Mcreplay

Mcreplay is an open source developer tool that turns McDonald's China MCP queries into local structural tests and change reports.

McReplay turns McDonald's MCP queries into reproducible local structure tests for developers maintaining parsers and demo apps. It removes real response values while keeping the structure intact, compares changes, and replays samples via standard MCP protocols. The tool detects breaking changes, missing fields, and type modifications, outputting distinct exit codes and independent HTML reports. It supports Python 3.11+ environments and works with specific read-only tools like now-time-info, campaign-calendar, and list-nutrition-foods. Developers can use offline commands for CI pipelines, test MCP clients with local samples, and save structure observations using included skills.

Mcreplay at a glance

Best for: Software engineer
Runs on: macOS, Linux, API, CLI, open source
Pricing: Free
Released: October 2026
Category: AI coding tool
Website: github.com/yoyolin008/mcreplay

Key features

Identify complete JSON and code fencing responses
Detect tool deletions, added parameters, and type changes
Run local MCP replay using official Python MCP SDK and stdio
Receive official query results and write structural files locally
Generate independent HTML reports with clear exit codes
Support offline CLI commands for continuous integration

Use it for

Compare sample structures before modifying parsers
Test MCP clients using local structural samples
Save structure observations from AI client queries

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