modality-mcp-kit
MCP ServerFreeModality MCP Kit - Schema conversion utilities for MCP tool development with multi-library support
Capabilities8 decomposed
zod-to-json-schema conversion with mcp tool parameter mapping
Medium confidenceConverts Zod schema definitions into JSON Schema format compatible with MCP tool parameter specifications. Uses Zod's introspection API to traverse schema AST and generate valid JSON Schema with proper type inference, validation constraints, and nested object support. Enables developers to define tool parameters once in TypeScript and automatically generate MCP-compliant schemas without manual JSON Schema authoring.
Provides bidirectional Zod↔JSON Schema conversion optimized for MCP's specific tool parameter requirements, leveraging Zod's native introspection rather than regex or AST parsing
More maintainable than manual JSON Schema authoring and more type-safe than string-based schema templates because it validates at TypeScript compile-time
xs schema to json schema transpilation for legacy tool definitions
Medium confidenceTranspiles XML Schema (XSD) definitions into JSON Schema format suitable for MCP tool parameters. Parses XSD element declarations, type definitions, and constraints (minOccurs, maxOccurs, pattern restrictions) and maps them to equivalent JSON Schema constructs. Enables teams with existing XSD-based tool specifications to integrate with MCP without rewriting schemas.
Handles XSD-specific constructs like xs:restriction, xs:extension, and cardinality constraints with explicit mapping rules to JSON Schema, rather than treating XSD as generic XML
Preserves more semantic information from XSD than generic XML-to-JSON converters because it understands XSD type system semantics
multi-library schema validation bridge with unified interface
Medium confidenceProvides a unified validation interface that abstracts over multiple schema libraries (Zod, Yup, io-ts, Ajv) and converts their validation results into a standardized MCP-compatible format. Routes validation calls to the appropriate library backend based on schema type, normalizes error messages, and produces consistent validation reports. Enables MCP tool developers to use their preferred validation library without rewriting tool parameter handling logic.
Implements a strategy pattern for validation library routing with automatic error normalization, rather than requiring developers to manually call different validation APIs
Reduces coupling to specific validation libraries compared to direct library usage, enabling easier library swaps and team standardization
json schema generation from typescript interfaces with mcp tool metadata
Medium confidenceExtracts TypeScript interface definitions and generates JSON Schema with embedded MCP tool metadata (descriptions, examples, required fields). Uses TypeScript compiler API to analyze interface structure, JSDoc comments, and type annotations, then produces JSON Schema with MCP-specific extensions for tool parameter documentation. Supports nested interfaces, union types, and optional fields with proper cardinality mapping.
Leverages TypeScript compiler API for precise type analysis rather than regex or AST parsing, enabling accurate handling of complex types and JSDoc metadata
More accurate than string-based code generation because it understands TypeScript's type system semantics and can validate schema correctness at generation time
schema validation with constraint enforcement for mcp tool parameters
Medium confidenceValidates incoming tool parameters against generated schemas and enforces constraints (min/max values, string patterns, enum restrictions, required fields). Applies validation rules in order of specificity and produces detailed error reports indicating which constraints failed and why. Integrates with the unified validation bridge to support multiple validation libraries while maintaining consistent constraint enforcement across all MCP tools.
Provides constraint-aware validation that understands MCP-specific requirements (required fields, parameter cardinality) rather than generic JSON Schema validation
More informative error messages than raw JSON Schema validators because it maps validation failures back to MCP tool parameter semantics
schema composition and inheritance for reusable mcp tool parameter definitions
Medium confidenceEnables schema reuse through composition patterns (allOf, oneOf, anyOf) and inheritance hierarchies, allowing developers to define base parameter schemas and extend them for specific tools. Resolves $ref references, flattens composed schemas, and generates final MCP-compatible schemas. Supports parameter overrides and constraint refinement in child schemas while maintaining type safety and validation consistency.
Implements composition resolution with MCP-specific semantics (e.g., merging tool parameter metadata) rather than generic JSON Schema composition
Reduces schema duplication more effectively than copy-paste approaches because it maintains single source-of-truth for shared parameter patterns
runtime schema validation with detailed error reporting for mcp protocol compliance
Medium confidenceValidates that generated schemas conform to MCP protocol requirements (valid JSON Schema draft-7, proper tool parameter structure, required metadata fields). Performs static analysis on schemas to detect common issues (missing descriptions, invalid type combinations, unsupported constraints) and produces actionable error messages. Integrates with build pipelines to catch schema compliance issues before tools are deployed.
Validates against MCP-specific protocol requirements rather than generic JSON Schema validity, catching MCP-incompatible schemas that would pass standard validators
Prevents MCP protocol violations earlier in development cycle than runtime error detection because it performs static analysis at schema generation time
bidirectional schema synchronization between typescript types and json schema definitions
Medium confidenceMaintains consistency between TypeScript interface definitions and generated JSON Schema by detecting changes in either direction and propagating updates. Tracks schema versions, detects breaking changes (removed fields, type changes), and generates migration guides. Supports schema versioning and deprecation markers to help MCP clients adapt to schema evolution.
Implements bidirectional sync with breaking change detection, rather than one-way code generation, enabling developers to evolve schemas safely
Catches schema drift earlier than manual reviews because it continuously monitors TypeScript↔JSON Schema consistency
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
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Best For
- ✓TypeScript developers building MCP tools with Zod validation
- ✓Teams standardizing on Zod for runtime validation across MCP agents
- ✓Enterprise teams with existing XSD tool specifications
- ✓Organizations migrating from SOAP/XML-based services to MCP agents
- ✓Large teams with mixed validation library preferences
- ✓Monorepos with multiple MCP tool implementations using different stacks
- ✓TypeScript-first MCP tool developers
- ✓Teams using TypeScript interfaces as source-of-truth for API contracts
Known Limitations
- ⚠Zod-specific — no native support for other TypeScript schema libraries (io-ts, Yup, Ajv)
- ⚠Complex Zod transformations may not map cleanly to JSON Schema equivalents
- ⚠Requires Zod 3.x+ for full introspection API support
- ⚠XSD features without JSON Schema equivalents (e.g., xs:any, xs:choice with complex constraints) may require manual post-processing
- ⚠Namespace handling in XSD may not translate directly to JSON Schema $ref structure
- ⚠Performance degrades on very large XSD files (>10MB) due to DOM parsing
Requirements
Input / Output
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Modality MCP Kit - Schema conversion utilities for MCP tool development with multi-library support
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