Keystone
What an arXiv paper builds on, disputes and assumes, read verbatim from its LaTeX. No LLM.
What it does
Keystone is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.
No capability identified yet from its description.
Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence) and are not a test of the tool.
At a glance
How to connect
As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 2h ago (live check)Hosted endpoint
https://keystone-research.vercel.app/api/mcpstreamable-http
In Claude Code: claude mcp add --transport http keystone https://keystone-research.vercel.app/api/mcp
MCP settings (Claude Desktop, Cursor and other MCP clients)
{
"mcpServers": {
"keystone": {
"url": "https://keystone-research.vercel.app/api/mcp"
}
}
}Live check
Electra Index connected to the hosted endpoint 2h agoONLINE Keystone answered an MCP connection on 20 Oct 2026 and introduced itself as keystone 0.1.0 (MCP protocol 2025-06-18).
3 tools offered to AI assistants
search_library· Search 2118 readings taken from 197 arXiv papers' LaTeX source: citation stances (adopts, extends, disputes, measures against) and stated assumptions. Matches on the quoted sentence, the cue phrase that decided it, and the work cited. Returread_paper· Everything Keystone reads out of one arXiv paper: what it adopts, extends, disputes and measures against, and the assumptions it states with a citation, its own evidence, or nothing at all. Works for any paper on arXiv that ships LaTeX sourlist_disagreements· Every sentence in the library where a paper says prior work is wrong, or puts itself beside it to win. Small on purpose — disagreement is rare and concentrated, and the whole set is readable.
What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method
Facts & evidence
Each fact shows where it was seen and when.| Fact | Value | Evidence | Source | Last confirmed |
|---|---|---|---|---|
| Hosted endpoint | https://keystone-research.vercel.app/api/mcp | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Local install (package) | no | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Remote access (hosted) | yes | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Website | https://keystone-research.vercel.app | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Repository | https://github.com/Srikarmk/Keystone | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Registry status | active | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Version | 0.1.0 | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| MCP server | yes | DECLARED | SRC-001 Official MCP Registry | 2h ago |
Change history
- NEW20 Oct 2026first seen in the index
Is this page accurate?
Flag it and our robot re-checks the official source. Reports never change a score.Is Keystone still online?
Free alerts · no accountQuestions about Keystone
How do I connect Keystone?
Use the hosted endpoint https://keystone-research.vercel.app/api/mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.
What tools does Keystone offer?
When Electra Index connected on 20 Oct 2026, it listed 3 tools: search_library, read_paper, list_disagreements. The full list is in "Live check" above.
Is Keystone online?
Yes. Its hosted endpoint answered an MCP connection from Electra Index 2h ago.