Vibe Legal Server — Batch Contract Redlining

CRITICAL — Data flow warning. This skill sends the full text of every uploaded contract to Google Gemini for AI-driven redlining. The "bring your own key" model means traffic is keyed to your account, but the document body still leaves your environment and is processed on Google infrastructure. Do not invoke on privileged client material unless your firm has approved sending legal documents to Google Gemini under the relevant DPA / firm AI policy. If your firm has not approved Gemini for client work, configure the server to point at an on-prem model (e.g., a local Llama / Mistral deployment) or an alternative provider covered by your firm's policy (e.g., Azure OpenAI under your tenant's data-processing terms) before running the skill on real matters.

Audience and Work Shape

Audience: UK-qualified commercial lawyers (or supervised paralegals under a qualified lawyer's sign-off) who are comfortable reading tracked changes line-by-line and willing to reject AI-applied edits. Not for non-lawyer end-users, self-service contract-acceptance workflows, or unsupervised paralegal review.

Work shape: Bounded Transactional at batch scale. Each redlined DOCX is a draft proposal, not a recommendation, and the operator must accept or reject every tracked change individually. The work shape note matters because batch volume (up to 5 documents in one run) creates exactly the pressure that produces skim-acceptance — at scale, escalation matters more, not less. If you cannot honestly commit to per-change review for every document in the batch, do not run the batch.

Scope and Legal Use

This skill provides legal support (a first-pass redline against a playbook), not legal advice. Three legal failure modes the operator must own:

1. Advice vs. support. The redlines are positional drafts; the responsible lawyer owns every position taken in the output. A tracked change in the DOCX is not a recommendation by the skill, by LegalQuants, or by the original author.
2. Privilege and confidentiality. Uploading a client contract to Google Gemini (via your BYOK API key) routes the document text through a third-party AI processor and, depending on Gemini configuration and region, may involve cross-border processing. This can impair privilege and breach engagement-letter / client-confidentiality obligations absent client consent and firm AI-policy coverage. Treat every invocation as an outbound disclosure and confirm coverage before upload.
3. Accountability. A named reviewing lawyer must sign off on the final redline. The skill produces no audit trail of which AI operations were accepted or rejected; the reviewing lawyer is responsible for capturing that record outside the tool.

When to Use

• Reviewing multiple contracts against a standardized playbook
• Batch processing contracts for due diligence or portfolio review
• Applying negotiation positions consistently across many documents
• Generating tracked changes programmatically (not just single-doc interactive review)
• Running "bring your own key" AI workflows on sensitive documents

What It Is

Part 2 of the Vibe Legal project — a batch processing server for contract redlining.

• Word Add-in (Part 1) → Interactive negotiation, single contract at a time
• Server (This) → Batch review, pile of contracts marked up against your playbook

How It Works

Architecture

Upload DOCX → Extract structure → Send to AI with playbook → 
AI returns operations (AMEND/INSERT/DELETE) → 
Apply as tracked changes → Download redlined document

Key Design Decisions

• Surgical changes, not rewrites — AI applies targeted operations, not wholesale replacement
• Proper tracked changes — Output is native Word tracked changes (strikethrough/underline), not comments or inline text
• Playbook-driven — Define your negotiation position in Markdown; AI applies it consistently
• Bring your own key — Your Gemini API key stays in browser; documents don't persist on server
• Batch mode — Up to 5 documents at once, processed sequentially

Example Playbooks

# NDA Review (Recipient)
## Priority Issues
1. Term length — push for 2-3 years, not perpetual
2. Carve-outs — ensure public info exclusion
3. Residuals — delete or narrow heavily

## Watch For
- Perpetual confidentiality obligations
- Broad injunctive relief language
- Unilateral fee provisions

Usage

Single Document Review

1. Upload contract (DOCX)
2. Select playbook
3. Process → download redlined document

Batch Mode

1. Upload up to 5 documents
2. Select playbook
3. Process sequentially
4. Download individually or as ZIP

Playbook Creation

Write negotiation positions in Markdown:

# SELLER'S PLAYBOOK
## Priority Issues
1. Payment terms — require payment on delivery
2. Liability cap — maintain full purchase price cap

## Watch For
- Unlimited liability language
- Buyer-friendly termination rights

Confidence Bands (per contract)

Each AI-applied tracked change should be reviewed with its confidence band in mind. The skill should be configured to tag each operation in the output (e.g., via a sidecar summary memo per DOCX) so the lawyer can triage rather than read every change blind:

• High — operation is a direct, literal application of a numbered playbook item to a clause whose wording closely matches the playbook trigger (e.g., playbook says "delete residuals clause"; document contains a clearly identified residuals clause; AMEND/DELETE applied).
• Medium — playbook item applies but the document wording diverges, or the operation requires judgement about scope (e.g., "narrow injunctive relief"). Lawyer must read the surrounding clause, not just the redline.
• Low / Review — operation touches a liability cap, indemnity, IP assignment, data-protection, governing-law, or termination clause; AI rationale is unclear; operation count for this document exceeds the threshold set in the playbook; or the document falls in a known-failure area (tables, footnotes, nested numbering, non-English). Do not present as a proposed change to the counterparty until a named reviewer has signed off on the underlying position.

