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freecad-mcp

by DaveEdge1

FreeCAD MCP

This repository is a FreeCAD MCP that allows you to control FreeCAD from Claude Desktop.

Demo

Design a flange

demo

Design a toy car

demo

Design a part from 2D drawing

Input 2D drawing

input

Demo

demo

This is the conversation history. https://claude.ai/share/7b48fd60-68ba-46fb-bb21-2fbb17399b48

Related MCP server: FreeCAD MCP

Install addon

FreeCAD Addon directory is

  • Windows: %APPDATA%\FreeCAD\Mod\

  • Mac: ~/Library/Application\ Support/FreeCAD/Mod/

  • Linux:

    • Ubuntu: ~/.FreeCAD/Mod/ or ~/snap/freecad/common/Mod/ (if you install FreeCAD from snap)

    • Debian: ~/.local/share/FreeCAD/Mod

Please put addon/FreeCADMCP directory to the addon directory.

git clone https://github.com/neka-nat/freecad-mcp.git
cd freecad-mcp
cp -r addon/FreeCADMCP ~/.FreeCAD/Mod/

When you install addon, you need to restart FreeCAD. You can select "MCP Addon" from Workbench list and use it.

workbench_list

And you can start RPC server by "Start RPC Server" command in "FreeCAD MCP" toolbar.

start_rpc_server

Setting up Claude Desktop

Pre-installation of the uvx is required.

And you need to edit Claude Desktop config file, claude_desktop_config.json.

For user.

{
  "mcpServers": {
    "freecad": {
      "command": "uvx",
      "args": [
        "freecad-mcp"
      ]
    }
  }
}

If you want to save token, you can set only_text_feedback to true and use only text feedback.

{
  "mcpServers": {
    "freecad": {
      "command": "uvx",
      "args": [
        "freecad-mcp",
        "--only-text-feedback"
      ]
    }
  }
}

For developer. First, you need clone this repository.

git clone https://github.com/neka-nat/freecad-mcp.git
{
  "mcpServers": {
    "freecad": {
      "command": "uv",
      "args": [
        "--directory",
        "/path/to/freecad-mcp/",
        "run",
        "freecad-mcp"
      ]
    }
  }
}

Tools

  • create_document: Create a new document in FreeCAD.

  • create_object: Create a new object in FreeCAD.

  • edit_object: Edit an object in FreeCAD.

  • delete_object: Delete an object in FreeCAD.

  • execute_code: Execute arbitrary Python code in FreeCAD.

  • insert_part_from_library: Insert a part from the parts library.

  • get_view: Get a screenshot of the active view.

  • get_objects: Get all objects in a document.

  • get_object: Get an object in a document.

  • get_parts_list: Get the list of parts in the parts library.

Contributors

Made with contrib.rocks.

Available Tools

11 tools
create_documentA

Create a new document in FreeCAD.

Args:
    name: The name of the document to create.

Returns:
    A message indicating the success or failure of the document creation.

Examples:
    If you want to create a document named "MyDocument", you can use the following data.
    ```json
    {
        "name": "MyDocument"
    }
    ```
ParametersJSON Schema
NameRequiredDescriptionDefault
nameYes

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A3.6/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Description only states basic operation and return type. No annotations provided, so description carries full burden. Missing details on side effects, permissions, or error conditions.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

First sentence states purpose effectively, but the docstring format (Args, Returns, Examples) adds unnecessary verbosity. Could be more concise.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity (1 param, output schema exists), description covers purpose, parameter meaning, and example. However, lacks details on failure scenarios.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema has 0% description coverage; the description adds meaning by stating that 'name' is the name of the document, with an example. This compensates for the bare schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clear verb 'Create' and resource 'document' in FreeCAD. Distinguished from siblings like create_object and list_documents.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No explicit when-to-use or when-not-to-use guidance. Usage is implied by the purpose but lacks context for alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

create_objectA

Create a new object in FreeCAD. Object type is starts with "Part::" or "Draft::" or "PartDesign::" or "Fem::".

