Voice Multimodal Signature Page Detector

Signature Page Detector

What it does

Legal documents are only as good as their execution. A contract with missing signatures, absent witnesses, or an unfilled notary block may be unenforceable. This skill detects all execution-related elements in a legal document — whether the input is a native-text PDF, a scanned document (after OCR via [[voice-multimodal-scanned-pdf-handler]]), or a set of page images — and produces a structured execution status report.

Detection patterns

Text-based signature block detection (native text PDFs)

Signature blocks contain recognizable text markers. Detect:

Visual signature detection (scanned documents and images)

When processing image content:

• Signature lines: horizontal underscores or printed lines followed by or preceded by a name/title field.
• Handwritten signatures: visual strokes that deviate from printed text — irregular baseline, variable stroke width, cursive-style marks.
• Initials on pages: short handwritten marks at bottom corners of pages (required in many MENA jurisdictions for multi-page contracts).
• Rubber stamps / corporate seals: circular or rectangular impression marks, often with company name text around the rim.
• Electronic signature markers: DocuSign completion flags ("Signed by [Name] [ID]"), Adobe Acrobat signature fields with completion status, HelloSign blue completion banners.
• MENA e-signature markers: Tawqi3i (UAE government e-signature platform) completion indicators.

Stamp detection

• Corporate seals: round or rectangular stamps bearing company name, registration number, jurisdiction. Common in UAE, KSA, and Lebanon.
• Notary stamps: official stamps from a Notary Public (UAE, Lebanon, Egypt) bearing their registration number and jurisdiction.
• Ministry attestation stamps: UAE Ministry of Foreign Affairs, Saudi MOFA, Lebanese Foreign Ministry — required for documents going through apostille or consular legalization chains.

Validation against required execution

After detection, validate completeness. The required elements depend on the document type and jurisdiction:

Key MENA-specific requirements

Tawqi3i (UAE): The UAE government's official e-signature platform. Documents executed through Tawqi3i are legally equivalent to notarized wet-ink signatures for most civil and commercial purposes. Detect Tawqi3i completion certificates and treat them as equivalent to notarization.

Witness requirements: Many jurisdictions require witnesses for wills, real property deeds, and powers of attorney:

• UAE: wills before a UAE Will Registry require two witnesses.
• Lebanon: most formal acts before a notaire require two witnesses.
• KSA: court documents may require male Muslim witnesses per classical interpretation (varies by court/context).

Initials on every page: In Lebanon and many civil law jurisdictions, multi-page contracts require initials (paraphe) on every page from all parties, not just on the signature page. Flag if initials are absent from interior pages.

Apostille and consular legalization: For cross-border documents, the full execution chain must be present — notarization, then Ministry of Foreign Affairs attestation, then receiving country's consular legalization. Flag incomplete chains.

Output format

The skill returns a structured execution report:

{
  "total_pages": 12,
  "signature_pages": [10, 11],
  "detected_signers": [
    {"role": "Party 1", "name": "ABC LLC", "signature_present": true, "date_present": true, "page": 10},
    {"role": "Party 2", "name": "[blank]", "signature_present": false, "date_present": false, "page": 10}
  ],
  "witness_blocks": [
    {"required": true, "present": true, "page": 11}
  ],
  "notary_block": {"required": true, "present": false, "page": 11},
  "initials_on_all_pages": false,
  "missing_pages_with_initials": [3, 5, 7],
  "stamps_detected": ["Corporate seal — ABC LLC", "Notary stamp — incomplete"],
  "flags": [
    "Party 2 signature missing",
    "Notary block present but stamp absent",
    "Initials missing on pages 3, 5, 7"
  ]
}

Critical handling rules

• Do not paraphrase or reformat signature blocks during OCR. The exact text, layout, and spacing of a signature block are legally significant. Return them as-is.
• Do not redact signature images. Signature images should be preserved even when PII redaction is applied to the surrounding text.
• Flag, do not auto-fill. If a date field is blank, flag it — do not infer a date from surrounding context and fill it in.
• Multi-party complex documents: for documents with more than four signatories (e.g., a shareholders' agreement or a syndicated facility), produce a per-party execution checklist rather than a simple pass/fail.

Related skills

• [[voice-multimodal-scanned-pdf-handler]]
• [[voice-image-of-contract-page-handler]]
• [[voice-signature-page-detector]]
• [[voice-dictation-cleanup]]