{"record":{"id":"6560b1719c21c54e","repo":"Graphify-Labs/graphify","slug":"error-graph-is-empty-extraction-produced-no-nod-6560b1","errorCode":null,"errorMessage":"ERROR: Graph is empty - extraction produced no nodes.","messagePattern":"ERROR: Graph is empty - extraction produced no nodes\\.","errorType":"console","errorClass":"SystemExit","httpStatus":null,"severity":"error","filePath":"tools/skillgen/expected/graphify__skill-claw.md","lineNumber":419,"sourceCode":"from graphify.build import build_from_json\nfrom graphify.cluster import cluster, score_all\nfrom graphify.analyze import god_nodes, surprising_connections, suggest_questions\nfrom graphify.report import generate\nfrom graphify.export import to_json\nfrom pathlib import Path\n\nextraction = json.loads(Path('graphify-out/.graphify_extract.json').read_text(encoding=\\\"utf-8\\\"))\ndetection  = json.loads(Path('graphify-out/.graphify_detect.json').read_text(encoding=\\\"utf-8\\\"))\n\n# root= mirrors the --update runbook (#1361): relativize source_file to the same\n# base so the full build and incremental --update never drift apart on re-extract.\nG = build_from_json(extraction, root='INPUT_PATH', directed=IS_DIRECTED)\n# Guard BEFORE any write: an empty extraction must not clobber a good graph.json /\n# GRAPH_REPORT.md / analysis sidecar. Check immediately after build (#1392).\nif G.number_of_nodes() == 0:\n    print('ERROR: Graph is empty - extraction produced no nodes.')\n    print('Possible causes: all files were skipped, binary-only corpus, or extraction failed.')\n    raise SystemExit(1)\ncommunities = cluster(G)\ncohesion = score_all(G, communities)\ntokens = {'input': extraction.get('input_tokens', 0), 'output': extraction.get('output_tokens', 0)}\ngods = god_nodes(G)\nsurprises = surprising_connections(G, communities)\nlabels = {cid: 'Community ' + str(cid) for cid in communities}\n# Placeholder questions - regenerated with real labels in Step 5\nquestions = suggest_questions(G, communities, labels)\n\n# Export FIRST and honor the #479 shrink-guard: to_json returns False (writing\n# nothing) when the new graph is smaller than the existing graph.json. Only write\n# GRAPH_REPORT.md + the analysis sidecar when the graph was actually written, so\n# they never describe a graph that graph.json doesn't contain (#1392).\nwrote = to_json(G, communities, 'graphify-out/graph.json')\nif not wrote:\n    print('ERROR: refused to shrink graphify-out/graph.json (existing graph has more nodes; #479).')\n    print('If this shrink is intentional (you deleted files), re-run a full build with --force.')\n    raise SystemExit(1)","sourceCodeStart":401,"sourceCodeEnd":437,"githubUrl":"https://github.com/Graphify-Labs/graphify/blob/7fe58b0b0f3873be9a21c30106b8b8527c353aa6/tools/skillgen/expected/graphify__skill-claw.md#L401-L437","documentation":"The empty-graph guard in the generated 'claw' host render of the graphify skill (tools/skillgen/expected/graphify__skill-claw.md), byte-for-byte the same logic as skill.md's Step 4: after build_from_json(extraction, root='INPUT_PATH'), a zero-node graph triggers this error and SystemExit(1) before any artifact is written, per #1392.","triggerScenarios":"Executing the claw skill's Step 4 with an extraction JSON that yields zero nodes — everything skipped by ignore rules, a binary-only corpus, or failed extraction.","commonSituations":"Empty/ignored input tree; wrong INPUT_PATH; extraction output empty after upstream API errors.","solutions":["Re-run extraction (Step 3) and verify graphify-out/.graphify_extract.json contains nodes","Confirm the input path has extractable files and .graphifyignore is not over-broad","Remove a truncated extraction JSON and re-extract"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"extraction = json.loads(Path('graphify-out/.graphify_extract.json').read_text(encoding='utf-8'))\nif not (extraction.get('nodes') or extraction.get('entities')):\n    raise SystemExit('extraction empty — re-run Step 3 before the claw build step')\nG = build_from_json(extraction, root='INPUT_PATH', directed=IS_DIRECTED)","typeGuard":"def extraction_has_nodes(extraction: dict) -> bool:\n    return bool(extraction.get('nodes') or extraction.get('entities'))","tryCatchPattern":null,"preventionTips":["Confirm non-empty extraction JSON before building in the claw skill","Keep corpus and ignore patterns stable between extraction and build","Abort extraction early on empty results"],"tags":["graphify","generated-skill","guard","empty-state","claw"],"backgroundTag":null,"analyzedSha":"7fe58b0b0f3873be9a21c30106b8b8527c353aa6","analyzedAt":"2026-08-14T19:23:21.323Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}