qwed-legal 0.1.0

🏛️ Verification guards for legal contracts - Date calculations, clause consistency, liability verification

🏛️ QWED-Legal

Verification Guards for Legal Contracts

Catch AI hallucinations before they become lawsuits.

Don't trust AI with legal analysis. Verify it.
Deadline math • Clause contradictions • Liability calculations

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🚨 The Problem

Lawyers are using AI to review contracts. AI makes mistakes.

Case	What Happened	Impact
Mata v. Avianca (2023)	ChatGPT cited 6 fake legal cases	$5,000 fine, sanctions
Contract Review Errors	LLMs miss contradictory clauses	Disputes, litigation
Date Calculation Bugs	"30 business days" miscalculated	Missed deadlines, defaults

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⚡ Quick Start

Installation

pip install qwed-legal

Verify a Deadline Calculation

from qwed_legal import DeadlineGuard

guard = DeadlineGuard()
result = guard.verify(
    signing_date="2026-01-15",
    term="30 business days",
    claimed_deadline="2026-02-14"  # LLM claimed this
)

print(result.verified)   # False!
print(result.computed_deadline)  # 2026-02-27 (correct)
print(result.message)
# ❌ ERROR: Deadline mismatch. Expected 2026-02-27, but LLM claimed 2026-02-14.

Verify a Liability Cap

from qwed_legal import LiabilityGuard

guard = LiabilityGuard()
result = guard.verify_cap(
    contract_value=5_000_000,
    cap_percentage=200,
    claimed_cap=15_000_000  # LLM said 15M
)

print(result.verified)  # False!
print(result.computed_cap)  # 10,000,000 (200% of 5M)
# ❌ ERROR: 200% of $5M = $10M, not $15M

Detect Contradictory Clauses

from qwed_legal import ClauseGuard

guard = ClauseGuard()
result = guard.check_consistency([
    "Seller may terminate with 30 days notice",
    "Neither party may terminate before 90 days",
    "Seller may terminate immediately upon breach"
])

print(result.consistent)  # False!
# ⚠️ WARNING: Clauses 1 and 2 may conflict (days 30-90)

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🛡️ The Four Guards

Guard	What It Verifies
DeadlineGuard	Date calculations, business days, leap years
LiabilityGuard	Cap percentages, tiered liability, indemnity limits
ClauseGuard	Clause contradictions, termination conflicts
CitationGuard	Legal citations (Bluebook format, case names, reporters)

Verify Legal Citations (New!)

from qwed_legal import CitationGuard

guard = CitationGuard()
result = guard.verify("Brown v. Board of Education, 347 U.S. 483 (1954)")

print(result.valid)  # True
print(result.parsed_components)
# {'plaintiff': 'Brown', 'defendant': 'Board of Education', 'volume': 347, 'reporter': 'U.S.', 'page': 483, 'year': 1954}

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📊 Audit Log: Real Hallucinations Caught

Contract Input	LLM Claim	QWED Verdict
"Net 30 Business Days from Dec 20"	Jan 19	🛑 BLOCKED (Actual: Feb 2, 2026)
"Liability Cap: 2x Fees ($50k)"	$200,000	🛑 BLOCKED (Actual: $100,000)
"Seller may terminate with 30 days notice" + "Neither party may terminate before 90 days"	"Clauses are consistent"	🛑 BLOCKED (Conflict detected)
"Smith v. Jones, 999 FAKE 123"	Valid citation	🛑 BLOCKED (Unknown reporter)

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🏦 All-in-One Guard

from qwed_legal import LegalGuard

guard = LegalGuard()

# All verification methods in one object
guard.verify_deadline(...)
guard.verify_liability_cap(...)
guard.check_clause_consistency(...)

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🌍 Jurisdiction Support

DeadlineGuard supports jurisdiction-specific holidays:

from qwed_legal import DeadlineGuard

# US holidays (default)
us_guard = DeadlineGuard(country="US")

# UK holidays
uk_guard = DeadlineGuard(country="GB")

# California-specific holidays
ca_guard = DeadlineGuard(country="US", state="CA")

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🔗 Related QWED Packages

Package	Purpose
qwed-verification	Core verification engine
qwed-finance	Banking & financial verification
qwed-ucp	E-commerce transaction verification
qwed-mcp	Claude Desktop integration

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📄 License

Apache 2.0 - See LICENSE

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⭐ Star us if you believe AI needs verification in legal domains

"In law, precision isn't optional. QWED makes it verifiable."