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Implementations </span> </a> <nav class="md-nav" aria-label="Existing Implementations"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#1-neka-natfreecad-mcp-380-stars" class="md-nav__link"> <span class="md-ellipsis"> 1. neka-nat/freecad-mcp (380+ stars) </span> </a> </li> <li class="md-nav__item"> <a href="#2-jango-blockchainedmcp-freecad" class="md-nav__link"> <span class="md-ellipsis"> 2. jango-blockchained/mcp-freecad </span> </a> </li> <li class="md-nav__item"> <a href="#3-contextformfreecad-mcp" class="md-nav__link"> <span class="md-ellipsis"> 3. contextform/freecad-mcp </span> </a> </li> <li class="md-nav__item"> <a href="#4-atoi-mingfreecad-mcp" class="md-nav__link"> <span class="md-ellipsis"> 4. ATOI-Ming/FreeCAD-MCP </span> </a> </li> <li class="md-nav__item"> <a href="#5-bonninrfreecad_mcp" class="md-nav__link"> <span class="md-ellipsis"> 5. bonninr/freecad_mcp </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="#feature-comparison-matrix" class="md-nav__link"> <span class="md-ellipsis"> Feature Comparison Matrix </span> </a> </li> <li class="md-nav__item"> <a href="#key-learnings-improvements-for-our-architecture" class="md-nav__link"> <span class="md-ellipsis"> Key Learnings &amp; Improvements for Our Architecture </span> </a> <nav class="md-nav" aria-label="Key Learnings &amp; Improvements for Our Architecture"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#1-communication-protocol" class="md-nav__link"> <span class="md-ellipsis"> 1. Communication Protocol </span> </a> </li> <li class="md-nav__item"> <a href="#2-thread-safe-gui-operations" class="md-nav__link"> <span class="md-ellipsis"> 2. Thread-Safe GUI Operations </span> </a> </li> <li class="md-nav__item"> <a href="#3-screenshot-capabilities" class="md-nav__link"> <span class="md-ellipsis"> 3. Screenshot Capabilities </span> </a> </li> <li class="md-nav__item"> <a href="#4-macro-development-focus" class="md-nav__link"> <span class="md-ellipsis"> 4. Macro Development Focus </span> </a> </li> <li class="md-nav__item"> <a href="#5-partdesign-integration" class="md-nav__link"> <span class="md-ellipsis"> 5. PartDesign Integration </span> </a> </li> <li class="md-nav__item"> <a href="#6-connection-resilience" class="md-nav__link"> <span class="md-ellipsis"> 6. Connection Resilience </span> </a> </li> <li class="md-nav__item"> <a href="#7-parts-library-integration" class="md-nav__link"> <span class="md-ellipsis"> 7. Parts Library Integration </span> </a> </li> <li class="md-nav__item"> <a href="#8-comprehensive-logging" class="md-nav__link"> <span class="md-ellipsis"> 8. Comprehensive Logging </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="#updated-architecture-decisions" class="md-nav__link"> <span class="md-ellipsis"> Updated Architecture Decisions </span> </a> </li> <li class="md-nav__item"> <a href="#sources" class="md-nav__link"> <span class="md-ellipsis"> Sources </span> </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5"> <label class="md-nav__link" for="__nav_5" id="__nav_5_label" tabindex="0"> <span class="md-ellipsis"> API Reference </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_5_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_5"> <span class="md-nav__icon md-icon"></span> API Reference </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../api/server/" class="md-nav__link"> <span class="md-ellipsis"> Server </span> </a> </li> <li class="md-nav__item"> <a href="../api/bridge/" class="md-nav__link"> <span class="md-ellipsis"> Bridge </span> </a> </li> <li class="md-nav__item"> <a href="../api/config/" class="md-nav__link"> <span class="md-ellipsis"> Config </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_6"> <label class="md-nav__link" for="__nav_6" id="__nav_6_label" tabindex="0"> <span class="md-ellipsis"> Development </span> <span class="md-nav__icon md-icon"></span> </label> <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_6_label" aria-expanded="false"> <label class="md-nav__title" for="__nav_6"> <span class="md-nav__icon md-icon"></span> Development </label> <ul class="md-nav__list" data-md-scrollfix> <li class="md-nav__item"> <a href="../development/contributing/" class="md-nav__link"> <span class="md-ellipsis"> Contributing </span> </a> </li> <li class="md-nav__item"> <a href="../development/architecture/" class="md-nav__link"> <span class="md-ellipsis"> Architecture </span> </a> </li> <li class="md-nav__item"> <a href="../development/architecture-detailed/" class="md-nav__link"> <span class="md-ellipsis"> Detailed Architecture </span> </a> </li> <li class="md-nav__item"> <a href="../development/releasing/" class="md-nav__link"> <span class="md-ellipsis"> Release Process </span> </a> </li> <li class="md-nav__item"> <a href="../development/mkdocs-guide/" class="md-nav__link"> <span class="md-ellipsis"> MkDocs Guide </span> </a> </li> </ul> </nav> </li> </ul> </nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc"> <div class="md-sidebar__scrollwrap"> <div class="md-sidebar__inner"> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class="md-nav__title" for="__toc"> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> <li class="md-nav__item"> <a href="#existing-implementations" class="md-nav__link"> <span class="md-ellipsis"> Existing Implementations </span> </a> <nav class="md-nav" aria-label="Existing Implementations"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#1-neka-natfreecad-mcp-380-stars" class="md-nav__link"> <span class="md-ellipsis"> 1. neka-nat/freecad-mcp (380+ stars) </span> </a> </li> <li class="md-nav__item"> <a href="#2-jango-blockchainedmcp-freecad" class="md-nav__link"> <span class="md-ellipsis"> 2. jango-blockchained/mcp-freecad </span> </a> </li> <li class="md-nav__item"> <a href="#3-contextformfreecad-mcp" class="md-nav__link"> <span class="md-ellipsis"> 3. contextform/freecad-mcp </span> </a> </li> <li class="md-nav__item"> <a href="#4-atoi-mingfreecad-mcp" class="md-nav__link"> <span class="md-ellipsis"> 4. ATOI-Ming/FreeCAD-MCP </span> </a> </li> <li class="md-nav__item"> <a href="#5-bonninrfreecad_mcp" class="md-nav__link"> <span class="md-ellipsis"> 5. bonninr/freecad_mcp </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="#feature-comparison-matrix" class="md-nav__link"> <span class="md-ellipsis"> Feature Comparison Matrix </span> </a> </li> <li class="md-nav__item"> <a href="#key-learnings-improvements-for-our-architecture" class="md-nav__link"> <span class="md-ellipsis"> Key Learnings &amp; Improvements for Our Architecture </span> </a> <nav class="md-nav" aria-label="Key Learnings &amp; Improvements for Our Architecture"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#1-communication-protocol" class="md-nav__link"> <span class="md-ellipsis"> 1. Communication Protocol </span> </a> </li> <li class="md-nav__item"> <a href="#2-thread-safe-gui-operations" class="md-nav__link"> <span class="md-ellipsis"> 2. Thread-Safe GUI Operations </span> </a> </li> <li class="md-nav__item"> <a href="#3-screenshot-capabilities" class="md-nav__link"> <span class="md-ellipsis"> 3. Screenshot Capabilities </span> </a> </li> <li class="md-nav__item"> <a href="#4-macro-development-focus" class="md-nav__link"> <span class="md-ellipsis"> 4. Macro Development Focus </span> </a> </li> <li class="md-nav__item"> <a href="#5-partdesign-integration" class="md-nav__link"> <span class="md-ellipsis"> 5. PartDesign Integration </span> </a> </li> <li class="md-nav__item"> <a href="#6-connection-resilience" class="md-nav__link"> <span class="md-ellipsis"> 6. Connection Resilience </span> </a> </li> <li class="md-nav__item"> <a href="#7-parts-library-integration" class="md-nav__link"> <span class="md-ellipsis"> 7. Parts Library Integration </span> </a> </li> <li class="md-nav__item"> <a href="#8-comprehensive-logging" class="md-nav__link"> <span class="md-ellipsis"> 8. Comprehensive Logging </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item"> <a href="#updated-architecture-decisions" class="md-nav__link"> <span class="md-ellipsis"> Updated Architecture Decisions </span> </a> </li> <li class="md-nav__item"> <a href="#sources" class="md-nav__link"> <span class="md-ellipsis"> Sources </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="freecad-robust-mcp-server-comparison-analysis">FreeCAD Robust MCP Server Comparison Analysis<a class="headerlink" href="#freecad-robust-mcp-server-comparison-analysis" title="Permanent link"></a></h1> <p>This document analyzes existing FreeCAD Robust MCP server implementations to identify best practices and improvements for our architecture.