Args:
    doc_name: The name of the document to create the object in.
    obj_type: The type of the object to create (e.g. 'Part::Box', 'Part::Cylinder', 'Draft::Circle', 'PartDesign::Body', etc.).
    obj_name: The name of the object to create.
    obj_properties: The properties of the object to create.

Returns:
    A message indicating the success or failure of the object creation and a screenshot of the object.

Examples:
    If you want to create a cylinder with a height of 30 and a radius of 10, you can use the following data.
    ```json
    {
        "doc_name": "MyCylinder",
        "obj_name": "Cylinder",
        "obj_type": "Part::Cylinder",
        "obj_properties": {
            "Height": 30,
            "Radius": 10,
            "Placement": {
                "Base": {
                    "x": 10,
                    "y": 10,
                    "z": 0
                },
                "Rotation": {
                    "Axis": {
                        "x": 0,
                        "y": 0,
                        "z": 1
                    },
                    "Angle": 45
                }
            },
            "ViewObject": {
                "ShapeColor": [0.5, 0.5, 0.5, 1.0]
            }
        }
    }
    ```

    If you want to create a circle with a radius of 10, you can use the following data.
    ```json
    {
        "doc_name": "MyCircle",
        "obj_name": "Circle",
        "obj_type": "Draft::Circle",
    }
    ```

    If you want to create a FEM analysis, you can use the following data.
    ```json
    {
        "doc_name": "MyFEMAnalysis",
        "obj_name": "FemAnalysis",
        "obj_type": "Fem::AnalysisPython",
    }
    ```

    If you want to create a FEM constraint, you can use the following data.
    ```json
    {
        "doc_name": "MyFEMConstraint",
        "obj_name": "FemConstraint",
        "obj_type": "Fem::ConstraintFixed",
        "analysis_name": "MyFEMAnalysis",
        "obj_properties": {
            "References": [
                {
                    "object_name": "MyObject",
                    "face": "Face1"
                }
            ]
        }
    }
    ```

    If you want to create a FEM mechanical material, you can use the following data.
    ```json
    {
        "doc_name": "MyFEMAnalysis",
        "obj_name": "FemMechanicalMaterial",
        "obj_type": "Fem::MaterialCommon",
        "analysis_name": "MyFEMAnalysis",
        "obj_properties": {
            "Material": {
                "Name": "MyMaterial",
                "Density": "7900 kg/m^3",
                "YoungModulus": "210 GPa",
                "PoissonRatio": 0.3
            }
        }
    }
    ```

    If you want to create a FEM mesh, you can use the following data.
    The `Part` property is required.
    ```json
    {
        "doc_name": "MyFEMMesh",
        "obj_name": "FemMesh",
        "obj_type": "Fem::FemMeshGmsh",
        "analysis_name": "MyFEMAnalysis",
        "obj_properties": {
            "Part": "MyObject",
            "ElementSizeMax": 10,
            "ElementSizeMin": 0.1,
            "MeshAlgorithm": 2
        }
    }
    ```
ParametersJSON Schema
NameRequiredDescriptionDefault
doc_nameYes
obj_nameYes
obj_typeYes
analysis_nameNo
obj_propertiesNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A4.2/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description mentions returns a message and screenshot but lacks details on side effects, error conditions, or permission requirements. No annotations are provided to compensate.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured with summary, Args, Returns, and Examples, but the examples are numerous and could be trimmed for conciseness while still being informative.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the complexity and presence of output schema, the description covers parameters and examples adequately. It lacks details on error handling but is otherwise complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Despite 0% schema description coverage, the description explains each parameter in Args and provides detailed examples showing usage of doc_name, obj_type, obj_name, analysis_name, and obj_properties, adding significant meaning beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states 'Create a new object in FreeCAD' and lists supported object types. It distinguishes from sibling tools like delete_object and edit_object.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides when to use the tool (creating various objects) and gives extensive examples. However, it does not explicitly mention when not to use it or alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

delete_objectA

Delete an object in FreeCAD.

Args:
    doc_name: The name of the document to delete the object from.
    obj_name: The name of the object to delete.

