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    PolySync MCP — Cross-Language AST Type Synchronizer

    1

    Multi-Repo Cross-Language AST Type Synchronizer & Boundary Enforcer. Keeps Python/Go backend models synchronized with TypeScript/React frontend types.

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    PolySync MCP — Cross-Language AST Type Synchronizer

    PolySync MCP — Cross-Language AST Type Synchronizer

    Example session with this skill installed

    Synchronize our Python Pydantic backend models in /backend/models/order.py with our React TypeScript interfaces in /frontend/types/order.ts using PolySync. Detect any field or nullability drift.

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    • Compiled the polysync mcp

    I have audited your cross-language models using PolySync MCP. Cross-boundary desynchronization was detected between the Python Pydantic backend and TypeScript frontend, and a synchronized interface was synthesized.

    PolySync Cross-Language Boundary Report

    <schema_ir source="python:OrderPayload" target="typescript:OrderPayload">
  <discrepancies count="2" status="RESOLVED">
    <item type="MISSING_FIELD_IN_TARGET" field="is_settled" severity="BLOCKING">

      Backend model includes `is_settled: bool`, but TypeScript frontend omitted it.

        </item>
    <item type="TYPE_MISMATCH" field="total_amount" severity="CRITICAL">

      Backend defines `float/number`, but frontend interface expected `string`.

        </item>
  </discrepancies>
</schema_ir>

    Model Parity Matrix

    Property NameBackend (Python Pydantic)Frontend (TypeScript)Drift VerdictAction Taken
    order_idstrstringPARITYPreserved
    customer_idstrstringPARITYPreserved
    total_amountfloat (number)stringMISMATCHCorrected to number
    is_settledboolmissingMISSINGInjected boolean
    notesOptional[str]string?PARITYMaintained optional
    // Synchronized Canonical Interface: frontend/types/order.ts
export interface OrderPayload {
  order_id: string;
  customer_id: string;
  total_amount: number;
  is_settled: boolean;
  notes?: string;
}

    Next Steps

    1. Fullstack type parity achieved: 0 missing properties, 0 type mismatches.
    2. Pre-commit hook armed to prevent future unilateral backend model changes.

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    About this skill

    PolySync enforces type integrity across polyglot architectures (e.g. Python FastAPI / Go backend + TypeScript/React frontend), ensuring that data model changes in one repository never desynchronize from companion client repositories.

    Agents working across fullstack or multi-repo projects frequently cause silent contract breaks:

    1. Unilateral Field Changes: The agent alters a field name in a Python Pydantic model (user_id: str -> accountId: str) to fix a backend issue, but leaves the React TypeScript interface untouched.

    2. Nullability Mismatches: A backend field becomes optional (Optional[str]), but frontend components continue treating it as required, causing production runtime crashes.

    3. Context Silos: Single-repo agent sessions lack awareness of external consuming repositories.

    4. Language-Agnostic Schema IR:

      • Parses TypeScript interfaces, Python Pydantic models, and Go structs into a canonical schema representation.

    5. Cross-Language Differential Engine:

      • Detects omitted fields, type incompatibilities, and nullability conflicts between client and server schemas.

    6. Automated Target Transpilation:

      • Synthesizes clean, idiomatic target language types directly from the canonical backend models.

    7. Pre-Commit Boundary Hook:

      • Halts commits if boundary entity modifications are detected without synchronized client interface updates.
    • extract_entity_schema: Extracts canonical schema IR from TypeScript, Python, or Go source code.
    • compare_cross_language_types: Identifies divergence between source models and target type definitions.
    • generate_synchronized_target: Transpiles source models into synchronized target language files.

    How to use

    1. 1

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    Requires

    TypeScript
    Python / Go

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