Other · Remote MCP server
Crystal
Self-curating memory your AI tools share: provenance, verified citations, and trust tiers.
What the MCP Registry states
The entry as published to the official MCP Registry (read 2026-10-04), latest version.
- Registry name
io.github.EraHQ/crystal- Version
- 1.0.0
- Status
- Active
- Category
- other
- Transport
- Streamable HTTP
- Published
- 2026-09-28
- Updated
- 2026-09-28
- Publisher
- EraHQ (GitHub)
- Namespace
- Namespace verified by the MCP Registry via GitHub (github.com/EraHQ) · how
- Website
- crystal.erahq.ai
- Source
- Registry API entry
Remote endpoints
| Transport | URL | Headers declared |
|---|---|---|
| Streamable HTTP | https://crystal-api-118881845105.us-east5.run.app/mcp | None |
Live check
This directory connected to each remote endpoint and asked for its list of tools. The check connects and lists tools only; it doesn't run tools, sign in or test security.
- Reachable
- Yes (HTTP 401)
- Handshake
- Not completed: sign-in required
- Sign-in required
- Yes - HTTP 401; OAuth advertised (the answer points to its authorization metadata)
- Checked on
- 2026-10-05
How to connect Crystal
Crystal is a remote MCP server: there is nothing to install. Its endpoint is https://crystal-api-118881845105.us-east5.run.app/mcp, served over Streamable HTTP. In an assistant that accepts remote MCP servers (often under a setting named connectors, integrations or tools), add a new server and give it this URL; in a client configured by file, add it as a remote (HTTP) server with the same URL.
No headers are declared in the registry entry. If the server needs you to sign in, a client that supports MCP authorization opens the service's own sign-in page when it first connects.
Derived from the registry entry; the live check above only shows whether the endpoint answered. What the server does, and on what terms, is set by its publisher; check its repository or website before giving it access to your accounts or files. How to add an MCP server to an assistant · Before you connect
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