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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.86 27 Mar 2026

Slack Channel Autocomplete

What

When a connected Slack MCP server is detected, Claude Code now offers channel autocomplete with #channel-name syntax.

Details

Automatically discovers connected Slack MCP servers
Searches for channels using the Slack MCP tool (supports public and private channels)
Parses channel names from MCP tool responses and provides autocomplete suggestions
Channel references use the #channel-name format in the input

Evidence

Slack channel integration (search for "Failed to fetch Slack channels") — AQK() at line ~592144

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.86 →