@mcp-contracts/cli
MCP ServerFreeCLI tool for capturing and diffing MCP tool schemas
Capabilities5 decomposed
mcp tool schema capture and serialization
Medium confidenceCaptures the complete schema definitions of MCP (Model Context Protocol) tools by introspecting tool registries and serializing them into a canonical JSON format. This enables version control and diffing of tool contracts by converting runtime tool definitions into persistent, comparable schema artifacts that preserve type information, parameter constraints, and documentation.
Implements MCP-specific schema introspection that understands the Model Context Protocol's tool definition structure, capturing not just function signatures but the full MCP schema semantics including resource hints and sampling directives
Purpose-built for MCP tool contracts rather than generic OpenAPI/JSON Schema tools, enabling capture of MCP-specific metadata that generic schema tools would lose
schema diff and change detection
Medium confidenceCompares two captured MCP tool schema snapshots and produces a structured diff report identifying additions, removals, modifications, and breaking changes at the parameter, type, and constraint levels. Uses a line-aware diffing algorithm that maps schema changes to human-readable change descriptions, enabling developers to understand exactly what contract changes occurred between versions.
Implements MCP-aware diff logic that understands tool schema semantics beyond string comparison, classifying changes as breaking/non-breaking based on MCP contract rules and parameter compatibility
More intelligent than generic JSON diff tools because it understands MCP schema semantics and can classify changes as breaking or safe based on tool contract compatibility rules
cli-based schema workflow automation
Medium confidenceProvides command-line interface for integrating schema capture and diff operations into development workflows, shell scripts, and CI/CD pipelines. Supports piping, file I/O, and exit code signaling for integration with standard Unix tooling and automation frameworks, enabling schema validation as a build step or pre-deployment check.
Designed as a Unix-philosophy CLI tool with proper exit codes and piping support, enabling seamless integration into shell scripts and CI/CD systems without requiring Node.js knowledge
More accessible than programmatic APIs for shell-based workflows and CI/CD systems, with standard exit code conventions and text output suitable for log parsing
schema snapshot persistence and versioning
Medium confidenceManages persistent storage of MCP tool schema snapshots as versioned artifacts, enabling historical tracking and comparison across multiple schema states. Stores snapshots in a format suitable for version control (git-friendly JSON), allowing teams to maintain a complete audit trail of tool contract evolution and revert to previous schema states if needed.
Generates git-friendly JSON snapshots that minimize diff noise through consistent formatting and key ordering, making schema changes visible in git diffs without spurious whitespace changes
Better suited for git-based workflows than binary schema formats because JSON diffs are human-readable and can be reviewed in pull requests
tool contract validation against mcp specification
Medium confidenceValidates captured MCP tool schemas against the Model Context Protocol specification, ensuring that tool definitions conform to MCP requirements for parameter types, naming conventions, and schema structure. Performs structural validation that catches schema errors before they propagate to clients, providing detailed error messages that guide developers toward compliant schemas.
Implements MCP specification validation that understands the protocol's specific requirements for tool schemas, including resource hints, sampling directives, and parameter constraints that generic JSON Schema validators would miss
More comprehensive than generic JSON Schema validation because it enforces MCP-specific rules and conventions that ensure interoperability with MCP clients
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
Related Artifactssharing capabilities
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Snapshot, diff, and classify MCP tool schema changes
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SchemaFlow
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mcps-playground
** a playground for Remote MCP servers
MCP Marketplace Web Plugin
** MCP Marketplace is a small Web UX plugin to integrate with AI applications, Support various MCP Server API Endpoint (e.g pulsemcp.com/deepnlp.org and more). Allowing user to browse, paginate and select various MCP servers by different categories. [Pypi](https://pypi.org/project/mcp-marketplace) |
Best For
- ✓MCP server maintainers building versioned tool APIs
- ✓teams implementing contract-driven development for AI agents
- ✓developers integrating MCP into CI/CD pipelines for schema validation
- ✓MCP server maintainers performing schema versioning
- ✓API teams implementing semantic versioning for tool contracts
- ✓CI/CD pipelines requiring automated breaking change detection
- ✓DevOps engineers integrating schema validation into CI/CD
- ✓developers using shell scripts for local development workflows
Known Limitations
- ⚠Requires live MCP server instance or accessible tool registry to capture schemas
- ⚠Does not capture runtime behavior or side effects, only static schema definitions
- ⚠Limited to tools that expose MCP-compliant schema interfaces
- ⚠Diff output is schema-level only; does not detect behavioral changes or implementation differences
- ⚠Breaking change detection is heuristic-based and may miss edge cases in complex schema transformations
- ⚠No built-in support for custom diff rules or domain-specific change semantics
Requirements
Input / Output
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CLI tool for capturing and diffing MCP tool schemas
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