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1password Codex Plugin

mcp-1password-1password-codex-plugin · by 1Password

A Codex plugin for the 1Password Developer Environments MCP server

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Install

$ agentstack add mcp-1password-1password-codex-plugin

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ✓ Network access No
  • ✓ Filesystem access No
  • ✓ Shell / process execution No
  • ● Environment & secrets Used
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

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Reliability & compatibility

✓ Security review passed
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Declared compatibility

Claude CodeClaude DesktopCursorWindsurf

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

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About

1Password Codex Plugin

This repository contains a Codex plugin that connects Codex to the 1Password desktop app's local MCP server for 1Password Developer Environments.

The plugin lets Codex help with secure project environment setup, such as listing Developer Environments, inspecting variable names, adding variables, and creating local .env mounts. Secret values remain controlled by 1Password and are never shared with Codex.

Note: This plugin currently only supports MacOS

Documentation

https://www.1password.dev/environments/mcp-codex-server

What's Included

  • plugins/1password/.codex-plugin/plugin.json - Codex plugin metadata and UI

configuration.

  • plugins/1password/.mcp.json - MCP server configuration for the 1Password

desktop app's bundled onepassword-mcp binary.

  • plugins/1password/skills/1password-environments/SKILL.md - Codex skill

instructions for using 1Password Developer Environments.

  • plugins/1password/assets/ - Plugin icon and logo assets.
  • .agents/plugins/marketplace.json - Local marketplace entry that points Codex

at plugins/1password.

Prerequisites

  • macOS with the 1Password desktop app installed.
  • 1Password Labs MCP server experiment enabled in the desktop app.
  • Access to a 1Password account with Developer Environments enabled.

The MCP server is expected at:

/Applications/1Password.app/Contents/MacOS/onepassword-mcp

Using the Plugin

Once installed or enabled in Codex, you can ask for tasks like:

  • "List my 1Password Environments"
  • "Create a local .env mount here"
  • "Show me the variable names in my project environment"
  • "Add a placeholder variable for my OpenAI API key"

The 1Password desktop app may prompt for approval when Codex connects to the MCP server or accesses an Environment.

Exposed MCP Tools

The plugin exposes these 1Password MCP tools to Codex:

  • authenticate
  • list_environments
  • create_environment
  • rename_environment
  • list_variables
  • append_variables
  • create_local_env_file
  • list_local_env_files

License

MIT. See [LICENSE](LICENSE).

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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