Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add tallclub/matimo --skill mailchimpgit clone --depth 1 https://github.com/tallclub/matimoWrote 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/skills/tallclub/matimo/mailchimp)<a href="https://agentmods.dev/skills/tallclub/matimo/mailchimp"><img src="https://agentmods.dev/badge/skills/tallclub/matimo/mailchimp/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/skills/tallclub/matimo/mailchimp"><img src="https://agentmods.dev/badge/skills/tallclub/matimo/mailchimp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00020 | $0.01156 |
| Opus 5.5 | $0.00008 | $0.00462 |
| Sonnet 5.5 | $0.00004 | $0.00231 |
| Haiku 4.5 | $0.00002 | $0.00116 |
Grade A, and why
mailchimp 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.
How it starts
The opening of the file, as written. The whole thing — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mailchimp
How to use Matimo's Mailchimp tools for audiences, subscribers and campaigns.
All Available Tools
| Tool | Purpose | Approval |
|---|---|---|
mailchimp-get-lists |
List audiences (lists) | No |
mailchimp-get-list-members |
List an audience's subscribers | No |
mailchimp-add-list-member |
Add a subscriber | No |
mailchimp-update-list-member |
Change a subscriber's status, email or merge fields | No |
mailchimp-remove-list-member |
Archive a subscriber | Yes (DELETE) |
mailchimp-create-campaign |
Create a campaign | No |
mailchimp-send-campaign |
Send a campaign now | Yes |
There is no tool to set campaign content, read campaign reports, or list campaigns; do those in Mailchimp.
Authentication
Requires MAILCHIMP_API_KEY. Every tool also takes server_prefix, the data center at the end of the key (abc123-us6 → us6).
Audiences
mailchimp-get-listswithserver_prefix; optionalcount(max 1000),offset. Each list'sidis thelist_idthe other tools take.mailchimp-get-list-memberswithserver_prefix,list_id; optionalstatus(subscribed,unsubscribed,pending,cleaned,transactional,archived),count,offset.
Adding a Subscriber
mailchimp-add-list-member with server_prefix, list_id, email_address, status (subscribed, unsubscribed, pending, cleaned), and optional merge_fields, tags.
{
"server_prefix": "us6",
"list_id": "abc123",
"email_address": "[email protected]",
"status": "pending",
"merge_fields": { "FNAME": "Alice", "LNAME": "Smith" },
"tags": ["webinar"]
}
Use pending to send a double opt-in confirmation. Adding an address that is already in the audience fails with Member Exists; use the update tool instead.
Updating or Removing a Subscriber
Both take subscriber_hash: the MD5 of the lowercase email address (md5("[email protected]")).
mailchimp-update-list-memberwithserver_prefix,list_id,subscriber_hash, and any ofstatus,email_address,merge_fields.mailchimp-remove-list-memberwithserver_prefix,list_id,subscriber_hash. It archives the member and asks for approval first.
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 · -5 lines · -5 tokens per session 04dc7caacb45
- 2mo ago First seen · 122 lines · 25 tokens per session scan A e2ffb3b13fa8
mailchimp is a skill published in the GitHub repository tallclub/matimo (18 stars, last pushed yesterday), licensed MIT. It adds 20 tokens to every session and 1,156 once invoked, about $0.0001 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 2026-08-30.
mailchimp compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mailchimptallclub/matimo | Skill | 18 | yesterday | MIT | A | 20 | Claude Code, Codex |
| imagegenopenai/codex | Skill | 133k | yesterday | Apache-2.0 | A | 113 | Codex |
| playwright-climicrosoft/playwright | Skill | 99k | yesterday | Apache-2.0 | A | 19 | Claude Code |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | 4d ago | MIT | A | 200 | Claude Code, Codex |
| systematic-debuggingobra/superpowers | Skill | 313k | 3d ago | MIT | A | 21 | Claude Code |
| next-cache-components-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 95 | Claude Code |
| next-partial-prefetching-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 103 | Claude Code |