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Webcite MCP Server

Verify claims against authoritative sources, trace quotations to passages, and extract document figures through MCP.

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Install Webcite MCP Server

Pick your client, then add it in one click or paste the config.

STDIONode.js
~/Library/Application Support/Claude/claude_desktop_config.json
claude_desktop_config.json
{
  "mcpServers": {
    "webcite-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "webcite-mcp-server"
      ]
    }
  }
}

Settings → Developer → Edit Config, merge this into mcpServers, then fully quit and reopen Claude Desktop.

We couldn’t confirm it starts correctly

The install command installed and started the server, which then stopped for configuration (such as an API key) that our sandbox does not have — expected for servers that connect to your account.

npx -y webcite-mcp-server

No response to initialize.

This is an experimental automated check and can have false negatives — missing environment variables, a slow cold install, etc. It doesn’t necessarily mean something’s wrong. Last checked Today.

Overview

webcite-mcp-server connects MCP-compatible agents to WebCite workflows for checking factual claims against authoritative sources and tracing quoted material to its source passage. It also supports deterministic figure extraction from original images, PDFs, and PowerPoint files, with review and citation workflows for uploaded content. The hosted Streamable HTTP endpoint is available at https://api.webcite.co/mcp, with connection guidance at https://webcite.co/connect. Reach for it when an agent needs evidence-backed verification or structured document review rather than relying only on generated text.

Use cases

  • Verify claims against official publications
  • Trace quoted text to source passages
  • Extract figures from uploaded reports and presentations
  • Review document coverage and unreadable regions
  • Constrain verification to approved domains

Key features

  • Authoritative-source claim verification
  • Streaming verification with verify_claim_stream
  • Passage-bound quotation citations
  • Deterministic document figure extraction
  • Public HTTPS upload workflow
  • Official-source and domain filters

Security & health

What it can reach and how reliably it runs — from our own checks, not the maintainer’s claims.

ActiveLast checked Today

Recent health check succeeded.

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

Critical 0High 0Medium 0Low 0

Scanned 17h ago via OSV.dev · webcite-mcp-server (npm)

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

npm downloads1kPackage downloads in the last 30 days.
Last commit10d agoMost recent push to the default branch.
Install checkRunsOur sandbox started it; it then asked for an API key or config.

How Webcite MCP Server works

What webcite-mcp-server does

webcite-mcp-server exposes WebCite capabilities through the Model Context Protocol. Its primary use is claim verification: an agent can submit a factual claim and receive evidence from authoritative publications, with quotations associated with the passages they came from. The workflow can be constrained with source requirements such as an official country, primary-source status, or an approved domain.

The server also supports document-oriented review. Original image, PDF, or PowerPoint bytes can be uploaded for parsing, after which an agent can inspect coverage, unreadable areas, claim limits, and source or page locators. This is intended for extracting and checking figures from source documents, not for assuming that a completed upload or review captured every value.

How it works

The hosted MCP endpoint is a Streamable HTTP service at https://api.webcite.co/mcp. A client can be pointed to that endpoint using the connection flow at https://webcite.co/connect. The remote service uses the public profile for supported public API workflows.

Claim verification can use verify_claim or verify_claim_stream. Official-source constraints belong in the request’s filters; known public HTTPS reports can be supplied through source_urls. A URL or site: expression written inside the claim does not replace those request fields.

For remote retrieval, upload_url can obtain bounded original bytes from a public HTTPS URL, subject to public-address and redirect checks, and return asset references. Uploaded material should be parsed before review. Verification and extraction operations can be long-running, so saved review, citation, job, and operation IDs are useful when a request times out or produces an uncertain result.

Setup and configuration

Use an MCP client that supports the hosted Streamable HTTP transport and configure it with https://api.webcite.co/mcp. The published package and the hosted API are separate deployments: installing or publishing the package does not deploy the hosted service, frontend, or MCP binary.

Local SDK and self-hosted MCP requests use a 15-minute default headers-and-body timeout. WEBCITE_API_TIMEOUT_MS can override that value when a different timeout is needed. The hosted endpoint and self-hosted deployment should be treated as separate serving identities when checking available behavior.

Tools and capabilities

  • Verify factual claims against authoritative sources.
  • Stream claim-verification results with verify_claim_stream.
  • Apply official-source and domain filters to verification requests.
  • Associate quotations with their originating source passages.
  • Upload bounded source content from public HTTPS URLs with upload_url.
  • Review figures in images, PDFs, and PowerPoint documents with source and page locators.

Limitations and notes

Evidence retrieval is bounded and does not guarantee exhaustive source coverage. A search with no evidence does not establish that the information is unavailable. An extraction failure remains a failure, and a successful upload, completed review, or large citation set does not certify that every figure was read or verified.

For uploaded slides, citation links do not guarantee pixel-level highlighting. Review the original publisher passage before treating a verification stance as proof. When a request times out or its result is uncertain, retain the associated identifiers, read retained progress before retrying, and reuse an idempotency key only for the same request.

Read the full README View source on GitHub

Reviews

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Frequently Asked Questions about Webcite MCP Server

webcite-mcp-server is an MCP server that connects AI agents to WebCite for checking factual claims against authoritative sources, associating quotations with their originating passages, and extracting figures from documents. Its main workflows include verify_claim, verify_claim_stream, and hosted upload_url support for bounded original-file retrieval.

Connect an MCP-compatible client to https://api.webcite.co/mcp using the Streamable HTTP transport. The service uses the public profile for supported public workflows, and https://webcite.co/connect provides the starting point for setup.

Yes, webcite-mcp-server works with Cursor because the server supports MCP-compatible clients. The hosted connection uses the Streamable HTTP endpoint at https://api.webcite.co/mcp.

Use verify_claim or verify_claim_stream with filters such as official_country, is_primary_source, or domain. Supply known public HTTPS reports through source_urls, and match the requested metric, period, geography, currency, and scale to the evidence.

Upload original image, PDF, or PowerPoint content and wait for parsing before review. For public HTTPS files, upload_url can retrieve bounded original bytes and return asset references; inspect coverage and unreadable regions before relying on extracted figures.

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