slack-skills-plugin is a plugin that connects coding agents to Slack through a Slack MCP server and provides Slack-focused skills for users and developers. It is used with Claude Code, Cursor, Codex, and other coding agents to work with Slack and build Slack applications. The catalogue entries are the plugin's included skills, commands, MCP server, instructions, and settings.
Borrowing it
Nothing to install: this file belongs to slackapi/slack-skills-plugin. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/slackapi/slack-skills-plugin/main/AGENTS.mdgit clone --depth 1 https://github.com/slackapi/slack-skills-pluginWrote 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/instructions/slackapi/slack-skills-plugin/agents-md)<a href="https://agentmods.dev/instructions/slackapi/slack-skills-plugin/agents-md"><img src="https://agentmods.dev/badge/instructions/slackapi/slack-skills-plugin/agents-md/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/instructions/slackapi/slack-skills-plugin/agents-md"><img src="https://agentmods.dev/badge/instructions/slackapi/slack-skills-plugin/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.01751 | $0.01751 |
| Opus 5.5 | $0.00700 | $0.00700 |
| Sonnet 5.5 | $0.00350 | $0.00350 |
| Haiku 4.5 | $0.00175 | $0.00175 |
Grade A, and why
slack-skills-plugin AGENTS.md 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.
How it starts
The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Slack Plugin
This plugin integrates Slack with Ai tools, providing tools to search, read, and send messages in Slack. It also offers useful skills for users and developers.
Commands
/slack:summarize-channel <channel-name>: Summarize recent activity in a Slack channel/slack:find-discussions <topic>: Find discussions about a specific topic across Slack channels/slack:draft-announcement <topic>: Draft a well-formatted Slack announcement and save it as a draft/slack:standup: Generate a standup update based on your recent Slack activity/slack:channel-digest <channel1, channel2, ...>: Get a digest of recent activity across multiple Slack channels
Development Commands
Requires Python 3.15+. Run make install before first use to set up the virtual environment and test dependencies.
Always use the make targets rather than invoking python, pytest, ruff, or other tools directly. The targets manage the virtualenv for you; running the underlying tools by hand skips that setup and will behave differently. If a make command is broken or missing something you need, fix the Makefile rather than working around it with the raw command.
Run make help for the full list of targets and what each does. The common ones:
| Command | Purpose |
|---|---|
make help |
Show this help message |
make install |
Set up everything (venv + deps) |
make lint |
Run linter checks (ruff for Python, rumdl for Markdown) |
make format |
Auto-format code (ruff for Python, rumdl for Markdown) |
make typecheck |
Run mypy static type checks |
make test-unit |
Run structural/unit validation tests |
make test-eval |
Run LLM-judged tests (DeepEval against Gemini) |
make test |
Run all tests (unit + eval) |
make clean |
Remove virtualenv and local Cursor install |
make cursor-install |
Install this plugin into a local Cursor for development |
make cursor-uninstall |
Uninstall this plugin from the local Cursor install |
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 Changed de4cb9c021d2
- 6d ago Changed · +4 lines · +224 tokens per session 8bd1b6c4c4c0
- 1mo ago Changed · +13 lines · +237 tokens per session e79a2a190e86
- 1mo ago First seen · 81 lines · 1,290 tokens per session scan A 16372fa96d1a
slack-skills-plugin AGENTS.md is an instructions file published in the GitHub repository slackapi/slack-skills-plugin (150 stars, last pushed yesterday), licensed MIT. It adds 1,751 tokens to every session, about $0.0070 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.