RhinoMCP: Control Rhino 3D and Grasshopper from Claude and Cursor

• Gives a quick summary of the open Rhino document

  Returns a light overview of the current file so the assistant knows what is in it before it changes anything.

  Try: “What is in my Rhino file right now?”

  Read · get_document_summary

• Lists objects in the document with filters and paging

  Queries the objects in the open document, with filters and paging so large models do not flood the chat.

  Try: “List all the curves on the Walls layer.”

  Read · get_objects

• Shows details for one object

  Returns an object's id, name, type, custom attributes and geometry details. You give it an id or a name.

  Try: “Tell me everything about the object named "roof".”

  Read · get_object_info

• Describes what you have selected in Rhino

  Returns the same detail as the single-object lookup, but for whatever is selected right now.

  Try: “Describe the objects I have selected.”

  Read · get_selected_objects_info

• Selects objects by name, color or category

  Selects objects in the document using filters such as name, color or category, combined with AND or OR.

  Try: “Select every red object on the Furniture layer.”

  Write · select_objects

• Reads an object's name, layer and custom notes

  Returns light metadata for an object plus its custom user strings.

  Try: “What user strings are set on the selected object?”

  Read · get_object_attributes

• Edits an object's name, layer and custom notes

  Changes object metadata and custom user strings without touching its geometry.

  Try: “Add a user string "material=oak" to the table.”

  Write · update_object_attributes

• Creates one shape in Rhino

  Creates a single object such as a point, line, box, sphere, cylinder or curve in the open document.

  Try: “Draw a box 4 by 2 by 1 at the origin.”

  Write · create_object

• Creates many shapes in one go

  Creates several objects in a single call, which is faster than adding them one at a time.

  Try: “Create a 5 by 5 grid of spheres, 2 units apart.”

  Write · create_objects

• Moves, rotates, scales or recolors one object

  Applies a transform, color or visibility change to an existing object chosen by id or name.

  Try: “Rotate the selected box 90 degrees around the Z axis.”

  Write · modify_object

• Edits many objects at once

  Applies color, move, rotate, scale or visibility changes to a list of objects, or to all objects at once. Its built-in help text is a copy of the create tool's.

  Try: “Turn every sphere blue.”

  Write · modify_objects

• Deletes an object from the document

  Removes an object from the Rhino document. It is marked destructive.

  Try: “Delete the object named "temp_box".”

  Delete · delete_object

• Adds a layer

  Creates a new layer in the document.

  Try: “Create a layer called Glazing.”

  Write · create_layer

• Reads or changes the active layer

  Returns the current layer, or makes another layer current when you give a name or id.

  Try: “Switch to the Walls layer.”

  Write · get_or_set_current_layer

• Deletes a layer

  Deletes a layer by name or id. It is marked destructive.

  Try: “Delete the layer called Old Drafts.”

  Delete · delete_layer

• Checks objects are valid and measures them

  Reports whether objects are valid and gives common measurements such as length, area, volume and bounding boxes.

  Try: “Is the selected solid valid, and what is its volume?”

  Read · analyze_objects

• Measures how two objects relate in space

  Reports the spatial relationship between two objects, such as distance between them.

  Try: “How far apart are the two columns?”

  Read · measure_objects

• Cuts a section through objects and measures it

  Cuts a plane through objects and measures each cross-section without creating anything in the document.

  Try: “Cut a section at height 3 and tell me the area.”

  Read · section_profile

• Joins solids into one

  Combines several solid objects into a single solid.

  Try: “Union the two boxes into one solid.”

  Write · boolean_union

• Subtracts solids from a base solid

  Subtracts one or more objects from a base object.

  Try: “Cut the cylinder out of the block.”

  Write · boolean_difference

• Keeps only the overlapping volume

  Keeps just the volume where the given solids overlap.

  Try: “Keep only the part where the sphere and box overlap.”

  Write · boolean_intersection

• Builds a surface through several curves

  Creates a loft surface that passes through multiple curves.

  Try: “Loft a surface through these three circles.”

  Write · loft

• Pushes a curve into a surface or solid

  Extrudes a curve along a direction vector to make a surface or a solid.

  Try: “Extrude this rectangle 10 units up.”

  Write · extrude_curve

• Sweeps shapes along a rail curve

  Sweeps one or more profile curves along a single rail curve.

  Try: “Sweep this circle along the spiral curve.”

  Write · sweep1

• Offsets a curve by a distance

  Creates a copy of a curve offset by the distance you give.

