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class="md-nav__list" data-md-component="toc" data-md-scrollfix> <li class="md-nav__item"> <a href="#overview" class="md-nav__link"> <span class="md-ellipsis"> Overview </span> </a> </li> <li class="md-nav__item"> <a href="#module-structure" class="md-nav__link"> <span class="md-ellipsis"> Module Structure </span> </a> </li> <li class="md-nav__item"> <a href="#bridge-architecture" class="md-nav__link"> <span class="md-ellipsis"> Bridge Architecture </span> </a> <nav class="md-nav" aria-label="Bridge Architecture"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#base-interface" class="md-nav__link"> <span class="md-ellipsis"> Base Interface </span> </a> </li> <li class="md-nav__item"> <a href="#xml-rpc-bridge-recommended" class="md-nav__link"> <span class="md-ellipsis"> XML-RPC Bridge (Recommended) </span> </a> </li> <li class="md-nav__item"> <a href="#socket-bridge" class="md-nav__link"> <span class="md-ellipsis"> Socket Bridge </span> </a> </li> <li class="md-nav__item"> <a href="#embedded-bridge" class="md-nav__link"> <span class="md-ellipsis"> Embedded Bridge </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="#workbench-addon-architecture" class="md-nav__link"> <span class="md-ellipsis"> Workbench Addon Architecture </span> </a> <nav class="md-nav" aria-label="Workbench Addon Architecture"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#thread-safety" class="md-nav__link"> <span class="md-ellipsis"> Thread Safety </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="#data-flow" class="md-nav__link"> <span class="md-ellipsis"> Data Flow </span> </a> <nav class="md-nav" aria-label="Data Flow"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#tool-execution" class="md-nav__link"> <span class="md-ellipsis"> Tool Execution </span> </a> </li> <li class="md-nav__item"> <a href="#code-execution-pattern" class="md-nav__link"> <span class="md-ellipsis"> Code Execution Pattern </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="#gui-detection" class="md-nav__link"> <span class="md-ellipsis"> GUI Detection </span> </a> </li> <li class="md-nav__item"> <a href="#configuration" class="md-nav__link"> <span class="md-ellipsis"> Configuration </span> </a> </li> <li class="md-nav__item"> <a href="#testing-strategy" class="md-nav__link"> <span class="md-ellipsis"> Testing Strategy </span> </a> <nav class="md-nav" aria-label="Testing Strategy"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#unit-tests" class="md-nav__link"> <span class="md-ellipsis"> Unit Tests </span> </a> </li> <li class="md-nav__item"> <a href="#integration-tests" class="md-nav__link"> <span class="md-ellipsis"> Integration Tests </span> </a> </li> <li class="md-nav__item"> <a href="#embedded-mode-testing" class="md-nav__link"> <span class="md-ellipsis"> Embedded Mode Testing </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="#future-considerations" class="md-nav__link"> <span class="md-ellipsis"> Future Considerations </span> </a> <nav class="md-nav" aria-label="Future Considerations"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#bundled-vs-separate-server-architecture" class="md-nav__link"> <span class="md-ellipsis"> Bundled vs. Separate Server Architecture </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="#next-steps" class="md-nav__link"> <span class="md-ellipsis"> Next Steps </span> </a> </li> </ul> </nav> </div> </div> </div> <div class="md-content" data-md-component="content"> <article class="md-content__inner md-typeset"> <h1 id="architecture">Architecture<a class="headerlink" href="#architecture" title="Permanent link">¶</a></h1> <p>This document provides a technical overview of the FreeCAD Robust MCP Server architecture.</p> <p>For the full architecture document with design decisions and rationale, see <a href="../architecture-detailed/">Detailed Architecture</a>.</p> <hr> <h2 id="overview">Overview<a class="headerlink" href="#overview" title="Permanent link">¶</a></h2> <p>The FreeCAD Robust MCP Server follows a <strong>Bridge with Adapter</strong> pattern:</p> <div class="language-text highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>┌─────────────────────────────────────────────────────────────────────────┐
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</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>│ MCP Server Layer │
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</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>│ ┌────────────────────────────────────────────────────────────────────┐ │
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</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>│ │ FastMCP Application │ │
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</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a>│ │ ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐ │ │
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</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a>│ │ │ Tools │ │ Resources│ │ Prompts │ │ Lifecycle│ │ │
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</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a>│ │ │ (82+) │ │ │ │ │ │ Manager │ │ │
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</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a>│ │ └──────────┘ └──────────┘ └──────────┘ └──────────┘ │ │
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</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a>│ └────────────────────────────────────────────────────────────────────┘ │
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</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a>│ │ │
