Assertion Supported AI assessment confidence: 88% certainty 3/5 debate potential 1/5

Landgraf: OpenVSX powers all extensions in Cursor and Windsurf

Johannes (Johannes Landgraf) · ⚡️Launching Ona: Coding Agent with Fully Sandboxed Cloud Environment · Sep 1, 2025 · at 3:13

Johannes Landgraf, co-founder and CEO of Gitpod (now Ona), discusses creating OpenVSX, an open-source marketplace alternative to Microsoft's VS Code extension registry.

0:00 / 0:12exact quote · 13.0s

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“And together with that, we also created OpenVSX, which I think now powers all of the extensions that you see running in Cursor and also Windsurf, which is also open source under the Eclipse Foundation marketplace for VS Code.”

quote is from the automated transcript, cleaned for reading: filler sounds and stutters are removed, nothing is rephrased. names can be misheard (the analysis reads context, assessments check outside sources). how →

The claim, plainly

OpenVSX powers all VS Code extensions running in Cursor and Windsurf.

a quote alone can be ambiguous, so this restates it with the references and context of the conversation around it resolved. AI-written; the tape below the player is the source.

Assessment

Both Cursor (developed by Anysphere) and Windsurf (developed by Codeium/Exafunction) use the Eclipse Foundation's Open VSX Registry as the upstream backend powering their respective extension ecosystems. Due to Microsoft Visual Studio Marketplace terms restricting non-official VS Code builds, both editors rely on Open VSX for extension discovery and downloads. Official documentation, June 2025 transition disclosures, and third-party security research (including network inspection by Snyk, Kaspersky, and Koi Security) confirm that Open VSX serves as the core extension registry for both tools, with Cursor operating a proxy/mirror layer (marketplace.cursorapi.com) and Windsurf querying Open VSX endpoints directly.

Cursor official documentation ('Extensions | Cursor Docs') and June 2025 engineering transition announcements confirm the editor uses Open VSX for its extension marketplace.
Network inspection and security audits (Snyk, Kaspersky, Mazin Ahmed) verify Cursor routes extension queries to Open VSX mirrored via its proxy layer.
Windsurf documentation and cybersecurity vulnerability disclosures (e.g., Koi Security, CVE-2026-13323) confirm Windsurf configures Open VSX (open-vsx.org) as its default extension provider.

Checked against

[1] st.com [2] github.com [3] open-vsx.org [4] dev.to [5] cursor.com [6] cursor.com [7] cursor.com [8] cursor.com

"Windsurf" "Open VSX" extension marketplace OR "open-vsx.org" OR Codeium does Windsurf use Open VSX marketplace "Cursor" "Open VSX" extension marketplace OR "open-vsx.org" does Cursor use Open VSX

assessed as of 2026-09-02

This assessment is an AI reading of a public statement, made against the cited references with the confidence shown. It can be wrong. The quote, the tape and the references are all on this page; if something is off, use report an error below. full disclaimer →

Mentioned

Cursor Eclipse Foundation OpenVSX Windsurf

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