ReasonGraph Cloud MCP MCP server

ReasonGraph Cloud provides graph-based memory for AI agents, enabling cross-session recall, causal reasoning, and time-travel queries. It stores facts as plain sentences linked by entities and cause-effect relationships, allowing agents to answer 'why' and 'what if' questions with cited sources. The service supports integration via MCP, LangChain, and direct API calls, running on Primaxiom's servers with small open models for reasoning.

Endpoint and access

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

OAuth sign-inEndpoint checked 2026-10-05Operated by Primaxiom

MCP endpoint (Streamable HTTP)

https://memory.primaxiom.ai/mcp

Vendor documentation

What you can do with it

Enable cross-session recall for AI agents
Trace causal chains to answer 'why did this happen'
Query memory as of a past date for time travel
Integrate graph memory into Claude Code via MCP

Connect from your client

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

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Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http reasongraph-cloud-mcp https://memory.primaxiom.ai/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 reasongraph-cloud-mcp --url https://memory.primaxiom.ai/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable reasongraph-cloud-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "reasongraph-cloud-mcp": {
      "url": "https://memory.primaxiom.ai/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "reasongraph-cloud-mcp": {
      "type": "streamableHttp",
      "url": "https://memory.primaxiom.ai/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start reasongraph-cloud-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "reasongraph-cloud-mcp": {
      "type": "http",
      "url": "https://memory.primaxiom.ai/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 reasongraph-cloud-mcp https://memory.primaxiom.ai/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "reasongraph-cloud-mcp": {
      "url": "https://memory.primaxiom.ai/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": {
    "reasongraph-cloud-mcp": {
      "serverUrl": "https://memory.primaxiom.ai/mcp"
    }
  }
}

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