# evaluate_expression

Evaluate a GDScript expression in the editor or running game context

Agent View of the PolicyLayer registry record for `evaluate_expression`. HTML page: https://policylayer.com/tools/keeveeg-godot-mcp/evaluate-expression

## Facts

- Tool: `evaluate_expression`
- Server: Godot (`@keeveeg/godot-mcp`) — https://policylayer.com/tools/keeveeg-godot-mcp.md
- Install: `npx -y @keeveeg/godot-mcp`
- Homepage: https://www.npmjs.com/package/@keeveeg/godot-mcp
- Risk category: Execute (High risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 2 (1 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `context` | string | no | Context to evaluate in (default: editor) |
| `expression` | string | yes | GDScript expression to evaluate |

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": "evaluate_expression",
    "arguments": {
      "expression": "<expression>"
    }
  }
}
```

## Why evaluate_expression is rated High

This tool executes arbitrary GDScript code in either the Godot editor or a running game. Arbitrary code execution can have wide-ranging effects depending on what expressions are evaluated, including file system access, process spawning, or game state manipulation. This is clearly Execute category with high severity due to the arbitrary code execution surface.

From the tool's own definition: "Evaluate a GDScript expression in the editor or running game context"

Risk signals: Accepts freeform code/query input (expression)

## Use case

AI agents invoke evaluate_expression to trigger actions in Godot. 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 Godot:

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

## Other tools on Godot (320)

- `clear_editor_log` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/clear-editor-log.md
- `clear_editor_selection` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/clear-editor-selection.md
- `clear_output` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/clear-output.md
- `delete_export_preset` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/delete-export-preset.md
- `delete_node` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/delete-node.md
- `delete_particles` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/delete-particles.md
- `delete_resource` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/delete-resource.md
- `delete_save_file` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/delete-save-file.md
- `delete_scene` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/delete-scene.md
- `delete_script` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/delete-script.md
- `delete_shader` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/delete-shader.md
- `delete_theme` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/delete-theme.md
- `remove_animation` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/remove-animation.md
- `remove_audio_bus` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/remove-audio-bus.md
- `remove_audio_player` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/remove-audio-player.md
- `remove_autoload` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/remove-autoload.md
- `remove_autoload_config` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/remove-autoload-config.md
- `remove_input_action` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/remove-input-action.md
- `remove_navigation_agent` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/remove-navigation-agent.md
- `remove_navigation_link` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/remove-navigation-link.md
- `remove_navigation_region` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/remove-navigation-region.md
- `reset_editor_layout` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/reset-editor-layout.md
- `tilemap_clear` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/tilemap-clear.md
- `uninstall_addon` — Destructive — https://policylayer.com/tools/keeveeg-godot-mcp/uninstall-addon.md
- `bake_navigation_mesh` — Execute — https://policylayer.com/tools/keeveeg-godot-mcp/bake-navigation-mesh.md
- `capture_frames` — Execute — https://policylayer.com/tools/keeveeg-godot-mcp/capture-frames.md
- `click_button_by_text` — Execute — https://policylayer.com/tools/keeveeg-godot-mcp/click-button-by-text.md
- `continue_execution` — Execute — https://policylayer.com/tools/keeveeg-godot-mcp/continue-execution.md
- `execute_editor_script` — Execute — https://policylayer.com/tools/keeveeg-godot-mcp/execute-editor-script.md
- `execute_game_script` — Execute — https://policylayer.com/tools/keeveeg-godot-mcp/execute-game-script.md
- …and 290 more: https://policylayer.com/tools/keeveeg-godot-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=keeveeg-godot-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/keeveeg-godot-mcp