How to support multiple Slack workspaces on MCP for Claude Code

🫧 Open on Bubbles Claude Code talks to Slack over MCP, but out of the box you only get 1 workspace. Here’s how to run 2 or more at once. The trick: every workspace beyond the first runs as its own token-based stdio MCP server. stdio servers don’t collide (more on why later), so they all load in every session. Grab your Slack tokens For each extra workspace, you need 2 values from a logged-in Slack web tab: xoxc : from localStorage , key localConfig_v2 . xoxd : the d cookie. It’s httpOnly, so read it from a