A set of instructions for using Slack, a team messaging service, from a coding agent. It covers messages, channels, automated updates, and daily team check-ins.

Use it to send channel or direct messages, create or manage public channels, upload files, post updates, organize communication, and run standups when the required access is configured.

It gives the agent a defined way to coordinate work in Slack instead of leaving messages, channel actions, and team updates unspecified.

slack — Skill for Claude Code and Codex by pbc-os/smb-starter-kit

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 pbc-os/smb-starter-kit --skill slack

Clone the repo

git clone --depth 1 https://github.com/pbc-os/smb-starter-kit

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/pbc-os/smb-starter-kit/slack/github.svg)](https://agentmods.dev/skills/pbc-os/smb-starter-kit/slack)

Your own site

<a href="https://agentmods.dev/skills/pbc-os/smb-starter-kit/slack"><img src="https://agentmods.dev/badge/skills/pbc-os/smb-starter-kit/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/pbc-os/smb-starter-kit/slack"><img src="https://agentmods.dev/badge/skills/pbc-os/smb-starter-kit/slack.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,088 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. 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	$0.00040	$0.03088
Opus 5.5	$0.00016	$0.01235
Sonnet 5.5	$0.00008	$0.00618
Haiku 4.5	$0.00004	$0.00309

Measured 2mo ago against content hash 0ae3b4ff74a6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

slack 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 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

bins: ["curl", "jq"]

skills/tier-2-communication/slack/SKILL.md · 377 lines

How it starts

The opening of the file, as written. The whole thing — 377 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Slack

Team messaging built for how small businesses actually communicate.

For user lookups and directory management, see the slack-directory skill. This skill covers everything else: sending messages, managing channels, posting automated updates, and organizing your team's communication.

Triggers

"send a slack message"
"post to #channel"
"message the team"
"set up slack channels"
"slack standup"
"post an update to slack"
Any request involving Slack messaging, channels, or team communication

Prerequisites

Slack Bot Token with appropriate scopes (see Setup below)
jq installed for JSON parsing
slack-directory skill for user lookups
secrets-manager skill for secure token storage

Setup

Required Bot Token Scopes

Scope	What It Enables
`chat:write`	Send messages to channels and DMs
`channels:read`	List and get info about public channels
`channels:manage`	Create and archive public channels
`groups:read`	List private channels the bot is in
`im:write`	Send direct messages
`users:read`	Look up users (for slack-directory)
`files:write`	Upload files to channels
`reactions:write`	Add emoji reactions

Getting Your Bot Token

Go to api.slack.com/apps
Create a new app (or use existing)
Go to OAuth & Permissions → add the scopes above
Install to your workspace
Copy the Bot User OAuth Token (xoxb-...)

Store securely:

# GCP Secret Manager (recommended)
echo -n "xoxb-your-token" | gcloud secrets create slack-bot-token --data-file=-

# Or set as environment variable
export SLACK_BOT_TOKEN="xoxb-your-token"

Retrieving Your Token

# From GCP Secret Manager
TOKEN=$(gcloud secrets versions access latest --secret="slack-bot-token")

# From environment
TOKEN="$SLACK_BOT_TOKEN"

Every message and channel change is visible to your team and hard to fully unsend. Before the agent posts a message, sends a DM, creates or archives a channel, or uploads a file, show the user the exact text and target and get explicit approval — unless they've pre-approved a specific recurring automation (e.g. a daily briefing to a named channel), in which case state that standing approval the first time and stay within its scope.

Read the full file on GitHub · 377 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/smb-team-messaging.md 7.5 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.

2mo ago First seen · 377 lines · 40 tokens per session scan A 0ae3b4ff74a6

Subscribe to this mod's changes

slack is a skill published in the GitHub repository pbc-os/smb-starter-kit (10 stars, last pushed 5mo ago), licensed MIT. It adds 40 tokens to every session and 3,088 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 2026-08-31.

Project management

slack next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
slackpbc-os/smb-starter-kit	Skill	10	5mo ago	MIT	A	40	Claude Code, Codex
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code

slack