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Coldrig (agent-cold-email)

Coldrig is an MCP-based cold email infrastructure kit aimed at developers and growth teams who need to programmatically manage outreach campaigns. It bundles domain and mailbox provisioning, warmup flows, campaign orchestration, reply handling, and compliance guardrails into a single hosted MCP server accessible via a bearer token. The project exposes around 28 tools over MCP and HTTP, plus an npm CLI, so you can spin up and control inboxes, run warmup sequences, send templated campaigns, and process replies directly from your own code or agent workflows. A free sandbox is available for testing, and the server-enforced guardrails are designed to reduce the risk of getting flagged by providers. Compared to stitching together separate email APIs, SMTP providers, and warmup services, Coldrig offers a more opinionated, integrated path that prioritizes deliverability safety and developer ergonomics. It's best suited for teams already comfortable with MCP or building agentic growth tooling who want to offload the plumbing of cold outreach while keeping control over messaging and targeting logic.

Open ecosystemMarketingMarketing
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01 / SERVER DETAIL

Server detail

Coldrig is an MCP-based cold email infrastructure kit aimed at developers and growth teams who need to programmatically manage outreach campaigns. It bundles domain and mailbox provisioning, warmup flows, campaign orchestration, reply handling, and compliance guardrails into a single hosted MCP server accessible via a bearer token. The project exposes around 28 tools over MCP and HTTP, plus an npm CLI, so you can spin up and control inboxes, run warmup sequences, send templated campaigns, and process replies directly from your own code or agent workflows. A free sandbox is available for testing, and the server-enforced guardrails are designed to reduce the risk of getting flagged by providers. Compared to stitching together separate email APIs, SMTP providers, and warmup services, Coldrig offers a more opinionated, integrated path that prioritizes deliverability safety and developer ergonomics. It's best suited for teams already comfortable with MCP or building agentic growth tooling who want to offload the plumbing of cold outreach while keeping control over messaging and targeting logic.

An MCP server that exposes Coldrig (agent-cold-email) capabilities to MCP-compatible AI clients.

CapabilitiesMarketingMCPOpen source
ProtocolModel Context Protocol
Developer ecosystemOpen ecosystem
LicenseMIT / check source
SourceGitHub
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02 / TOOL TESTING

Tool testing

AVAILABLE TOOL

coldrig--agent-cold-email-

Callable

Call the MCP capabilities provided by Coldrig (agent-cold-email) and return a structured result.

PARAMETERS
inputPass arguments according to the server tool schema.
Tip: the tool may truncate responses. Use pagination parameters such as start_index to read long content in chunks.
03 / SERVICE CONFIGURATION

Connection modes

Remote
{
  "mcpServers": {
    "Coldrig (agent-cold-email)": {
      "url": "Generated by the provider after deployment"
    }
  }
}

The Remote endpoint is generated by the provider after deployment; this page does not fabricate an unusable endpoint.

03 / WORKFLOW

How to use

  1. 01
    Step 1

    Review server capabilities and permission scope.

  2. 02
    Step 2

    Copy the install command or JSON configuration.

  3. 03
    Step 3

    Run a small connection test in your client.

  4. 04
    Step 4

    Adopt it long term only after reviewing access and maintenance.

04 / DISCUSSIONS

Discussions

Use this space to keep checking source information, usage experience and maintenance status.

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