OpenSDR

io.github.arif-js/opensdr-mcpv1.0.1Email

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

The current version, v1.0.1, was published to the official MCP registry on 2026-10-15. It is distributed as opensdr-mcp on npm, filed under Email by this index, and declares 9 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 OpenSDR 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 2026-11-14 20:08 UTC

screened 2026-10-15tier: scannedgranularity: description-levelsource: registry

Semantic screen found no manipulation pattern in the description. Conformance probe not yet run.

mcpindex.integrity.descriptionpassINFO

evidence“Tool performs B2B prospecting and email enrichment.”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? Test a description on the public screen → It is a separate check from the verdict above, so the two can differ.

That verdict was true at screening time (snapshot 2026-10-19).

Contracts can change after screening, with no version bump. The gate pins OpenSDR’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 OpenSDR](https://mcpindex.ai/server/io-github-arif-js-opensdr-mcp) - screening verdict, registry provenance, and contract drift monitoring.

HTML

<a href="https://mcpindex.ai/server/io-github-arif-js-opensdr-mcp">Independent trust record for OpenSDR</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-arif-js-opensdr-mcp)](https://mcpindex.ai/server/io-github-arif-js-opensdr-mcp)

HTML

<a href="https://mcpindex.ai/server/io-github-arif-js-opensdr-mcp"><img src="https://mcpindex.ai/api/v1/badge/io-github-arif-js-opensdr-mcp" alt="mcpindex verdict" height="20" /></a>

Environment variables

APOLLO_API_KEY

secret

Apollo API key for people/company search and enrichment (optional)

HUNTER_API_KEY

secret

Hunter API key for email finding and verification (optional)

EXA_API_KEY

secret

Exa API key for buying signals and account research (optional)

TAVILY_API_KEY

secret

Tavily API key, an alternative to Exa for signals and research (optional)

INSTANTLY_API_KEY

secret

Instantly API v2 key for draft campaigns and lead enrollment (optional)

HUBSPOT_ACCESS_TOKEN

secret

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)

MCP quality score · maturity, not trust · methodology

freshness

completeness

installability

documentation

stability

Alternatives in Email

BlitzAPI

ai.blitz-api/b2b-data

Search and enrich B2B companies and people: verified work emails, US phone numbers, job postings.

Oneprofile

ai.getoneprofile/oneprofile

Find prospects, research them, and run email and LinkedIn outreach in your Oneprofile workspace.

io.github.arose26/mbox-mcp

Search local email archives (.mbox/.eml) entirely on your machine. No OAuth, no cloud.

Install this server

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "opensdr-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "opensdr-mcp"
      ],
      "env": {
        "APOLLO_API_KEY": "<your-apollo_api_key>",
        "HUNTER_API_KEY": "<your-hunter_api_key>",
        "EXA_API_KEY": "<your-exa_api_key>",
        "TAVILY_API_KEY": "<your-tavily_api_key>",
        "INSTANTLY_API_KEY": "<your-instantly_api_key>",
        "HUBSPOT_ACCESS_TOKEN": "<your-hubspot_access_token>",
        "OPENSDR_READ_ONLY": "0",
        "OPENSDR_MAX_CREDITS_PER_CALL": "25",
        "OPENSDR_DATA_DIR": "<opensdr_data_dir>"
      }
    }
  }
}

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "opensdr-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "opensdr-mcp"
      ],
      "env": {
        "APOLLO_API_KEY": "<your-apollo_api_key>",
        "HUNTER_API_KEY": "<your-hunter_api_key>",
        "EXA_API_KEY": "<your-exa_api_key>",
        "TAVILY_API_KEY": "<your-tavily_api_key>",
        "INSTANTLY_API_KEY": "<your-instantly_api_key>",
        "HUBSPOT_ACCESS_TOKEN": "<your-hubspot_access_token>",
        "OPENSDR_READ_ONLY": "0",
        "OPENSDR_MAX_CREDITS_PER_CALL": "25",
        "OPENSDR_DATA_DIR": "<opensdr_data_dir>"
      }
    }
  }
}

Cline (cline_mcp_settings.json)

npx -y -- opensdr-mcp

Claude Code (claude mcp add)

claude mcp add --scope user opensdr-mcp -- npx -y -- opensdr-mcp

Gemini CLI (gemini mcp add)

gemini mcp add -s user opensdr-mcp npx -y -- opensdr-mcp

Verdict API

curl -s mcpindex.ai/api/v1/trust/server/io-github-arif-js-opensdr-mcp

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

Details

version: v1.0.1
category: Email
verdict expires: 2026-11-14
quality: 90 / 100
operator: arif-js

Listing

Listed from the official MCP registry. Unclaimed by its maintainer. Maintainer? 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 972,115). Verify it yourself.

Links

Repository →