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 sigcli/sigcli --skill slackgit clone --depth 1 https://github.com/sigcli/sigcliWrote 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/sigcli/sigcli/slack)<a href="https://agentmods.dev/skills/sigcli/sigcli/slack"><img src="https://agentmods.dev/badge/skills/sigcli/sigcli/slack/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/sigcli/sigcli/slack"><img src="https://agentmods.dev/badge/skills/sigcli/sigcli/slack.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 | $0.00090 | $0.02073 |
| Opus 5.5 | $0.00036 | $0.00829 |
| Sonnet 5.5 | $0.00018 | $0.00415 |
| Haiku 4.5 | $0.00009 | $0.00207 |
Grade A, and why
slack 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 187 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Slack
Read channels, search messages, check unreads, send messages, manage reactions, and look up users via Slack.
Setup (run FIRST — every time, before any operation)
You MUST complete this setup before running any script. Do NOT skip this step.
sig status app-slack 2>&1
Check the JSON output fields configured and valid:
configured: false→ run Provider Setup below. Do NOT proceed without completing it.valid: false(but configured: true) → runsig login app-slack, then re-check.valid: true→ detect proxy (see below), then execute the user's request.
Provider Setup
- Read
<SKILL_DIR>/references/provider-config.yaml - Append the provider block to
~/.sig/config.yamlunderproviders: - Ask the user: "Do you need a proxy to access this site?" — if yes, add
networkProxy: <url>under the provider in config.yaml - Run
sig login app-slack(with--network-proxy <url>if proxy was specified) - Verify: run
sig status app-slackagain — must showvalid: truebefore proceeding
Proxy Detection (after provider is valid)
grep -A15 "^\s*app-slack:" ~/.sig/config.yaml | grep networkProxy | awk '{print $2}'
If this outputs a URL, prefix ALL python3 commands with HTTPS_PROXY=<url> HTTP_PROXY=<url>.
If using socks5, convert to socks5h for python (e.g. socks5://... → socks5h://...).
If empty, no proxy needed.
Running Scripts
All scripts require setup to be completed first (see above).
Scripts Reference
All scripts are in this skill's scripts/ directory. Run via Bash tool.
| Script | Purpose |
|---|---|
slack_channels.py |
List/filter channels |
slack_history.py |
Get channel/DM message history |
slack_threads.py |
Get thread replies |
slack_search.py |
Search messages with filters |
slack_send.py |
Send message or threaded reply |
slack_unreads.py |
Get unread messages across channels |
slack_users.py |
Search users by name/email |
slack_reactions.py |
Add or remove emoji reactions |
What ships with it
21 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/provider-config.yaml 1.1 KB
- scripts/__init__.py 0 B runs code
- scripts/requirements.txt 17 B
- scripts/slack_channels.py 4.2 KB runs code
- scripts/slack_client.py 15 KB runs code
- scripts/slack_history.py 4.0 KB runs code
- scripts/slack_reactions.py 1.9 KB runs code
- scripts/slack_search.py 6.0 KB runs code
- scripts/slack_send.py 2.0 KB runs code
- scripts/slack_threads.py 2.8 KB runs code
- scripts/slack_unreads.py 7.5 KB runs code
- scripts/slack_users.py 4.8 KB runs code
- tests/test_slack_channels.py 5.6 KB runs code
- tests/test_slack_client.py 18 KB runs code
- tests/test_slack_history.py 2.7 KB runs code
- tests/test_slack_reactions.py 1.8 KB runs code
- tests/test_slack_search.py 5.5 KB runs code
- tests/test_slack_send.py 1.6 KB runs code
- tests/test_slack_threads.py 2.0 KB runs code
- tests/test_slack_unreads.py 8.7 KB runs code
- tests/test_slack_users.py 7.8 KB runs code
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.
- 2mo ago First seen · 187 lines · 90 tokens per session scan A 28691b427dc8
slack is a skill published in the GitHub repository sigcli/sigcli (292 stars, last pushed 1mo ago), licensed MIT. It adds 90 tokens to every session and 2,073 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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