diff --git a/README.md b/README.md
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+++ b/README.md
@@ -2858,6 +2858,7 @@ Tools for conducting research, surveys, interviews, and data collection.
 - [smaniches/semantic-scholar-mcp](https://github.com/smaniches/semantic-scholar-mcp) [![smaniches/semantic-scholar-mcp MCP server](https://glama.ai/mcp/servers/smaniches/semantic-scholar-mcp/badges/score.svg)](https://glama.ai/mcp/servers/smaniches/semantic-scholar-mcp) 🐍 🏠 ☁️ 🍎 🪟 🐧 - Semantic Scholar MCP server: 14 typed tools over 200M+ academic papers — search, paper/author retrieval, citation-graph traversal, and recommendations. `uvx s2-mcp-server`
 - [thinkchainai/agentinterviews_mcp](https://github.com/thinkchainai/agentinterviews_mcp) - Conduct AI-powered qualitative research interviews and surveys at scale with [Agent Interviews](https://agentinterviews.com). Create interviewers, manage research projects, recruit participants, and analyze interview data through MCP.
 - [vassiliylakhonin/agenda-intelligence-md](https://github.com/vassiliylakhonin/agenda-intelligence-md) [![vassiliylakhonin/agenda-intelligence-md MCP server](https://glama.ai/mcp/servers/vassiliylakhonin/agenda-intelligence-md/badges/score.svg)](https://glama.ai/mcp/servers/vassiliylakhonin/agenda-intelligence-md) 🐍 🏠 - Auditable strategic-risk memos for AI agents — sanctions, regulatory, geopolitics, trade. Geography-routed regional specialists (Central Asia/Caspian, Gulf/Middle East), per-claim evidence discipline, schema-validated output, machine-verified audit. No live data retrieval. PyPI: `agenda-intelligence-md`.
+- [wedo911/citeguard](https://github.com/wedo911/citeguard) 🐍 📇 🏠 - Check a citation against Crossref for retraction, correction, or expression-of-concern status before it goes into a paper, summary, or review — catches papers like Wakefield's retracted MMR-autism study, still cited 1,000+ times since its 2010 retraction. No API key required. Detection logic (checked against real Crossref data, not just documentation) is shared identically between a Python CLI/library, this MCP server, and a GitHub Action for CI.
 - [WenyuChiou/research-hub](https://github.com/WenyuChiou/research-hub) [![WenyuChiou/research-hub MCP server](https://glama.ai/mcp/servers/WenyuChiou/research-hub/badges/score.svg)](https://glama.ai/mcp/servers/WenyuChiou/research-hub) 🐍 🏠 ☁️ 🍎 🪟 🐧 - Research workspace MCP integrating Zotero, Obsidian, and NotebookLM. Search papers (arXiv/Semantic Scholar/PubMed/CrossRef), ingest into Zotero, sync notes to Obsidian, verify NotebookLM briefs. All three external tools optional. `pip install research-hub-pipeline` then `research-hub serve`.
 - [xmpuspus/ph-civic-data-mcp](https://github.com/xmpuspus/ph-civic-data-mcp) [![xmpuspus/ph-civic-data-mcp MCP server](https://glama.ai/mcp/servers/xmpuspus/ph-civic-data-mcp/badges/score.svg)](https://glama.ai/mcp/servers/xmpuspus/ph-civic-data-mcp) 🐍 ☁️ 🍎 🪟 🐧 - Philippine government data as agent-callable tools: PHIVOLCS earthquakes + volcano alerts, PAGASA weather + typhoons, PhilGEPS procurement, PSA 2020 Census population + poverty, AQICN air quality. Install: `uvx ph-civic-data-mcp`.
 - [YGao2005/scholar-feed-mcp](https://github.com/YGao2005/scholar-feed-mcp) [![YGao2005/scholar-feed-mcp MCP server](https://glama.ai/mcp/servers/YGao2005/scholar-feed-mcp/badges/score.svg)](https://glama.ai/mcp/servers/YGao2005/scholar-feed-mcp) 📇 ☁️ - Semantic search over 600k+ CS/AI papers with citation-graph traversal, full-text extraction, embeddings, and BibTeX export. Works anonymously or with a free key. Install: `npx scholar-feed-mcp init`.