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</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a>│ ┌────────────────────────────────────────────────────────────────────┐ │
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</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a>│ │ FreeCAD Bridge Interface │ │
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</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a>│ │ (Abstract Base Class) │ │
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</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a>│ └────────────────────────────────────────────────────────────────────┘ │
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</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a>│ ╱ │ ╲ │
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</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a>│ ┌────────────────┐ ┌────────────────┐ ┌────────────────┐ │
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</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a>│ │ EmbeddedBridge │ │ SocketBridge │ │ XMLRPCBridge │ │
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</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a>│ │ (Linux only) │ │ (JSON-RPC) │ │ (Recommended) │ │
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</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a>│ └────────────────┘ └────────────────┘ └────────────────┘ │
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</span><span id="__span-0-20"><a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a>└─────────────────────────────────────────────────────────────────────────┘
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</span></code></pre></div> <hr> <h2 id="module-structure">Module Structure<a class="headerlink" href="#module-structure" title="Permanent link">¶</a></h2> <div class="language-text highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>src/freecad_mcp/
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</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>├── __init__.py # Package entry point
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</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>├── _version.py # Version info (auto-generated)
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</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a>├── server.py # Main MCP server entry point
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</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a>├── config.py # Configuration management
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</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a>├── py.typed # PEP 561 marker for type hints
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</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>│
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</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a>├── bridge/ # FreeCAD communication layer
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</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a>│ ├── __init__.py # Bridge factory
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</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a>│ ├── base.py # Abstract bridge interface
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</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a>│ ├── embedded.py # In-process FreeCAD (Linux only)
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</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a>│ ├── socket.py # JSON-RPC socket bridge
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</span><span id="__span-1-13"><a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a>│ └── xmlrpc.py # XML-RPC bridge (recommended)
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</span><span id="__span-1-14"><a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a>│
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</span><span id="__span-1-15"><a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a>├── tools/ # MCP tool implementations
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</span><span id="__span-1-16"><a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a>│ ├── __init__.py
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</span><span id="__span-1-17"><a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a>│ ├── execution.py # Python execution & debugging
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</span><span id="__span-1-18"><a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a>│ ├── documents.py # Document management
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</span><span id="__span-1-19"><a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a>│ ├── objects.py # Object creation/manipulation
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</span><span id="__span-1-20"><a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a>│ ├── partdesign.py # PartDesign parametric modeling
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</span><span id="__span-1-21"><a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></a>│ ├── view.py # View, camera, display
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</span><span id="__span-1-22"><a id="__codelineno-1-22" name="__codelineno-1-22" href="#__codelineno-1-22"></a>│ ├── export.py # Export/import operations
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</span><span id="__span-1-23"><a id="__codelineno-1-23" name="__codelineno-1-23" href="#__codelineno-1-23"></a>│ └── macros.py # Macro management
