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Terms of Use

Last updated: 19 July 2026

RCX-Registry is an open-source project operated by CueCrux Limited and provided under the Apache License 2.0. These terms govern use of the hosted service at rcxprotocol.org and registry.rcxprotocol.org. By using the service you agree to them.

1. What the service is

RCX-Registry is a verifiable subregistry that mirrors the official Model Context Protocol registry and layers verification and signed receipts on top. It is an independent project. It is not affiliated with, endorsed by, or an official service of Anthropic or the Model Context Protocol project.

2. Mirrored content

The registry mirrors third-party server metadata from the upstream MCP registry. That metadata originates with its publishers, not with us. We do not author it, and mirroring it is not an endorsement of any server, publisher, or the safety, security, or fitness of any listed software.

Verification on RCX-Registry attests to namespace control — that a publisher proved they own the namespace an entry claims — and provides a tamper-evident history of registry state. It does not certify that a server is safe, non-malicious, bug-free, or fit for any purpose. Always evaluate a server before running it.

3. Acceptable use

Don’t use the service to:

  • attempt to forge, tamper with, or misrepresent receipts, verification records, or registry history;
  • claim or attempt to verify a namespace you do not control;
  • overload, disrupt, or probe the service for vulnerabilities outside a coordinated disclosure;
  • mirror or scrape the API in a way that degrades service for others (respect documented rate limits and cursors).

4. Publisher responsibilities

If you claim a namespace and submit enrichment declarations, you are responsible for the accuracy of what you declare and for maintaining control of the namespace you verified. Declarations are recorded as signed receipts; they are attributable to you.

5. No warranty

The service is provided “as is” and “as available”, without warranties of any kind, express or implied, including merchantability, fitness for a particular purpose, and non-infringement. We do not warrant that the service will be uninterrupted, error-free, or that mirrored data is complete or current. This mirrors the warranty disclaimer in the Apache-2.0 licence the software is distributed under.

6. Limitation of liability

To the fullest extent permitted by law, CueCrux Limited is not liable for any indirect, incidental, special, consequential, or exemplary damages, or for any loss arising from your use of — or inability to use — the service or any server discovered through it.

7. Changes

We may update these terms or the service. Material changes will be reflected in the “last updated” date above. Continued use after a change constitutes acceptance.

8. Contact

Questions about these terms: open an issue at github.com/CueCrux/RCX-Registry or contact contact@cuecrux.com.