Best MCP Servers for Codex

Codex can connect to Model Context Protocol (MCP) servers for extra tools. Choose an integration that fills a gap in your existing development workflow, and begin with a test workspace and one narrow capability rather than broad access to a large tool collection.

Avoid overlapping access

Check what your host already supports before adding a Git or file-access server. The reference servers make their source inspectable; they are not a requirement for every project.

Review configuration and credentials

Use the current Codex MCP documentation to check supported configuration and authentication. AgentSkillsDir has not run these servers in your environment; verify a harmless read operation before allowing changes.

Add project context or team messaging

Graphicle documents a Codex connection for repository graph and memory lookup. Reason Network documents Codex support for team-session discovery and messages. Both can change local client configuration or hooks; review those changes before connecting them.

FAQ

How do I add an MCP server to Codex?

Register it in the Codex MCP configuration, following the current Codex MCP documentation. Check which transport and authentication the server needs before you add it.

Which MCP servers work with Codex?

Any MCP server that uses a transport Codex supports. This guide lists the Git, Filesystem and Memory reference servers plus Graphicle and Reason Network, which document Codex support; none has been integration-tested by AgentSkillsDir.

Do I need a Git MCP server in Codex?

Not always. Codex can already run git commands in your workspace; a Git MCP server adds structured repository tools. Check what your host already supports before adding overlapping access.

Reference: https://developers.openai.com/codex/mcp

These selections are organized by task, without invented ratings, search volumes or compatibility-test results.