</p> <h2 id="existing-implementations">Existing Implementations<a class="headerlink" href="#existing-implementations" title="Permanent link"></a></h2> <h3 id="1-neka-natfreecad-mcp-380-stars">1. <a href="https://github.com/neka-nat/freecad-mcp">neka-nat/freecad-mcp</a> (380+ stars)<a class="headerlink" href="#1-neka-natfreecad-mcp-380-stars" title="Permanent link"></a></h3> <p><strong>Architecture:</strong></p> <ul> <li>XML-RPC server running inside FreeCAD (port 9875)</li> <li>Queue-based GUI communication for thread safety</li> <li>FastMCP-based MCP server connecting via XML-RPC</li> </ul> <p><strong>Key Features:</strong></p> <ul> <li><code>create_object()</code> supports Part::, Draft::, PartDesign::, Fem:: types</li> <li><code>get_view()</code> captures screenshots with multiple perspectives</li> <li><code>insert_part_from_library()</code> for part library access</li> <li>Smart screenshot handling (detects unsupported views like TechDraw)</li> </ul> <p><strong>Strengths:</strong></p> <ul> <li>Thread-safe queue system for GUI operations</li> <li>Comprehensive object type support</li> <li>Screenshot capabilities with view selection</li> <li>Parts library integration</li> </ul> <p><strong>Weaknesses:</strong></p> <ul> <li>XML-RPC only (no embedded/headless mode)</li> <li>No macro development tools</li> <li>Limited debugging capabilities</li> </ul> <hr> <h3 id="2-jango-blockchainedmcp-freecad">2. <a href="https://github.com/jango-blockchained/mcp-freecad">jango-blockchained/mcp-freecad</a><a class="headerlink" href="#2-jango-blockchainedmcp-freecad" title="Permanent link"></a></h3> <p><strong>Architecture:</strong></p> <ul> <li>6 connection modes: Launcher, Server, Bridge, RPC, Wrapper, Mock</li> <li>FastMCP 2.13.0+ with FastAPI integration</li> <li>Multi-provider AI support (Claude, OpenAI, Google, OpenRouter)</li> </ul> <p><strong>Key Features:</strong></p> <ul> <li>AppImage/AppRun launcher integration</li> <li>Connection recovery mechanisms</li> <li>Resource caching and performance diagnostics</li> <li>Modern GUI addon with real-time diagnostics</li> </ul> <p><strong>Strengths:</strong></p> <ul> <li>Most flexible connection options</li> <li>Multi-AI provider support</li> <li>Performance monitoring</li> <li>Connection recovery/resilience</li> </ul> <p><strong>Weaknesses:</strong></p> <ul> <li>Complex setup with many moving parts</li> <li>Heavier dependency footprint</li> </ul> <hr> <h3 id="3-contextformfreecad-mcp">3. <a href="https://github.com/contextform/freecad-mcp">contextform/freecad-mcp</a><a class="headerlink" href="#3-contextformfreecad-mcp" title="Permanent link"></a></h3> <p><strong>Architecture:</strong></p> <ul> <li>Node.js-based MCP bridge (<code>working_bridge.py</code>)</li> <li>AICopilot workbench integrated into FreeCAD</li> <li>Cross-platform installer (<code>freecad-mcp-setup</code>)</li> </ul> <p><strong>Key Features:</strong></p> <ul> <li>13 PartDesign operations (Pad, Revolution, Fillet, Chamfer, etc.)</li> <li>18 Part operations (Primitives, Booleans, Transforms)</li> <li>14 View control tools</li> <li>Automated installer with OS detection</li> </ul> <p><strong>Strengths:</strong></p> <ul> <li>Most comprehensive CAD operation coverage</li> <li>Excellent PartDesign/Part workbench integration</li> <li>Easy installation process</li> <li>Demo showcasing full workflow (house modeling)</li> </ul> <p><strong>Weaknesses:</strong></p> <ul> <li>Node.js dependency adds complexity</li> <li>Less focus on debugging/development workflows</li> </ul> <hr> <h3 id="4-atoi-mingfreecad-mcp">4. <a href="https://github.com/ATOI-Ming/FreeCAD-MCP">ATOI-Ming/FreeCAD-MCP</a><a class="headerlink" href="#4-atoi-mingfreecad-mcp" title="Permanent