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 skills add itseffi/agentic-os --skill message-checkgit clone --depth 1 https://github.com/itseffi/agentic-osWrote 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/itseffi/agentic-os/message-check)<a href="https://agentmods.dev/skills/itseffi/agentic-os/message-check"><img src="https://agentmods.dev/badge/skills/itseffi/agentic-os/message-check/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/itseffi/agentic-os/message-check"><img src="https://agentmods.dev/badge/skills/itseffi/agentic-os/message-check.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00025 | $0.00367 |
| Opus 5.5 | $0.00010 | $0.00147 |
| Sonnet 5.5 | $0.00005 | $0.00073 |
| Haiku 4.5 | $0.00003 | $0.00037 |
Grade A, and why
slack-message-check 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 1mo 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
89% identical to slack-message-check — 8 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.
What it actually says
Slack Message Check
Check Slack channels for important messages and summarize activity.
Instructions
Step 1: List Relevant Channels
Call slack_list_channels to see available channels.
Step 2: Check Priority Channels
For each important channel (determined by user preferences or channel activity):
- Call
slack_get_channel_historywith limit of 20 messages - Filter for messages since last check
Step 3: Summarize Activity
Present findings to user:
Slack activity since yesterday:
**#general** (3 new messages)
- @alice mentioned the deployment schedule
**#engineering** (12 new messages)
- Discussion about API changes
- @bob asked for review on PR #234
**DMs** (2 unread)
- @carol: Question about meeting time
Step 4: Offer Actions
| Option | Description |
|---|---|
| Create task | Turn a message into a task |
| Reply | Draft a response |
| Mark read | Continue without action |
Step 5: Continue Daily Flow
After Slack check, continue with normal planning workflow.
Example Flow
User: "What should I work on today?"
Agent:
- Checks Slack for new activity
- "You have 5 new messages across 2 channels..."
- Summarizes key items
- Offers to create tasks from actionable messages
- Continues with task planning
Notes
- Focus on actionable messages, not all activity
- Prioritize DMs and mentions over general channel noise
- Respect user's channel preferences if configured
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.
- 1mo ago First seen · 68 lines · 25 tokens per session scan A b204cca6cd7c
slack-message-check is a skill published in the GitHub repository itseffi/agentic-os (117 stars, last pushed 14d ago), licensed MIT. It adds 25 tokens to every session and 367 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 89% identical to slack-message-check, differing in 8 lines, and is treated as a copy.
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