SunnyNet Wpf, from Hmlyn, is a Windows network packet analysis and debugging tool aimed at developers and security researchers. It captures and inspects HTTP, HTTPS, WebSocket, TCP, and UDP flows using a Go-based high-throughput engine paired with a native WPF interface, enabling live capture, manual replay, and session comparison. The app includes a Request Constructor, Rules Center, TLS fingerprint reporting, and Model Context Protocol (MCP) support. It suits testers who need focused, programmatic traffic debugging on Windows.

What tasks can you actually use SunnyNet for?

The tool supports live capture, targeted debugging, and automated traffic manipulation, which helps trace API calls and validate protocol implementations for both web and custom services. Users can craft and resend requests, compare multiple sessions to spot regressions, and apply on-the-fly interception rules to rewrite traffic during active testing. These outcomes make it applicable to QA cycles, security audits, and protocol development work.

How reliable and detailed are the captured outputs?

Captured streams come from a Go-based engine designed for high-rate throughput and stability, preserving packet timing and payloads under load and reducing dropped frames during busy captures. TLS fingerprint reporting surfaces handshake characteristics useful for client or server identification. Whether encrypted payloads appear as plaintext depends on installing a local root certificate, a required step to decrypt HTTPS streams for inspection.

What input and setup does it require?

The application runs on Windows and uses a WPF interface that depends on the .NET framework, so runtime is tied to that environment and to local process visibility. Isolating traffic by process requires the target application to be present on the same machine. The Model Context Protocol integration exposes captured data programmatically to external agents, enabling automated analysis without manual file exports.

Is it easy to adopt for developer workflows?

The hybrid architecture pairs a native interface with a high-performance backend to keep interaction responsive during heavy captures. Workflow integration is supported through built-in request replay and interception mechanisms that fit iterative debugging and automated testing. The project’s open-source presence and a noted lightweight footprint on GitHub make it feasible for teams to audit packet handling logic and adapt the tool to existing pipelines.

A practical, Windows-focused choice for teams combining automated analysis with manual verification

SunnyNet is a practical option for Windows developers and security researchers who need programmatic access to captured network data and a community-visible codebase. Its integration with automated analysis tools supports faster triage, but teams should treat generated insights as starting points and verify findings manually. Prefer this tool when operating inside Windows-centric pipelines and when the project’s open-source nature aids auditability and extension.