Returns:
    A message indicating the success or failure of the object deletion and a screenshot of the object.
ParametersJSON Schema
NameRequiredDescriptionDefault
doc_nameYes
obj_nameYes

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A3.7/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description must fully disclose behavioral traits. It mentions returning a success/failure message and screenshot but omits critical details like whether deletion is permanent, irreversible, or has cascading effects.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise and structured with a header, Args, and Returns sections. Every sentence adds value without redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description covers inputs and outputs adequately, but given the tool's destructive nature, it could mention handling of missing objects or undo capabilities. The presence of an output schema (implied by 'Returns') partially compensates.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage, the description compensates by explaining each parameter's purpose (doc_name and obj_name). This adds value beyond the schema's titles alone.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states 'Delete an object in FreeCAD' using a specific verb and resource. It distinguishes from sibling tools like create_object and list_documents by its deletion purpose.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies when to use the tool (when an object needs to be deleted) but provides no explicit guidance on when not to use it or alternatives. No exclusions or comparisons with siblings.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

edit_objectB

Edit an object in FreeCAD. This tool is used when the create_object tool cannot handle the object creation.

Args:
    doc_name: The name of the document to edit the object in.
    obj_name: The name of the object to edit.
    obj_properties: The properties of the object to edit.

Returns:
    A message indicating the success or failure of the object editing and a screenshot of the object.
ParametersJSON Schema
NameRequiredDescriptionDefault
doc_nameYes
obj_nameYes
obj_propertiesYes

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

B3.3/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description must fully convey behavior. It mentions that the tool edits an object and returns a success/failure message along with a screenshot, but lacks details on side effects, permissions, or constraints, making it minimally adequate.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is relatively concise with five sentences. It front-loads the purpose and includes argument and return descriptions. However, the second sentence could be tighter without losing clarity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the complexity (3 params, nested object), the description is lacking. It does not explain what kinds of properties can be edited, mention prerequisites (e.g., document and object must exist), or provide usage examples. The output schema exists but no details are given, though the description mentions the return format.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must add meaning. It lists three parameters but only repeats their names without providing additional semantic context or examples. The description for obj_properties is vague ('The properties of the object to edit'), failing to compensate for the lack of schema details.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

Describes editing an object in FreeCAD, which is clear. Distinguishes itself from sibling tool 'create_object' by stating it is used when create_object cannot handle creation, thereby differentiating its purpose.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly states when to use this tool (when create_object cannot handle object creation), providing clear context. However, it does not specify when not to use it or suggest alternatives beyond this sibling.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

execute_codeA

Execute arbitrary Python code in FreeCAD.

Args:
    code: The Python code to execute.

Returns:
    A message indicating the success or failure of the code execution, the output of the code execution, and a screenshot of the object.
ParametersJSON Schema
NameRequiredDescriptionDefault
codeYes

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A3.7/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries full burden. It discloses that execution can be arbitrary, and returns success/failure, output, and a screenshot. However, it omits security implications, timeouts, or side effects.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely concise: two sentences plus an Args/Returns block. It front-loads the purpose, and every sentence serves a clear function without redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the single parameter and existing output schema, the description explains the return values (message, output, screenshot) well. Minor gaps (no execution limits, environment details) prevent a 5.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, but the description only restates the parameter name and type ('code: The Python code to execute'), adding no additional meaning like format, examples, or constraints.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states 'Execute arbitrary Python code in FreeCAD' with a specific verb ('execute') and resource ('Python code'), clearly distinguishing it from sibling tools like create_object or get_view.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives, nor any exclusions or prerequisites. The description merely states what it does, leaving the agent to infer usage context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_objectB

Get an object from a document. You can use this tool to get the properties of an object to see what you can check or edit.

Args:
    doc_name: The name of the document to get the object from.
    obj_name: The name of the object to get.