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</span><span id="__span-1-24"><a id="__codelineno-1-24" name="__codelineno-1-24" href="#__codelineno-1-24"></a>│
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</span><span id="__span-1-25"><a id="__codelineno-1-25" name="__codelineno-1-25" href="#__codelineno-1-25"></a>├── resources/ # MCP resource implementations
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</span><span id="__span-1-26"><a id="__codelineno-1-26" name="__codelineno-1-26" href="#__codelineno-1-26"></a>│ ├── __init__.py
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</span><span id="__span-1-27"><a id="__codelineno-1-27" name="__codelineno-1-27" href="#__codelineno-1-27"></a>│ └── freecad.py # Document, console, capabilities
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</span><span id="__span-1-28"><a id="__codelineno-1-28" name="__codelineno-1-28" href="#__codelineno-1-28"></a>│
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</span><span id="__span-1-29"><a id="__codelineno-1-29" name="__codelineno-1-29" href="#__codelineno-1-29"></a>├── prompts/ # MCP prompt templates
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</span><span id="__span-1-30"><a id="__codelineno-1-30" name="__codelineno-1-30" href="#__codelineno-1-30"></a>│ ├── __init__.py
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</span><span id="__span-1-31"><a id="__codelineno-1-31" name="__codelineno-1-31" href="#__codelineno-1-31"></a>│ └── freecad.py # Modeling and debugging prompts
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</span><span id="__span-1-32"><a id="__codelineno-1-32" name="__codelineno-1-32" href="#__codelineno-1-32"></a>│
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</span><span id="__span-1-33"><a id="__codelineno-1-33" name="__codelineno-1-33" href="#__codelineno-1-33"></a>└── utils/ # Utility modules
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</span><span id="__span-1-34"><a id="__codelineno-1-34" name="__codelineno-1-34" href="#__codelineno-1-34"></a> └── __init__.py
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</span></code></pre></div> <hr> <h2 id="bridge-architecture">Bridge Architecture<a class="headerlink" href="#bridge-architecture" title="Permanent link">¶</a></h2> <h3 id="base-interface">Base Interface<a class="headerlink" href="#base-interface" title="Permanent link">¶</a></h3> <p>All bridges implement <code>FreecadBridge</code>:</p> <div class="language-python highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="k">class</span><span class="w"> </span><span class="nc">FreecadBridge</span><span class="p">(</span><span class="n">ABC</span><span class="p">):</span>
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</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a> <span class="nd">@abstractmethod</span>
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</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">connect</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> <span class="o">...</span>
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</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>
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</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a> <span class="nd">@abstractmethod</span>
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</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">disconnect</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> <span class="o">...</span>
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</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a>
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</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a> <span class="nd">@abstractmethod</span>
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</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">is_connected</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="nb">bool</span><span class="p">:</span> <span class="o">...</span>
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</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a>
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</span><span id="__span-2-11"><a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a> <span class="nd">@abstractmethod</span>
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</span><span id="__span-2-12"><a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">execute_python</span><span class="p">(</span>
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</span><span id="__span-2-13"><a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a> <span class="bp">self</span><span class="p">,</span> <span class="n">code</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">timeout_ms</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">30000</span>
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</span><span id="__span-2-14"><a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a> <span class="p">)</span> <span class="o">-></span> <span class="n">ExecutionResult</span><span class="p">:</span> <span class="o">...</span>
