vinkius-labs/mcp-fusion

v3.14.5 Bugfix

This release fixes issues for SREs watching stability and regressions.

Published 2mo MCP Developer Tools

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✓ No known CVEs patched

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✓ No known CVEs patched in this version

Topics

mcp mcp-framework mcp-server model-context-protocol

Affected surfaces

breaking_upgrade

Summary

AI summary

__vinkius_edge_dispatch now returns a JSON string, preventing crashes from non-clonable return values.

Full changelog

Fixed

`@vurb/core` — Edge Dispatch: Structured Clone Boundary Protection

__vinkius_edge_dispatch now returns JSON string instead of raw object — The edge dispatch function (startServer edge mode) previously returned the raw routeCall() result object directly across the V8 isolate structured-clone boundary. If any handler returned an object containing non-clonable values (Promise, Function, Symbol), the isolated-vm structured clone failed with #<Promise> could not be cloned, crashing the runtime. Fixed by wrapping the return value in JSON.stringify() inside the isolate before crossing the boundary. The host (IsolateRunner) calls JSON.parse() on the other side. JSON.stringify neutralizes all non-serializable values automatically (Promises become {}, Functions are stripped), eliminating the entire class of DataCloneError at the isolate boundary.

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About vinkius-labs/mcp-fusion

A TypeScript framework for building production-ready MCP servers with automatic tool discovery, multi-transport support (stdio/SSE/HTTP), built-in validation, and zero-config setup.

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Earlier breaking changes

v4.0.0 All packages now published under the `@mcpfusion` npm scope.
v4.0.0 GitHub repository renamed to vinkius-labs/mcpfusion; npm packages under @mcpfusion scope.
v4.0.0 All source code, documentation, CLI output, workflows, and npm packages now use the @mcpfusion scope.