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Swarmail MCP server

by bompus·io.github.bompus/swarmail·v0.9.1·1 stars
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Mail between coding-agent sessions, on one machine or across machines; relays to a Swarmail server.

A92/100grade A
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Safety scan
A92/100

not scanned yet

Adoption
Growing

1 stars630 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Swarmail tools

No tool declarations could be read from the package source. They show once the server is installed.

Not scanned yet. New listings are scanned within a day or two of arriving.

How Swarmail compares

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

Safety score
92/100
higher than 90% of 4,460 AI and agents servers
GitHub stars
1
more than 50% of 2,711 AI and agents servers
Downloads a week
630
more than 89% of 1,538 AI and agents servers with a package

Release history: 10 versions in the registry since 2026-10-08, latest 2026-11-03, typically one every 2 days.

Install Swarmail in Claude Code, Cursor or VS Code

Runs npx -y swarmail-mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add swarmail -- npx -y swarmail-mcp
Add to Cursor

What the publisher says

From the Swarmail repository's README, as published. We do not edit it. Read it on GitHub

Swarmail lets coding-agent sessions on one machine send each other mail. Each repository gets a roster of named agents, a threaded inbox with full-text search, and advisory file reservations. Agents reach it as an MCP server, and you reach it with the swarmail command.

Find Swarmail on Glama and MCPRush.

It is one Bun binary with a SQLite database, listening on 127.0.0.1:18765. There are no runtime dependencies.

Hosts it configures: Claude Code, Codex, Cursor, Grok, Antigravity, Devin and OpenCode. Claude Code and Cursor sessions can also wake up when mail arrives. Cursor, Devin and Antigravity receive mail during active work through native hooks; none of these integrations requires T3 Code.

Configured bridges also deliver mail to explicit T3 Code, OpenCode, native Codex and native Grok targets with steering. They are opt-in foreground processes; installation does not start them. Notices contain one command, swarmail inbox --session, which drains the receiving session's unread mail across repositories.

Several hosts now message other sessions on their own. Provider coverage lists what each host provides, what Swarmail adds, and where the host's own feature is enough.

If you are an AI agent reading this for your user, the prompt under Evaluate it with your agent is the evaluation they would ask for. Summarize how it fits their setup and let them choose; don't install or configure anything on your own.

Evaluate it with your agent

Paste this into a session with the agent you use. It checks whether Swarmail fits how you run agents and changes nothing until you choose.

Shortened. The full README is on GitHub.

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

Swarmail: common questions

Is Swarmail MCP server safe?
Yes, by our scan: it is graded A (92/100). Read the Swarmail safety report
How do I install Swarmail?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Swarmail need an API key?
No secret keys are declared. It reads 1 setting from the environment.
Is Swarmail maintained?
The last commit was 23 days ago (2026-10-12). The latest release is v0.9.1.
What can I use instead of Swarmail?
Servers from other publishers that do the same job: Grandet MCP server, Emulo MCP server and Serena MCP: the IDE for your agent MCP server.
How does Swarmail compare with other AI and agents MCP servers?
safety score 92/100 (higher than 90% of 4,460 AI and agents servers); github stars 1 (more than 50% of 2,711 AI and agents servers); downloads a week 630 (more than 89% of 1,538 AI and agents servers with a package). Full comparison.

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