# audio_trigger_active_previous Trigger the previous item in the active playlist Agent View of the PolicyLayer registry record for `audio_trigger_active_previous`. HTML page: https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/audio-trigger-active-previous ## Facts - Tool: `audio_trigger_active_previous` - 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": "audio_trigger_active_previous", "arguments": {} } } ``` ## Why audio_trigger_active_previous is rated High This tool executes an action (triggering previous track) in an external system (ProPresenter media player) whose effects depend on the runtime state of the playlist and audio system. It is not a simple read operation (doesn't just query state), nor does it create/modify persistent data. It has observable side effects on audio playback state, classifying it as Execute rather than Write. From the tool's own definition: "Tool name includes 'trigger' and description states 'Trigger the previous item in the active playlist', indicating it executes a command to control audio playback in ProPresenter 7." ## Use case AI agents invoke audio_trigger_active_previous 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": { "audio_trigger_active_previous": { "limits": [ { "counter": "audio_trigger_active_previous_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_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 - `focus_previous_presentation` — Execute — https://policylayer.com/tools/io-github-alxpark-propresenter-mcp/focus-previous-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