# cdp_update_message_def

Update a message definition by ID. Pass updated fields as a JSON string.

Agent View of the PolicyLayer registry record for `cdp_update_message_def`. HTML page: https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-update-message-def

## Facts

- Tool: `cdp_update_message_def`
- Server: CDP MCP Server (`atharva-joshi77/cdp-mcp`) — https://policylayer.com/tools/atharva-joshi77-cdp-mcp.md
- Homepage: https://github.com/atharva-joshi77/cdp-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": "cdp_update_message_def",
    "arguments": {}
  }
}
```

## Why cdp_update_message_def is rated Medium

This tool creates or modifies data reversibly by updating message definitions in the CDP system. It falls under Write category as it changes existing configurations/data without deleting them.

From the tool's own definition: "Tool name 'cdp_update_message_def' with description 'Update a message definition by ID' indicates modification of existing data. The phrase 'Pass updated fields as a JSON string' confirms it accepts parameters to alter message definitions."

## Use case

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

## Recommended policy (PolicyLayer)

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

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

## Other tools on CDP MCP Server (287)

- `cdp_cache_delete_by_group` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-cache-delete-by-group.md
- `cdp_cache_delete_by_id` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-cache-delete-by-id.md
- `cdp_cache_delete_by_key` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-cache-delete-by-key.md
- `cdp_deactivate_provision_instance` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-deactivate-provision-instance.md
- `cdp_delete_a360_rule` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-a360-rule.md
- `cdp_delete_alert` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-alert.md
- `cdp_delete_alert_def` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-alert-def.md
- `cdp_delete_audience_def` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-audience-def.md
- `cdp_delete_campaign` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-campaign.md
- `cdp_delete_client` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-client.md
- `cdp_delete_column_validator` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-column-validator.md
- `cdp_delete_connector` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-connector.md
- `cdp_delete_connector_template` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-connector-template.md
- `cdp_delete_cubic_set_def` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-cubic-set-def.md
- `cdp_delete_dashboard` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-dashboard.md
- `cdp_delete_data_erasure_request` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-data-erasure-request.md
- `cdp_delete_data_export` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-data-export.md
- `cdp_delete_dispatch` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-dispatch.md
- `cdp_delete_emailable_page` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-emailable-page.md
- `cdp_delete_execution_bucket` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-execution-bucket.md
- `cdp_delete_execution_summary_group` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-execution-summary-group.md
- `cdp_delete_mapping_template` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-mapping-template.md
- `cdp_delete_message_def` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-message-def.md
- `cdp_delete_output_connector` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-output-connector.md
- `cdp_delete_output_connector_def` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-output-connector-def.md
- `cdp_delete_prediction` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-prediction.md
- `cdp_delete_report_def` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-report-def.md
- `cdp_delete_role` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-role.md
- `cdp_delete_schedule` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-schedule.md
- `cdp_delete_selfservice_user` — Destructive — https://policylayer.com/tools/atharva-joshi77-cdp-mcp/cdp-delete-selfservice-user.md
- …and 257 more: https://policylayer.com/tools/atharva-joshi77-cdp-mcp.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`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=atharva-joshi77-cdp-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/atharva-joshi77-cdp-mcp