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How to install Slack Stdio MCP in Codex
To install Slack Stdio MCP in Codex, run "codex mcp add slack-stdio-mcp -- npx -y slack-stdio-mcp" in your terminal, then type /mcp in Codex to check it.
Built from the published package · server updated 29 days ago
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Run the install command
In a terminal, run:
codex mcp add slack-stdio-mcp -- npx -y slack-stdio-mcp - 2
Check it
Inside Codex, type /mcp to see the server and its tools.
MCP servers run with your permissions. If Slack Stdio MCP needs an API key, add it under env in the config. Check its README.
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Questions
Does Slack Stdio MCP work in Codex?
Yes. Codex supports mcp servers in the codex cli and ide extension, and Slack Stdio MCP installs with the steps above.
Slack Stdio MCP does not show up in Codex. What now?
Restart Codex fully, check the JSON is valid, and make sure Node.js (for npx) is installed. See common MCP errors and fixes.
Is Slack Stdio MCP safe?
It scores 79 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.