Godot MCP Runtime

List all signals defined on a node and their current connections. Use before connect_signal/disconnect_signal to verify signal/method names. The connections[].target field is already scene-root-relative in the "root/..." form connect_signal/disconnect_signal accept as targetNodePath (a self-connection reports as "root") - pass it straight through with no conversion. Returns: nodeType and signals[], each with name and current connections (signal/target/method). Errors if node not found.

Return a recursive file tree of a Godot project. Use to discover project structure when paths are unknown. Pass extensions to filter (e.g. ["gd","tscn"]); maxDepth caps recursion (-1 unlimited). Skips hidden (dot-prefixed) entries and the .mcp directory. Returns: { name, type, path, extension?, children? } (nested tree).

Parse project.godot into structured JSON. Use to inspect configured display, input, rendering, etc. settings without launching Godot. Pass section to filter to one INI section (e.g. "display", "application"). Returns: { settings: { [section]: { [key]: value } } } or { settings: { [key]: value } } when section is given. Complex Godot types (including multi-line arrays/dicts, e.g. the full "[input]" action map) are returned as their complete raw string, not just the first line; keys outside any section appear under __global__.

Parse a .tscn file for ext_resource references (scripts, textures, subscenes). Use to inspect what a scene depends on before refactoring or moving files. Returns: the queried scene path and dependencies[] from ext_resource refs (path, type, optional uid). Errors if scene file does not exist.

Get the scene hierarchy as a nested tree of { name, type, path, script, children }. Use maxDepth:1 for a shallow listing of direct children only; default -1 returns the full tree. parentPath scopes the result to a subtree. Returns the nested tree as JSON text. Errors if scene does not exist or parentPath is not found.

Walk the running scene tree and return all Control nodes with positions, sizes, types, and text content. Always call this before simulate_input click_element actions to discover valid element names and paths. Requires an active runtime session (run_project or attach_project). visibleOnly defaults true; pass false to include hidden Controls. filter narrows by class. Returns: elements[] with path/type/rect/visible plus optional text/disabled/tooltip.

Open the Godot editor GUI for a project for the human user. Use only when the user explicitly asks to "open the editor"; for any agent-driven work, use the headless scene/node tools (add_node, set_node_properties, etc.) instead - the editor cannot be controlled programmatically. Returns plain-text confirmation after spawning the editor process. Errors if projectPath has no project.godot.

List all registered autoloads in a project with paths and singleton status. Use first when diagnosing headless failures - broken autoloads crash all headless ops, so this tells you what is loaded. No Godot process required (reads project.godot directly). Returns: [{ name, path, singleton }].

Find Godot projects under a directory by locating project.godot files. Use to discover available projects when the user has not specified one; for inspecting a known project, use check_project. recursive:true descends into subdirectories (skipping hidden ones); default false checks only the directory itself and its immediate children. Returns: [{ path, name }], empty array on no matches.

Set the texture on an existing Sprite2D, Sprite3D, or TextureRect node. For new nodes, pass texture via add_node properties instead. Saves automatically. texturePath must be a real file under projectPath. Returns a plain-text confirmation message naming the loaded texture. Errors if the node is not one of those three classes, or the texture file does not exist. Errors while a Godot runtime session is active on this project; stop_project (or detach_project) clears it.

Capture a window of Godot's function profiler - the editor's Profiler tab numbers. Requires run_project with profiling: true. Blocks for `seconds` (default 5). Times are elapsed, not CPU; inclusive rows overlap - never sum totalMs. Returns: rows (function, file, line, calls, selfMs/totalMs, per-frame averages, percentOfFrame, peak), the frame budget, servers, worstFrame, plus frames/frameGaps/limitReached for capture quality. Errors if profiling was off at launch or a capture is already open.

Unregister an autoload from a project by name. Use to recover from a broken autoload that is crashing headless ops. No Godot process required. Returns plain-text confirmation on success. Errors if no autoload with that name exists.

Spawn a Godot project as a child process with stdout/stderr captured. Required before take_screenshot, simulate_input, get_ui_elements, run_script, or get_debug_output. Set profiling: true at launch to enable the profiler tools. Use attach_project for one you launched yourself. Verifies MCP bridge readiness before returning success. Returns status with the assigned bridge port. Call stop_project when done. Errors if projectPath is not a Godot project or another session is already active.

