Skip to content
Magic Envelope logo

Magic Envelope MCP server

Which MCP servers are Magic Envelope's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-24

← Back to Magic Envelope

Whose server it is
  • Registry namecom.magic-envelope/invitationsverified in the MCP registry

The registry name sits under magic-envelope.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-24
  • Stateanswerschecked 2026-10-24
  • Tools6
  • Server calls itselfcom.magic-envelope/invitations
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-24 the server answered initialize and tools/list without a sign-in. First answer in 119 ms.

Should an agent connect itNot proven either way yet
  • Its tools do every use case we checked: create a free invitation for a birthday or wedding; send an invitation that arrives in a sealed envelope; invite guests to a dinner, party or graduation.
  • Checked on 4 of the 7 days it takes to judge reliability.

Once connected

  • For "create a free invitation for a birthday or wedding", the likely first call is get_catalog.
  • For "send an invitation that arrives in a sealed envelope", the likely first call is get_catalog.
  • For "invite guests to a dinner, party or graduation", the likely first call is get_catalog.
  • create_letter, update_letter, delete_letter change data without a sign-in: anyone with the address can call them.
  • Parameters are untyped or undescribed in 5 of 6 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 4, the first on 2026-10-24
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 4 so far
  • What an agent can do with it3 of 3 use cases
  • Answeredmeasuring4 of the 7 daily checks it takes to print a share
  • Median first answer157 ms
  • Space in an agent's context≈ 4,213 tokensthe definitions of all its tools (6), which an agent carries on every turn
  • Tool definitionsC · 69 of 100
  • Typed results0 of 6 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 5 of 6
  • Not saying whether it only reads or can destroy: 6 of 6

What an agent can do with it

  • can do · create a free invitation for a birthday or wedding
  • can do · send an invitation that arrives in a sealed envelope
  • can do · invite guests to a dinner, party or graduation

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

  • Tools that change data, on a server that answers without a sign-in: create_letter, update_letter, delete_letter

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers6 tools · read 2026-10-24
  • get_catalog

    Styles, occasion presets, block types (with examples), envelope slots, stamps and seal options. Call this first. Each preset has a for list: match the person's words to it (house party, fiesta, quedada → party; cineforum, film club…

  • create_letter

    Create and publish an invitation or letter. Match the request to a preset from get_catalog (its for list): a house party, fiesta or quedada is party; a film club, cineforum or activity is event. Tonight is today's local date. Returns its…

  • get_letter

    Read a letter you created (needs its editKey): its content, links, images, and the guests' RSVP answers (yes / maybe / no, plus who hasn't answered).

  • update_letter

    Change a letter. Only the fields you send change (lang, style… are kept). Links keep working. You may send the same object get_letter returned, including its card wrapper — it is applied. A body with no letter fields is an error, not a…

  • delete_letter

    Delete a letter for good (needs its editKey): its links stop working, and guest names, RSVP answers, images and its app rating are erased.

  • rate_app

    Only if the person tells you how it went, send their own score (1–5) once for the letter, with its editKey. Never rate on your own or assume a score. Agent ratings are kept as feedback; the public average on the home page counts only…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "invitations": {
      "type": "http",
      "url": "https://magic-envelope.com/api/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http magic-envelope https://magic-envelope.com/api/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://magic-envelope.com/api/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.