# marketo_create_or_update_lead

Bulk create or update leads (upsert). Accepts an array of lead records with standard and custom fields. Deduplicates by lookupField (default: email). Max 300 leads per call.

Agent View of the PolicyLayer registry record for `marketo_create_or_update_lead`. HTML page: https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-create-or-update-lead

## Facts

- Tool: `marketo_create_or_update_lead`
- Server: Marketo MCP Server (`alexleventer/marketo-mcp`) — https://policylayer.com/tools/alexleventer-marketo-mcp.md
- Homepage: https://github.com/alexleventer/marketo-mcp
- 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": "marketo_create_or_update_lead",
    "arguments": {}
  }
}
```

## Why marketo_create_or_update_lead is rated Medium

This tool creates and modifies customer data (lead records) in a marketing automation system. While reversible (records can be updated again), bulk upsert operations have significant business impact—incorrect data could corrupt customer databases, trigger unintended marketing campaigns, or affect sales processes. The high volume capacity (300 leads) increases blast radius.

From the tool's own definition: "Tool performs 'create or update leads' (upsert) operations with bulk capabilities (300 leads max per call). The description explicitly states it modifies lead records by creating new records or updating existing ones."

## Use case

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

## Recommended policy (PolicyLayer)

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

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

## Other tools on Marketo MCP Server (26)

- `marketo_delete_channel` — Destructive — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-delete-channel.md
- `marketo_delete_lead` — Destructive — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-delete-lead.md
- `marketo_send_sample_email` — Execute — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-send-sample-email.md
- `marketo_get_channel_by_id` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-channel-by-id.md
- `marketo_get_channels` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-channels.md
- `marketo_get_email_by_id` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-email-by-id.md
- `marketo_get_emails` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-emails.md
- `marketo_get_form_by_id` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-form-by-id.md
- `marketo_get_forms` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-forms.md
- `marketo_get_lead_activities` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-lead-activities.md
- `marketo_get_lead_by_email` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-lead-by-email.md
- `marketo_get_lead_by_id` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-lead-by-id.md
- `marketo_get_lead_changes` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-lead-changes.md
- `marketo_get_lead_lists` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-lead-lists.md
- `marketo_get_program_by_id` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-program-by-id.md
- `marketo_get_program_members` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-program-members.md
- `marketo_get_programs` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-programs.md
- `marketo_get_smart_list_by_id` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-smart-list-by-id.md
- `marketo_get_smart_lists` — Read — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-get-smart-lists.md
- `marketo_add_lead_to_list` — Write — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-add-lead-to-list.md
- `marketo_approve_form` — Write — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-approve-form.md
- `marketo_clone_form` — Write — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-clone-form.md
- `marketo_clone_program` — Write — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-clone-program.md
- `marketo_create_channel` — Write — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-create-channel.md
- `marketo_remove_lead_from_list` — Write — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-remove-lead-from-list.md
- `marketo_update_channel` — Write — https://policylayer.com/tools/alexleventer-marketo-mcp/marketo-update-channel.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=alexleventer-marketo-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/alexleventer-marketo-mcp