io.github.theluckystrike/credit-note

by theluckystrike · remote · local (mcpb) · no sign-in to list tools · v0.22.8 · published by GitHub user theluckystrike

Credit notes against an invoice or standalone: drafts, finalization, rendering, totals.

Deletes · 1Final · 4Changes · 4

Compare Registry entry

10 tools: 1 can delete or cancel things, 4 do something that can't be undone, 4 change things and 1 only read.

Scanned Oct 21, 2026

Deletes or cancels1Claude Code: deny: see these tools
Can't be undone4Claude Code: ask: see these tools
Changes things4Claude Code: ask: see these tools
Only reads1Claude Code: allow: see these tools

2 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http credit-note https://mcp.zovo.one/mcp/credit-note-ics --header 'Authorization: <your-authorization>'

Findings

Matches of fixed checks, with the text they matched.

2 warn

Warncredit_note_list
The server marks "credit_note_list" as not read-only (readOnlyHint: false), and its words say it reads.
Matched text
annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false}; The name "credit_note_list" says "list": a word for reading.
What this check looks for
Warncredit_note_get
The server marks "credit_note_get" as not read-only (readOnlyHint: false), and its words say it reads.
Matched text
annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false}; The name "credit_note_get" says "get": a word for reading.
What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

10 tools

Deletes or cancels 1Removes, cancels or revokes something.Claude Code: deny

credit_note_deleteDelete a draft credit note entered wrongly, by its draft id.No findings
Why it is in this group
- The name "credit_note_delete" says "delete": a word for removing or ending something.
- The server marks it destructive (destructiveHint: true).
Description, as the server wrote it
Delete a draft credit note entered wrongly, by its draft id. A finalized note is refused by name: it is a document the client may have seen, and deleting it would leave their copy pointing at nothing.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: true
- idempotentHint: false
- openWorldHint: false

Can't be undone 4Sends, pays, publishes or merges: once done, it cannot be taken back.Claude Code: ask

credit_note_createIssue a credit note against an invoice, or standalone: the recipient, the reason (returned goods, overcharge, discount correction, service issue, other), line items with quantity, …Can send data outNo findings
Why it is in this group
- The name "credit_note_create" says "create": a word for a change.
- The input addresses people (input.recipient): what it sends cannot be taken back.
What it can reach
- outboundThe input takes a destination (input.recipient): what the tool writes goes there.
Description, as the server wrote it
Issue a credit note against an invoice, or standalone: the recipient, the reason (returned goods, overcharge, discount correction, service issue, other), line items with quantity, unit price and tax rate, and the currency. Returns a draft you can still revise; credit_note_finalize burns the final CN number.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false
credit_note_finalizeFinalize a draft: burn the final CN-YYYY-NNNN number and freeze the note.No findings
Why it is in this group
- The name "credit_note_finalize" says "finalize": a word for a change that another call does not undo.
Description, as the server wrote it
Finalize a draft: burn the final CN-YYYY-NNNN number and freeze the note. From here it cannot be edited or deleted, only rendered and listed, because it is now the document the client sees. Free tier: 10 finalized credit notes; Pro removes the limit.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false
credit_note_summaryHow much you have credited: totals per currency over finalized credit notes, broken down by reason and by month, in an optional issue-date period.Can send data outNo findings
Why it is in this group
- The input addresses people (input.to): what it sends cannot be taken back.
What it can reach
- outboundThe input takes a destination (input.to): what the tool writes goes there.
Description, as the server wrote it
How much you have credited: totals per currency over finalized credit notes, broken down by reason and by month, in an optional issue-date period. Drafts count for nothing until they are finalized. Currencies are never added together.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false
credit_note_updateChange a draft credit note while it is still a draft: recipient, reason, lines, currency, invoice reference, issue date or notes.Can send data outNo findings
Why it is in this group
- The name "credit_note_update" says "update": a word for a change.
- The input addresses people (input.recipient): what it sends cannot be taken back.
What it can reach
- outboundThe input takes a destination (input.recipient): what the tool writes goes there.
Description, as the server wrote it
Change a draft credit note while it is still a draft: recipient, reason, lines, currency, invoice reference, issue date or notes. Pass only what changes; new lines replace all old ones. A finalized note is immutable and is refused by name.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false

Changes things 4Creates or changes something that can be changed back.Claude Code: ask