link"></a></h3> <p><strong>Architecture:</strong></p> <ul> <li>Server-client with stdio/TCP (port 9876)</li> <li>GUI control panel inside FreeCAD</li> <li>Macro-centric workflow</li> </ul> <p><strong>Key Features:</strong></p> <ul> <li>Macro templates (default, basic, part, sketch)</li> <li>Automatic import injection in macros</li> <li>Macro validation before execution</li> <li>View control (front, top, right, axonometric)</li> <li>Log management and report browser</li> </ul> <p><strong>Strengths:</strong></p> <ul> <li>Focus on macro development workflow</li> <li>GUI panel for easy control</li> <li>Automatic boilerplate injection</li> <li>Comprehensive logging</li> </ul> <p><strong>Weaknesses:</strong></p> <ul> <li>Macro-only focus (no direct object creation)</li> <li>Windows-centric paths in documentation</li> </ul> <hr> <h3 id="5-bonninrfreecad_mcp">5. <a href="https://github.com/bonninr/freecad_mcp">bonninr/freecad_mcp</a><a class="headerlink" href="#5-bonninrfreecad_mcp" title="Permanent link"></a></h3> <p><strong>Architecture:</strong></p> <ul> <li>Simple socket-based server</li> <li>Two primary tools: <code>get_scene_info</code> and <code>run_script</code></li> </ul> <p><strong>Key Features:</strong></p> <ul> <li>Comprehensive scene information retrieval</li> <li>Arbitrary Python code execution</li> <li>Minimal, focused API</li> </ul> <p><strong>Strengths:</strong></p> <ul> <li>Simple, easy to understand</li> <li>Full Python access via <code>run_script</code></li> <li>Lightweight</li> </ul> <p><strong>Weaknesses:</strong></p> <ul> <li>Very minimal tool set</li> <li>No specialized CAD operations</li> </ul> <hr> <h2 id="feature-comparison-matrix">Feature Comparison Matrix<a class="headerlink" href="#feature-comparison-matrix" title="Permanent link"></a></h2> <table> <thead> <tr> <th>Feature</th> <th>neka-nat</th> <th>jango</th> <th>contextform</th> <th>ATOI-Ming</th> <th>bonninr</th> <th><strong>Ours</strong></th> </tr> </thead> <tbody> <tr> <td>Headless mode</td> <td>No</td> <td>Yes</td> <td>No</td> <td>No</td> <td>No</td> <td><strong>Yes</strong></td> </tr> <tr> <td>GUI mode</td> <td>Yes</td> <td>Yes</td> <td>Yes</td> <td>Yes</td> <td>Yes</td> <td><strong>Yes</strong></td> </tr> <tr> <td>XML-RPC</td> <td>Yes</td> <td>Yes</td> <td>No</td> <td>No</td> <td>No</td> <td><strong>Yes</strong></td> </tr> <tr> <td>Socket/TCP</td> <td>No</td> <td>Yes</td> <td>No</td> <td>Yes</td> <td>Yes</td> <td><strong>Yes</strong></td> </tr> <tr> <td>Embedded Python</td> <td>No</td> <td>No</td> <td>No</td> <td>No</td> <td>No</td> <td><strong>Yes</strong></td> </tr> <tr> <td>Screenshot capture</td> <td>Yes</td> <td>Yes</td> <td>Yes</td> <td>No</td> <td>No</td> <td><strong>Yes</strong></td> </tr> <tr> <td>Parts library</td> <td>Yes</td> <td>No</td> <td>No</td> <td>No</td> <td>No</td> <td><strong>Yes</strong></td> </tr> <tr> <td>Macro support</td> <td>No</td> <td>No</td> <td>No</td> <td>Yes</td> <td>No</td> <td><strong>Yes</strong></td> </tr> <tr> <td>PartDesign tools</td> <td>Basic</td> <td>Yes</td> <td>Yes</td> <td>Via macro</td> <td>No</td> <td><strong>Yes</strong></td> </tr> <tr> <td>Boolean operations</td> <td>Yes</td> <td>Yes</td> <td>Yes</td> <td>Via macro</td> <td>No</td> <td><strong>Yes</strong></td> </tr> <tr> <td>FEM support</td> <td>Yes</td> <td>No</td> <td>No</td> <td>No</td> <td>No</td> <td><strong>Yes</strong></td> </tr> <tr> <td>Multi-AI provider</td> <td>No</td> <td>Yes</td> <td>No</td> <td>No</td> <td>No</td> <td>No</td> </tr> <tr> <td>Connection recovery</td> <td>No</td> <td>Yes</td> <td>No</td> <td>No</td> <td>No</td> <td><strong>Yes</strong></td> </tr> <tr> <td>Thread-safe GUI ops</td> <td>Yes</td> <td>Yes</td> <td>Unknown</td> <td>Unknown</td> <td>Unknown</td> <td><strong>Yes</strong></td> </tr> <tr> <td>MCP Resources</td> <td>No</td> <td>No</td> <td>No</td> <td>No</td> <td>No</td> <td><strong>Yes</strong></td> </tr> <tr> <td>MCP Prompts</td> <td>No</td> <td>No</td> <td>No</td> <td>No</td> <td>No</td> <td><strong>Yes</strong></td> </tr> </tbody> </table> <hr> <h2 id="key-learnings-improvements-for-our-architecture">Key Learnings &amp; Improvements for Our Architecture<a class="headerlink" href="#key-learnings-improvements-for-our-architecture" title="Permanent link"></a></h2> <h3 id="1-communication-protocol">1. Communication Protocol<a class="headerlink" href="#1-communication-protocol" title="Permanent link"></a></h3> <p><strong>Learning:</strong> neka-nat uses XML-RPC which is proven and reliable.