# spawn_niagara_at_location Spawn a Niagara particle system at a world location. Agent View of the PolicyLayer registry record for `spawn_niagara_at_location`. HTML page: https://policylayer.com/tools/jjpxdev-unreal-mcp/spawn-niagara-at-location ## Facts - Tool: `spawn_niagara_at_location` - Server: Unreal (`@jjpxdev/unreal-mcp`) — https://policylayer.com/tools/jjpxdev-unreal-mcp.md - Install: `npx -y @jjpxdev/unreal-mcp` - Homepage: https://www.npmjs.com/package/@jjpxdev/unreal-mcp - Risk category: Execute (High risk) - Registry record: grade F, identity unverified - Server rate-limited: no - Parameters: 4 (2 required) - Recommended policy verdict: Rate-limited ## Parameters | Parameter | Type | Required | Description | | --- | --- | --- | --- | | `location` | object | yes | World location | | `rotation` | object | no | | | `system_path` | string | yes | Niagara system asset path | | `auto_destroy` | boolean | no | Auto-destroy when finished | Parameters from the server's own tool schema. ## Example call (MCP tools/call, JSON-RPC 2.0) ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "spawn_niagara_at_location", "arguments": { "location": {}, "system_path": "" } } } ``` ## Why spawn_niagara_at_location is rated High This tool triggers an external operation in the Unreal Engine runtime by spawning a particle system at a specified world location. It initiates an active engine operation with real-time effects, placing it in the Execute category. Misuse could clutter scenes or cause performance issues, but effects are generally transient and reversible, warranting medium severity. From the tool's own definition: "Spawn a Niagara particle system at a world location" Risk signals: High parameter count (10 properties) ## Use case AI agents invoke spawn_niagara_at_location to trigger actions in Unreal. 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 Unreal: ```json { "version": "1", "default": "deny", "tools": { "spawn_niagara_at_location": { "limits": [ { "counter": "spawn_niagara_at_location_rate", "window": "minute", "max": 10, "scope": "grant" } ] } } } ``` ## Other tools on Unreal (126) - `delete_actor` — Destructive — https://policylayer.com/tools/jjpxdev-unreal-mcp/delete-actor.md - `delete_asset` — Destructive — https://policylayer.com/tools/jjpxdev-unreal-mcp/delete-asset.md - `delete_material_expression` — Destructive — https://policylayer.com/tools/jjpxdev-unreal-mcp/delete-material-expression.md - `remove_graph_node` — Destructive — https://policylayer.com/tools/jjpxdev-unreal-mcp/remove-graph-node.md - `build_cook_run` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/build-cook-run.md - `build_graph` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/build-graph.md - `build_plugin` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/build-plugin.md - `build_target` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/build-target.md - `call_preset_function` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/call-preset-function.md - `clean_project` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/clean-project.md - `compile_blueprint` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/compile-blueprint.md - `content_audit` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/content-audit.md - `cook_content` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/cook-content.md - `execute_console_command` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/execute-console-command.md - `execute_python` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/execute-python.md - `generate_lods` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/generate-lods.md - `package_project` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/package-project.md - `recompile_material` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/recompile-material.md - `reinit_niagara_system` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/reinit-niagara-system.md - `render_sequence` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/render-sequence.md - `reset_niagara_system` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/reset-niagara-system.md - `run_all_automation_tests` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/run-all-automation-tests.md - `run_automation_test` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/run-automation-test.md - `run_automation_tests_by_category` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/run-automation-tests-by-category.md - `run_editor_utility_blueprint` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/run-editor-utility-blueprint.md - `run_editor_utility_widget` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/run-editor-utility-widget.md - `run_gauntlet` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/run-gauntlet.md - `run_map_check` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/run-map-check.md - `run_stat_command` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/run-stat-command.md - `spawn_niagara_attached` — Execute — https://policylayer.com/tools/jjpxdev-unreal-mcp/spawn-niagara-attached.md - …and 96 more: https://policylayer.com/tools/jjpxdev-unreal-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=jjpxdev-unreal-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/jjpxdev-unreal-mcp