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Documentation 2026-05-26 18:54 UTC to 2026-05-27 00:57 UTC

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11- **Streamable HTTP servers**: Servers that you access at an address.11- **Streamable HTTP servers**: Servers that you access at an address.

12 - Bearer token authentication12 - Bearer token authentication

13 - OAuth authentication (run `codex mcp login <server-name>` for servers that support OAuth)13 - OAuth authentication (run `codex mcp login <server-name>` for servers that support OAuth)

14- **Server instructions**: Codex reads the MCP `instructions` field returned during initialization and uses it as server-wide guidance alongside the server’s tools.

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16If you build or maintain an MCP server for Codex, use `instructions` for cross-tool workflows, constraints, and rate limits that apply across the server. Keep the first 512 characters self-contained so the most important guidance is available when Codex is deciding how to use the server.

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15## Connect Codex to an MCP server18## Connect Codex to an MCP server

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