Graph Overlay Inspector: lay a P&ID's extracted knowledge graph on top of the drawing and check it tag by tag
You inspect the graph on the drawing it came from, run SPARQL with the results shown on the sheet, and send fixes back into the graph through a change log. It runs as a Claude artifact or a single HTML file, and Claude features bill the viewer's own account or API key.
For engineers digitizing P&IDs: see where an AI extraction is wrong before anyone builds on it.