Hooks

Where it lives

• hooks/run-python-hook.jsGitHub ↗
  Read the script

  #!/usr/bin/env node
  "use strict";
  
  const { spawnSync } = require("child_process");
  
  function stripWrappingQuotes(value) {
    return value.replace(/^["']|["']$/g, "");
  }
  
  function pythonCandidates() {
    const candidates = [];
    if (process.env.CLAUDE_SEO_PYTHON) {
      candidates.push({
        label: "CLAUDE_SEO_PYTHON",
        exe: stripWrappingQuotes(process.env.CLAUDE_SEO_PYTHON),
        args: [],
      });
    }
    candidates.push(
      { label: "py -3", exe: "py", args: ["-3"] },
      { label: "python3", exe: "python3", args: [] },
      { label: "python", exe: "python", args: [] },
    );
    return candidates;
  }
  
  function isStoreStubOutput(text) {
    return /Microsoft Store|WindowsApps|App execution alias|was not found/i.test(text);
  }
  
  function probe(candidate) {
    const script = "import sys; print(sys.executable); print(sys.version.split()[0])";
    const result = spawnSync(candidate.exe, [...candidate.args, "-c", script], {
      encoding: "utf8",
    });
    const output = `${result.stdout || ""}\n${result.stderr || ""}`;
    return result.status === 0 && Boolean((result.stdout || "").trim()) && !isStoreStubOutput(output);
  }
  
  function main() {
    const [, , hookScript, ...hookArgs] = process.argv;
    if (!hookScript) {
      process.exit(0);
    }
  
    for (const candidate of pythonCandidates()) {
      if (!probe(candidate)) {
        continue;
      }
      const result = spawnSync(candidate.exe, [...candidate.args, hookScript, ...hookArgs], {
        stdio: "inherit",
      });
      if (result.error) {
        continue;
      }
      process.exit(result.status === null ? 1 : result.status);
    }
  
    console.error(
      "Claude SEO hook could not find Python. Tried CLAUDE_SEO_PYTHON, py -3, python3, python.",
    );
    process.exit(1);
  }
  
  main();
  

• hooks/validate-schema.pyGitHub ↗
  Read the script

  #!/usr/bin/env python3
  """Post-edit schema validation hook for Claude Code.
  
  Validates JSON-LD schema after file edits. Returns exit code 2 to block
  if critical validation errors found.
  
  Hook configuration in ~/.claude/settings.json:
  {
    "hooks": {
      "PostToolUse": [
        {
          "matcher": "Edit|Write",
          "hooks": [
            {
              "type": "command",
              "command": "node",
              "args": [
                "${CLAUDE_PLUGIN_ROOT}/hooks/run-python-hook.js",
                "${CLAUDE_PLUGIN_ROOT}/hooks/validate-schema.py",
                "${tool_input.file_path}"
              ]
            }
          ]
        }
      ]
    }
  }
  
  Note: matcher filters by tool name only (Edit, Write). The script itself
  checks if the file contains schema markup before validating.
  """
  
  import json
  import os
  import re
  import sys
  from typing import List
  
  
  def validate_jsonld(content: str) -> List[str]:
      """Validate JSON-LD blocks in HTML content."""
      errors = []
      pattern = r'<script\s+type=["\']application/ld\+json["\']\s*>(.*?)</script>'
      blocks = re.findall(pattern, content, re.DOTALL | re.IGNORECASE)
  
      if not blocks:
          return []  # No schema found; not an error
  
      for i, block in enumerate(blocks, 1):
          block = block.strip()
          try:
              data = json.loads(block)
          except json.JSONDecodeError as e:
              errors.append(f"Block {i}: Invalid JSON; {e}")
              continue
  
          if isinstance(data, list):
              for item in data:
                  errors.extend(_validate_schema_object(item, i))
          elif isinstance(data, dict):
              errors.extend(_validate_schema_object(data, i))
  
      return errors
  
  
  def _validate_schema_object(obj: dict, block_num: int) -> List[str]:
      """Validate a single schema object."""
      errors = []
      prefix = f"Block {block_num}"
  
      # Check @context
      if "@context" not in obj:
          errors.append(f"{prefix}: Missing @context")
      elif obj["@context"] not in ("https://schema.org", "http://schema.org"):
          errors.append(f"{prefix}: @context should be 'https://schema.org'")
  
