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Merge pull request #245 from coolwuu/docs/fix-reaction-attachment-tool-env-vars

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docs: fix incorrect env var references for reactions and add missing tool env vars
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Dmitrii Korotovskii
2026-05-14 20:46:22 +02:00
committed by GitHub
parent 23871daa95 7f4e7e6194
commit a91a6183b0
1 changed files with 4 additions and 2 deletions
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README.md
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@@ -88,7 +88,7 @@ Get list of channels
### 6. reactions_add:
Add an emoji reaction to a message in a public channel, private channel, or direct message (DM, or IM) conversation.
> **Note:** Adding reactions is disabled by default for safety. To enable, set the `SLACK_MCP_ADD_MESSAGE_TOOL` environment variable. If set to a comma-separated list of channel IDs, reactions are enabled only for those specific channels. See the Environment Variables section below for details.
> **Note:** Adding reactions is disabled by default for safety. To enable, set the `SLACK_MCP_REACTION_TOOL` environment variable. If set to a comma-separated list of channel IDs, reactions are enabled only for those specific channels. See the Environment Variables section below for details.
- **Parameters:**
- `channel_id` (string, required): ID of the channel in format `Cxxxxxxxxxx` or its name starting with `#...` or `@...` aka `#general` or `@username_dm`.
@@ -98,7 +98,7 @@ Add an emoji reaction to a message in a public channel, private channel, or dire
### 7. reactions_remove:
Remove an emoji reaction from a message in a public channel, private channel, or direct message (DM, or IM) conversation.
> **Note:** Removing reactions follows the same permission model as `reactions_add`. To enable, set the `SLACK_MCP_ADD_MESSAGE_TOOL` environment variable.
> **Note:** Removing reactions follows the same permission model as `reactions_add`. To enable, set the `SLACK_MCP_REACTION_TOOL` environment variable.
- **Parameters:**
- `channel_id` (string, required): ID of the channel in format `Cxxxxxxxxxx` or its name starting with `#...` or `@...` aka `#general` or `@username_dm`.
@@ -261,6 +261,8 @@ Fetches a CSV directory of all users in the workspace.
| `SLACK_MCP_ADD_MESSAGE_TOOL` | No | `nil` | Enable message posting via `conversations_add_message` by setting it to `true` for all channels, a comma-separated list of channel IDs to whitelist specific channels, or use `!` before a channel ID to allow all except specified ones. If empty, the tool is only registered when explicitly listed in `SLACK_MCP_ENABLED_TOOLS`. |
| `SLACK_MCP_ADD_MESSAGE_MARK` | No | `nil` | When `conversations_add_message` is enabled (via `SLACK_MCP_ADD_MESSAGE_TOOL` or `SLACK_MCP_ENABLED_TOOLS`), setting this to `true` will automatically mark sent messages as read. |
| `SLACK_MCP_ADD_MESSAGE_UNFURLING` | No | `nil` | Enable to let Slack unfurl posted links or set comma-separated list of domains e.g. `github.com,slack.com` to whitelist unfurling only for them. If text contains whitelisted and unknown domain unfurling will be disabled for security reasons. |
| `SLACK_MCP_REACTION_TOOL` | No | `nil` | Enable `reactions_add` and `reactions_remove` tools by setting to `true` for all channels, a comma-separated list of channel IDs to whitelist specific channels, or use `!` before a channel ID to allow all except specified ones. If empty, the tools are only registered when explicitly listed in `SLACK_MCP_ENABLED_TOOLS`. |
| `SLACK_MCP_ATTACHMENT_TOOL` | No | `nil` | Enable the `attachment_get_data` tool by setting to `true`, `1`, or `yes`. Does not support channel-level restrictions. If empty, the tool is only registered when explicitly listed in `SLACK_MCP_ENABLED_TOOLS`. |
| `SLACK_MCP_MARK_TOOL` | No | `nil` | Enable the `conversations_mark` tool by setting to `true` or `1`. Disabled by default to prevent accidental marking of messages as read. |
| `SLACK_MCP_USERS_CACHE` | No | `~/Library/Caches/slack-mcp-server/users_cache.json` (macOS)<br>`~/.cache/slack-mcp-server/users_cache.json` (Linux)<br>`%LocalAppData%/slack-mcp-server/users_cache.json` (Windows) | Path to the users cache file. Used to cache Slack user information to avoid repeated API calls on startup. |
| `SLACK_MCP_CHANNELS_CACHE` | No | `~/Library/Caches/slack-mcp-server/channels_cache_v2.json` (macOS)<br>`~/.cache/slack-mcp-server/channels_cache_v2.json` (Linux)<br>`%LocalAppData%/slack-mcp-server/channels_cache_v2.json` (Windows) | Path to the channels cache file. Used to cache Slack channel information to avoid repeated API calls on startup. |