Returns:
    The object and a screenshot of the object.
ParametersJSON Schema
NameRequiredDescriptionDefault
doc_nameYes
obj_nameYes

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

B3.4/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries full burden for behavioral disclosure. It mentions return value (object + screenshot) but omits details about side effects, error handling, permissions, or the non-destructive nature (implicit only).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise with no redundant information. It front-loads the purpose and uses clear section headers for arguments and returns, making it easy to scan.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple two-parameter getter tool with an existing output schema, the description covers the essential purpose, parameters, and return value. Missing error scenarios or edge cases, but overall sufficient.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, so description compensates by naming and explaining each parameter: 'doc_name' as document name, 'obj_name' as object name. This is basic but adequate; no details on format or constraints.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'Get' and resource 'object from a document,' with additional context about inspecting properties. While it doesn't explicitly contrast with sibling tools like 'get_objects', the singular form and specific language imply the distinction.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides usage context ('to get the properties of an object to see what you can check or edit'), but lacks explicit when-to-use or when-not-to-use guidance and does not mention alternatives such as 'get_objects' or 'get_view'.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_objectsB

Get all objects in a document. You can use this tool to get the objects in a document to see what you can check or edit.

Args:
    doc_name: The name of the document to get the objects from.

Returns:
    A list of objects in the document and a screenshot of the document.
ParametersJSON Schema
NameRequiredDescriptionDefault
doc_nameYes

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

B3.4/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description must disclose behavioral traits. It only says 'get', implying read-only, but does not explicitly state it. No mention of side effects, permissions, or other behaviors beyond the obvious.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise with two sentences plus an Args/Returns section. It front-loads the purpose. The second sentence ('You can use this tool...') is slightly redundant but not overly verbose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool is simple (one parameter) and an output schema exists, the description adequately covers what returns (list of objects and screenshot). It does not explain the structure of objects or screenshot details, but that is acceptable with an output schema.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The single parameter 'doc_name' has no description in the input schema (0% coverage). The description compensates by including an Args section that explains it as 'The name of the document to get the objects from.' This adds meaning beyond the schema type.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states it gets all objects in a document, using a specific verb and resource. However, it does not differentiate from sibling tools like 'get_object' (singular) or 'get_view', which limits clarity about scope.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage for inspecting objects before editing or checking them, but offers no explicit guidance on when to use this tool versus alternatives (e.g., get_object for a single object). No exclusions or prerequisites are stated.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_parts_listB

Get the list of parts in the parts library addon.

ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

B3.4/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description should disclose behavioral traits. It only states it returns a list, but lacks details on read-only nature, potential pagination, or any side effects. With no annotations, this is insufficient.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence that directly conveys the tool's purpose with no wasted words. It is appropriately concise for a simple list-retrieval tool.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with no parameters and an output schema available, the description is largely sufficient. However, it could briefly mention the return format or any limits. The presence of an output schema mitigates the lack of detail.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

There are no parameters, so the baseline is 3 due to 100% schema coverage. The description adds no parameter-related meaning beyond the schema, which is acceptable for a parameterless tool.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'Get' and the resource 'list of parts in the parts library addon', making the tool's purpose unambiguous. It distinguishes well from sibling tools like 'insert_part_from_library' which performs a write operation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives. The description does not mention any context, prerequisites, or exclusions, leaving the agent to infer usage from the tool name alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_viewA

Get a screenshot of the active view.

Args:
    view_name: The name of the view to get the screenshot of.
    The following views are available:
    - "Isometric"
    - "Front"
    - "Top"
    - "Right"
    - "Back"
    - "Left"
    - "Bottom"
    - "Dimetric"
    - "Trimetric"
    width: The width of the screenshot in pixels. If not specified, uses the viewport width.
    height: The height of the screenshot in pixels. If not specified, uses the viewport height.
    focus_object: The name of the object to focus on. If not specified, fits all objects in the view.