      # Check @type
      if "@type" not in obj:
          errors.append(f"{prefix}: Missing @type")
  
      # Check for placeholder text
      placeholders = [
          "[Business Name]",
          "[City]",
          "[State]",
          "[Phone]",
          "[Address]",
          "[Your",
          "[INSERT",
          "REPLACE",
          "[URL]",
          "[Email]",
      ]
      text = json.dumps(obj)
      for p in placeholders:
          if p.lower() in text.lower():
              errors.append(f"{prefix}: Contains placeholder text: {p}")
  
      # Check for deprecated types
      schema_type = obj.get("@type", "")
      deprecated = {
          "HowTo": "deprecated September 2023",
          "SpecialAnnouncement": "deprecated July 31, 2025",
          "CourseInfo": "retired June 2025",
          "EstimatedSalary": "retired June 2025",
          "LearningVideo": "retired June 2025",
          "ClaimReview": "retired June 2025; fact-check rich results discontinued",
          "VehicleListing": "retired June 2025; vehicle listing structured data discontinued",
      }
      if schema_type in deprecated:
          errors.append(f"{prefix}: @type '{schema_type}' is {deprecated[schema_type]}")
  
      # Check for restricted types used incorrectly.
      # FAQPage is intentionally NOT flagged: Google retired FAQ rich results for
      # all sites (May 7, 2026), but FAQPage remains a valid Schema.org type.
      # This project makes no claim of a confirmed AI or ranking benefit.
      restricted: dict = {}
      if schema_type in restricted:
          errors.append(f"{prefix}: @type '{schema_type}' is {restricted[schema_type]}; verify site qualifies")
  
      return errors
  
  
  def _resolve_filepath():
      """File path from argv (exec-form template) or the stdin hook-event JSON.
  
      Claude Code's documented hook contract delivers the event as JSON on stdin;
      the argv template is kept for harnesses that substitute it. Whichever yields
      an existing file wins.
      """
      if len(sys.argv) > 1 and os.path.isfile(sys.argv[1]):
          return sys.argv[1]
      try:
          if not sys.stdin.isatty():
              raw = sys.stdin.read()
              if raw.strip():
                  event = json.loads(raw)
                  fp = (event.get("tool_input") or {}).get("file_path")
                  if fp and os.path.isfile(fp):
                      return fp
      except (OSError, ValueError):
          pass
      return None
  
  
  def main():
      filepath = _resolve_filepath()
      if not filepath:
          sys.exit(0)
  
      # Only validate HTML-like files
      valid_extensions = (".html", ".htm", ".jsx", ".tsx", ".vue", ".svelte", ".php", ".ejs")
      if not filepath.lower().endswith(valid_extensions):
          sys.exit(0)
  
      # File-size guard: skip files >10MB to bound memory + hook latency.
      # Real source files almost never exceed this; bigger inputs are typically
      # generated, minified bundles or accidental binary writes.
      MAX_FILE_BYTES = 10 * 1024 * 1024  # 10 MiB
      try:
          if os.path.getsize(filepath) > MAX_FILE_BYTES:
              sys.exit(0)
      except OSError:
          sys.exit(0)
  
      try:
          with open(filepath, "r", encoding="utf-8", errors="ignore") as f:
              content = f.read()
      except (OSError, IOError):
          sys.exit(0)
  
      errors = validate_jsonld(content)
  
      if not errors:
          sys.exit(0)
  
      # Categorize errors
      critical_keywords = ["placeholder", "deprecated", "retired"]
      critical = [e for e in errors if any(kw in e.lower() for kw in critical_keywords)]
      warnings = [e for e in errors if e not in critical]
  
      if warnings:
          print("⚠️  Schema validation warnings:")
          for w in warnings:
              print(f"  - {w}")
  
      if critical:
          print("🛑 Schema validation ERRORS (blocking):")
          for e in critical:
              print(f"  - {e}")
          sys.exit(2)  # Block the edit
  
      sys.exit(1)  # Warnings only; proceed
  
  
  if __name__ == "__main__":
  

Read the script before you install anything that runs on your machine. This is the one part of a plugin that acts without being asked.