A browser-automation skill for using Slack, a workplace chat service, through its website. It can navigate Slack, inspect messages, and interact with conversations after restoring a saved login session.

Use it to read or search messages, check notifications, send messages or direct messages, reply in threads, react to posts, and move between channels.

It lets an agent handle Slack tasks through the web interface while accounting for pages that change after each action.

slack-web — Skill for Claude Code by ruizrica

Install

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.

Any agent

npx skills add ruizrica/agent-pi --skill slack-web

Clone the repo

git clone --depth 1 https://github.com/ruizrica/agent-pi

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ruizrica/agent-pi/slack-web/github.svg)](https://agentmods.dev/skills/ruizrica/agent-pi/slack-web)

Your own site

<a href="https://agentmods.dev/skills/ruizrica/agent-pi/slack-web"><img src="https://agentmods.dev/badge/skills/ruizrica/agent-pi/slack-web/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/ruizrica/agent-pi/slack-web"><img src="https://agentmods.dev/badge/skills/ruizrica/agent-pi/slack-web.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 109 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,437 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00109	$0.01437
Opus 5	$0.00055	$0.00718
Sonnet 5	$0.00022	$0.00287
Haiku 4.5	$0.00011	$0.00144

Measured 10d ago against content hash a9d0ff19abb9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

slack-web 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 10d 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.

skills/slack-web/SKILL.md · 219 lines

How it starts

The opening of the file, as written. The whole thing — 219 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Slack Web Automation

Interact with Slack through its web interface using agent-browser.

Core Workflow

Every Slack interaction follows this pattern:

Restore session: agent-browser state load ~/.slack-auth-state.json
Open Slack: agent-browser --headed open "https://app.slack.com"
Snapshot: agent-browser snapshot -i -c (get refs)
Interact: Use refs to click, type, navigate
Re-snapshot: After every action — Slack's DOM changes constantly

# Restore and open
agent-browser state load ~/.slack-auth-state.json
agent-browser --headed open "https://app.slack.com"
agent-browser wait --load networkidle
agent-browser set viewport 1920 1080

# Verify logged in (URL should contain /client/)
agent-browser get url

# Navigate with quick switcher
agent-browser press "Meta+k"
agent-browser wait 500
agent-browser snapshot -i
agent-browser fill @eXX "general"
agent-browser wait 1000
agent-browser snapshot -i
agent-browser click @eXX
agent-browser wait --load networkidle

# Read messages
agent-browser snapshot -c

Authentication

First-Time Login (Manual)

agent-browser --headed open "https://app.slack.com"
# PAUSE — tell user to log in manually
# After login confirmed:
agent-browser get url  # verify /client/ in URL
agent-browser state save ~/.slack-auth-state.json

Restore Session

agent-browser state load ~/.slack-auth-state.json
agent-browser --headed open "https://app.slack.com"
agent-browser wait --load networkidle
agent-browser get url
# If URL contains "signin" → session expired, user must re-login

Actions

Read Messages

# Navigate to channel (quick switcher is fastest)
agent-browser press "Meta+k"
agent-browser wait 500
agent-browser snapshot -i
agent-browser fill @eXX "channel-name"
agent-browser wait 1000
agent-browser snapshot -i
agent-browser click @eXX
agent-browser wait --load networkidle

# Read
agent-browser snapshot -c

Send a Message

# In the target channel, find compose box
agent-browser snapshot -i
# Look for textbox with "Message #channel" placeholder
agent-browser click @eXX  # compose area
agent-browser type @eXX "Your message"
agent-browser press "Enter"
agent-browser wait 1000
agent-browser snapshot -c  # verify sent

Read the full file on GitHub · 219 lines

Files

What ships with it

1 file 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/workflows.md 3.0 KB

Changes

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.

10d ago First seen · 219 lines · 109 tokens per session scan A a9d0ff19abb9

Subscribe to this mod's changes

slack-web is a skill published in the GitHub repository ruizrica/agent-pi (266 stars, last pushed 1mo ago), licensed MIT. It adds 109 tokens to every session and 1,437 once invoked, about $0.0005 per session on Opus 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.

Browser automation Productivity

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