Open Arx MCP Server

AI-native infrastructure for scientific and engineering knowledge. OpenArx is a knowledge layer for LLM agents - not a web app for humans. Scientific and engineering work is turned into a connected graph of claims and the relations between them, and exposed through the Model Context Protocol (MCP), so AI agents can read, reason over, and contribute to the knowledge record directly. Its 35 documented tools cover methodist, document, semantic, related. It is available as a remote MCP endpoint.

Teams that want a hosted endpoint instead of running a local process. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-07-30 · ★ 8 · #698 OF 848 MAINTAINED OTHER · VERIFIED 2026-08-25

Apache-2.0 · TypeScript servers · how we verify → /methodology

01 · Install Open Arx

Claude Code

claude mcp add openarx-ai-openarx-core --transport http https://mcp.openarx.ai/researcher/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "openarx-ai-openarx-core": {
      "url": "https://mcp.openarx.ai/researcher/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://mcp.openarx.ai/researcher/mcp

transport: streamable-http

endpoint alive - authentication required · probed 2026-08-25

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as remote - your agent's requests go to mcp.openarx.ai

endpoint auth requires authentication - rejected our unauthenticated MCP initialize

license Apache-2.0 - declared in the repository

registry vendor namespace ai.openarx - domain-verified with the official MCP registry

03 · What Open Arx can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

With this server connected, an agent can find related papers by similarity, by entity, or by concept, check a claim against the corpus and group passages by what supports, contradicts, or is neutral, map the conceptual landscape around a topic across the paper corpus, and find methodology approaches for a specific research task.

Capability map

Tools grouped from the project's README - what Open Arx lets an agent do.

read & search

11 tools - e.g. Hybrid semantic and keyword search across scientific papers.; Pure keyword (BM25) search, fastest option for exact-term lookups.; Pure vector search, best for paraphrased queries and concept exploration.

search · search_keyword · search_semantic · find_evidence · find_methodology · find_benchmark_results…

Methodist

11 tools - e.g. Read one published claim, relation, activity, metric or bundle by id.; The relations of a claim, plus the records at the far end of them.; Keyword search over published claims.

methodist_get · methodist_find · methodist_search · methodist_search_semantic · methodist_explore_topic · methodist_traverse…

Document

4 tools - e.g. Retrieve full paper details by ID.; Submit a document for indexing.; Check the processing status of a submitted document.

get_document · submit_document · get_document_status · get_my_document_review

2 tools - e.g. Find related papers by similarity, by entity, or by concept.; Find claims related to an existing claim by that claim's stored vectors.

find_related · find_related_claims

Draft

2 tools - e.g. Create an editable draft in the Portal instead of publishing immediately.; Publish a draft the agent itself authored.

create_draft · publish_draft

create & write

2 tools - e.g. Publish a new version of an existing document.; Request a short-lived presigned URL for uploading content.

create_new_version · create_upload_url

Paginate

1 tool - e.g. Continue a previous search from its cached candidate pool instead of re-running it.

paginate

Compare

1 tool - e.g. Side-by-side comparison of several papers.

compare_papers

Latest releases

v0.5.0 · 2026-07-30

[0.5.0] - 2026-07-30 · Public Alpha. This release replaces the second embedding model, moves every model · call to a single provider, and makes several read surfaces state plainly when they · have not measured…

v0.4.0 · 2026-07-18

Reproducible, non-polluting methodology runs. Per-stage guidance becomes deterministic, synthesis stops duplicating claims, and a research run is only created once it has a valid diagnosis. · Deterministic per-stage…

v0.3.0 · 2026-07-15

[0.3.0] - 2026-07-16 · Deeper graph reads and safer contribution. The methodology surface gains richer, · de-duplicated ways to read the Layer 2 graph, run completion becomes a durable fact, · and ingest learns the…

04 · Who maintains Open Arx

OpenArx is maintained by openarx-ai. It's the only MCP server we track from this author; the repo dates to May 2026.

05 · Facts

repository: github.com/openarx-ai/openarx-core
website: https://openarx.ai/
category: other - ranked #698 of 848 actively-maintained other servers as of 2026-08-25.
release cadence: 6 releases in the last 90 days (latest 2026-07-30)
registry: ai.openarx/openarx (active, first published 2026-05-12 · 4 versions)

06 · Open Arx FAQ

Is Open Arx still maintained?

Yes - as of 2026-08-25, its last commit was 2026-07-30 and it shipped 6 releases in the last 90 days. We re-verify nightly.

What can Open Arx do?

How do I install Open Arx?

Run `claude mcp add openarx-ai-openarx-core --transport http https://mcp.openarx.ai/researcher/mcp`. You can also paste the ready-made client config above.

Does Open Arx require authentication?

Yes - when we probed the endpoint on 2026-08-25, it rejected an unauthenticated MCP initialize; you'll need credentials to connect.

07 · Alternatives to Open Arx

Alternatives to Open Arx

Maintained other servers if Open Arx isn't the fit.

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