# add_members_to_segment

A write tool on the Mailchimp MCP MCP server.

Agent View of the PolicyLayer registry record for `add_members_to_segment`. HTML page: https://policylayer.com/tools/damientilman-mailchimp-mcp-server/add-members-to-segment

## Facts

- Tool: `add_members_to_segment`
- Server: Mailchimp MCP (`damientilman/mailchimp-mcp-server`) — https://policylayer.com/tools/damientilman-mailchimp-mcp-server.md
- Homepage: https://github.com/damientilman/mailchimp-mcp-server
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "add_members_to_segment",
    "arguments": {}
  }
}
```

## Why add_members_to_segment is rated Medium

This tool creates or modifies audience segment membership in Mailchimp, which is a reversible data modification operation (Write category). Severity is high because incorrect segment assignments could affect marketing campaign targeting, customer communication flows, and business operations, with potential blast radius across multiple email campaigns and audience segments.

From the tool's own definition: "Tool name 'add_members_to_segment' indicates modification of segment membership. Sibling tools include 'add_member', 'batch_subscribe', and 'create_campaign', which are all Write operations modifying Mailchimp data."

## Use case

AI agents use add_members_to_segment to create or update resources in Mailchimp MCP, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mailchimp MCP environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Mailchimp MCP:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_members_to_segment": {
      "limits": [
        {
          "counter": "add_members_to_segment_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Mailchimp MCP (226)

- `cancel_send` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/cancel-send.md
- `delete_audience` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-audience.md
- `delete_batch_webhook` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-batch-webhook.md
- `delete_campaign` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-campaign.md
- `delete_campaign_feedback` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-campaign-feedback.md
- `delete_campaign_folder` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-campaign-folder.md
- `delete_connected_site` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-connected-site.md
- `delete_file` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-file.md
- `delete_interest` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-interest.md
- `delete_interest_category` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-interest-category.md
- `delete_landing_page` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-landing-page.md
- `delete_member` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-member.md
- `delete_member_note` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-member-note.md
- `delete_member_permanent` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-member-permanent.md
- `delete_merge_field` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-merge-field.md
- `delete_promo_code` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-promo-code.md
- `delete_promo_rule` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-promo-rule.md
- `delete_segment` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-segment.md
- `delete_store` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-store.md
- `delete_store_cart` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-store-cart.md
- `delete_store_customer` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-store-customer.md
- `delete_store_order` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-store-order.md
- `delete_store_order_line` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-store-order-line.md
- `delete_store_product` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-store-product.md
- `delete_store_product_image` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-store-product-image.md
- `delete_store_product_variant` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-store-product-variant.md
- `delete_template` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-template.md
- `delete_template_folder` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-template-folder.md
- `delete_verified_domain` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-verified-domain.md
- `delete_webhook` — Destructive — https://policylayer.com/tools/damientilman-mailchimp-mcp-server/delete-webhook.md
- …and 196 more: https://policylayer.com/tools/damientilman-mailchimp-mcp-server.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=damientilman-mailchimp-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/damientilman-mailchimp-mcp-server