io.github.YS-projectcalc/agent-cold-email

io.github.YS-projectcalc/agent-cold-emailv0.2.3Email

Coldrig — cold-email infra run by your agent: 28 MCP tools, live sending, free sandbox. $99/mo.

The current version, v0.2.3, was published to the official MCP registry on 2026-08-17. It is distributed as agent-cold-email on npm and as a hosted remote over streamable-http, filed under Email by this index, and declares 2 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; the index's current counts put this record in context.

In-path gate · all MCP tools

Using io.github.YS-projectcalc/agent-cold-email in Claude, Cursor, Gemini CLI, Cline, or Zed?

MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).

Install the mcpindex gate (one command)

Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less

uv tool install mcpindex-gate && mcpindex-config-wire

Auditable install path →Watch it hold a drift →

Trust verdict · v1 advisory · method

REVIEWstatus: PARTIALfresh until 2026-09-16 07:03 UTC

screened 2026-08-17tier: scannedgranularity: description-levelsource: registry

Semantic screen flagged a possible manipulation pattern in the description; review before your agent calls this tool.

held for reviewThe semantic screen raised a flag, but it has not been human-reviewed. It is held - not a confirmed finding - until a reviewer confirms or clears it.

mcpindex.integrity.descriptionfailLOW

evidence“sends emails without user request”via static_description

Limits of this verdict

- Semantic screen only - the deterministic conformance probe has not run on this server
- Confidence is reported but not yet calibrated (v1)
- Screen reads the tool description, not the live behavior
- advisory
- registry description only no input schema
- screen model 8b

Semantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page.

Own this server? Screen its description →

That verdict was true at screening time (snapshot 2026-09-02).

Contracts can change after screening, with no version bump. The gate pins io.github.YS-projectcalc/agent-cold-email’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.

See your first HOLD in 2 minutes →

Cite this record

People vet a server before wiring it in. One line on your project site or docs answers that with an independent record: screening verdict, registry provenance, contract drift history. It stays current as new screens and drift events land.

Markdown

[Independent trust record for io.github.YS-projectcalc/agent-cold-email](https://mcpindex.ai/server/io-github-ys-projectcalc-agent-cold-email) - screening verdict, registry provenance, and contract drift monitoring.

HTML

<a href="https://mcpindex.ai/server/io-github-ys-projectcalc-agent-cold-email">Independent trust record for io.github.YS-projectcalc/agent-cold-email</a> - screening verdict, registry provenance, and contract drift monitoring.

Embed this badge

A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.

Markdown

[![mcpindex](https://mcpindex.ai/api/v1/badge/io-github-ys-projectcalc-agent-cold-email)](https://mcpindex.ai/server/io-github-ys-projectcalc-agent-cold-email)

HTML

<a href="https://mcpindex.ai/server/io-github-ys-projectcalc-agent-cold-email"><img src="https://mcpindex.ai/api/v1/badge/io-github-ys-projectcalc-agent-cold-email" alt="mcpindex verdict" height="20" /></a>

Environment variables

AGENT_COLD_EMAIL_API_KEY

secret

Bearer token from POST /signup (free, no card) — or run `npx agent-cold-email demo` first. Optional at startup: without it, `initialize`/`tools/list` still work (unauthenticated introspection), but every `tools/call` fails until a key is set.

AGENT_COLD_EMAIL_BASE_URL

Override the API base URL (default: https://agent-cold-email-api.yaakovscher.workers.dev)

MCP quality score · maturity, not trust · methodology

freshness

completeness

installability

documentation

stability

Alternatives in Email

Mermail

app.mermail/mcp

Privacy-first email inboxes for AI agents with MCP mail tools and Composio connect/execute.

MCP Emails

com.mcpemails/emails

Read, search, send, organize, draft and schedule email across your inboxes from any MCP client.

Marketo

io.github.ZLeventer/marketo-mcp-server

MCP server for Marketo — 32 tools for leads, programs, emails, forms, lists, and bulk export.

Install this server

Remote endpoint

Streamable HTTP / SSE endpoint. Add to any MCP client that supports remote servers.

https://agent-cold-email-api.yaakovscher.workers.dev/mcp

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "agent-cold-email": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "agent-cold-email"
      ],
      "env": {
        "AGENT_COLD_EMAIL_API_KEY": "<your-agent_cold_email_api_key>",
        "AGENT_COLD_EMAIL_BASE_URL": "<agent_cold_email_base_url>"
      }
    }
  }
}

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "agent-cold-email": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "agent-cold-email"
      ],
      "env": {
        "AGENT_COLD_EMAIL_API_KEY": "<your-agent_cold_email_api_key>",
        "AGENT_COLD_EMAIL_BASE_URL": "<agent_cold_email_base_url>"
      }
    }
  }
}

Cline (cline_mcp_settings.json)

npx -y -- agent-cold-email

Claude Code (claude mcp add)

claude mcp add --scope user agent-cold-email -- npx -y -- agent-cold-email

Gemini CLI (gemini mcp add)

gemini mcp add -s user agent-cold-email npx -y -- agent-cold-email

Verdict API

curl -s mcpindex.ai/api/v1/trust/server/io-github-ys-projectcalc-agent-cold-email

Free-tier verdict as JSON: decision + dimensions + severity. Call it from your agent before it invokes a tool it just discovered.

Details

version: v0.2.3
category: Email
verdict expires: 2026-09-16
quality: 85 / 100
operator: YS-projectcalc

Listing

Listed from the official MCP registry. Unclaimed by its maintainer. Maintainer? Verify it → · or email us →

Provenance

Each verdict is bound to a hash of the exact description it judged, so a re-crawl that changes the text produces a new record rather than silently inheriting this one. Verdict history is hash-chained and anchored to Bitcoin via OpenTimestamps (latest confirmed at block 964,988). Verify it yourself.

Links

Repository →Website →

Remote endpoint

https://agent-cold-email-api.yaakovscher.workers.dev/mcp