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</span></code></pre></div> <h3 id="xml-rpc-bridge-recommended">XML-RPC Bridge (Recommended)<a class="headerlink" href="#xml-rpc-bridge-recommended" title="Permanent link">¶</a></h3> <ul> <li>Connects to FreeCAD via XML-RPC on port 9875</li> <li>Proven, reliable protocol</li> <li>Works on all platforms</li> </ul> <h3 id="socket-bridge">Socket Bridge<a class="headerlink" href="#socket-bridge" title="Permanent link">¶</a></h3> <ul> <li>Uses JSON-RPC over TCP sockets on port 9876</li> <li>Lower overhead than XML-RPC</li> <li>Easier to debug (JSON format)</li> </ul> <h3 id="embedded-bridge">Embedded Bridge<a class="headerlink" href="#embedded-bridge" title="Permanent link">¶</a></h3> <ul> <li>Imports FreeCAD directly into the MCP server process</li> <li><strong>Linux only</strong> (crashes on macOS/Windows)</li> <li>Fastest execution (no IPC overhead)</li> <li>Headless mode only</li> </ul> <hr> <h2 id="workbench-addon-architecture">Workbench Addon Architecture<a class="headerlink" href="#workbench-addon-architecture" title="Permanent link">¶</a></h2> <p>The workbench addon runs inside FreeCAD:</p> <div class="language-text highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>addon/FreecadRobustMCPBridge/
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</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>├── Init.py # Module initialization
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</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>├── InitGui.py # GUI initialization (workbench)
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</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a>├── FreecadRobustMCPBridge.svg # Workbench icon
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</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a>└── freecad_mcp_bridge/ # Bridge plugin
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</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a> ├── __init__.py
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</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a> ├── server.py # XML-RPC/JSON-RPC server
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</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a> ├── blocking_bridge.py # Blocking server (keeps FreeCAD running)
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</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a> └── startup_bridge.py # Non-blocking startup (for interactive GUI)
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</span><span id="__span-3-10"><a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a>
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</span><span id="__span-3-11"><a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a>package.xml # FreeCAD addon metadata (in project root)
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</span></code></pre></div> <p>Note: The <code>package.xml</code> file is in the project root, not inside the addon directory. This is because it defines metadata for multiple components (workbench and macros) in a single manifest.</p> <h3 id="thread-safety">Thread Safety<a class="headerlink" href="#thread-safety" title="Permanent link">¶</a></h3> <p>The workbench uses a queue-based system for thread-safe GUI operations:</p> <div class="language-python highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="c1"># Operations queued from network thread</span>
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</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="n">request_queue</span><span class="o">.</span><span class="n">put</span><span class="p">(</span><span class="n">operation</span><span class="p">)</span>
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</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a>
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</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="c1"># Executed on main GUI thread via QTimer</span>
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</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a><span class="k">def</span><span class="w"> </span><span class="nf">process_queue</span><span class="p">():</span>
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</span><span id="__span-4-6"><a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a> <span class="k">while</span> <span class="ow">not</span> <span class="n">request_queue</span><span class="o">.</span><span class="n">empty</span><span class="p">():</span>
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</span><span id="__span-4-7"><a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a> <span class="n">op</span> <span class="o">=</span> <span class="n">request_queue</span><span class="o">.</span><span class="n">get</span><span class="p">()</span>
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</span><span id="__span-4-8"><a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a> <span class="n">result</span> <span class="o">=</span> <span class="n">op</span><span class="p">()</span>
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</span><span id="__span-4-9"><a id="__codelineno-4-9" name="__codelineno-4-9" href="#__codelineno-4-9"></a> <span class="n">response_queue</span><span class="o">.</span><span class="n">put</span><span class="p">(</span><span class="n">result</span><span class="p">)</span>
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</span></code></pre></div> <hr> <h2 id="data-flow">Data Flow<a class="headerlink" href="#data-flow" title="Permanent link">¶</a></h2> <h3 id="tool-execution">Tool Execution<a class="headerlink" href="#tool-execution" title="Permanent link">¶</a></h3> <div class="language-text highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a>1. AI Assistant sends tool request
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</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a> ↓
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</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a>2. MCP Server receives request
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</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a> ↓
