What is create-slack-app?

A guided setup for starting a new Slack app or automated Slack agent with Bolt, Slack's framework for building apps in JavaScript or Python. It checks the required tools, signs in, creates a test environment, and starts a project from a template.

Use it to bootstrap a new Bolt app, prepare its Slack environment, scaffold the project, and run it locally.

It removes the manual setup work involved in checking versions, authenticating, choosing a language, and creating a working starter project.

create-slack-app — Skill for Claude Code and Codex by slackapi: A guided setup for starting a new Slack app…

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.

agentmods

npx agentmods add skills/slackapi/slack-skills-plugin/create-slack-app

Any agent

npx skills add slackapi/slack-skills-plugin --skill create-slack-app

Clone the repo

git clone --depth 1 https://github.com/slackapi/slack-skills-plugin

Made for: Claude Code, Codex.

Or install slack, the plugin that ships this one along with the rest of its 8 skills, 5 commands, 1 MCP server.

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/slackapi/slack-skills-plugin/create-slack-app.svg)](https://agentmods.dev/skills/slackapi/slack-skills-plugin/create-slack-app)

Your own site

<a href="https://agentmods.dev/skills/slackapi/slack-skills-plugin/create-slack-app"><img src="https://agentmods.dev/badge/skills/slackapi/slack-skills-plugin/create-slack-app.svg" alt="Measured on agentmods" height="20"></a>

Per session 74 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,997 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00074	$0.01997
Opus 5	$0.00037	$0.00999
Sonnet 5	$0.00015	$0.00399
Haiku 4.5	$0.00007	$0.00200

Measured 4d ago against content hash 4ba2eb423948, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

create-slack-app 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 4d 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/create-slack-app/SKILL.md · 187 lines

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.

Create Slack App

Help the developer create a Slack app or agent using Bolt for $0.

This skill walks through the full setup: prerequisites, authentication, sandbox creation, project scaffolding from a template, and running the app locally.

Step 1: Check Prerequisites

1a. Detect the Slack CLI command

Use the slack:slack-cli skill — Step 1: Detect the Slack CLI — to check whether the public Slack CLI is installed and resolve its command name. The fingerprint check, alias fallback, and install instructions all live there; do not duplicate them here.

Once resolved, use the detected command name for all CLI commands throughout the rest of this skill. We refer to it as SLACK_CMD below — substitute the actual resolved command name everywhere you see SLACK_CMD.

1b. Verify the CLI version

Run SLACK_CMD version and print the version to confirm everything is working before continuing.

1c. Check language runtime

If $0 is bolt-js: Run node --version to verify Node.js is installed (v18+ required). If not installed, suggest brew install node or point to https://nodejs.org.
If $0 is bolt-python: Run python3 --version to verify Python is installed (3.6+ required). If not installed, suggest brew install python3 or point to https://python.org.

Step 2: Authenticate with the Slack CLI

Use the slack:slack-cli skill — Step 5: Authentication (slack auth) — to check the developer's auth status and walk them through SLACK_CMD login if they're not already authenticated.

Wait for confirmation that authentication succeeded before proceeding.

Step 3: Set Up a Developer Sandbox

Run SLACK_CMD sandbox list to check if the developer already has a sandbox.

If a sandbox exists: Show it and confirm they want to use it.
If no sandbox exists: Tell the developer to create one:
```
! SLACK_CMD sandbox create
```
Alternatively, they can create one at https://api.slack.com/developer-program/sandboxes or join the Developer Program at https://api.slack.com/developer-program/join.

Read the full file on GitHub · 187 lines

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.

4d ago First seen · 187 lines · 74 tokens per session scan A 4ba2eb423948

Subscribe to this mod's changes

create-slack-app is a skill published in the GitHub repository slackapi/slack-skills-plugin (117 stars, last pushed today), licensed MIT. It adds 74 tokens to every session and 1,997 once invoked, about $0.0004 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.

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