The 10 Best MCP Servers for OpenAI Codex in 2026

A guide to MCP servers for Codex explains that Codex in 2026 supports both stdio and Streamable HTTP connections, including bearer-token and OAuth authentication, but not SSE or WebSocket transports, and emphasizes that outdated configuration advice can cause connection failures. It recommends Bright Data for protected web scraping and structured web data, Context7 for version-specific documentation, GitHub for repository workflows, Chrome DevTools for browser diagnostics, Serena for language-server-based code navigation, Sentry for production incident context, Postgres MCP Pro for database performance analysis, Playwright for browser automation, Figma for design metadata, and Linear for issue-tracking context. It cautions that every enabled server adds startup time, tool definitions, context consumption, and potential security exposure, advocating narrow tool allow lists, approval controls, output token limits, and longer startup timeouts where necessary. The guide advises against filesystem, Slack, and a community Atlassian MCP server because of redundancy, authentication limitations, or cited security vulnerabilities, and recommends validating servers individually through Codex’s MCP status command while treating each integration as having its own credentials and network access risks.

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