Does Codex support the Slack MCP server?

Yes. Codex connects to the Slack MCP server through one CLI command, pointed at your Metorial URL. You need the Codex CLI, IDE extension or ChatGPT desktop app.

Do I need an API key to connect Slack to Codex?

No. You sign in to Slack once through Metorial, and Codex uses that connection. No API keys go into Codex's settings.

Which Slack tools can Codex use?

All 48 Slack tools your team allows, such as Manage Pins, Manage Channel Members, Get User Info. Admins can narrow that list per team.

Can I control which teammates use Slack in Codex?

Yes. Role-based access control decides who can use Slack and which of its tools appear in Codex, and every call is logged with the person's identity.

What if Codex doesn't show Slack tools?

Codex can connect without credentials and then see nothing. Run codex mcp login metorial to complete the OAuth sign-in.

Connect Slack to Codex (MCP setup guide)

Ask Codex to use the manage user status tool in Slack
Ask Codex to use the search users tool in Slack
Ask Codex to use the search public and private content tool in Slack
Ask Codex to use the create canvas tool in Slack
Ask Codex to use the update user profile tool in Slack

1. Enable Slack in Metorial
In your Metorial portal, enable the Slack MCP server and sign in with the account that owns the data. Access stays governed by your team policies.
2. Add the server and sign in
The Codex CLI, IDE extension and ChatGPT desktop app share this config.
```
codex mcp add metorial --url <your-magic-mcp-url>
codex mcp login metorial
```
3. Check the connection
Type /mcp in Codex to see Metorial and its Slack tools.

Once Slack is enabled in Metorial, teammates sign in with SSO and get the same connection in Codex, with only the tools their role allows.

One link covers every app you approve. See how the MCP gateway handles access, roles and audit logs for the whole company.

Manage Pins: Pin or unpin messages in a Slack channel, or list all pinned items.
Manage Channel Members: Invite users to or remove users from a Slack channel.
Get User Info: Look up a Slack user's profile and status.
Get Team Info: Retrieve information about the Slack workspace (team), including its name, domain, email domain, and icon.
Manage User Groups: Create, update, enable, disable, or list user groups (also known as @mention handle groups) in Slack.
Send Message: Send a message to a Slack channel, group DM, or direct message conversation.
Schedule Message: Schedule a message to be sent to a Slack channel at a future time.
Manage Reminders: Create, complete, delete, or list Slack reminders.
Manage Channel: Create, update, archive, unarchive, or configure a Slack channel.
Get Conversation History: Retrieve message history from a Slack channel, DM, or group DM.
Manage Bookmarks: Add, edit, remove, or list bookmarks (saved links) in a Slack channel.
Manage Files: Upload, list, get info about, or delete files in Slack.
Update Message: Update or delete an existing Slack message.
Manage Reactions: Add, remove, or list emoji reactions on a Slack message.
Search Messages: Search messages across a Slack workspace with Real-time Search using keywords or a natural-language question.
And 33 more on the Slack MCP server page.

Limit which Slack tools Codex sees with enabled_tools and disabled_tools on the metorial server in config.toml.
Set default_tools_approval_mode to auto, prompt, writes or approve. writes prompts only for tools that are not marked read-only.
Type /mcp in the composer to see the connected servers.
Override the approval behavior for a single Slack tool with tools.<tool>.approval_mode.

Metorial is listed but tools are missing: Codex can connect without credentials and then see nothing. Run codex mcp login metorial to complete the OAuth sign-in.
Metorial times out at startup: Codex waits 10 seconds by default. Raise startup_timeout_sec under [mcp_servers.metorial] in ~/.codex/config.toml.
Long tool calls fail after a minute: The default tool timeout is 60 seconds. Raise tool_timeout_sec for the metorial server in config.toml.

Based on the Codex MCP documentation.

Frequently asked questions

Common questions about connecting Slack to AI agents with Metorial.

Does Codex support the Slack MCP server?
Yes. Codex connects to the Slack MCP server through one CLI command, pointed at your Metorial URL. You need the Codex CLI, IDE extension or ChatGPT desktop app.
Do I need an API key to connect Slack to Codex?
No. You sign in to Slack once through Metorial, and Codex uses that connection. No API keys go into Codex's settings.
Which Slack tools can Codex use?
All 48 Slack tools your team allows, such as Manage Pins, Manage Channel Members, Get User Info. Admins can narrow that list per team.
Can I control which teammates use Slack in Codex?
Yes. Role-based access control decides who can use Slack and which of its tools appear in Codex, and every call is logged with the person's identity.
What if Codex doesn't show Slack tools?
Codex can connect without credentials and then see nothing. Run codex mcp login metorial to complete the OAuth sign-in.