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Sets the read cursor in a channel.

An MCP tool from the Slack API server, hosted on mcp.hjlabs.in.

Sets the read cursor in a channel. [POST /conversations.mark]

Name on the gateway: slack_api__conversations_mark · may change things.

Parameters

NameTypeDescription
channelstringChannel or conversation to set the read cursor for.
tsnumberUnique identifier of message you want marked as most recently seen in this…

How to call it

Through the Smart Gateway, any client can run it by name with call_tool, or let the gateway find it with search_tools:

call_tool arguments
{
  "name": "slack_api__conversations_mark",
  "arguments": {}
}

Or connect the Slack API server directly, which lists 174 tools including this one:

Run in your terminal
claude mcp add --transport http hj-slack-api https://mcp.hjlabs.in/mcp/slack-api \
  --header "Authorization: Bearer YOUR_API_KEY"

Try asking

Use the sets the read cursor in a channel. tool with channel set to ….

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