</p> <p><strong>Improvement:</strong> Support both XML-RPC (for compatibility) and JSON-RPC over sockets (simpler, more modern). Add embedded mode for true headless operation.</p> <h3 id="2-thread-safe-gui-operations">2. Thread-Safe GUI Operations<a class="headerlink" href="#2-thread-safe-gui-operations" title="Permanent link"></a></h3> <p><strong>Learning:</strong> neka-nat's queue-based system is essential for GUI stability.</p> <p><strong>Improvement:</strong> Implement similar queue system with Qt timer for main thread execution:</p> <div class="language-python highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="c1"># Queue-based GUI communication</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="n">rpc_request_queue</span> <span class="o">=</span> <span class="n">queue</span><span class="o">.</span><span class="n">Queue</span><span class="p">()</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="n">rpc_response_queue</span> <span class="o">=</span> <span class="n">queue</span><span class="o">.</span><span class="n">Queue</span><span class="p">()</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="k">def</span><span class="w"> </span><span class="nf">process_gui_tasks</span><span class="p">():</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="w"> </span><span class="sd">"""Execute queued operations on main GUI thread."""</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a> <span class="k">while</span> <span class="ow">not</span> <span class="n">rpc_request_queue</span><span class="o">.</span><span class="n">empty</span><span class="p">():</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> <span class="n">task</span> <span class="o">=</span> <span class="n">rpc_request_queue</span><span class="o">.</span><span class="n">get</span><span class="p">()</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> <span class="n">result</span> <span class="o">=</span> <span class="n">task</span><span class="p">()</span>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a> <span class="n">rpc_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>
</span></code></pre></div> <h3 id="3-screenshot-capabilities">3. Screenshot Capabilities<a class="headerlink" href="#3-screenshot-capabilities" title="Permanent link"></a></h3> <p><strong>Learning:</strong> neka-nat handles unsupported view types gracefully.</p> <p><strong>Improvement:</strong> Add comprehensive view support with intelligent fallbacks:</p> <ul> <li>Multiple view angles (Isometric, Front, Top, Right, etc.)</li> <li>View type detection (skip TechDraw, Spreadsheet)</li> <li>Configurable resolution and format</li> </ul> <h3 id="4-macro-development-focus">4. Macro Development Focus<a class="headerlink" href="#4-macro-development-focus" title="Permanent link"></a></h3> <p><strong>Learning:</strong> ATOI-Ming's macro-centric approach is unique and valuable.</p> <p><strong>Improvement:</strong> Add dedicated macro tools:</p> <ul> <li><code>create_macro</code> with templates</li> <li><code>validate_macro</code> for syntax checking</li> <li><code>run_macro</code> with parameter passing</li> <li>Automatic import injection</li> </ul> <h3 id="5-partdesign-integration">5. PartDesign Integration<a class="headerlink" href="#5-partdesign-integration" title="Permanent link"></a></h3> <p><strong>Learning:</strong> contextform has the most comprehensive PartDesign coverage.</p> <p><strong>Improvement:</strong> Add specialized PartDesign tools:</p> <ul> <li>Pad, Pocket, Revolution, Groove</li> <li>Fillet, Chamfer</li> <li>Hole (with standards support)</li> <li>LinearPattern, PolarPattern</li> <li>Mirrored</li> </ul> <h3 id="6-connection-resilience">6. Connection Resilience<a class="headerlink" href="#6-connection-resilience" title="Permanent link"></a></h3> <p><strong>Learning:</strong> jango-blockchained has connection recovery mechanisms.