What is slack-messages CLAUDE.md?

Repository instructions for slack-messages, a command-line and MCP application that searches messages in a Slack workspace. They describe its commands, code layout, storage, and release process.

Use them when developing, testing, linting, or releasing the slack-messages project.

They give coding agents the project-specific rules needed to change the repository without breaking its two operating modes or established workflow.

How cardmagic/slack-messages configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to cardmagic/slack-messages. 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/cardmagic/slack-messages/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/cardmagic/slack-messages

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/cardmagic/slack-messages/claude-md/github.svg)](https://agentmods.dev/instructions/cardmagic/slack-messages/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/cardmagic/slack-messages/claude-md"><img src="https://agentmods.dev/badge/instructions/cardmagic/slack-messages/claude-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/cardmagic/slack-messages/claude-md"><img src="https://agentmods.dev/badge/instructions/cardmagic/slack-messages/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 599 This file is loaded in full into every session.

When invoked 599 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	$0.00599	$0.00599
Opus 5.5	$0.00240	$0.00240
Sonnet 5.5	$0.00120	$0.00120
Haiku 4.5	$0.00060	$0.00060

Measured 2mo ago against content hash 79c56ec2fc56, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

slack-messages 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 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.

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 · 62 lines

How it starts

The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Commands

pnpm build          # Compile TypeScript to dist/
pnpm dev            # Watch mode for development
pnpm typecheck      # Type check without emitting
pnpm lint           # Run oxlint
pnpm test           # Run tests
pnpm test:watch     # Run tests in watch mode

Architecture

Dual-mode CLI/MCP tool for searching Slack messages:

src/
├── index.ts      # Entry point - routes to CLI or MCP mode based on --mcp flag
├── cli.ts        # Commander-based CLI (auth, index, search, etc.)
├── mcp.ts        # MCP server exposing tools via @modelcontextprotocol/sdk
├── config.ts     # Token and workspace configuration management
├── slack-api.ts  # Slack Web API wrapper with rate limit handling
├── indexer.ts    # Fetches messages from Slack API and builds search indexes
├── searcher.ts   # Queries indexes with fuzzy matching via MiniSearch
├── formatter.ts  # Terminal output formatting with chalk
└── types.ts      # Shared types for Slack messages and search

Data flow:

config.ts manages Slack workspace tokens stored in ~/.slack-messages/config.json
slack-api.ts wraps the @slack/web-api client for fetching users, conversations, and messages
indexer.ts fetches all messages and builds FTS5 + MiniSearch indexes in ~/.slack-messages/
searcher.ts queries MiniSearch for fuzzy results, then fetches context from SQLite

Key dependencies:

@slack/web-api: Official Slack API client with retry handling
better-sqlite3: Create FTS5 index for full-text search
minisearch: Fuzzy search with typo tolerance
@modelcontextprotocol/sdk: MCP server for Claude Code integration

Storage

All data stored in ~/.slack-messages/:

config.json - Workspace tokens
index.db - SQLite FTS5 database
fuzzy.json - MiniSearch index
stats.json - Index metadata and cursors for incremental updates
users.json - Cached user information

Read the full file on GitHub · 62 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.

2mo ago First seen · 62 lines · 599 tokens per session scan A 79c56ec2fc56

Subscribe to this mod's changes

slack-messages CLAUDE.md is an instructions file published in the GitHub repository cardmagic/slack-messages (0 stars, last pushed 2mo ago), licensed MIT. It adds 599 tokens to every session, about $0.0024 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 2026-08-31.

slack-messages CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
slack-messages CLAUDE.mdcardmagic/slack-messages	Instructions file	0	2mo ago	MIT	A	599	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

slack-messages: Instructions file for Claude Code