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</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a>3. Tool handler prepares Python code
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</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a> ↓
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</span><span id="__span-5-7"><a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a>4. Bridge.execute_python() sends code
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</span><span id="__span-5-8"><a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a> ↓
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</span><span id="__span-5-9"><a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a>5. FreeCAD executes code (main thread)
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</span><span id="__span-5-10"><a id="__codelineno-5-10" name="__codelineno-5-10" href="#__codelineno-5-10"></a> ↓
|
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</span><span id="__span-5-11"><a id="__codelineno-5-11" name="__codelineno-5-11" href="#__codelineno-5-11"></a>6. Result returned via bridge
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</span><span id="__span-5-12"><a id="__codelineno-5-12" name="__codelineno-5-12" href="#__codelineno-5-12"></a> ↓
|
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</span><span id="__span-5-13"><a id="__codelineno-5-13" name="__codelineno-5-13" href="#__codelineno-5-13"></a>7. MCP Server formats response
|
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</span><span id="__span-5-14"><a id="__codelineno-5-14" name="__codelineno-5-14" href="#__codelineno-5-14"></a> ↓
|
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</span><span id="__span-5-15"><a id="__codelineno-5-15" name="__codelineno-5-15" href="#__codelineno-5-15"></a>8. AI Assistant receives result
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|
</span></code></pre></div> <h3 id="code-execution-pattern">Code Execution Pattern<a class="headerlink" href="#code-execution-pattern" title="Permanent link">¶</a></h3> <p>Tools generate Python code that runs in FreeCAD:</p> <div class="language-python highlight"><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="nd">@mcp</span><span class="o">.</span><span class="n">tool</span><span class="p">()</span>
|
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</span><span id="__span-6-2"><a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">create_box</span><span class="p">(</span><span class="n">length</span><span class="p">:</span> <span class="nb">float</span> <span class="o">=</span> <span class="mf">10.0</span><span class="p">,</span> <span class="o">...</span><span class="p">)</span> <span class="o">-></span> <span class="nb">dict</span><span class="p">:</span>
|
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</span><span id="__span-6-3"><a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a> <span class="n">bridge</span> <span class="o">=</span> <span class="k">await</span> <span class="n">get_bridge</span><span class="p">()</span>
|
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</span><span id="__span-6-4"><a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a>
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</span><span id="__span-6-5"><a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a> <span class="n">code</span> <span class="o">=</span> <span class="sa">f</span><span class="s1">'''</span>
|
|
</span><span id="__span-6-6"><a id="__codelineno-6-6" name="__codelineno-6-6" href="#__codelineno-6-6"></a><span class="s1">doc = FreeCAD.ActiveDocument or FreeCAD.newDocument("Unnamed")</span>
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</span><span id="__span-6-7"><a id="__codelineno-6-7" name="__codelineno-6-7" href="#__codelineno-6-7"></a><span class="s1">obj = doc.addObject("Part::Box", "Box")</span>
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</span><span id="__span-6-8"><a id="__codelineno-6-8" name="__codelineno-6-8" href="#__codelineno-6-8"></a><span class="s1">obj.Length = </span><span class="si">{</span><span class="n">length</span><span class="si">}</span>
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</span><span id="__span-6-9"><a id="__codelineno-6-9" name="__codelineno-6-9" href="#__codelineno-6-9"></a><span class="s1">doc.recompute()</span>
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</span><span id="__span-6-10"><a id="__codelineno-6-10" name="__codelineno-6-10" href="#__codelineno-6-10"></a><span class="s1">_result_ = </span><span class="se">{{</span><span class="s1">"name": obj.Name, "volume": obj.Shape.Volume</span><span class="se">}}</span>
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</span><span id="__span-6-11"><a id="__codelineno-6-11" name="__codelineno-6-11" href="#__codelineno-6-11"></a><span class="s1">'''</span>
|
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</span><span id="__span-6-12"><a id="__codelineno-6-12" name="__codelineno-6-12" href="#__codelineno-6-12"></a>
|
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</span><span id="__span-6-13"><a id="__codelineno-6-13" name="__codelineno-6-13" href="#__codelineno-6-13"></a> <span class="n">result</span> <span class="o">=</span> <span class="k">await</span> <span class="n">bridge</span><span class="o">.</span><span class="n">execute_python</span><span class="p">(</span><span class="n">code</span><span class="p">)</span>
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</span><span id="__span-6-14"><a id="__codelineno-6-14" name="__codelineno-6-14" href="#__codelineno-6-14"></a> <span class="k">return</span> <span class="n">result</span><span class="o">.</span><span class="n">result</span>
