mika76/vb6-mcp

MCP server that lets AI agents work inside the VB6 IDE: live code, debugging, the running app's UI, builds

About vb6-mcp

An MCP server that lets AI agents (Claude Code) work inside the Visual Basic 6 IDE the way a developer does: read and edit live (unsaved) code, run and debug, drive the running app's UI, take screenshots, and build.

- Design and decisions: PLAN.md - Rules for agents working on this repo: AGENTS.md - Architecture: docs/architecture.md - Wire protocol (server ↔ add-in ↔ watchdog): docs/protocol.md - MCP tool reference: docs/tools.md - Experiments that back the design: docs/spikes/ - What changed in each release: CHANGELOG.md

Status: version 1.1.1. All planned phases are built: live code, debugging, UI automation, the watchdog, builds and sync, forms, references and COM, packaging, and the improvements from real use and benchmarks. The spike code under spikes/ is throwaway and is never referenced by src/.

A scripted session on the Cart test fixture: an agent reproduces a wrong total, finds the cause at a breakpoint, fixes one line and checks the result. The screenshots are real; the chat panel and the cursor are drawn (the tools send input to the controls directly). Full quality: the MP4 (81 s). Regenerate both with node scripts/demo/video.js, then dotnet run --project scripts/demo/videomaker -c Release -- build/demo/video build/demo/demo.mp4 docs/media/demo.gif.

The agent works on what the developer sees in the IDE, not just on the files:

- Code: read and edit the code as the IDE holds it, unsaved edits included; symbols and every use of a name across projects; save explicitly. - Run and debug: start, break, step, breakpoints, the current line, locals, call stack, Immedi

From the project README.

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