Keystone
What an arXiv paper builds on, disputes and assumes, read verbatim from its LaTeX. No LLM.
Use arXiv with: ChatGPT · Claude · Cursor · Claude Code · VS Code
Connect it
Settings → Connectors → Add custom connector
URL: https://keystone-research.vercel.app/api/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://keystone-research.vercel.app/api/mcp{
"mcpServers": {
"keystone": {
"url": "https://keystone-research.vercel.app/api/mcp"
}
}
}claude mcp add --transport http keystone https://keystone-research.vercel.app/api/mcp{
"servers": {
"keystone": {
"type": "http",
"url": "https://keystone-research.vercel.app/api/mcp"
}
}
}3 tools, pulled live
search_librarySearch 2497 readings taken from 234 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. Returns the sentence verbatim with a link to the exact line.
read_paperEverything 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 source — one outside the library is parsed on demand, which takes a few seconds. Nothing is summarised or inferred; every line is the paper's own.
list_disagreementsEvery 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.
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