Feature: Add `unfurl_links` and `unfurl_media` parameters to `slack_send_message`

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#38 1 comment 0 reactions 2 assignees View on GitHub

@manucaicedo is already working on this.

Since May 5, 2026.

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Description

enhancement
Problem

slack_send_message doesn't expose Slack's unfurl_links / unfurl_media parameters from chat.postMessage. Every URL in a message generates a large preview card. When an AI agent posts a message with several links (e.g. Linear tickets, Slack archive links, GitHub PRs), the unfurled previews create a wall of cards that buries the actual message content.

There's no mrkdwn-level workaround — unfurl_links: false on the API call is the only way to suppress previews while keeping links clickable.

Proposed solution

Add two optional boolean parameters to the slack_send_message tool:

  • unfurl_links (default: true) — controls unfurling of text-based content
  • unfurl_media (default: true) — controls unfurling of media content

These map directly to the existing chat.postMessage parameters.

Ideally also add them to slack_send_message_draft and slack_schedule_message.

Use case

AI agents (Cursor, Claude Code) posting investigation summaries or triage responses in Slack threads. These messages routinely reference 3-5 URLs. The unfurled previews take up more screen space than the message itself.

Dominant language
Python
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Forks
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Avg merge
1d 6h
Merged PRs (30d)
16

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