plugin CX Codex GP ChatGPT official · OpenAI

slack — Codex plugin: work with Slack from your agent

Q: Why does a public OAuth client matter?

The `client_id` sits in `.mcp.json` in the open and no client secret ships with it. Anyone can copy the ID and impersonate the client in OAuth requests, so it does not prove where a request came from.

Connects Slack to Codex through a configured integration so the agent can read channels and threads. Useful when your team talks in Slack.

Open on GitHub

What slack does

The plugin gives the agent access to Slack via an integration you set up. Under the hood it ships an MCP config, .mcp.json, with an OAuth client_id published in the open. No client secret is included.

That makes it a public OAuth client. The ID can be copied to impersonate the client in OAuth requests, and it cannot prove a request came from this plugin. Access to a Slack account still needs user authorization, so nothing gets read until someone approves it.

If Slack is where your team makes decisions, this is a reason to look at how workspace access is handed out. Built for Codex and ChatGPT.

What it helps with

read a Slack channel discussion from the agent
find a specific thread in team chat
check what was agreed in chat against the code
pull context out of Slack without switching windows

Example prompts for the agent

show the latest messages in #general
find the Slack thread about the deploy and summarize it
what was posted in #backend today

Questions about slack

How do I install slack in Claude?

There is no install command for this plugin — add it through the Claude plugin interface and configure the Slack integration.

What does the slack plugin do?

It lets the agent work with Slack through a configured integration, reading channels and threads. Account access requires user authorization.

Why does a public OAuth client matter?

The client_id sits in .mcp.json in the open and no client secret ships with it. Anyone can copy the ID and impersonate the client in OAuth requests, so it does not prove where a request came from.

Source text

slack · MIT

# Slack

**Warning: this plugin is a public OAuth client.** Its OAuth `client_id` is
published in [`.mcp.json`](.mcp.json), and no client secret is included. The public
ID can be copied to impersonate the client in OAuth requests; it cannot prove
that a request comes from this plugin. Access to a Slack account still requires
user authorization.

For more context, see Okta's
[The Identity of OAuth Public Clients](https://developer.okta.com/blog/2022/06/01/oauth-public-client-identity).

slack-api slackapi Finds Slack Web API methods, reads their contracts, and prepares correct calls. Use it for OAuth scopes, cursor pagination, rate limits, and API error diagnosis. CX Codex +1 2,900installs connector-slack caffeinelabs A skill that gets your agent posting messages to a Slack channel from a Caffeine canister through the slack-client package. The recipe is marked experimental. CX Codex +1 14,300installs slack-expert VoltAgent Community This subagent builds Slack apps, connects Slack APIs, and reviews bot code for security. Use it when a project needs a Slack integration or audit. 246installs slack-search official anthropics This skill guides an agent through finding Slack messages, files, channels, and people. Use it to gather context or track down a specific conversation. CX Codex +1 3,200installs slack-messaging slackapi Guides AI agents when drafting, formatting, and scheduling messages sent through Slack MCP tools. Prevents broken formatting in channels and threads. CX Codex +1 2,900installs pp-slack Matt Van Horn This skill mirrors your Slack history into a local SQLite database with full-text search, so old messages stay reachable after Slack's retention window closes. CX Codex +1 373installs

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