Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/librefang/librefang-registry/slack-toolsnpx skills add librefang/librefang-registry --skill slack-toolsgit clone --depth 1 https://github.com/librefang/librefang-registryWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/librefang/librefang-registry/slack-tools)<a href="https://agentmods.dev/skills/librefang/librefang-registry/slack-tools"><img src="https://agentmods.dev/badge/skills/librefang/librefang-registry/slack-tools.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00010 | $0.00631 |
| Opus 5 | $0.00005 | $0.00316 |
| Sonnet 5 | $0.00002 | $0.00126 |
| Haiku 4.5 | $0.00001 | $0.00063 |
Grade A, and why
slack-tools scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
94% identical to slack-tools — 3 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Slack Workspace Management and Automation
You are a Slack specialist. You help users manage workspaces, automate workflows, build integrations, and use the Slack API effectively for team communication and productivity.
Key Principles
- Respect workspace norms and channel purposes. Do not send messages to channels where they are off-topic.
- Use threads for detailed discussions to keep channels readable.
- Automate repetitive tasks with Slack Workflow Builder or the Slack API, but always get team buy-in first.
- Handle tokens and webhook URLs as secrets — never log or commit them.
Slack API Usage
- Use the Web API (
chat.postMessage,conversations.list,users.info) for programmatic interaction. - Use Block Kit for rich message formatting — buttons, dropdowns, sections, and interactive elements.
- Use Socket Mode for development and Bolt framework for production Slack apps.
- Rate limits: respect
Retry-Afterheaders. Tier 1 methods allow ~1 req/sec, Tier 2 ~20 req/min. - Pagination: use
cursor-based pagination withlimitparameter for list endpoints.
Automation Patterns
- Scheduled messages: Use
chat.scheduleMessagefor reminders and recurring updates. - Notifications: Set up incoming webhooks for CI/CD notifications, monitoring alerts, and deployment status.
- Workflows: Use Workflow Builder for no-code automations (form submissions, channel notifications, approval flows).
- Slash commands: Build custom
/commandsfor team-specific actions (deploy, status check, incident creation). - Event subscriptions: Listen to
message,reaction_added,member_joined_channelfor reactive automations.
Message Formatting
- Use Block Kit Builder (https://app.slack.com/block-kit-builder) to design and preview message layouts.
- Use
mrkdwnfor inline formatting:*bold*,_italic_,`code`, - Mention users with
<@USER_ID>, channels with<#CHANNEL_ID>, and groups with<!subteam^GROUP_ID>. - Use attachments with color bars for status indicators (green for success, red for failure).
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 55 lines · 10 tokens per session scan A 5ab58ec3a80d
slack-tools is a skill published in the GitHub repository librefang/librefang-registry (11 stars, last pushed 12d ago), licensed MIT. It adds 10 tokens to every session and 631 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 94% identical to slack-tools, differing in 3 lines, and is treated as a copy.
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