Returns:
    A screenshot of the active view.
ParametersJSON Schema
NameRequiredDescriptionDefault
widthNo
heightNo
view_nameYes
focus_objectNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A4.1/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Without annotations, the description carries the full burden. It correctly implies a read-only operation ('Get a screenshot') and explains defaults for width, height, and focus_object. However, it does not explicitly state safety (e.g., no destructive effects) or handling of edge cases like invalid view names.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured with clear 'Args' and 'Returns' sections. It is concise yet complete, with no redundant information. Every sentence provides necessary detail.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple screenshot tool, the description covers parameters and return value adequately. An output schema exists, so return explanation is sufficient. Minor gaps remain (e.g., error behavior, supported formats), but overall it is complete for typical use.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description fully compensates by explaining all four parameters: view_name (with enumerated options), width and height (with defaults), and focus_object (with default). This adds significant meaning beyond the schema's minimal information.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states 'Get a screenshot of the active view', which is a specific verb+resource. This purpose distinguishes it from sibling tools like get_object, delete_object, etc., as it focuses on capturing a view rather than manipulating or listing objects.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It does not mention prerequisites, limitations, or scenarios where other tools might be more appropriate. The usage context is entirely implicit.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

insert_part_from_libraryA

Insert a part from the parts library addon.

Args:
    relative_path: The relative path of the part to insert.

Returns:
    A message indicating the success or failure of the part insertion and a screenshot of the object.
ParametersJSON Schema
NameRequiredDescriptionDefault
relative_pathYes

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A3.5/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, so description carries full burden. It states it inserts a part and returns a message/screenshot, but lacks details on side effects, permissions, or failure modes. Incomplete for a mutation tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely concise with no wasted words, conveying purpose, parameter, and return in three short lines. Front-loaded with the main verb.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple 1-param tool with output schema, the description covers basics but lacks usage context and behavioral details. Adequate but not rich enough given sibling tools and no annotations.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description adds minimal meaning to 'relative_path' (says it's the path of the part to insert). Schema coverage is 0% so description compensates slightly, but it's largely restating the parameter name.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states it inserts a part from the 'parts library addon', which is a specific verb+resource. It distinguishes from siblings like 'create_object' (creates arbitrary objects) and 'get_parts_list' (lists parts), so purpose is well-defined.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage (inserting from parts library) but provides no explicit when-to-use or when-not-to-use guidance. No prerequisites or alternative tools are mentioned, so it's only adequate.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

list_documentsA

Get the list of open documents in FreeCAD.

Returns:
    A list of document names.
ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A3.6/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description must disclose behavioral traits, but it only states the return value. It does not mention whether the operation is read-only, requires FreeCAD to be running, or handle empty states, which are critical for safe invocation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely concise, consisting of a single sentence and a returns clause. It contains no unnecessary words and is front-loaded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity (no parameters, trivial output), the description is adequate. However, it could mention that the tool works only when FreeCAD is active, but the output schema likely covers return structure.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has zero parameters, so the schema is complete. The description adds no parameter details, but this is acceptable as baseline 4 for parameterless tools.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'Get' and the resource 'list of open documents', making the tool's purpose specific and unambiguous. It distinguishes itself from siblings like get_objects and get_parts_list by focusing on documents.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives, such as get_objects. There is no mention of prerequisites or exclusions, leaving the agent to infer appropriateness.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. 11 tool updatesv0.1.15
    • First observedcreate_document
    • First observedcreate_object
    • First observeddelete_object
    • First observededit_object
    • First observedexecute_code
    • First observedget_object
    • First observedget_objects
    • First observedget_parts_list
    • First observedget_view
    • First observedinsert_part_from_library
    • First observedlist_documents

TDQS

A3.8/5.0
Disambiguation4/5

Most tools have distinct purposes (create, edit, delete, list, get). The edit_object tool description mentions it is used when create_object cannot handle creation, which could cause slight confusion, but overall each tool's intent is clear.

Naming Consistency5/5

All tool names follow a consistent verb_noun pattern in snake_case, such as create_object, list_documents, get_view. Pluralization for list/get operations is appropriate and consistent.

Tool Count5/5

With 11 tools covering document management, object CRUD, viewing, parts library, and code execution, the count is well-scoped for a CAD tool server, providing necessary functionality without bloat.

Completeness4/5

Core CRUD and document operations are covered. Missing are save/close document tools, but arbitrary code execution via execute_code can fill gaps. Overall, the tool surface is reasonably complete for typical CAD workflows.

Maintenance

ActivityInactive
ResponsivenessSyncing

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