Ballast

Ballast MCP Server

Official Model Context Protocol (MCP) server implementation for Ballast — connect AI agents to manage cold email campaigns, deliverability warmup, lead lists, and inbox replies.

This repository contains the standalone MCP server package that runs locally via standard I/O (stdio) and connects AI assistants (Claude Desktop, Cursor, Claude Code, Zed, etc.) to your Ballast workspace.

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Features

• Deliverability & DNS Diagnostics: Inspect secondary domains for SPF, DKIM, DMARC alignment, MX configuration, and blacklist health.
• Campaign & Sequence Management: Build multi-step outbound sequences, set A/B variants, configure sending delays, and verify launch checklists.
• Automated Bounce Circuit Breakers: Monitor campaign placement rates and pause sends if bounce rate thresholds are crossed.
• Unified Inbox (Unibox): Read and summarize customer email threads, check sentiment classification, and draft human-confirmed replies.
• Safe by Default: Destructive operations (launching campaigns, sending emails, deleting data) require explicit two-step confirmation with a 10-minute HMAC token.

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Installation & Setup

Requirements

• Node.js >= 18.0.0
• A Ballast workspace API key from Settings > API Keys (starts with bl_).

Run via npx (Recommended)

You can run the server directly without manual installation:

BALLAST_API_KEY="bl_your_key_here" npx -y ballast-mcp

Install from Source

git clone https://github.com/useballast/ballast-mcp.git
cd ballast-mcp
npm install
npm start

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Client Configuration

Claude Desktop

Add Ballast to your claude_desktop_config.json:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "ballast": {
      "command": "npx",
      "args": ["-y", "ballast-mcp"],
      "env": {
        "BALLAST_API_KEY": "bl_your_api_key_here"
      }
    }
  }
}

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Cursor

Add to ~/.cursor/mcp.json (or your project's .cursor/mcp.json):

{
  "mcpServers": {
    "ballast": {
      "command": "npx",
      "args": ["-y", "ballast-mcp"],
      "env": {
        "BALLAST_API_KEY": "bl_your_api_key_here"
      }
    }
  }
}

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Claude Code

claude mcp add --transport stdio ballast -- npx -y ballast-mcp --key=bl_your_api_key_here

(Note: For clients that support remote Streamable HTTP directly, you can also use --transport http ballast https://ballast.to/api/mcp --header "Authorization: Bearer bl_...")

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Tools Reference

The server implements 30 core tools organized by functional area:

Tool	Category	Description
whoami	Workspace	Get authenticated user, active workspace, and permission role.
get_overview	Workspace	Workspace-wide aggregate totals and trends across all campaigns (sends, replies, sentiment, bounces).
get_billing	Workspace	Plan details, sending allowances, dedicated IPs, and usage limits.
check_domain	Domains	Live DNS & deliverability diagnostics on any domain without adding it.
list_domains	Domains	List connected sending domains with deliverability scores and verification status.
add_domain	Domains	Connect and register a new sending domain to the workspace.
list_mailboxes	Mailboxes	List connected Google Workspace and Microsoft 365 mailboxes with daily limits.
add_mailbox	Mailboxes	Connect an external mailbox for outbound outreach.
list_leads	Leads	Search and filter contacts in your workspace.
import_leads	Leads	Import lead contacts with custom variables and tag assignment.
list_lead_lists	Leads	List organized lead segments and member counts.
add_suppressions	Leads	Add email addresses or root domains to workspace-wide do-not-contact lists.
list_campaigns	Campaigns	List outbound sequences with sending schedules and statuses.
create_campaign	Campaigns	Create a new cold email campaign.
get_campaign	Campaigns	Retrieve campaign settings, step variants, and assigned mailboxes.
update_campaign	Campaigns	Update campaign schedule, daily quotas, or track settings.
set_sequence	Campaigns	Configure sequence steps, delays, subject lines, and body copy.
write_sequence	Campaigns	Generate or polish multi-step sequence copy using AI.
add_leads_to_campaign	Campaigns	Enroll lead segments into an active sequence.
preview_campaign	Campaigns	Preview lead send distribution across mailboxes and first send timings.
get_launch_checklist	Campaigns	Check domain alignment, sender warmup, and lead hygiene before launch.
launch_campaign	Campaigns	Launch sequence sending (requires confirm token).
pause_campaign	Campaigns	Immediately pause sending for a campaign.
get_campaign_stats	Campaigns	Daily time-series email metrics for a campaign or all campaigns over time.
get_campaign_analytics	Campaigns	Granular performance breakdown across email providers (Google, Microsoft), mailboxes, and sentiment.
get_unibox_filters	Unibox	Retrieve unified inbox filter presets and label counts.
list_threads	Unibox	List incoming recipient replies and conversation threads.
get_thread	Unibox	Inspect full thread message history, headers, and lead details.
send_reply	Unibox	Send an email reply from the thread's assigned mailbox (requires confirm token).
label_thread	Unibox	Apply sentiment labels (Interested, Meeting Booked, Not Interested, Out of Office).

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Safety: Two-Step Confirmations

To prevent inadvertent mass sends or data deletion:

1. When calling launch_campaign, send_reply, or deletion tools without a confirm_token, the server generates a dry-run preview describing the exact outcome (e.g. "Will send 320 emails across 6 mailboxes") and issues an HMAC token.
2. The AI presents the preview to the user.
3. The action executes only when the user approves and the AI passes the confirm_token.

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Development

git clone https://github.com/useballast/ballast-mcp.git
cd ballast-mcp
npm install
npm test # or npm start

License

MIT © Ballast