  Try: “Offset the outline 0.5 units inward.”

  Write · offset_curve

• Wraps a tube around a curve

  Creates a pipe (tube) along a curve.

  Try: “Make a pipe of radius 0.2 along this curve.”

  Write · pipe

• Makes a flat face from closed boundary curves

  Creates one planar face from closed curves that lie in the same plane.

  Try: “Make a flat face from these closed outlines.”

  Write · create_planar_region

• Projects a curve onto surfaces or meshes

  Projects a curve onto surfaces, polysurfaces or meshes.

  Try: “Project this curve down onto the terrain.”

  Write · project_curve

• Finds where two curves cross

  Finds intersection points or overlap curves between two curves.

  Try: “Where do these two curves intersect?”

  Write · intersect_curves

• Cuts a curve at points or parameters

  Splits a curve at parameters or points you specify.

  Try: “Split this curve at its midpoint.”

  Write · split_curve

• Takes a screenshot of a Rhino view

  Captures a viewport as an image so the assistant can look at the model. You choose the view, size, grid and axes.

  Try: “Show me the front view of the model.”

  Read · capture_viewport

• Runs any Rhino command

  Runs a Rhino command string and returns what the command window prints. On by default; RHINO_MCP_ENABLE_RUN_COMMAND=0 turns it off.

  Try: “Run the Rhino command that joins all curves.”

  Delete · run_command

• Runs Python code inside Rhino

  Runs RhinoScript Python code in the open Rhino session. On by default; RHINO_MCP_ENABLE_RHINOSCRIPT=0 turns it off.

  Try: “Write a script that renames every layer in lowercase.”

  Delete · execute_rhinoscript_python_code

• Runs C# code inside Rhino

  Runs RhinoCommon C# code in the open Rhino session. On by default; RHINO_MCP_ENABLE_CSHARP=0 turns it off.

  Try: “Use C# to compute and print the centroid of the selected mesh.”

  Delete · execute_rhinocommon_csharp_code

• Lists Rhino commands you can run

  Lists the Rhino application commands available in the current session, for use with the run-command tool.

  Try: “Which Rhino commands start with "Sweep"?”

  Read · get_commands

• Searches the RhinoScript function list

  Searches RhinoScript functions by keyword or description.

  Try: “Which RhinoScript functions work on meshes?”

  Read · search_rhinoscript_functions

• Reads RhinoScript documentation

  Returns RhinoScript documentation for a topic.

  Try: “Show me the docs for working with layers in RhinoScript.”

  Read · get_rhinoscript_docs

• Lists RhinoScript modules

  Lists the RhinoScript modules and how many functions each has.

  Try: “What RhinoScript modules exist?”

  Read · list_rhinoscript_modules

• Lists functions in one RhinoScript module

  Returns every function in a RhinoScript module with its signature.

  Try: “List the functions in the curve module.”

  Read · get_module_functions

• Reads the bundled Rhino modeling guide

  Reads a versioned Rhino modeling guide that ships with the server, by topic.

  Try: “Read the modeling guidance before you start.”

  Read · get_modeling_guidance

• Lists what this server can do

  Lists the commands the server handles, which are read-only, and whether the plugin and server versions match.

  Try: “What can this server do, and are the plugin and server versions in sync?”

  Read · describe_capabilities

• Undoes recent Rhino steps

  Undoes the last operation or several. The step count is a parameter.

  Try: “Undo the last 2 operations.”

  Write · undo

• Redoes undone Rhino steps

  Redoes the last undone operation or several.

  Try: “Redo the last step.”

  Write · redo

• Opens a Grasshopper document

  Creates or activates a Grasshopper document so later canvas commands have somewhere to work.

  Try: “Open a new Grasshopper document.”

  Write · gh_create_document

• Describes the active Grasshopper document

  Returns information about the active Grasshopper document.

  Try: “What Grasshopper file is open?”

  Read · gh_get_document_info

• Snapshots the Grasshopper canvas

  Returns a structured snapshot of everything on the active canvas.

  Try: “Show me what is on the canvas.”

  Read · gh_get_canvas_state

• Lists parts on the canvas

  Lists the components on the active Grasshopper canvas.

  Try: “List every component on the canvas.”

  Read · gh_list_components

• Details one canvas component

  Returns metadata for one object on the canvas.

  Try: “Give me the inputs and outputs of the Move component I placed.”

  Read · gh_get_component_info

• Finds Grasshopper components by name

  Searches the installed Grasshopper component library.

  Try: “Find the component that makes a circle.”