|
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</span></code></pre></div> <hr> <h2 id="gui-detection">GUI Detection<a class="headerlink" href="#gui-detection" title="Permanent link">¶</a></h2> <p>Tools check <code>FreeCAD.GuiUp</code> to handle headless mode:</p> <div class="language-python highlight"><pre><span></span><code><span id="__span-7-1"><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a><span class="n">code</span> <span class="o">=</span> <span class="sa">f</span><span class="s1">'''</span>
|
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</span><span id="__span-7-2"><a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a><span class="s1">if not FreeCAD.GuiUp:</span>
|
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</span><span id="__span-7-3"><a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a><span class="s1"> _result_ = </span><span class="se">{{</span><span class="s1">"success": False, "error": "GUI not available"</span><span class="se">}}</span>
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</span><span id="__span-7-4"><a id="__codelineno-7-4" name="__codelineno-7-4" href="#__codelineno-7-4"></a><span class="s1">else:</span>
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</span><span id="__span-7-5"><a id="__codelineno-7-5" name="__codelineno-7-5" href="#__codelineno-7-5"></a><span class="s1"> # GUI-only operations</span>
|
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</span><span id="__span-7-6"><a id="__codelineno-7-6" name="__codelineno-7-6" href="#__codelineno-7-6"></a><span class="s1"> obj.ViewObject.Visibility = True</span>
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</span><span id="__span-7-7"><a id="__codelineno-7-7" name="__codelineno-7-7" href="#__codelineno-7-7"></a><span class="s1"> _result_ = </span><span class="se">{{</span><span class="s1">"success": True</span><span class="se">}}</span>
|
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</span><span id="__span-7-8"><a id="__codelineno-7-8" name="__codelineno-7-8" href="#__codelineno-7-8"></a><span class="s1">'''</span>
|
|
</span></code></pre></div> <hr> <h2 id="configuration">Configuration<a class="headerlink" href="#configuration" title="Permanent link">¶</a></h2> <p>Configuration via environment variables:</p> <table> <thead> <tr> <th>Variable</th> <th>Default</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td><code>FREECAD_MODE</code></td> <td><code>xmlrpc</code></td> <td>Connection mode</td> </tr> <tr> <td><code>FREECAD_PATH</code></td> <td>auto</td> <td>FreeCAD lib path (embedded)</td> </tr> <tr> <td><code>FREECAD_SOCKET_HOST</code></td> <td><code>localhost</code></td> <td>Socket/XML-RPC host</td> </tr> <tr> <td><code>FREECAD_SOCKET_PORT</code></td> <td><code>9876</code></td> <td>JSON-RPC socket port</td> </tr> <tr> <td><code>FREECAD_XMLRPC_PORT</code></td> <td><code>9875</code></td> <td>XML-RPC port</td> </tr> <tr> <td><code>FREECAD_TIMEOUT_MS</code></td> <td><code>30000</code></td> <td>Execution timeout</td> </tr> </tbody> </table> <hr> <h2 id="testing-strategy">Testing Strategy<a class="headerlink" href="#testing-strategy" title="Permanent link">¶</a></h2> <h3 id="unit-tests">Unit Tests<a class="headerlink" href="#unit-tests" title="Permanent link">¶</a></h3> <ul> <li>Mock FreeCAD module</li> <li>Test bridge logic in isolation</li> <li>Run on all platforms</li> </ul> <h3 id="integration-tests">Integration Tests<a class="headerlink" href="#integration-tests" title="Permanent link">¶</a></h3> <ul> <li>Use FreeCAD AppImage in CI</li> <li>Test actual FreeCAD operations</li> <li>Run in headless mode</li> </ul> <h3 id="embedded-mode-testing">Embedded Mode Testing<a class="headerlink" href="#embedded-mode-testing" title="Permanent link">¶</a></h3> <p>Embedded mode receives <strong>minimal testing</strong>:</p> <ul> <li>Unit tests with mocked FreeCAD</li> <li>No CI integration tests (would require Linux + FreeCAD in-process)</li> <li>Recommended to use xmlrpc/socket modes for production</li> </ul> <hr> <h2 id="future-considerations">Future Considerations<a class="headerlink" href="#future-considerations" title="Permanent link">¶</a></h2> <h3 id="bundled-vs-separate-server-architecture">Bundled vs. Separate Server Architecture<a class="headerlink" href="#bundled-vs-separate-server-architecture" title="Permanent link">¶</a></h3> <p>The current architecture keeps the MCP server separate from the FreeCAD addon/workbench. This section documents the trade-offs and potential future directions.</p> <h4 id="current-approach-separate-components">Current Approach: Separate Components<a class="headerlink" href="#current-approach-separate-components" title="Permanent link">¶</a></h4> <div class="language-text highlight"><pre><span></span><code><span id="__span-8-1"><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a>┌─────────────────┐ XML-RPC/Socket ┌─────────────────┐
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</span><span id="__span-8-2"><a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a>│ MCP Server │◄──────────────────────►│ FreeCAD │
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</span><span id="__span-8-3"><a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a>│ (separate venv) │ │ (+ Workbench) │
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</span><span id="__span-8-4"><a id="__codelineno-8-4" name="__codelineno-8-4" href="#__codelineno-8-4"></a>└─────────────────┘ └─────────────────┘
