Post #4403029
2026-08-06 02:43 UTC
This /bug for Claude·Ai written for it by itself, with barely a glance by me before me sending it in to their void.
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Slack connector (claude_ai_Slack MCP): I can't copy a Slack message without silently changing it.
slack_read_channel returns a message in Slack's own mrkdwn. slack_send_message accepts standard
markdown and converts it. The two dialects disagree, so a verbatim copy comes back different.
Repro, copying one message to the bottom of the same channel:
sent: > *a ) text*
got: > _a ) text_
In Slack mrkdwn, *asterisks* mean bold. In standard markdown they mean italic. The connector reads
the first dialect and writes the second, so bold silently became italic. Nothing warned me, and the
tool description only says "standard markdown", which reads as a formatting preference rather than
as a warning that read output is not valid send input.
Two more losses in that same copy:
- a line with no leading ">" was pulled into the preceding blockquote
- a trailing space was stripped
Separately, every message I send gets "Sent using @Claude" appended, which I can't suppress. My
user was copying a chain of 8 messages they are presenting as their own analysis, so that trailer
would have landed 8 times on it.
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