  Read · gh_search_components

• Searches several component names at once

  Searches for several component names in one call and returns ranked matches.

  Try: “Find components for Circle, Extrude and Move.”

  Read · gh_batch_search_components

• Lists component categories

  Lists installed Grasshopper categories and subcategories.

  Try: “What categories of components are installed?”

  Read · gh_list_component_categories

• Lists installed components

  Returns the installed components, optionally filtered by category.

  Try: “List the components in the Curve category.”

  Read · gh_get_available_components

• Inspects a component type before use

  Returns the inputs and outputs of a component type before you place one.

  Try: “What inputs does the Loft component take?”

  Read · gh_get_component_type_info

• Inspects several component types

  Returns the input and output maps for several component types in one call.

  Try: “Show the inputs for Loft, Pipe and Extrude.”

  Read · gh_batch_get_component_type_info

• Places a component on the canvas

  Adds a Grasshopper component to the active canvas.

  Try: “Add a number slider to the canvas.”

  Write · gh_add_component

• Changes a component's name, position or state

  Updates basic metadata, position, enabled state or preview state of a canvas object.

  Try: “Hide the preview on the Move component.”

  Write · gh_update_component

• Tidies the canvas layout

  Lays out canvas objects as a left-to-right graph following the wires.

  Try: “Clean up the layout of my definition.”

  Write · gh_layout_components

• Deletes one canvas component

  Deletes one Grasshopper canvas object. It is marked destructive.

  Try: “Delete the unused panel.”

  Delete · gh_delete_component

• Clears the Grasshopper canvas

  Deletes objects from the active canvas, including groups unless you turn that off. It is marked destructive.

  Try: “Clear the canvas.”

  Delete · gh_clear_canvas

• Wires an output to an input

  Connects one output parameter to one input parameter.

  Try: “Connect the slider to the radius input of the circle.”

  Write · gh_connect_components

• Removes a wire

  Removes one wire, or all sources from a target input.

  Try: “Disconnect the slider from the circle.”

  Write · gh_disconnect_components

• Sets a slider, toggle or panel value

  Sets the value of a slider, toggle, panel, value list or regular input.

  Try: “Set the radius slider to 5.”

  Write · gh_set_parameter_value

• Reads a Grasshopper output

  Reads structured data from an output parameter.

  Try: “What does the Area output say?”

  Read · gh_get_parameter_value

• Builds a whole definition in one call

  Creates and wires a full graph in one batched canvas operation.

  Try: “Build a point attractor pattern with cylinders.”

  Write · gh_build_graph

• Edits and rewires a graph in one call

  Batch edits, rewires and verifies an existing or new graph.

  Try: “Change the grid to 8 by 8 and rewire the heights.”

  Write · gh_mutate_graph

• Inspects a graph by its id

  Returns every Grasshopper object tagged with a graph id.

  Try: “Show me graph "attractor-1".”

  Read · gh_get_graph

• Deletes a graph by its id

  Deletes all Grasshopper objects tagged with a graph id. It is marked destructive.

  Try: “Remove graph "attractor-1".”

  Delete · gh_clear_graph

• Solves the definition

  Runs a Grasshopper solution and reports runtime warnings and errors.

  Try: “Solve it and tell me about any errors.”

  Write · gh_run_solution

• Forces a recompute

  Expires the whole solution or selected components so they recompute.

  Try: “Recompute the whole definition.”

  Write · gh_expire_solution

• Screenshots the Grasshopper preview

  Captures the live Grasshopper preview in a Rhino viewport without baking it into the document.

  Try: “Show me the current Grasshopper preview.”

  Read · gh_capture_preview

Watch out for

• It can run code and commands inside Rhino

  Three tools run a Rhino command, RhinoScript Python or RhinoCommon C# in your open session, and all three are on by default. Set RHINO_MCP_ENABLE_RUN_COMMAND, RHINO_MCP_ENABLE_RHINOSCRIPT and RHINO_MCP_ENABLE_CSHARP to 0 in the config if you do not need them. github.com

• It can delete objects, layers and canvas parts

  Tools delete objects and layers, and clear Grasshopper components or whole graphs. Undo and redo tools exist, but save a copy of your file first. github.com

• The link to Rhino has no password

  The server and plugin talk over an unauthenticated TCP link on 127.0.0.1:1999. Keep it on the local machine, as the README says, and never expose that port. github.com

• Only one server at a time

  The README says to run one RhinoMCP server at a time, not one per AI app. github.com

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