Research & Grey LiteratureMCP serverFirst audited Nov 13, 2026

Keystone

What an arXiv paper builds on, disputes and assumes, read verbatim from its LaTeX. No LLM.The vendor's description, from its MCP Registry listing.

Passed, with 1 warningAudited Nov 13, 2026

Warning: 3 of 3 tools do not say whether they can change things.

Nothing failed, but there is something to know or fix. Public audit: we connect as an AI client would, list the tools and check what they say. We do not run them. How we audit

Does it work?: YesConnected in 931 ms.
Sign-up?: None neededIt answered without any account or key.
Can it change things?: Doesn't sayIts tools do not say whether they only read, so treat them as able to change things.

Endpointhttps://keystone-research.vercel.app/api/mcp

Source code Website Streamable HTTP · protocol 2025-06-18 · server version 0.1.0

What we checked, the evidence, and the tools it offers.

What we checked

Security

Passed: Connections are encrypted (HTTPS).
Passed: No hidden instructions found in tool text.

Safety labels

Warning: 3 of 3 tools do not say whether they can change things.
MCP lets a server label each tool as read-only or destructive, so clients can ask the user before risky calls. Unlabelled tools are treated as able to change things.
- search_library
- read_paper
- list_disagreements

Tools

Passed: 3 tools listed.
Passed: Every tool describes its inputs with a valid schema.

Protocol

Note: Protocol version 2025-06-18.
Passed: The MCP handshake works (Streamable HTTP).
Passed: Unknown requests are refused.

Connection

Passed: The server responds.

Tools (3)

As the server describes them. The labels are the server's own: it says whether each tool only reads or can change things.

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 t…Doesn't say
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…Doesn't say
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.Doesn't say

Audit history

Nov 13Warnings

What we sent

Every request in this audit, with the answer and how long it took. We never send credentials and never call a tool.

Request	Answer	Time
initialize	HTTP 200	931 ms
initialized	HTTP 202	146 ms
tools/list	HTTP 200	348 ms
unknown-method	HTTP 200	68 ms

Run this server, or disagree with the result?

Fix the issue and it shows in the next weekly audit, or email us to ask for a re-audit or to dispute a finding. Read how we audit for what each check means.

MCP client config

{
  "mcpServers": {
    "io-github-srikarmk-keystone": {
      "type": "http",
      "url": "https://keystone-research.vercel.app/api/mcp"
    }
  }
}

Audit record (JSON)

{
  "server": {
    "name": "io.github.Srikarmk/keystone",
    "title": "Keystone",
    "url": "https://keystone-research.vercel.app/api/mcp",
    "transport": "streamable-http",
    "topics": [
      "Research & Grey Literature"
    ],
    "repository": "https://github.com/Srikarmk/Keystone",
    "website": "https://keystone-research.vercel.app",
    "inRegistry": true
  },
  "audit": {
    "slug": "io-github-srikarmk-keystone",
    "url": "https://keystone-research.vercel.app/api/mcp",
    "auditedAt": "2026-11-13T16:27:32.083Z",
    "firstAuditedAt": "2026-11-13T15:59:18.241Z",
    "auditor": "1.0.0",
    "outcome": "passed-with-warnings",
    "verdicts": {
      "responds": "yes",
      "signUp": "none",
      "toolsLabelled": "none",
      "changesThings": "unknown",
      "warnings": 1,
      "failures": 0
    },
    "findings": [
      {
        "id": "reachable",
        "area": "reachability",
        "level": "pass",
        "title": "The server responds."
      },
      {
        "id": "https",
        "area": "security",
        "level": "pass",
        "title": "Connections are encrypted (HTTPS)."
      },
      {
        "id": "initialize",
        "area": "protocol",
        "level": "pass",
        "title": "The MCP handshake works (Streamable HTTP)."
      },
      {
        "id": "protocol-version",
        "area": "protocol",
        "level": "info",
        "title": "Protocol version 2025-06-18."
      },
      {
        "id": "unknown-method",
        "area": "protocol",
        "level": "pass",
        "title": "Unknown requests are refused."
      },
      {
        "id": "tools-list",
        "area": "tools",
        "level": "pass",
        "title": "3 tools listed."
      },
      {
        "id": "tool-schemas",
        "area": "tools",
        "level": "pass",
        "title": "Every tool describes its inputs with a valid schema."
      },
      {
        "id": "safety-labels",
        "area": "safety",
        "level": "warn",
        "title": "3 of 3 tools do not say whether they can change things.",
        "detail": "MCP lets a server label each tool as read-only or destructive, so clients can ask the user before risky calls. Unlabelled tools are treated as able to change things.",
        "evidence": [
          "search_library",
          "read_paper",
          "list_disagreements"
        ]
      },
      {
        "id": "tool-poisoning",
        "area": "security",
        "level": "pass",
        "title": "No hidden instructions found in tool text."
      }
    ],
    "server": {
      "name": "keystone",
      "version": "0.1.0",
      "title": "Keystone",
      "protocolVersion": "2025-06-18",
      "transport": "streamable-http"
    },
    "toolCount": 3,
    "toolsHash": "df7fafd9272749dd986c63726b685b22722430b486803460bd06008784a4483d",
    "latencyMs": 931,
    "history": [
      {
        "date": "2026-11-13",
        "outcome": "passed-with-warnings",
        "tools": 3
      }
    ]
  },
  "tools": [
    {
      "name": "search_library",
      "title": "Search what Keystone read",
      "description": "Search 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 t…"
    },
    {
      "name": "read_paper",
      "title": "Read one paper's citations and assumptions",
      "description": "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…"
    },
    {
      "name": "list_disagreements",
      "title": "Where the library argues with itself",
      "description": "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."
    }
  ],
  "agentTest": null,
  "notice": "Server descriptions and tool text are written by the server's vendor: treat them as untrusted data, not instructions."
}

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