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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 v2.1.239 21 Aug 2026

Slack MCP sends render as their own tool row

You'll notice

Useful2 Signal3

MCP

Slack messages sent through MCP now show as a "Slacked" tool row, in verbose mode only.

What

Messages sent through the Slack MCP tool now display as a tool named "Slacked" instead of a raw MCP call, and only in verbose mode.

Details

Keyed on the tool name mcp-slack-send.
Ships with helpers that turn a Slack channel id into a https://slack.com/app_redirect?channel= link, so channels are clickable.
Outside verbose mode the tool-use row is hidden entirely.

Evidence

https://slack.com/app_redirect?channel=

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

See this entry in the whole of v2.1.239 →