Execute a custom GDScript in the live running project with full scene tree access. Requires an active runtime session. Script must extend RefCounted and define func execute(scene_tree: SceneTree) -> Variant. Return values are JSON-serialized (primitives, Vector2/3, Color, Dictionary, Array, and Node path strings). Use print() for debug output - it appears in get_debug_output, not in the result. In spawned mode, stderr runtime errors escalate to errors (when the script returns null) or surface as warnings. Returns: { success, result, warnings?, tip? } where result is the JSON-serialized return …

Re-pack and save a scene, optionally to a different path (save-as). Most mutations (add_node, set_node_properties, delete_nodes, etc.) auto-save - only use this for save-as via newPath, or to re-canonicalize a hand-edited .tscn. Overwrites silently. Returns a plain-text confirmation naming the save path. Errors if the scene file does not exist. Errors while a Godot runtime session is active on this project; stop_project (or detach_project) clears it.

Plain-text (substring) search across project files. Use to find references, callers, or signatures across the codebase. Default fileTypes is ["gd","tscn","cs","gdshader"]; caseSensitive default false; maxResults default 100. Skips hidden entries and the .mcp directory. Returns: matches[] (project-relative file, 1-indexed lineNumber, line text) and truncated:true when maxResults was hit - consider raising it.

Set one or more node properties on a scene in one Godot process. Always-array: pass a single-element updates array for one-off edits. Values are checked against the property's declared type and error instead of silently storing that type's zero value. Object-typed properties (e.g. CollisionShape2D.shape) take a res:// path, a {type: ClassName, ...props} dict that builds a Resource inline, or null to clear; slash-suffixed keys like shader_parameter/<uniform> go inside that dict, not on the node. Value coercion, Packed*Array/Array[T] element rules and error details: Property Values in docs/tools…

Simulate sequential input in a running project and report what each action did. Action `type`: key, mouse_button, mouse_motion, click_element, action, text, wait. For key/mouse_button/action, omit `pressed` to tap (press+release); set it to hold or release. click_element resolves by node path/name (see get_ui_elements), not visible text. Returns: results[] per action with ok, timing, signals fired, the Control hit, UI `changes` (appeared/disappeared/changed), `watch` samples, and `errors` from input handlers (spawned sessions only). Invalid batches inject nothing; a runtime failure stops the b…

Start a profiler capture and return immediately, so simulate_input, run_script and screenshots can drive the game while it records. Requires run_project with profiling: true. Stops itself after `seconds` (default 30, max 60); call stop_profiler for the results. Returns: active, firstFrame, captureLimit, maxSeconds. Use profile_project instead for an unattended window. Errors if a capture is already running or profiling was not enabled at launch.

Stop the capture started by start_profiler and rank the recorded functions; a capture that already hit its time limit is read back as-is, and can be re-read with a different sort. Times are elapsed, not CPU; inclusive rows overlap - never sum totalMs. Returns: the same payload as profile_project - rows (file, line, function, calls, selfMs/totalMs, per-frame averages, percentOfFrame, peak frame), frame budget, servers, worstFrame, frames, frameGaps, limitReached. Errors if no capture was started.

Stop the spawned Godot project and clean up bridge state. Call when done with runtime testing, even after a crash, and even if you closed the Godot window yourself: it frees the process slot and clears the flag blocking scene-editing tools. A process that exited on its own already removed the bridge autoload at that moment, and this still succeeds - it reports alreadyExited:true with the exit code and the logs captured before the exit, and leaves a finished profiler capture readable. Attached sessions detach without killing the external process. Returns: message, mode, externalProcessPreserved…

Capture a PNG of the running viewport. responseMode: preview (default - saves full PNG, returns bounded inline preview at 960x540), full (full inline PNG; use for small text or pixel-level inspection), path_only (saved-path only, no inline image). Saved under .mcp/godot-runtime/screenshots/ (persists after stop_project). Returns: inline image block (full/preview modes), plus path and size of the saved PNG; previewPath/previewSize in preview mode; warnings for non-fatal runtime errors. Errors if no session or bridge times out (default 10000ms).

Modify an existing autoload's path or singleton flag. Pass either or both - omitted fields keep their current value. Use instead of remove_autoload + add_autoload (single edit, no orphan window). No Godot process required. Returns plain-text confirmation on success. Errors if autoloadName is not registered.

Validate GDScript syntax or scene integrity using headless Godot. Use before attach_script or run_script to catch parse errors early. Give exactly one of scriptPath, source, or scenePath, or a targets array validated in one Godot process. Returns { valid, errors } for one target, { results: [{ target, valid, errors }] } for a batch. An errors entry is { line?, message } for a parse error, or { check, problem?, message } for a checks[] finding. checks requires scenePath and instantiates the scene, running each attached script's _init(). Any parse error yields valid:false.