vinkius-labs/mcp-fusion

v3.1.8 Bugfix

This release fixes issues for SREs watching stability and regressions.

Published 3mo 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

Summary

AI summary

Fixed late‑registered tool observability propagation and async function rejection in SandboxGuard.

Full changelog

Bug Fixes (Medium #12-#16)

Fixed

Bug #12 — ToolRegistry.register() now propagates debug/tracing/telemetry to late-registered builders via _propagateObservability()
Bug #13 — FluentSchemaHelpers.default() auto-marks field as optional so Zod validation passes when LLM omits the field
Bug #14 — PostProcessor regex updated from [SYSTEM_RULES] to <domain_rules> XML format matching ResponseBuilder output
Bug #15 — TelemetryBus uses process.once() + signal re-emit for clean shutdown instead of blocking process.on()
Bug #16 — SandboxGuard rejects async functions with descriptive error (async produces '{}' via JSON.stringify(promise))

Tests

22 new regression tests in 1 test file
3 existing SandboxGuard tests updated (async now correctly rejected)
1 DebugObserver test corrected (late-registered tools now receive events)
All 3385 tests pass with 0 regressions

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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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Related context

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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.