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</span></code></pre></div> <p><strong>Advantages:</strong></p> <ul> <li>Server runs in its own Python environment with full control over dependencies</li> <li>Allows remote server scenarios (AI/server on powerful machine, FreeCAD on workstation)</li> <li>Server can be updated independently of the addon</li> <li>No dependency conflicts with FreeCAD's embedded Python</li> <li>Easier testing and development</li> </ul> <p><strong>Disadvantages:</strong></p> <ul> <li>Users must install two components separately</li> <li>More complex setup process</li> <li>Need to manage version compatibility between server and workbench</li> </ul> <h4 id="potential-future-bundled-server-in-addon">Potential Future: Bundled Server in Addon<a class="headerlink" href="#potential-future-bundled-server-in-addon" title="Permanent link">¶</a></h4> <div class="language-text highlight"><pre><span></span><code><span id="__span-9-1"><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a>┌─────────────────────────────────────────┐
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</span><span id="__span-9-2"><a id="__codelineno-9-2" name="__codelineno-9-2" href="#__codelineno-9-2"></a>│ FreeCAD Addon │
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</span><span id="__span-9-3"><a id="__codelineno-9-3" name="__codelineno-9-3" href="#__codelineno-9-3"></a>│ ┌─────────────┐ ┌─────────────────┐ │
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</span><span id="__span-9-4"><a id="__codelineno-9-4" name="__codelineno-9-4" href="#__codelineno-9-4"></a>│ │ Workbench │◄──►│ Bundled Server │ │
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</span><span id="__span-9-5"><a id="__codelineno-9-5" name="__codelineno-9-5" href="#__codelineno-9-5"></a>│ │ (GUI) │ │ (subprocess) │ │
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</span><span id="__span-9-6"><a id="__codelineno-9-6" name="__codelineno-9-6" href="#__codelineno-9-6"></a>│ └─────────────┘ └─────────────────┘ │
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</span><span id="__span-9-7"><a id="__codelineno-9-7" name="__codelineno-9-7" href="#__codelineno-9-7"></a>└─────────────────────────────────────────┘
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</span></code></pre></div> <p>A bundled approach could:</p> <ul> <li>Provide single-install experience from FreeCAD Addon Manager</li> <li>Auto-start server when workbench loads</li> <li>Still support "Remote Server" mode for advanced users via preferences</li> </ul> <p><strong>Implementation considerations:</strong></p> <ol> <li><strong>Dependency management</strong>: Server requires <code>fastmcp</code>, <code>httpx</code>, <code>uvicorn</code>, etc. These may conflict with FreeCAD's Python. Options:</li> <li>Bundle dependencies in addon (vendor them)</li> <li>Use subprocess with bundled <code>requirements.txt</code> and pip install on first run</li> <li> <p>Create a minimal server that uses only stdlib</p> </li> <li> <p><strong>Startup modes</strong>:</p> </li> </ol> <div class="language-python highlight"><pre><span></span><code><span id="__span-10-1"><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a><span class="k">if</span> <span class="n">preferences</span><span class="o">.</span><span class="n">use_remote_server</span><span class="p">:</span>
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</span><span id="__span-10-2"><a id="__codelineno-10-2" name="__codelineno-10-2" href="#__codelineno-10-2"></a> <span class="n">connect_to</span><span class="p">(</span><span class="n">preferences</span><span class="o">.</span><span class="n">server_url</span><span class="p">)</span>
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</span><span id="__span-10-3"><a id="__codelineno-10-3" name="__codelineno-10-3" href="#__codelineno-10-3"></a><span class="k">else</span><span class="p">:</span>
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</span><span id="__span-10-4"><a id="__codelineno-10-4" name="__codelineno-10-4" href="#__codelineno-10-4"></a> <span class="c1"># Start bundled server in subprocess</span>
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</span><span id="__span-10-5"><a id="__codelineno-10-5" name="__codelineno-10-5" href="#__codelineno-10-5"></a> <span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">([</span><span class="n">sys</span><span class="o">.</span><span class="n">executable</span><span class="p">,</span> <span class="s2">"-m"</span><span class="p">,</span> <span class="s2">"robust_mcp_server"</span><span class="p">])</span>
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</span></code></pre></div> <ol> <li><strong>Hybrid approach</strong>: Default to bundled local server, but expose preferences for remote server URL (host:port) for advanced deployments.</li> </ol> <h4 id="decision">Decision<a class="headerlink" href="#decision" title="Permanent link">¶</a></h4> <p>Currently maintaining separate components because:</p> <ul> <li>Cleaner separation of concerns</li> <li>Proven reliability across platforms</li> <li>Easier to develop and test independently</li> <li>Remote server use case, while less common, is valuable for some workflows</li> </ul> <p>May revisit bundling in a future major version when:</p> <ul> <li>Dependency requirements stabilize</li> <li>User feedback indicates strong preference for single-install</li> <li>A clean subprocess-based bundling approach is validated</li> </ul> <hr> <h2 id="next-steps">Next Steps<a class="headerlink" href="#next-steps" title="Permanent link">¶</a></h2> <ul> <li><a href="../contributing/">Contributing</a> - How to contribute</li> <li><a href="../architecture-detailed/">Detailed Architecture</a> - 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