PUBLISHED ON:
December 09 2025

The Strangler-Fig Approach to Introducing Agentic AI in Insurance Platforms

A Controlled, Evolutionary Model for Modernizing Core Systems Without Disruption

Agentic Modernization Insurance

Executive summary

Insurance core systems are under increasing pressure.

  • Legacy monolithic platforms
  • Rigid underwriting and rating engines
  • Batch-based claims processing
  • Hard-coded business rules
  • Region-specific database dependencies
  • Increasing regulatory scrutiny

Most insurers recognize the need for modernization.

However, full core replacement programs are:

  • Multi-year undertakings
  • Capital intensive
  • Operationally risky
  • Often disruptive to underwriting and claims operations

The strategic question is no longer:

“How do we replace the core?”

It is:

“How do we evolve the core safely while introducing intelligent automation?”

This white paper outlines how the Strangler-Fig architectural pattern can be applied to introduce Agentic AI into legacy insurance platforms — without a high-risk, big-bang transformation.

The Modernization Dilemma in Insurance

Traditional core insurance systems were built to:

  • Process policies
  • Calculate premiums
  • Manage claims
  • Maintain regulatory records

They were not built to:

  • Support real-time AI-driven decisioning
  • Handle unstructured documentation
  • Enable conversational interfaces
  • Orchestrate autonomous workflows
  • Integrate seamlessly across regions

As a result, insurers face two flawed options:

  1. Full core replacement (high disruption)
  2. Superficial AI overlays that lack governance

Neither option provides a sustainable path forward.

The Strangler-Fig Pattern Explained

The Strangler-Fig pattern is a modernization strategy in which:

  • New capabilities are built around the legacy system.
  • Functionality is gradually migrated to modern services.
  • The legacy core is incrementally reduced over time.

Rather than replacing the monolith in one event, modernization becomes evolutionary.

When applied to Agentic AI, this pattern allows insurers to introduce intelligent automation safely — without destabilizing existing underwriting and claims engines.

Applying the Strangler-Fig Pattern to Agentic AI

Introducing Agentic AI into insurance platforms requires architectural discipline.

The recommended approach involves five progressive layers:

Step 1: Wrap the Core With a Semantic Layer

Before introducing AI agents, insurers must:

  • Standardize definitions (loss ratio, margin, risk score, TTM, etc.)
  • Create an unambiguous data dictionary
  • Document calculation logic and refresh cadence
  • Define ownership and regulatory applicability

This semantic layer becomes the grounding context for AI.

Without it, agents will amplify ambiguity.

Step 2: Introduce Transformation-Driven Gold Data Layers

Legacy insurance systems often store operational data in:

  • Transactional schemas
  • Region-specific databases
  • Batch-driven reporting tables
  • AI agents require decision-grade data.

Using a medallion architecture (Bronze → Silver → Gold):

  • Raw operational data is transformed
  • Business logic is encoded explicitly
  • Cross-region inconsistencies are resolved
  • Data becomes AI-ready and governed

This step is foundational.

Agents must operate on transformed, validated data — not raw transactional tables.

Step 3: Extract Business Logic Into Middleware Services

In most legacy insurance platforms, business rules are:

  • Hard-coded in stored procedures
  • Embedded in underwriting engines
  • Spread across rating modules

These rules must be abstracted into:

  • Middleware services
  • API-driven logic layers
  • Version-controlled calculation modules

This enables:

  • Transparency
  • Auditability
  • Gradual migration away from monolithic logic

Over time, decision intelligence shifts from the database to modular services.

Step 4: Deploy Domain-Constrained AI Agents Outside the Core

Instead of embedding AI directly inside the core platform, deploy specialized agents around it.

Examples:

Claims Agent

  • Validates documentation
  • Detects anomalies
  • Flags potential fraud
  • Reconciles claim amounts against policy rules

Pricing Agent

  • Evaluates risk thresholds
  • Tests rate sensitivity
  • Simulates underwriting scenarios

Compliance Agent

  • Monitors regulatory triggers
  • Tracks documentation completeness
  • Generates audit alerts

These agents:

  • Operate on governed gold-layer data
  • Follow domain-specific SOPs (system prompts)
  • Log all decisions
  • Respect role-based access controls

They augment the core — without destabilizing it.

Step 5: Gradually Shift Decision Intelligence Away From the Monolith

Over time:

  • Business logic moves into middleware services
  • Decision-making moves into orchestrated AI layers
  • Core database dependencies reduce
  • Regional deployments become more flexible

The platform becomes:

  • Database-agnostic
  • API-first
  • AI-ready
  • Modular and scalable

This is modernization without disruption.

Governance, Risk & Controlled Autonomy

Agentic AI in insurance must operate within strict governance frameworks.

Key principles include:

Domain Confinement

Agents must operate only within their defined business domain.

Orchestration Layer

An AI orchestration layer routes tasks, enforces validation gates, and logs actions.

Phased Autonomy

Deployment should follow a staged approach:

  1. Insight Mode (recommendations only)
  2. Assisted Mode (human approval required)
  3. Controlled Autonomy (threshold-based automation)

Auditability

Every decision must be:

  • Traceable
  • Logged
  • Explainable
  • Reproducible

In regulated industries like insurance, autonomy without governance is unacceptable.

Strategic Benefits for Insurers

Applying the Strangler-Fig approach to Agentic AI enables:

Reduced Modernization Risk

No big-bang system replacement.

Faster Time to Value

Agents deliver operational improvements early.

Improved Compliance

Continuous monitoring and structured audit trails.

Operational Efficiency

Automation of low-value, repetitive workflows.

Long-Term Platform Flexibility

Gradual evolution into modular, AI-ready architecture.

Why This Matters Now

The insurance industry is facing:

  • Increasing regulatory scrutiny
  • Rising operational costs
  • Customer expectations for faster processing
  • Competitive pressure from digital-native insurers

Full core replacements are often unrealistic.

But incremental intelligence adoption is achievable.

Agentic AI does not require destruction of legacy systems.

It requires architectural strategy.

Conclusion

The future of insurance modernization is not radical replacement. It is structured evolution.

The Strangler-Fig approach provides a disciplined path to:

  • Introduce Agentic AI safely
  • Reduce operational risk
  • Improve governance
  • Modernize incrementally

Modernization does not require disruption.

It requires:

Governance first.
Semantics first.
Controlled autonomy.

In insurance, intelligence must scale — but it must scale safely.