# Keystone (remote · keystone-research.vercel.app)

What an arXiv paper builds on, disputes and assumes, read verbatim from its LaTeX. No LLM.

- Trust score: 66/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-24

## Components

- remote · `keystone-research.vercel.app`: 66/100 (this document), [markdown](https://verifymcp.io/servers/srikarmk-keystone/api-mcp.md), [page](https://verifymcp.io/servers/srikarmk-keystone/api-mcp)

## Channel facts

- Endpoint: `https://keystone-research.vercel.app/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-24.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 68/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 428 tokens (~142/item across 3 items; 3 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 13/100
  - Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 3 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the Keystone MCP server?

Keystone is a hosted endpoint at https://keystone-research.vercel.app/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http srikarmk-keystone 'https://keystone-research.vercel.app/api/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "srikarmk-keystone": {
      "url": "https://keystone-research.vercel.app/api/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "srikarmk-keystone": {
      "type": "http",
      "url": "https://keystone-research.vercel.app/api/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.srikarmk-keystone]
url = "https://keystone-research.vercel.app/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "srikarmk-keystone": {
      "type": "remote",
      "url": "https://keystone-research.vercel.app/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add srikarmk-keystone --url 'https://keystone-research.vercel.app/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  srikarmk-keystone:
    url: "https://keystone-research.vercel.app/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "srikarmk-keystone": {
      "Transport": "http",
      "Url": "https://keystone-research.vercel.app/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add srikarmk-keystone -t streamable-http -u 'https://keystone-research.vercel.app/api/mcp'
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-24 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-23 (score 65, 0)

- [security] Tool “search_library” rewrote its description, which is the text the model reads

### 2026-10-22 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-21 (score 64, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-20 (score 64)

First indexed and scored.

## MCP tools (3)

### `search_library` (~137 tokens)

Search what Keystone read

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 that decided it, and the work cited. Returns the sentence verbatim with a link to the exact line.

Input parameters:

- `limit` (integer): Default 15.
- `query` (string, required): Text to look for, e.g. 'layer normalization'
- `stance` (string): Optional filter. The first five are citation stances; bare/cited/shown are what an assumption's own sentence offers for it.

### `read_paper` (~129 tokens)

Read one paper's citations and assumptions

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 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.

Input parameters:

- `arxiv_id` (string, required): An arXiv id or link, e.g. 1706.03762
- `include` (string): Default all.

### `list_disagreements` (~68 tokens)

Where the library argues with itself

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.

Input parameters:

- `kind` (string): Default disputes.
- `limit` (integer): Default 40.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/srikarmk-keystone/api-mcp#diagnostics

## Score history

- 2026-10-24: 66
- 2026-10-23: 65
- 2026-10-22: 65
- 2026-10-21: 64
- 2026-10-20: 64

## Common questions

### What is the Keystone MCP server?

Keystone is an MCP server listed in the public MCP registry as io.github.Srikarmk/keystone. What an arXiv paper builds on, disputes and assumes, read verbatim from its LaTeX. No LLM. This page covers its hosted endpoint (https://keystone-research.vercel.app/api/mcp).

### Is the Keystone MCP server safe to use?

Keystone scores 66 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Keystone MCP server expose?

Keystone exposes 3 tools: search_library, read_paper, list_disagreements. Their descriptions and schemas cost roughly 334 tokens of context every time the server is loaded.

### Does the Keystone MCP server require authentication?

No. We connected to Keystone without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Keystone MCP server still maintained?

Keystone is still listed as active in the MCP registry. We last reached this channel on 24 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://keystone-research.vercel.app/api/mcp
- Repository: https://github.com/Srikarmk/Keystone
- Website: https://keystone-research.vercel.app/
- Changelog RSS feed: https://verifymcp.io/servers/srikarmk-keystone/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/srikarmk-keystone/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/srikarmk-keystone/api-mcp