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 ulises-jeremias/agent-toolkit --skill slack-assistantgit clone --depth 1 https://github.com/ulises-jeremias/agent-toolkitWrote 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/ulises-jeremias/agent-toolkit/slack-assistant)<a href="https://agentmods.dev/skills/ulises-jeremias/agent-toolkit/slack-assistant"><img src="https://agentmods.dev/badge/skills/ulises-jeremias/agent-toolkit/slack-assistant/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/ulises-jeremias/agent-toolkit/slack-assistant"><img src="https://agentmods.dev/badge/skills/ulises-jeremias/agent-toolkit/slack-assistant.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00054 | $0.01085 |
| Opus 5.5 | $0.00022 | $0.00434 |
| Sonnet 5.5 | $0.00011 | $0.00217 |
| Haiku 4.5 | $0.00005 | $0.00109 |
Grade A, and why
slack-assistant scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
slackcli auth parse-curl --login # paste cURL from browser DevTools How it starts
The opening of the file, as written. The whole thing — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Slack Assistant (slackcli)
Use the slackcli CLI (from shaharia-lab/slackcli)
for Slack workspace automation: reading messages, sending messages, reactions, and canvases.
Important: This is NOT the official Slack Developer CLI (
slack/slack-dev). Use theslack-cliskill for Slack app development workflows.
Default Workspaces
| Context | Workspace |
|---|---|
| `` (.slack.com) |
Use --workspace=<name-or-id> to target a specific workspace.
Without --workspace, the default workspace set via slackcli auth set-default is used.
When to Use
- User asks "what's in #channel-name" or "check the Slack channel"
- User wants to send a message or reply to a thread
- User asks about Slack canvases
- User wants to add a reaction to a message
- Workspace is .slack.com (or whichever workspace the user indicates)
Authentication
# List authenticated workspaces
slackcli auth list
# Login with a bot/user token (run once per workspace)
slackcli auth login --token=<your-bot-token> --workspace-name="My Team"
# Login with browser session tokens (no Slack app needed)
slackcli auth parse-curl --login # paste cURL from browser DevTools
# Set default workspace
slackcli auth set-default T1234567 # use workspace ID from auth list
Configuration is stored in ~/.config/slackcli/workspaces.json.
Conversation Commands
# List all channels in the default workspace
slackcli conversations list
# List channels in a specific workspace
slackcli conversations list --workspace=
# Filter by type
slackcli conversations list --types=public_channel
slackcli conversations list --types=im
# Read recent messages from a channel
slackcli conversations read C1234567890
# Read a specific thread
slackcli conversations read C1234567890 --thread-ts=1234567890.123456
# Read with limit and JSON output (includes ts/thread_ts for replies)
slackcli conversations read C1234567890 --limit=50 --json
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 · 139 lines · 54 tokens per session scan A ca78bf35e508
slack-assistant is a skill published in the GitHub repository ulises-jeremias/agent-toolkit (19 stars, last pushed yesterday), licensed MIT. It adds 54 tokens to every session and 1,085 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-04.
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