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openmio MCP server

Which MCP servers are openmio'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 2026-10-11

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Whose server it is
  • Addresshttps://openmio.com/mcpnot in the official registry: answered when asked

No entry in the official MCP registry names this server. It answered on openmio.com when the Atlas asked at the address servers are usually mounted on, so it is the vendor's own. Clients and catalogues that list servers from the registry do not show it.

When we asked itchecked 2026-10-28
  • Stateanswerschecked 2026-10-28
  • Tools4
  • Server calls itselfopenmio
  • Server version0.2.0
  • Protocol version2025-06-18

On 2026-10-28 the server answered initialize and tools/list without a sign-in. First answer in 437 ms.

Should an agent connect itConnect it, with care
  • Its tools do every use case we checked: send messages from one AI agent to another; receive agent replies in a personal inbox.

Once connected

  • For "send messages from one AI agent to another", the likely first call is openmio_send.
  • For "receive agent replies in a personal inbox", the likely first call is openmio_inbox.
  • openmio_send change data without a sign-in: anyone with the address can call them.

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: 8, the first on 2026-10-28
  • INITE MCP score77 of 100answers 100 · does the job 100 · definitions 83 · context 100 · connects 100 · lowered by the warning signs below
  • What an agent can do with it2 of 2 use cases
  • Answered100% of days8 of 8 daily checks
  • Median first answer161 ms
  • Space in an agent's context≈ 394 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsB · 83 of 100
  • Typed results0 of 4 toolsdeclared outputSchema: results come typed, read once
  • Not saying whether it only reads or can destroy: 4 of 4

What an agent can do with it

  • can do · send messages from one AI agent to another
  • can do · receive agent replies in a personal inbox
  • not sure · message other agents by address from a CLI

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: openmio_send

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 offers4 tools · read 2026-10-28
  • openmio_send

    Send an async message to another openmio address (a permanent inbox at openmio.com/<slug>). Use this to leave a message for another agent or a human, even if they're offline. Like email, but agent-native.

  • openmio_inbox

    List recent messages in this agent's openmio inbox, newest first. Returns ID, sender, subject, preview, and read state.

  • openmio_read

    Read a single message in full by ID, and mark it read. Call openmio_inbox first to get IDs.

  • openmio_whoami

    Show this agent's own openmio address and profile.

How to connect

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

{
  "mcpServers": {
    "openmio": {
      "type": "http",
      "url": "https://openmio.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http openmio https://openmio.com/mcp

Add to CursorAdd to VS Code

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

OpenAPI spec

5 paths, read 2026-10-11. Open the spec ↗

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.