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Winback MCP server

Which MCP servers are Winback's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-27

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Whose server it is
  • Registry namecom.winbackhq/winbackverified in the MCP registry

The registry name sits under winbackhq.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-27
  • Stateanswerschecked 2026-10-27
  • Tools4
  • Server calls itselfcom.winbackhq/winback
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-27 the server answered initialize and tools/list without a sign-in. First answer in 501 ms.

Should an agent connect itSkip it
  • Its tools do none of the product's use cases we checked: draft a personal win-back note for each lapsed subscriber; track which lapsed subscribers resubscribe within thirty days.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 7, the first on 2026-10-27
  • INITE MCP score72 of 100answers 100 · does the job 0 · definitions 100 · context 100 · connects 100
  • What an agent can do with it0 of 2 use cases
  • Answered100% of days7 of 7 daily checks
  • Median first answer490 ms
  • Space in an agent's context≈ 451 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 4 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • cannot · draft a personal win-back note for each lapsed subscriber
  • cannot · track which lapsed subscribers resubscribe within thirty days

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers4 tools · read 2026-10-27
  • get_winback_overview

    What Winback does, who it is for, what it needs and what it does not do. Use this when someone asks how to win back churned subscribers of an iOS, Android or Stripe subscription app.

  • get_winback_pricing

    Winback pricing terms.

  • estimate_win_back_revenue

    Same formula as https://winbackhq.com/tools/win-back-revenue-calculator/ : people lost per segment times a return rate, times price, over up to 6 months, minus the 15% fee. Default return rates: cancelled 20% (RevenueCat SOSA 2026 monthly…

  • get_apple_retention_facts

    Sourced facts on App Store billing retry, grace periods, win-back offers and Retention Messaging, for founders planning a win-back.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "winback": {
      "type": "http",
      "url": "https://winbackhq.com/mcp/"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http winbackhq https://winbackhq.com/mcp/

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://winbackhq.com/mcp/ as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.