</p> <p><strong>Improvement:</strong> Add connection health monitoring and auto-reconnect:</p> <div class="language-python highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">maintain_connection</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="w"> </span><span class="sd">"""Background task to maintain connection health."""</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a> <span class="k">while</span> <span class="bp">self</span><span class="o">.</span><span class="n">_running</span><span class="p">:</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a> <span class="k">if</span> <span class="ow">not</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_connected</span><span class="p">():</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">reconnect</span><span class="p">()</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a> <span class="k">await</span> <span class="n">asyncio</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span>
</span></code></pre></div> <h3 id="7-parts-library-integration">7. Parts Library Integration<a class="headerlink" href="#7-parts-library-integration" title="Permanent link"></a></h3> <p><strong>Learning:</strong> neka-nat provides access to FreeCAD parts library.</p> <p><strong>Improvement:</strong> Expose parts library with search and filtering.</p> <h3 id="8-comprehensive-logging">8. Comprehensive Logging<a class="headerlink" href="#8-comprehensive-logging" title="Permanent link"></a></h3> <p><strong>Learning:</strong> ATOI-Ming has excellent logging with GUI browser.</p> <p><strong>Improvement:</strong> Add structured logging with levels, rotation, and optional GUI viewer in plugin.</p> <hr> <h2 id="updated-architecture-decisions">Updated Architecture Decisions<a class="headerlink" href="#updated-architecture-decisions" title="Permanent link"></a></h2> <p>Based on this analysis, our architecture will:</p> <ol> <li> <p><strong>Support 3 connection modes:</strong></p> </li> <li> <p>Embedded (headless, in-process FreeCAD)</p> </li> <li>XML-RPC (proven, compatible with neka-nat addon)</li> <li> <p>JSON-RPC over socket (modern, simpler)</p> </li> <li> <p><strong>Implement queue-based GUI thread safety</strong> following neka-nat's pattern</p> </li> <li> <p><strong>Provide comprehensive tool coverage:</strong></p> </li> <li> <p>Execution: Python, macros</p> </li> <li>Documents: create, open, save, list</li> <li>Objects: create, edit, delete, query</li> <li>PartDesign: pad, pocket, fillet, chamfer, patterns</li> <li>Part: primitives, booleans, transforms</li> <li>Export: STEP, STL, OBJ, FreeCAD native</li> <li> <p>View: screenshot, camera control</p> </li> <li> <p><strong>Add unique features:</strong></p> </li> <li> <p>MCP Resources for document introspection</p> </li> <li>MCP Prompts for guided workflows</li> <li>Macro development toolkit</li> <li> <p>Workbench-specific tools</p> </li> <li> <p><strong>Focus on developer experience:</strong></p> </li> <li> <p>Debugging tools</p> </li> <li>Error introspection</li> <li>Console history access</li> <li>Constraint validation</li> </ol> <hr> <h2 id="sources">Sources<a class="headerlink" href="#sources" title="Permanent link"></a></h2> <ul> <li><a href="https://github.com/neka-nat/freecad-mcp">neka-nat/freecad-mcp</a></li> <li><a href="https://github.com/jango-blockchained/mcp-freecad">jango-blockchained/mcp-freecad</a></li> <li><a href="https://github.com/contextform/freecad-mcp">contextform/freecad-mcp</a></li> <li><a href="https://github.com/ATOI-Ming/FreeCAD-MCP">ATOI-Ming/FreeCAD-MCP</a></li> <li><a href="https://github.com/bonninr/freecad_mcp">bonninr/freecad_mcp</a></li> </ul> <aside class="md-source-file"> <span class="md-source-file__fact"> <span class="md-icon" title="Last update"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"></path></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-timeago" title="January 12, 2026 17:30:05 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