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HAIL.SO
■MCP · 7 clients · no API key

Pick your client.
Hail does the rest.

Hail speaks the Model Context Protocol. Drop the server into any compliant client. Your agent gets call, SMS, and email tools the moment it reconnects. No SDKs, no bridges, no code.

After your first connection, manage authorized apps at hail.so/console/apps.

One config block. 7 clients.

■~60 seconds · OAuth on first call
ClaudeAnthropic
Claude.ai (Web)Claude DesktopClaude Code
Quickstart→
ChatGPTOpenAI
ChatGPT WebChatGPT DesktopCustom GPTs
Quickstart→
Codex CLIOpenAI
Codex CLICodex IDE ExtensionCodex Cloud
Quickstart→
CursorAnysphere
Cursor EditorCursor CLICloud Agents
Quickstart→
VS CodeGitHub Copilot
Copilot ChatAgent ModeVS Code CLI
Quickstart→
Gemini CLIGoogle
Gemini CLICode Assist (VS Code · IntelliJ)
Quickstart→
WindsurfDevin Desktop · Cognition
Devin Desktop EditorDevin Local Agent
Quickstart→

Don't see your client?

Tell us what you use. Or point any MCP-compliant client at the endpoint below. Hail speaks the spec.

Tell us→

Or point any client at the endpoint.

If it speaks the spec, it speaks Hail. Paste the URL into whatever config field your client uses. OAuth handshakes on first call. There is no key to copy.

https://mcp.hail.so
ProtocolMCP · Streamable HTTP
AuthOAuth 2.1 · click Allow on first connect
Voiceplace_call · get_call · list_calls
SMSsend_sms · get_sms · list_sms
Emailsend_email · get_email · list_emails · get_email_stats · get_email_events · get_email_raw · get_email_attachment · upload_email_attachment
Contactscreate_contact · lookup_contact · list_contacts
Eventsget_events
WebhooksPOST · signed · retry-safe
Regionus-east · eu-west · ap-south
■Agent-native · no config UI

No client? Ship the skill.

Headless harnesses like OpenClaw and Hermes onboard from a skill file rather than a settings screen. Point the agent at hail.so/skill.md and it reads the instructions, signs itself up, sends, and reads replies. No human in the loop.

  • Hermes installs skills from a URL, first-class. One command, shown right. The MCP server still works too: add it under mcp_servers in ~/.hermes/config.yaml.
  • OpenClaw prefers its native MCP config: add Hail under mcp.servers in ~/.openclaw/openclaw.json, then openclaw mcp login hail.
  • Anything else: the skill file is plain markdown. If your agent can fetch a URL, it can come online.
Hermes
hermes skills install https://hail.so/skill.md
Any agent
curl https://hail.so/skill.md

18 tools · sign-up, sending, and inbound covered in one file