Postly
io.github.gustavmakes/postlygustavmakesstreamable-httpv1.0.0Scanned
Send printed letters to Danish addresses: regular or registered mail, printed and posted for you.
7 tools: 2 do something that can't be undone and 5 only read.
- Reads private data · 0
- Reads text others write · 2
- Can send data out · 2
- No findings
Anlyon alternative
2 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.
Import an OpenAPI spec →Tools
Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.
7 tools
Can't be undone 2Claude Code: ask
create_letter_orderOpretter et fysisk tekstbrev i Danmark og returnerer et betalingslink.Reads text others writeCan send data outNo findings
Why it is in this group
- The name "create_letter_order" says "create": a word for a change.
- The input addresses people (input.recipient): what it sends cannot be taken back.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
- outboundThe input takes a destination (input.recipient): what the tool writes goes there.
Description, as the server wrote it Opretter et fysisk tekstbrev i Danmark og returnerer et betalingslink. Brugeren skal selv åbne linket og betale; brevet sendes først, når betalingen er gennemført. Kræver ingen API-nøgle. Bekræft altid modtagerens adresse og prisen med brugeren først.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- openWorldHint: true
send_letterSender et fysisk brev i Danmark.Reads text others writeCan send data outNo findings
Why it is in this group
- The name "send_letter" says "send": a word for sending, and what is sent cannot be taken back.
- The input addresses people (input.recipient): what it sends cannot be taken back.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
- outboundThe name "send_letter" says "send": it sends or publishes something to other people.
- outboundThe input takes a destination (input.recipient): what the tool writes goes there.
Description, as the server wrote it Sender et fysisk brev i Danmark. Beløbet trækkes fra den forudbetalte saldo, og brevet kan ikke annulleres efter afsendelse.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- openWorldHint: true
Only reads 5Show 5 read-only tools
get_balanceViser den forudbetalte saldo og kontostatus for den tilknyttede API-kunde.No findings
Why it is in this group
- The name "get_balance" says "get": a word for reading.
Description, as the server wrote it Viser den forudbetalte saldo og kontostatus for den tilknyttede API-kunde.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false
get_letter_statusViser status for et tidligere sendt brev ud fra dets id.No findings
Why it is in this group
- The name "get_letter_status" says "get": a word for reading.
Description, as the server wrote it Viser status for et tidligere sendt brev ud fra dets id.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false
get_order_statusViser status for en ordre oprettet med create_letter_order, fx om den er betalt eller afsendt.No findings
Why it is in this group
- The name "get_order_status" says "get": a word for reading.
Description, as the server wrote it Viser status for en ordre oprettet med create_letter_order, fx om den er betalt eller afsendt.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false
get_pricingHenter Postlys aktuelle priser for almindelige og rekommanderede breve.No findings
Why it is in this group
- The name "get_pricing" says "get": a word for reading.
Description, as the server wrote it Henter Postlys aktuelle priser for almindelige og rekommanderede breve.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false
list_lettersLister de seneste breve sendt af denne konto.No findings
Why it is in this group
- The name "list_letters" says "list": a word for reading.
Description, as the server wrote it Lister de seneste breve sendt af denne konto.
Annotations the server declares
- readOnlyHint: 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.
No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data.
- Reads private data0
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write2
- Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
- Can send data out2
- Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.
Findings
Matches of fixed checks, with the text they matched.
No check matched anything in these tool definitions. That is not a safety guarantee.
History
Changes to its tool definitions and to its remote endpoint, newest first.
No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.
Install
Pinned to version 1.0.0. Values in angle brackets are yours to fill in.
claude mcp add --transport http postly https://postly.dk/api/public/v1/mcpclaude mcp add --transport http postly https://postly.dk/api/public/v1/mcpRun 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.
{
"permissions": {
"allow": [
"mcp__postly__get_pricing",
"mcp__postly__get_balance",
"mcp__postly__get_letter_status",
"mcp__postly__list_letters",
"mcp__postly__get_order_status"
],
"ask": [
"mcp__postly__send_letter",
"mcp__postly__create_letter_order"
],
"deny": []
}
}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 postly. Review it before you use it.
Capability tags behind 2 rules
- mcp__postly__send_letter untrusted-input, outbound
- mcp__postly__create_letter_order untrusted-input, outbound
Pin
Keep the decision: fail CI when the tools change, follow every change, or show a badge.
Pin in CI
Fail a build when the tools you reviewed are not the tools the server serves today.
curl -s "https://anlyon.dev/api/v1/servers/io.github.gustavmakes/postly/verify?hash=c188401f073bac906136fc698b24cbfc71d2548b237073e9b80759404797c14f" | jq -e '.changed == false'Pinned hash c188401f073b, from Nov 4, 2026, 16:18 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/io.github.gustavmakes/postly/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
Badge
[](https://anlyon.dev/servers/io.github.gustavmakes/postly)Source: MCP Registry. Synced Nov 4, 2026, 16:17 UTC.