Hail MCP Server

Give your agent a real phone number and an email inbox - in minutes, not days. It is available as a remote MCP endpoint.

Teams that want a hosted email endpoint instead of running a local process. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-08-24 · ★ 23 · #50 OF 75 MAINTAINED EMAIL · VERIFIED 2026-08-25

AGPL-3.0 · Python servers · how we verify → /methodology

01 · Install Hail

before you install - you'll need

Set HAIL_API_URL, HAIL_API_KEY before connecting.

Claude Code

claude mcp add hail-hq-hail --transport http https://mcp.hail.so

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "hail-hq-hail": {
      "url": "https://mcp.hail.so"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://mcp.hail.so

transport: streamable-http

endpoint alive - authentication required · probed 2026-08-25

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as remote - your agent's requests go to mcp.hail.so

endpoint auth requires authentication - rejected our unauthenticated MCP initialize

license AGPL-3.0 - declared in the repository

registry namespace io.github.hail-hq is GitHub-verified and matches the repo owner

03 · What Hail can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v0.20.0 · 2026-08-14

Sender display names on outbound email, and a 25MB attachment cap. · Component versions cut alongside this release: · sdk-v0.14.0 (PyPI: hail-sdk==0.14.0), cli-v0.19.0 (Homebrew + GitHub Releases). · Email · POST…

v0.19.0 · 2026-07-27

The voice agent never speaks tool-call syntax again, and call events say what tools actually did. cli-v0.18.0 cut alongside; the SDK is unchanged and stays at hail-sdk==0.13.0. · Voicebot speech sanitizer · LLM turns…

v0.18.0 · 2026-07-23

Readable call tails in the CLI. cli-v0.17.0 cut alongside; the SDK is unchanged and stays at hail-sdk==0.13.0. · hail tail call-transcript display overhaul: turns render as [hail] / [human] (was [agent] / [user])…

04 · Who maintains Hail

Hail is maintained by hail-hq. It's the only MCP server we track from this author; the repo dates to Apr 2026.

05 · Facts

repository: github.com/hail-hq/hail
website: https://hail.so/mcp
category: email - ranked #50 of 75 actively-maintained email servers as of 2026-08-25.
release cadence: 10+ releases in the last 90 days (latest 2026-08-14)
registry: io.github.hail-hq/hail-mcp (active, first published 2026-07-07)

06 · Hail FAQ

What is Hail?

Give your agent a real phone number and an email inbox - in minutes, not days. It is available as a remote MCP endpoint.

Is Hail still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-24 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

How do I install Hail?

Run `claude mcp add hail-hq-hail --transport http https://mcp.hail.so`. The README documents 2 environment variables (HAIL_API_URL, HAIL_API_KEY) to set first. Set HAIL_API_URL, HAIL_API_KEY before connecting. You can also paste the ready-made client config above.

Does Hail require authentication?

Yes - when we probed the endpoint on 2026-08-25, it rejected an unauthenticated MCP initialize; you'll need credentials to connect.

07 · Alternatives to Hail

Alternatives to Hail

Maintained email servers if Hail isn't the fit.

More email MCP servers · Claw Link · Grad Agent · Apple Mail MCP (imdinu) · Aruba Email & Calendar

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