Borrowing it
Nothing to install: this file belongs to musictechlab/mtl-mailchimp-mcp. 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/musictechlab/mtl-mailchimp-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/musictechlab/mtl-mailchimp-mcpWrote 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/musictechlab/mtl-mailchimp-mcp/claude-md)<a href="https://agentmods.dev/instructions/musictechlab/mtl-mailchimp-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/musictechlab/mtl-mailchimp-mcp/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.
<a href="https://agentmods.dev/instructions/musictechlab/mtl-mailchimp-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/musictechlab/mtl-mailchimp-mcp/claude-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 | $0.00352 | $0.00352 |
| Opus 5 | $0.00176 | $0.00176 |
| Sonnet 5 | $0.00070 | $0.00070 |
| Haiku 4.5 | $0.00035 | $0.00035 |
Grade A, and why
mtl-mailchimp-mcp 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 7d 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
CLAUDE.md
Project context for Claude Code.
What this is
An MCP server that wraps the Mailchimp Marketing API so campaigns can be copied, created, filled with HTML, and test-sent from Claude Code.
Tech stack
- Python 3.10+, Poetry
mcp[cli](FastMCP),httpx,python-dotenvruff(lint + format),pytest
Layout
src/mtl_mailchimp_mcp/mailchimp.py— thin httpx client over the Marketing APIsrc/mtl_mailchimp_mcp/server.py— FastMCP tools (@mcp.tool()), returning human-readable stringssrc/mtl_mailchimp_mcp/__main__.py—python -m mtl_mailchimp_mcp
Run / test
poetry install
poetry run ruff check . && poetry run ruff format --check .
poetry run pytest
poetry run python -m mtl_mailchimp_mcp # start the server
Hard rules
- Draft + test only. Never add a tool that sends or schedules a campaign to a real audience. Sending stays a human action in the Mailchimp UI.
- The API key comes from
MAILCHIMP_API_KEYin.env(never commit.env, never log the key). mailchimp_set_content_from_filemust keep its path guard (confined root, no hidden/secret files, size cap).- Mailchimp does not rehost images — HTML content must use absolute image URLs.
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.
- 7d ago First seen · 40 lines · 352 tokens per session scan A 7943f0d301f6
mtl-mailchimp-mcp CLAUDE.md is an instructions file published in the GitHub repository musictechlab/mtl-mailchimp-mcp (0 stars, last pushed 2mo ago), licensed MIT. It adds 352 tokens to every session, about $0.0018 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 2026-09-01.
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