diff --git a/README.md b/README.md
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+++ b/README.md
@@ -301,6 +301,7 @@ Third-party plugins built by the community. [PRs welcome](#contributing)!
 - [Langfuse Observability](https://github.com/avivsinai/langfuse-mcp) - Query traces, debug exceptions, analyze sessions, and manage prompts via MCP tools.
 - [Launch Fast](https://github.com/BlockchainHB/launchfast_codex_plugin) - Official Launch Fast plugin adapter for rapid SaaS deployment.
 - [LinkedIn Skills](https://github.com/sergebulaev/linkedin-skills) - Codex-ready LinkedIn marketing bundle with a native .codex-plugin manifest and 10 skills: post writing with 16 tested hook formulas, AI-tell humanizer, pre-publish audit, comment and reply drafting, hook extraction, content planning, profile optimization, engager analytics, and thread monitoring; also works in Claude Code.
+- [X (Twitter) Skills](https://github.com/sergebulaev/x-skills) - Codex-ready X (Twitter) marketing bundle with a native .codex-plugin manifest: tweet and thread writing with corpus-validated hook formulas (validated against ~450 top tweets), AI-tell humanizer, hook extraction, reply drafting, content planning, and audience insights; also works in Claude Code.
 - [Maestro: Costguard](https://github.com/mbanderas/costguard) - Cost auditor for Codex that flags CI/cron and cloud-spend waste via read-only provider checks, then previews and applies surgical CI workflow fixes locally without writing to provider accounts or pushing git.
 - [Mantis](./plugins/deonmenezes/mantishack) - Autonomous bug bounty hunter for authorized engagements — 7-phase FSM (RECON → AUTH → HUNT → CHAIN → VERIFY → GRADE → REPORT), parallel hunter sub-agents, cryptographic scope enforcement, and BLAKE3/Ed25519 Merkle event logs.
 - [MATLAB Simulink Tools](https://github.com/summer521521/MATLAB_Simulink_plugin) - Connects Codex to MATLAB and Simulink through a local MCP server for model inspection, script execution, and engineering workflow automation.