OpenSDR MCP Server

by arif-jsio.github.arif-js/opensdr-mcpv1.0.1

Open-source AI SDR: B2B prospecting, email enrichment, buying signals and safe outreach staging.

0Node.jsstdioofficial registry

context tax

pending

security

pending

cold start

pending

freshness

pending

Our reading of OpenSDR, from the data

OpenSDR is a email MCP server from arif-js, listed in the official MCP Registry.

We haven't measured its tool list yet, so its token cost is unknown.

With 0 GitHub stars it ranks #267 of 932 email servers we index.

It runs locally on your machine over stdio and needs 6 secrets (APOLLO_API_KEY, HUNTER_API_KEY, EXA_API_KEY, …); use a scoped, least-privilege key.

Install OpenSDR MCP server

claude mcp add opensdr -e APOLLO_API_KEY='<apollo-api-key>' -e HUNTER_API_KEY='<hunter-api-key>' -e EXA_API_KEY='<exa-api-key>' -e TAVILY_API_KEY='<tavily-api-key>' -e INSTANTLY_API_KEY='<instantly-api-key>' -e HUBSPOT_ACCESS_TOKEN='<hubspot-access-token>' -- npx -y opensdr-mcp

{
  "mcpServers": {
    "opensdr": {
      "command": "npx",
      "args": [
        "-y",
        "opensdr-mcp"
      ],
      "env": {
        "APOLLO_API_KEY": "<apollo-api-key>",
        "HUNTER_API_KEY": "<hunter-api-key>",
        "EXA_API_KEY": "<exa-api-key>",
        "TAVILY_API_KEY": "<tavily-api-key>",
        "INSTANTLY_API_KEY": "<instantly-api-key>",
        "HUBSPOT_ACCESS_TOKEN": "<hubspot-access-token>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "opensdr": {
      "command": "npx",
      "args": [
        "-y",
        "opensdr-mcp"
      ],
      "env": {
        "APOLLO_API_KEY": "<apollo-api-key>",
        "HUNTER_API_KEY": "<hunter-api-key>",
        "EXA_API_KEY": "<exa-api-key>",
        "TAVILY_API_KEY": "<tavily-api-key>",
        "INSTANTLY_API_KEY": "<instantly-api-key>",
        "HUBSPOT_ACCESS_TOKEN": "<hubspot-access-token>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "opensdr": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "opensdr-mcp"
      ],
      "env": {
        "APOLLO_API_KEY": "<apollo-api-key>",
        "HUNTER_API_KEY": "<hunter-api-key>",
        "EXA_API_KEY": "<exa-api-key>",
        "TAVILY_API_KEY": "<tavily-api-key>",
        "INSTANTLY_API_KEY": "<instantly-api-key>",
        "HUBSPOT_ACCESS_TOKEN": "<hubspot-access-token>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "opensdr": {
      "command": "npx",
      "args": [
        "-y",
        "opensdr-mcp"
      ],
      "env": {
        "APOLLO_API_KEY": "<apollo-api-key>",
        "HUNTER_API_KEY": "<hunter-api-key>",
        "EXA_API_KEY": "<exa-api-key>",
        "TAVILY_API_KEY": "<tavily-api-key>",
        "INSTANTLY_API_KEY": "<instantly-api-key>",
        "HUBSPOT_ACCESS_TOKEN": "<hubspot-access-token>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
APOLLO_API_KEY	—	yes	Apollo API key for people/company search and enrichment (optional)
HUNTER_API_KEY	—	yes	Hunter API key for email finding and verification (optional)
EXA_API_KEY	—	yes	Exa API key for buying signals and account research (optional)
TAVILY_API_KEY	—	yes	Tavily API key, an alternative to Exa for signals and research (optional)
INSTANTLY_API_KEY	—	yes	Instantly API v2 key for draft campaigns and lead enrollment (optional)
HUBSPOT_ACCESS_TOKEN	—	yes	HubSpot private-app token for contact sync (optional)
OPENSDR_READ_ONLY	—	—	Set to 1 to disable every tool that writes to an external service
OPENSDR_MAX_CREDITS_PER_CALL	—	—	Hard cap on estimated paid provider credits per tool call
OPENSDR_DATA_DIR	—	—	Local data directory for lists, cache and suppression list (default ~/.opensdr)

Freshness

Not enough public signals yet to judge maintenance.

Last commit (default branch)
2026-10-15 · 3d ago · GitHub
Latest release
2026-10-15 · 3d ago · GitHub · v1.0.1
Package published
no data · npm/PyPI
Registry entry updated
2026-10-15 · 3d ago · official registry · v1.0.1

How it compares in Email

Against the most-starred email servers we index. Token cost is per model turn, measured from each server's live tool list.

Server	Stars	Tools	Tokens / turn	Freshness	Runs
OpenSDR (this)	0	—	not measured	—	local
Inbox Zero	12,649	—	not measured	Active	hosted
Useplunk	5,524	—	not measured	—	local
Google Workspace	3,370	—	not measured	Active	—
OpenOSINT	1,776	—	not measured	Active	local
emailmd	1,382	3	954	Active	local + hosted

All email MCP servers

FAQ

›How do I install the OpenSDR MCP server in Claude Code?

Run: claude mcp add opensdr -e APOLLO_API_KEY='<apollo-api-key>' -e HUNTER_API_KEY='<hunter-api-key>' -e EXA_API_KEY='<exa-api-key>' -e TAVILY_API_KEY='<tavily-api-key>' -e INSTANTLY_API_KEY='<instantly-api-key>' -e HUBSPOT_ACCESS_TOKEN='<hubspot-access-token>' -- npx -y opensdr-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does OpenSDR require an API key?

Yes. It expects APOLLO_API_KEY, HUNTER_API_KEY, EXA_API_KEY, TAVILY_API_KEY, INSTANTLY_API_KEY, HUBSPOT_ACCESS_TOKEN, of which 6 are secrets.

›Can I use OpenSDR as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is OpenSDR in the official MCP registry?

Yes, as io.github.arif-js/opensdr-mcp.

Sources and method

Official MCP Registry entry: updated 2026-10-15
GitHub repository: fetched 2026-10-19
Package registry (npm / PyPI): listed
Last checked against all sources: 2026-10-19

The description, packages and links come from the maintainer's own published metadata. Token cost, security signals, freshness and the reading above are MCPSkillHub's own measurements; see the methodology. Spot an error? Request a correction or claim the listing.