A Slack integration that lets Nexus interact with a Slack workspace through many workspace operations.

It helps send, update, delete, and schedule messages; manage channels, reactions, pins, reminders, files, direct messages, and message searches.

It removes the need to perform supported Slack actions manually in the Slack interface.

slack — Skill for Claude Code and Codex by DorianSchlede

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 DorianSchlede/nexus-template --skill slack

Clone the repo

git clone --depth 1 https://github.com/DorianSchlede/nexus-template

Made for: Claude Code, Codex.

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/dorianschlede/nexus-template/slack/github.svg)](https://agentmods.dev/skills/dorianschlede/nexus-template/slack)

Your own site

<a href="https://agentmods.dev/skills/dorianschlede/nexus-template/slack"><img src="https://agentmods.dev/badge/skills/dorianschlede/nexus-template/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/dorianschlede/nexus-template/slack"><img src="https://agentmods.dev/badge/skills/dorianschlede/nexus-template/slack.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 540 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.

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	$0.00017	$0.00540
Opus 5	$0.00009	$0.00270
Sonnet 5	$0.00003	$0.00108
Haiku 4.5	$0.00002	$0.00054

Measured 8d ago against content hash 115a96738bef, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

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 8d ago.

The scan reads SKILL.md. This mod also ships 39 executable files (slack-master/scripts/add_reaction.py, slack-master/scripts/channel_history.py, slack-master/scripts/channel_info.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

00-system/skills/integrations/slack/SKILL.md · 85 lines

How it starts

The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Slack Integration

Complete Slack integration with 32+ API operations using User OAuth.

Purpose

Provides full Slack workspace interaction:

Send, update, delete, and schedule messages
List and create channels
Search messages and files
Manage reactions and pins
Set reminders
Upload files
Direct messages and group DMs

Quick Setup (30 seconds)

Credentials are included - just authorize your account:

Add to .env:

SLACK_CLIENT_ID=3499735674373.10122697240033
SLACK_CLIENT_SECRET=dce1a170a489edab7234411850b8aeab

Run: python 00-system/skills/slack/slack-master/scripts/setup_slack.py
Click "Allow" in browser - done!

Package Contents

slack/
├── credentials/
│   ├── slack-credentials.json    # Client ID + Secret (copy to .env)
│   └── slack-app-manifest.json   # For creating your own app
├── slack-connect/                # Entry point skill
└── slack-master/                 # Scripts and references
    ├── scripts/                  # 32 API operation scripts
    └── references/               # Setup, API docs, troubleshooting

Available Operations

Category	Operations
Messages	send, update, delete, schedule
Channels	list, create, info, history, join, leave, invite
Users	list, info
DMs	list, open, history (direct + group)
Files	upload, list, search
Reactions	add, remove, get
Pins	add, remove, list
Reminders	create, list, delete
Search	messages, files
Team	info

Example Usage

# Send message
uv run python slack-master/scripts/send_message.py --channel "#general" --text "Hello!"

# Search messages
uv run python slack-master/scripts/search_messages.py --query "project update"

# List channels
uv run python slack-master/scripts/list_channels.py --json

Authentication

Uses User OAuth - messages appear as you, not a bot. Each team member gets their own token.

Version: 1.0 Tested: 29/29 endpoint tests passing

Read the full file on GitHub · 85 lines

Files

What ships with it

49 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.

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.

8d ago First seen · 85 lines · 17 tokens per session scan A 115a96738bef

Subscribe to this mod's changes

slack is a skill published in the GitHub repository DorianSchlede/nexus-template (8 stars, last pushed 7mo ago), licensed MIT. It adds 17 tokens to every session and 540 once invoked, about $0.0001 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 2026-09-03.

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