Borrowing it
Nothing to install: this file belongs to cyanheads/mailchimp-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.
curl -O https://raw.githubusercontent.com/cyanheads/mailchimp-mcp-server/main/CLAUDE.mdgit clone --depth 1 https://github.com/cyanheads/mailchimp-mcp-serverWrote 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/cyanheads/mailchimp-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/cyanheads/mailchimp-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/cyanheads/mailchimp-mcp-server/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/cyanheads/mailchimp-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/cyanheads/mailchimp-mcp-server/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 | $0.06341 | $0.06341 |
| Opus 5.5 | $0.02536 | $0.02536 |
| Sonnet 5.5 | $0.01268 | $0.01268 |
| Haiku 4.5 | $0.00634 | $0.00634 |
Grade A, and why
mailchimp-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 6d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- mailchimp-mcp-server AGENTS.md — 91% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 409 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Protocol
Server: mailchimp-mcp-server
Version: 0.6.0
Framework: @cyanheads/mcp-ts-core ^0.13.18
Engines: Bun ≥1.4.0, Node ≥24.0.0
MCP SDK: @modelcontextprotocol/server ^2.4.0 (resolved 2.4.0)
Zod: ^4.6.7
Surface: 18 tools always-on · 2 conditional (mailchimp_assets when MAILCHIMP_ASSETS_DIR set, mailchimp_local_templates when MAILCHIMP_TEMPLATES_DIR set) · 4 resources · 1 prompt · 1 published skill (skills/mailchimp-guide) · 3 services (mailchimp, assets, templates)
Read the framework docs first:
node_modules/@cyanheads/mcp-ts-core/CLAUDE.mdcontains the full API reference — builders, Context, error codes, exports, patterns. This file covers server-specific conventions only.
What's Next?
When the user asks what to do next, what's left, or needs direction, suggest relevant options based on the current project state:
- Re-run the
setupskill — ensures CLAUDE.md, skills, structure, and metadata are populated and up to date with the current codebase - Run the
design-mcp-serverskill — if the tool/resource surface hasn't been mapped yet, work through domain design - Add tools/resources/prompts — scaffold new definitions using the
add-tool,add-app-tool,add-resource,add-promptskills - Add services — scaffold domain service integrations using the
add-serviceskill - Add tests — scaffold tests for existing definitions using the
add-testskill - Field-test definitions — exercise tools/resources/prompts with real inputs using the
field-testskill, get a report of issues and pain points - Run
devcheck— lint, format, typecheck, and security audit - Run the
security-passskill — audit handlers for MCP-specific security gaps: output injection, scope blast radius, input sinks, tenant isolation - Run the
polish-docs-metaskill — finalize README, CHANGELOG, metadata, and agent protocol for shipping - Run the
maintenanceskill — investigate changelogs, adopt upstream changes, and sync skills afterbun update --latest - Run the
release-and-publishskill — post-wrapup ship workflow: verification gate, push, publish to npm + GHCR
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.
- 6d ago Changed · +2 lines · +83 tokens per session 4e210d8080f3
- 7d ago Changed · +5 lines · +150 tokens per session fc0562114dad
- 24d ago Changed · +2 lines · +206 tokens per session 0eccd678625c
- 27d ago Changed · -46 lines · -223 tokens per session a6d235fdbac8
- 1mo ago Changed · +3 lines · +159 tokens per session b10ae4ad43a7
- 1mo ago Changed · +8 lines · +379 tokens per session f20f2d4ed375
- 2mo ago First seen · 435 lines · 5,587 tokens per session scan A 5678d1a1b691
mailchimp-mcp-server CLAUDE.md is an instructions file published in the GitHub repository cyanheads/mailchimp-mcp-server (2 stars, last pushed 7d ago), licensed Apache-2.0. It adds 6,341 tokens to every session, about $0.0254 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.
mailchimp-mcp-server CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mailchimp-mcp-server CLAUDE.mdcyanheads/mailchimp-mcp-server | Instructions file | 2 | 7d ago | Apache-2.0 | A | 6,341 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| vscode model-prompts.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 2,022 | GitHub Copilot |