Koskamo

Relentless Identity MCP

An official MCP server provided by Relentless Identity that enables AI agents to perform B2B email identity discovery and verification. It supports finding likely work emails from names and domains, verifying specific email addresses, and handling batch verifications, integrating seamlessly with coding agents and IDEs via standard MCP transport protocols.

Endpoint and access

OAuth sign-in: the first time you connect, your client opens the vendor's own authorization prompt in a browser.

Relentless Identity MCP logo, by Relentless IdentityVendor evidenceStreamable HTTPOAuth sign-inEndpoint checked 2026-11-06Operated by Relentless Identity
You need:Create an account or sign in at https://relentlessidentity.com/sign-in if you want dashboard-managed billing or the signed-in QR-code crypto checkout.Or buy accountless prepaid access with x402.Use the returned bearer token with the REST API or install the MCP.
MCP endpoint (Streamable HTTP)
https://mcp.relentlessidentity.com/mcp/
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Passed Official MCP Registry namespace is tied to relentlessidentity.com ·
  • Passed Endpoint is on the registry namespace domain ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Find the most likely work email identity from a person's name and company domain
  • Verify a specific work email address for deliverability and identity
  • Verify many known work email addresses in one batch request
  • Integrate email verification workflows into coding agents or IDEs

Source and maintenance

Vendor evidenceRegistry 1.0.0
mcp-registry: com.relentlessidentity/relentless-identity@1.0.0

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (2 of 2 answered).

  1. 2026-11-06: 1 of 1 checks answered
  2. 2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
1230 ms
95th percentile latency
1230 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 1230 ms · metadata changed · refuses unauthenticated initialize (HTTP 401)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http relentless-identity-mcp https://mcp.relentlessidentity.com/mcp/

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add relentless-identity-mcp --url https://mcp.relentlessidentity.com/mcp/

Cursor

Merge this server into .cursor/mcp.json in your project, then enable relentless-identity-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "relentless-identity-mcp": {
      "url": "https://mcp.relentlessidentity.com/mcp/"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "relentless-identity-mcp": {
      "type": "streamableHttp",
      "url": "https://mcp.relentlessidentity.com/mcp/",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start relentless-identity-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "relentless-identity-mcp": {
      "type": "http",
      "url": "https://mcp.relentlessidentity.com/mcp/"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http relentless-identity-mcp https://mcp.relentlessidentity.com/mcp/

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://mcp.relentlessidentity.com/mcp/

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "relentless-identity-mcp": {
      "serverUrl": "https://mcp.relentlessidentity.com/mcp/"
    }
  }
}

Let your agent find its tools

Find servers like Relentless Identity MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.

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Do you run Relentless Identity MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

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