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slack-formatting

This skill formats messages using Slack's mrkdwn syntax, which differs from standard Markdown in bold formatting, link syntax, list handling, and available formatting options. Apply it when responding to Slack channels, identified by folder names starting with "slack_" or workspace paths containing Slack identifiers, ensuring proper rendering within Slack's message system.

View source Repository: nanoclaw

Install in Claude Code

Copy

git clone --depth 1 https://github.com/nanocoai/nanoclaw /tmp/slack-formatting && cp -r /tmp/slack-formatting/container/skills/slack-formatting ~/.claude/skills/slack-formatting

Then start a new Claude Code session; the skill loads automatically.

Definition

SKILL.md

# Slack Message Formatting (mrkdwn)

When responding to Slack channels, use Slack's mrkdwn syntax instead of standard Markdown.

## How to detect Slack context

Check your group folder name or workspace path:
- Folder starts with `slack_` (e.g., `slack_engineering`, `slack_general`)
- Or check `/workspace/group/` path for `slack_` prefix

## Formatting reference

### Text styles

| Style | Syntax | Example |
|-------|--------|---------|
| Bold | `*text*` | *bold text* |
| Italic | `_text_` | _italic text_ |
| Strikethrough | `~text~` | ~strikethrough~ |
| Code (inline) | `` `code` `` | `inline code` |
| Code block | ` ```code``` ` | Multi-line code |

### Links and mentions

```
<https://example.com|Link text>     # Named link
<https://example.com>                # Auto-linked URL
<@U1234567890>                       # Mention user by ID
<#C1234567890>                       # Mention channel by ID
<!here>                              # @here
<!channel>                           # @channel
```

### Lists

Slack supports simple bullet lists but NOT numbered lists:

```
• First item
• Second item
• Third item
```

Use `•` (bullet character) or `- ` or `* ` for bullets.

### Block quotes

```
> This is a block quote
> It can span multiple lines
```

### Emoji

Use standard emoji shortcodes: `:white_check_mark:`, `:x:`, `:rocket:`, `:tada:`

## What NOT to use

- **NO** `##` headings (use `*Bold text*` for headers instead)
- **NO** `**double asterisks**` for bold (use `*single asterisks*`)
- **NO** `[text](url)` links (use `<url|text>` instead)
- **NO** `1.` numbered lists (use bullets with numbers: `• 1. First`)
- **NO** tables (use code blocks or plain text alignment)
- **NO** `---` horizontal rules

## Example message

```
*Daily Standup Summary*

_March 21, 2026_

• *Completed:* Fixed authentication bug in login flow
• *In Progress:* Building new dashboard widgets
• *Blocked:* Waiting on API access from DevOps

> Next sync: Monday 10am

:white_check_mark: All tests passing | <https://ci.example.com/builds/123|View Build>
```

## Quick rules

1. Use `*bold*` not `**bold**`
2. Use `<url|text>` not `[text](url)`
3. Use `•` bullets, avoid numbered lists
4. Use `:emoji:` shortcodes
5. Quote blocks with `>`
6. Skip headings — use bold text instead