 · same rubric, same numbers if you re-run it

1 high
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 765ms20/20
  • Tool poisoning13 tool descriptions checked15/15
  • Auth qualityopen endpoint exposes 1 write-action tools with no auth3/15
  • Maintenancelast push 1 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Findings (1)

  • highWrite-action tools reachable without authenticationauth.open-write
Overall 81/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Invoice by Ouroboros Apps compares

Against every graded Finance MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
81/100
higher than 70% of 1,761 Finance servers
Tools
13
the typical Finance server has 8
Tools that change things
8%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote Finance server answers 100%
Response time
163 ms
faster than 72% of 1,133 Finance servers

What its tools let an agent do: 10 read · 1 create · 2 change

Install Invoice by Ouroboros Apps in Claude Code, Cursor or VS Code

claude mcp add --transport http invoice https://invoice-continuity2.vercel.app/mcp
Add to Cursor

What the publisher says

From the Invoice by Ouroboros Apps repository's README, as published. We do not edit it. Read it on GitHub

Invoice

Invoice keeps a freelancer's approved invoice — line items, quantities, the rate already approved, the due date, and late terms — then lets an assistant read that record before it answers. An assistant cannot add a line, change a rate, invent a discount, or move a due date unless that change is explicitly approved.

It works with ChatGPT, Claude, Gemini, Grok, and Cursor, plus any other MCP client that can do Streamable HTTP and OAuth. It is not a ChatGPT-only plugin.

Sign in with your Invoice account when the assistant opens OAuth. Do not paste an API key or password into a header. Invoice supports dynamic client registration: leave the client id and secret empty. The protected-resource metadata at /.well-known/oauth-protected-resource/mcp points clients at the OAuth issuer, which registers them.

Invoice tools need Pro or an active trial. A new subscription includes a 14-day trial. This page does not list a price. Checkout shows the billing interval and payment terms. Amounts stored on an invoice are the freelancer's approved figures, in whole minor units of the invoice currency. They are not a product price.

To self-host, run the server and use the base URL you configure. The default MCP address is http://127.0.0.1:3000/mcp.

Hosted server

  • MCP server URL: https://invoice-continuity2.vercel.app/mcp (Streamable HTTP, OAuth sign-in)
  • Docs: https://ouroborosapps.com/docs/invoice
  • Status: early access. Paste the URL into Claude, Cursor, Grok, or ChatGPT developer mode.
  • Registry name: io.github.LAHutchins91/invoice

What the assistant can do

After you approve the connection, the server exposes these tools:

  • list_invoices
  • begin_invoice
  • read_invoice
  • place_line
  • describe_line
  • quotelinerate
  • setlinequantity
  • setinvoicedue
  • writelateterms
  • offer_discount
  • seal_invoice
  • suggestinvoicechange

readinvoice is the read the assistant should do before it answers. Draft figures are not an approved commitment. A suggested invoice change does not change the record. After the invoice is sealed, placeline refuses a new line, quotelinerate refuses a changed rate, offerdiscount refuses a discount, and setinvoicedue refuses a moved due date. Those changes go through suggestinvoicechange and then acceptinvoice_change, and only when you explicitly approve that change.

The assistant only calls these tools when you and the host allow it.

Connect

Cursor, in ~/.cursor/mcp.json or a project .cursor/mcp.json:

{
  "mcpServers": {
    "invoice": {
      "url": "http://127.0.0.1:3000/mcp"
    }
  }
}

Do not add a headers block. Cursor registers a client and opens sign-in.

Claude Code:

claude mcp add --transport http invoice http://127.0.0.1:3000/mcp

Do not pass an Authorization header. Other clients use the same address, choose OAuth, and leave client id and secret empty. Steps for ChatGPT, Claude, Gemini, Grok, and Cursor are on the connect page at /connect.

Registry metadata for this server is in server.json (io.github.LAHutchins91/invoice). The remote URL there is https://invoice-continuity2.vercel.app/mcp.

Run

npm install
npm test
npm run typecheck
npm run build
npm start

When stdin is a terminal, Invoice serves Streamable HTTP on port 3000. When stdin is not a terminal, it speaks MCP over stdio and still opens the HTTP port. Logs during stdio mode go to stderr so they do not mix with the protocol.

Records are stored durably in a JSON file. The default path is ~/.invoice/invoice.json. Set INVOICEDATAPATH to move it. One server process owns that file. Do not point it at another product's data file.

OAuth uses the same idea as a Supabase authorization server with dynamic client registration. Set these on the server process, not in an MCP header:

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Invoice by Ouroboros Apps: common questions

Is Invoice by Ouroboros Apps MCP server safe?
Mostly: it is graded B (81/100). Read the Invoice by Ouroboros Apps safety report
How do I install Invoice by Ouroboros Apps?
It runs remotely at invoice-continuity2.vercel.app. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Invoice by Ouroboros Apps need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Invoice by Ouroboros Apps maintained?
The last commit was 26 days ago (2026-10-08). The latest release is v1.0.3.
Is Invoice by Ouroboros Apps up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Invoice by Ouroboros Apps?
Servers from other publishers that do the same job: Quickbooks MCP server, three.ws Tutor MCP server and Kronos MCP server.
How does Invoice by Ouroboros Apps compare with other Finance MCP servers?
safety score 81/100 (higher than 70% of 1,761 Finance servers); tools 13 (the typical Finance server has 8); tools that change things 8% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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