What is slack-mcp-server CLAUDE.md?

A CLAUDE.md instruction file for developers and AI assistants working on a Python server that connects Slack to AI clients. It documents the project, its folders, development commands, and checks.

Use it when developing or reviewing the slack-mcp-server repository. It covers Slack integration tools, Python and package-manager details, tests, and pre-commit checks.

It gives contributors the project context and working rules in one place. This reduces guesswork about how the code is organized, tested, and maintained.

How Chisanan232/slack-mcp-server configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Chisanan232/slack-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Chisanan232/slack-mcp-server/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/Chisanan232/slack-mcp-server

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/instructions/chisanan232/slack-mcp-server/claude-md.svg)](https://agentmods.dev/instructions/chisanan232/slack-mcp-server/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/chisanan232/slack-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/chisanan232/slack-mcp-server/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 1,711 This file is loaded in full into every session.

When invoked 1,711 The same file — it is already loaded in full.

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	$0.01711	$0.01711
Opus 5	$0.00856	$0.00856
Sonnet 5	$0.00342	$0.00342
Haiku 4.5	$0.00171	$0.00171

Measured 8d ago against content hash 5872dbcd9a18, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

slack-mcp-server CLAUDE.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 8d 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.

CLAUDE.md · 180 lines

How it starts

The opening of the file, as written. The whole thing — 180 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance for AI assistants working in this repository.

Project Overview

slack-mcp is a Python MCP (Model Context Protocol) server for Slack integration. It enables AI clients to interact with Slack via 6 tools: post messages, read channel/thread messages, reply to threads, read emojis, and add reactions.

Package: slack-mcp v0.2.0 on PyPI
Python: 3.12+ (supports 3.12, 3.13; not 3.14 due to PyO3 limitation)
Package manager: uv
Build backend: Hatchling

Repository Structure

slack_mcp/          # Main source package
├── settings.py     # Pydantic settings (all config lives here)
├── types.py        # PEP 695 type aliases
├── events.py       # Slack event type definitions
├── client/         # Slack SDK client management
├── logging/        # Logging configuration
├── mcp/            # MCP server (entry, app factory, server/tools, CLI, models)
├── webhook/        # Webhook server (entry, FastAPI app, event consumer/handlers)
└── integrate/      # Integrated MCP + Webhook server

test/               # Test suites
├── unit_test/      # Fast, heavily mocked
├── integration_test/
├── e2e_test/       # Requires real Slack API credentials
├── contract_test/
└── ci_script_test/

docs/               # Docusaurus documentation site (pnpm)
scripts/            # CI and Docker helper scripts
examples/           # Usage examples

Development Commands

# Install all dependencies (dev + pre-commit-ci groups by default)
uv sync

# Run pre-commit hooks on all files
uv run pre-commit run --all-files

# Run all tests
uv run pytest

# Run specific test type
uv run pytest test/unit_test/
uv run pytest test/integration_test/
uv run pytest test/e2e_test/      # Requires SLACK_BOT_TOKEN, E2E_TEST_API_TOKEN

# Build the package
uv build

# Build Docker image
docker build -t slack-mcp-server .

Running the Servers

# MCP server (stdio is default transport)
slack-mcp-server

# MCP server via SSE on port 8000
slack-mcp-server --transport sse --host 0.0.0.0 --port 8000

# MCP server via streamable-http
slack-mcp-server --transport streamable-http --host 0.0.0.0 --port 8000

# Webhook server (processes incoming Slack events)
slack-webhook-server --host 0.0.0.0 --port 3000

# Integrated mode (MCP + Webhook on one port)
slack-mcp-server --integrated --transport sse --port 8000

Read the full file on GitHub · 180 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.

8d ago First seen · 180 lines · 1,711 tokens per session scan A 5872dbcd9a18

Subscribe to this mod's changes

slack-mcp-server CLAUDE.md is an instructions file published in the GitHub repository Chisanan232/slack-mcp-server (1 stars, last pushed today), licensed MIT. It adds 1,711 tokens to every session, about $0.0086 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 2026-08-31.

Git and workflow Productivity Python mcp-server slack webhook-event-handlers webhook-server

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