MCP Servers

hx-multianim-mcp

Connects MCP clients to a running hx-multianim game via DevBridge for scene inspection, state manipulation, input injection, and diagnostics.

README

hx-multianim-mcp

An MCP server that connects Claude (or any MCP client) to a running hx-multianim application via its DevBridge.

Call connect first. All other tools return a not_connected error until connect succeeds. The DevBridge port is printed to game stdout as [DevBridge] Listening on port N (default 9001).

Tools

Connection & health

Tool	Description
`connect`	Connect to a game instance on a specific port/host. Must be called first.
`ping`	Lightweight health check — uptime and port
`performance`	FPS, draw calls, triangle count, object count, scene dimensions

Scene inspection

Tool	Description
`list_screens`	Registered screens with active/failed status
`list_builders`	Loaded `.manim` builders and their parameter definitions
`scene_graph`	Recursive scene tree dump (`depth`)
`inspect_element`	Position, size, visibility, text of a named element
`inspect_programmable`	Deep inspection of a live programmable (params, slots, refs, elements)
`find_element_at`	Hit-test scene coords, front-to-back list of objects
`get_screen_state`	Screen manager state: mode, transitions, pause, counts
`get_tween_state`	All active tweens with target, duration, progress
`list_interactives`	Interactive hit-test regions with IDs and bounds
`list_slots`	Swappable container slots of a programmable
`list_active_programmables`	Live incremental-mode programmables with current state
`list_resources`	Loaded sprites, fonts, `.manim`, `.anim` files
`list_fonts`	Registered font names
`list_atlases`	Loaded sprite atlases and tile/sprite names
`coordinate_transform`	Convert between scene and element-local coordinates
`check_overlaps`	Detect overlapping interactives/visuals to find layout bugs

Screenshots

Tool	Description
`screenshot`	Capture current frame as PNG (optional `width`/`height` scale-down)

State manipulation

Tool	Description
`set_parameter`	Modify a programmable parameter at runtime (incremental mode)
`get_parameters`	Current parameter values and definitions for a programmable
`set_visibility`	Toggle element visibility
`reload`	Hot-reload `.manim` files (specific file or all changed)
`eval_manim`	Parse and validate `.manim` snippets

Game control

Tool	Description
`pause`	Pause/resume the game loop
`step`	Advance N frames while paused (max 100)
`wait_for_idle`	Check if no tweens/transitions are active
`quit`	Cleanly shut down the game

Input injection

Tool	Description
`send_event`	Inject a single mouse/keyboard/wheel event
`send_events`	Sequence of events with frame steps (drag, scrub, multi-step gestures)
`click_button`	Click an interactive by ID, bypassing hit testing

Diagnostics

Tool	Description
`get_traces`	Recent `trace()` output (ring buffer)
`get_errors`	Accumulated runtime errors/exceptions
`get_debugger_hits`	Poll `DevBridge.debugger(data, pause?)` breakpoint hits (cursor-based)

Breakpoints from game code

Call DevBridge.debugger(data, pause) anywhere in your game code to capture a data snapshot (with auto-captured file/line/method):

screenManager.devBridge.debugger({hp: unit.hp, target: unit.target?.name});     // pauses by default
screenManager.devBridge.debugger({fps: hxd.Timer.fps()}, false);                 // push-only, no pause

Hits are delivered two ways:

Push — real-time debugger SSE events surfaced as warning-level MCP log notifications.
Poll — get_debugger_hits tool with since_id cursor (in case the agent missed the push).

If pause=true, resume with pause({paused:false}).

Usage

Claude Code

// .mcp.json
{
  "mcpServers": {
    "hx-multianim": {
      "command": "npx",
      "args": ["-y", "@bh213/hx-multianim-mcp"]
    }
  }
}

Environment variables

Variable	Default	Description
`HX_DEV_PORT`	`9001`	DevBridge port
`HX_DEV_HOST`	`localhost`	DevBridge host

License

BSD-3-Clause

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