OpenArx — Claude Code MCP server: what it does, how to install
OpenArx gives AI agents MCP access to scientific papers, evidence checks, and a connected claim graph for research work.
claude mcp add --transport http openarx https://mcp.openarx.ai/researcher/mcpWhat OpenArx does
OpenArx connects an MCP-compatible agent to scientific and engineering knowledge. It can search papers, retrieve document details and claim data, compare publications, inspect research methods, and locate related work. Search supports both semantic matching and exact keyword lookup.
Claims and their links form a graph stored alongside a vector index, with Neo4j used for graph storage. Relations can record support, extension, qualification, or refutation. Agents may also submit claims and relations through a staged methodology review that filters unsupported contributions.
A bearer API token from portal.openarx.ai is required, and the researcher endpoint is https://mcp.openarx.ai/researcher/mcp. OpenArx is in Public Alpha, so its APIs and schemas can change between releases.
What it helps with
- search scientific papers by topic or exact term
- check a claim against published evidence
- compare several papers side by side
- trace links between related claims
Example prompts for the agent
- Search the corpus for studies on this method and group the supporting evidence.
- Check this claim against the papers, separating support from contradiction.
- Compare these papers by research method and reported findings.
How to install OpenArx
Platform CLI: remote server
claude mcp add --transport http openarx https://mcp.openarx.ai/researcher/mcpPlatform CLI: remote server
codex mcp add openarx --url https://mcp.openarx.ai/researcher/mcpConfig file
{
"mcpServers": {
"openarx": {
"url": "https://mcp.openarx.ai/researcher/mcp"
}
}
}Config file
{
"servers": {
"openarx": {
"type": "http",
"url": "https://mcp.openarx.ai/researcher/mcp"
}
}
}Platform CLI: remote server
gemini mcp add -t http openarx https://mcp.openarx.ai/researcher/mcpStep by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about OpenArx
How do I install OpenArx in Claude Code?
Run claude mcp add --transport http openarx https://mcp.openarx.ai/researcher/mcp, then connect an OpenArx API token.
What does OpenArx do?
It gives an MCP client tools for paper search, document retrieval, evidence checks, methodology research, and navigation across a claim graph.
What is required to use OpenArx?
You need an API token from portal.openarx.ai. Research access uses https://mcp.openarx.ai/researcher/mcp.