credit_note_getReturn one credit note by its CN number or draft id: every line with quantity, unit price and tax, the totals per tax rate, the reason, the invoice it credits, and the notes.Reads private data1 finding
Why it is in this group
- The name "credit_note_get" says "get": a word for reading.
- The server marks it as not read-only (readOnlyHint: false).
What it can reach
- private-dataThe name "credit_note_get" says "get" and "note": it reads notes.
- private-dataThe description's first sentence says "return" and "note": it reads notes.
Findings
- Warn
  The server marks "credit_note_get" as not read-only (readOnlyHint: false), and its words say it reads.
  Matched text
  annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false}; The name "credit_note_get" says "get": a word for reading.
  What this check looks for
Description, as the server wrote it
Return one credit note by its CN number or draft id: every line with quantity, unit price and tax, the totals per tax rate, the reason, the invoice it credits, and the notes. Reads only; use credit_note_list for the ids.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false
credit_note_listList credit notes: number or draft id, recipient, reason, status, issue date and total.Reads private dataReads text others writeCan send data out1 finding
Why it is in this group
- The name "credit_note_list" says "list": a word for reading.
- The server marks it as not read-only (readOnlyHint: false).
What it can reach
- private-dataThe name "credit_note_list" says "list" and "note": it reads notes.
- private-dataThe description's first sentence says "list" and "note": it reads notes.
- untrusted-inputThe description's first sentence says "list" and "issue": it reads issues, which other people can write.
- outboundThe input takes a destination (input.recipient): what the tool writes goes there.
Findings
- Warn
  The server marks "credit_note_list" as not read-only (readOnlyHint: false), and its words say it reads.
  Matched text
  annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false}; The name "credit_note_list" says "list": a word for reading.
  What this check looks for
Description, as the server wrote it
List credit notes: number or draft id, recipient, reason, status, issue date and total. Filter by recipient (a part of the name is enough), by reason, by status draft or final, and by issue-date period with from and to.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false
credit_note_renderTurn a credit note into the document: Markdown to paste into an email or ticket, or a self-contained printable HTML page with every style inline.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
Turn a credit note into the document: Markdown to paste into an email or ticket, or a self-contained printable HTML page with every style inline. Drafts render with a DRAFT banner so a half-finished credit cannot be sent by mistake. Writes nothing. Free; the free tier stamps a one-line footer.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false
license_activateTurn Pro on for this connection with key, an MCPL1.<payload>.<signature> issued at checkout for this server or the bundle.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
Turn Pro on for this connection with key, an MCPL1.<payload>.<signature> issued at checkout for this server or the bundle. Data under your token stays; a wrong or expired key changes nothing. license_status confirms it.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false

Only reads 1Looks things up and changes nothing.Claude Code: allow

license_statusReport this endpoint's licence state for your token as JSON: the product, the tier free or pro, why it is not Pro, and the checkout URL.Reads text others writeNo findings
Why it is in this group
- The name "license_status" says "status": a word for reading.
What it can reach
- untrusted-inputThe description's first sentence says "url": it reads web pages, which anyone can write.
Description, as the server wrote it
Report this endpoint's licence state for your token as JSON: the product, the tier free or pro, why it is not Pro, and the checkout URL. Call it to explain a free-tier refusal. No arguments, nothing changes.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

16 paths in this server alone from private data, through text someone else wrote, to a way out. Denying 2 untrusted-input tools breaks every one.

Reads private data2: Reads files, mail, messages, databases, secrets, calendars or repositories.; credit_note_get
credit_note_list
Reads text others write2: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; credit_note_list
license_status
Can send data out4: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.; credit_note_create
credit_note_list
credit_note_summary
credit_note_update

deny to break every path

{
  "permissions": {
    "deny": [
      "mcp__credit-note__credit_note_list",
      "mcp__credit-note__license_status"
    ]
  }
}

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Looked at Oct 22, 2026, 15:24 UTC, unchanged since Oct 22, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 9
Protocol version: 2025-06-18
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: none
RFC 9728 protected resource metadata: https://mcp.zovo.one/.well-known/oauth-protected-resource
Authorization servers: https://mcp.zovo.one
Legacy HTTP+SSE transport: no
Dynamic client registration: yes
Client ID metadata documents: no

HighThe whole server
The endpoint served tools/list without credentials, and the list has 9 tools that change things (1 destructive, 4 irreversible, 4 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://mcp.zovo.one/mcp/credit-note-ics: tools/list returned 10 tools to an anonymous client, including credit_note_delete (destructive), credit_note_create (irreversible), credit_note_update (irreversible), credit_note_finalize (irreversible), credit_note_summary (irreversible) and 4 more
What this check looks for

Install

Pinned to version 0.22.8. Values in angle brackets are yours to fill in.

claude mcp add --transport http credit-note https://mcp.zovo.one/mcp/credit-note-ics --header 'Authorization: <your-authorization>'

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__credit-note__license_status"
    ],
    "ask": [
      "mcp__credit-note__credit_note_create",
      "mcp__credit-note__credit_note_update",
      "mcp__credit-note__credit_note_finalize",
      "mcp__credit-note__credit_note_list",
      "mcp__credit-note__credit_note_get",
      "mcp__credit-note__credit_note_render",
      "mcp__credit-note__credit_note_summary",
      "mcp__credit-note__license_activate"
    ],
    "deny": [
      "mcp__credit-note__credit_note_delete"
    ]
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as credit-note. Review it before you use it.

Capability tags behind 6 rules

mcp__credit-note__credit_note_create outbound
mcp__credit-note__credit_note_update outbound
mcp__credit-note__credit_note_list private-data, untrusted-input, outbound
mcp__credit-note__credit_note_get private-data
mcp__credit-note__credit_note_summary outbound
mcp__credit-note__license_status untrusted-input

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.theluckystrike/credit-note/changes.xml

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Anlyon alternative

9 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

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Source: MCP Registry · repository. Synced Oct 21, 2026, 18:50 UTC.

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