A redlined DOCX without confidence bands attached is unreviewed output. Treat it as Low across the board.

Out of Scope

This skill does not handle:

• Jurisdictions other than UK (frontmatter declares jurisdiction: UK; non-UK governing law is out of scope and the skill should halt rather than proceed).
• Regulated agreements: consumer credit, employment contracts subject to ACAS / statutory minimums, real estate transfers, financial-services agreements requiring FCA-aligned wording, regulated procurement (PCR 2015 / PA 2023).
• Contracts over ~50 pages, or any contract with embedded exhibits / schedules the AI cannot see (image-only PDFs, separately attached SOWs, etc.).
• Tables, complex nested numbering, columns, text boxes, footnotes — behaviour is unpredictable and the skill should refuse to produce a "clean" output on these documents.
• Non-English documents.
• Documents where the playbook is empty, ambiguous, or contains fewer than the minimum number of priority items the user has agreed with their team. No silent proceed.
• Final QC / proof-of-fitness-to-execute. The output is a draft proposal for a reviewing lawyer, not a sign-off.

Escalation

Stop the batch (or stop the individual document) and route to a named reviewing lawyer when any of the following triggers fire. At batch scale, escalation matters more, not less — the volume of the batch is not an excuse to lower the escalation threshold; it is the reason to raise it.

• AI proposes any operation that removes or weakens a liability cap, indemnity, IP-assignment, data-protection, or governing-law clause.
• AI proposes more operations on a single document than the playbook-declared per-document cap.
• Contract value (if metadata available) exceeds the threshold set in the team practice profile.
• Document contains structures the skill cannot handle reliably (tables, footnotes, nested numbering, non-English text).
• Playbook mismatch with the document's apparent type or jurisdiction (e.g., a recipient-NDA playbook applied to a discloser-side draft; an English-law playbook applied to a Scots- or NY-law contract).
• Privilege gate not cleared — i.e., the firm has not approved Gemini (or the configured alternative) for the matter or client.
• Operator cannot honestly commit to per-change review of every document in the batch.

In any of these cases the skill should produce an escalation memo, not just a redlined file, identifying the trigger and the document(s) affected.

Known Limitations

• Tables — behavior unpredictable
• Complex nested numbering schemes
• Heavy formatting (columns, text boxes, footnotes)
• Non-English documents
• No deterministic validation — AI output not verified before applying
• No rollback — malformed AI response can corrupt document structure

Critical: Always review every change. Work on copies. This is research software, not production-ready.

Tech Stack

• FastAPI (Python backend)
• python-docx + lxml (Word manipulation)
• React + Vite (Frontend)
• Google Gemini (AI)
• Tailwind CSS (Styling)

Setup

git clone https://github.com/sarturko-maker/vibe-legal-server
cd VibeLegalPython

# Backend
python -m venv venv
source venv/bin/activate
pip install -r requirements.txt
python main.py

# Frontend (new terminal)
cd vibelegal-frontend
npm install
npm run dev

Limitations

• AI makes mistakes — may remove liability caps while "fixing typos", miss obvious issues, hallucinate clauses
• Always review every change before relying on output
• For high-risk or high-value contracts, escalate to qualified counsel
• Tables and complex formatting not fully supported

QA Remediation (LegalQuants, 2026-05)

Original author: Artur Serov. Remediation by LegalQuants under the Legal Skill Design Framework, 2026-05. No technical content changed.

This pass added the following to the skill body:

• Gemini data-flow warning at the top. The previous version mentioned BYOK in the "How It Works" section but did not flag, in prominent and structural terms, that full contract text leaves the user's environment and is processed by Google Gemini. A bolded data-flow warning now sits above the substantive content, with an explicit firm-approval gate ("Do not invoke on privileged client material unless your firm has approved sending legal documents to Google Gemini under the relevant DPA / firm AI policy") and an explicit option to point the server at an on-prem model or an alternative provider covered by the firm's AI policy. This is the single highest-impact remediation: at batch scale the privilege exposure is the privileged exposure of every document in the batch, not just one.
• Privilege named as one of three legal failure modes. The Scope and Legal Use section now states, structurally, that uploading client documents to Gemini via BYOK can impair privilege absent client consent and engagement-letter coverage. Advice-vs-support and accountability are named alongside it.
• Audience and Work Shape made explicit. UK-qualified lawyers (or supervised paralegals); Bounded Transactional at batch scale; per-change review required; at scale, escalation matters more, not less.
• Confidence Bands added per contract. High / Medium / Low with explicit Low triggers (liability caps, indemnities, IP, DP, governing law, known-failure structures). A redline without bands is to be treated as unreviewed.
• Out of Scope hard-stop list. Non-UK governing law, regulated agreements, >50pp, tables/footnotes/nested numbering, non-English, empty/ambiguous playbook, final QC. No silent proceed.
• Escalation section added. Concrete triggers (liability/indemnity/IP/DP/governing-law operations, per-document operation caps, contract value, structural mismatches, privilege gate not cleared) that should produce an escalation memo, not just a redlined file.

Out of scope for this remediation pass: vendoring the external vibe-legal-server repo into the skill directory, adding a LICENSE, adding eval data, or pinning a commit hash for the external repo. Those remain open items for the original author and are noted in the QA report.