# messages_trigger

Trigger (show) a specific message with optional token values

Agent View of the PolicyLayer registry record for `messages_trigger`. HTML page: https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/messages-trigger

## Facts

- Tool: `messages_trigger`
- Server: Propresenter (`@alxpark/propresenter-mcp`) — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp.md
- Install: `npx -y @alxpark/propresenter-mcp`
- Homepage: https://github.com/alxpark/propresenter-mcp
- Risk category: Execute (High 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": "messages_trigger",
    "arguments": {}
  }
}
```

## Why messages_trigger is rated High

This tool triggers external operations (displaying messages in a presentation control system) whose effects are determined by arguments (which message, what token values). The outcome depends entirely on how an AI agent uses it. While not destructive or financial, it performs an action with real-world side effects in a live presentation context, making it Execute rather than Write or Read.

From the tool's own definition: "Tool name 'messages_trigger' and description 'Trigger (show) a specific message with optional token values' indicate the tool executes an action that causes a presentation message to be displayed, affecting the state of the ProPresenter application and what…"

## Use case

AI agents invoke messages_trigger to trigger actions in Propresenter. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

## Recommended policy (PolicyLayer)

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

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "messages_trigger": {
      "limits": [
        {
          "counter": "messages_trigger_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Propresenter (176)

- `clear_layer` — Destructive — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/clear-layer.md
- `messages_delete` — Destructive — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/messages-delete.md
- `props_clear` — Destructive — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/props-clear.md
- `props_delete` — Destructive — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/props-delete.md
- `props_delete_collection` — Destructive — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/props-delete-collection.md
- `stage_delete_layout` — Destructive — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/stage-delete-layout.md
- `announcement_focus_active` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/announcement-focus-active.md
- `announcement_timeline_operation` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/announcement-timeline-operation.md
- `announcement_trigger_active` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/announcement-trigger-active.md
- `announcement_trigger_cue` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/announcement-trigger-cue.md
- `announcement_trigger_next` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/announcement-trigger-next.md
- `announcement_trigger_previous` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/announcement-trigger-previous.md
- `audio_focus_active_playlist` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-focus-active-playlist.md
- `audio_focus_next_playlist` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-focus-next-playlist.md
- `audio_focus_playlist` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-focus-playlist.md
- `audio_focus_previous_playlist` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-focus-previous-playlist.md
- `audio_trigger_active_next` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-trigger-active-next.md
- `audio_trigger_active_playlist` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-trigger-active-playlist.md
- `audio_trigger_active_previous` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-trigger-active-previous.md
- `audio_trigger_focused_next` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-trigger-focused-next.md
- `audio_trigger_focused_playlist` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-trigger-focused-playlist.md
- `audio_trigger_focused_previous` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-trigger-focused-previous.md
- `audio_trigger_playlist` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-trigger-playlist.md
- `audio_trigger_playlist_item` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-trigger-playlist-item.md
- `capture_operation` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/capture-operation.md
- `clear_trigger_group` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/clear-trigger-group.md
- `find_my_mouse` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/find-my-mouse.md
- `focus_active_presentation` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/focus-active-presentation.md
- `focus_next_presentation` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/focus-next-presentation.md
- `focus_presentation` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/focus-presentation.md
- …and 146 more: https://policylayer.com/tools/io-github-alxpark-propresenter-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`

---

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