Borrowing it
Nothing to install: this file belongs to antonio-mello-ai/mcp-slack. 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/antonio-mello-ai/mcp-slack/main/AGENTS.mdgit clone --depth 1 https://github.com/antonio-mello-ai/mcp-slackWrote 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/antonio-mello-ai/mcp-slack/agents-md)<a href="https://agentmods.dev/instructions/antonio-mello-ai/mcp-slack/agents-md"><img src="https://agentmods.dev/badge/instructions/antonio-mello-ai/mcp-slack/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/antonio-mello-ai/mcp-slack/agents-md"><img src="https://agentmods.dev/badge/instructions/antonio-mello-ai/mcp-slack/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 | $0.00573 | $0.00573 |
| Opus 5.5 | $0.00229 | $0.00229 |
| Sonnet 5.5 | $0.00115 | $0.00115 |
| Haiku 4.5 | $0.00057 | $0.00057 |
Grade A, and why
mcp-slack 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 1mo 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.
What it actually says
AGENTS.md — MCP Slack
Purpose
This repository provides a public, self-hostable MCP server for listing Slack channels, reading channel messages and posting messages. Keep code, examples, issues and documentation generic and safe for public collaboration.
Public repository boundary
- Never commit Slack tokens, real workspace or channel inventories, private messages, user directories, private hostnames, local user paths or internal topology.
- Use placeholders and synthetic Slack IDs and content in documentation and tests.
- Do not copy operational context from private deployments into this repository.
- Treat
slack_post_messageas an external side effect. Tests must mock Slack APIs and must not post to live workspaces.
Stack
- Python 3.12+
- FastMCP
- Slack SDK asynchronous Web API client
uv, Ruff and pytest
Local setup and validation
git config core.hooksPath .githooks
uv sync --all-extras --all-groups
uv run --all-extras --all-groups pytest -q
uvx ruff check src/ tests/
uvx ruff format --check src/ tests/
The current version and release inconsistency is tracked in GitHub Issue #12. Do not add another version source while resolving it.
Documentation sources of truth
README.md: public installation, Slack App setup and usage entry pointdocs/fluxos-negocio.md: behavior exposed to MCP clientsdocs/arquitetura.md: implementation model and boundariesdocs/operacao.md: credentials, validation and release operationdocs/index.md: navigable documentation index
Roadmap, backlog and priority live in GitHub Issues and the Felhen GitHub
Project. Delivery history lives in closed Issues, pull requests and GitHub
Releases. Do not add roadmap.md, docs/backlog.md or CHANGELOG.md.
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.
- 1mo ago Changed · +53 lines · +455 tokens per session f901e0c478a8
- 2mo ago First seen · 24 lines · 118 tokens per session scan A 6bb8052a81cb
mcp-slack AGENTS.md is an instructions file published in the GitHub repository antonio-mello-ai/mcp-slack (1 stars, last pushed 1mo ago), licensed MIT. It adds 573 tokens to every session, about $0.0023 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.
mcp-slack AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mcp-slack AGENTS.mdantonio-mello-ai/mcp-slack | Instructions file | 1 | 1mo ago | MIT | A | 573 | Codex, OpenCode |
| 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 |