# Schematic Connectivity Review

> Find common schematic connection issues Review an Ohmforge schematic for isolated pins, dangling wires, missing ground references, duplicate designators, and net-label conflicts.

Part of usefulweb.site (https://usefulweb.site/). Results are deterministic calculations from the inputs and the listed assumptions; the API returns exactly what the web page shows.

## Use it
- Human interface: https://ohmforgeconnectivityreview.usefulweb.site/ (interactive tool at https://ohmforgeconnectivityreview.usefulweb.site/tool)
- JSON API: POST https://ohmforgeconnectivityreview.usefulweb.site/api/v1/calculate with a JSON object of inputs (schema: https://ohmforgeconnectivityreview.usefulweb.site/api/v1/tool)
- OpenAPI: https://ohmforgeconnectivityreview.usefulweb.site/openapi.json
- MCP (Streamable HTTP): https://ohmforgeconnectivityreview.usefulweb.site/mcp - tool `ohmforge_connectivity_review`

## Inputs
- project (textarea): Ohmforge project JSON - Paste an exported .ohmforge.json project. This tool does not accept KiCad files.

## Method
- Validates a bounded native Ohmforge project and evaluates the same connectivity model used in the schematic workspace.
- Reports isolated component pins, free wire endpoints, a missing ground reference, duplicate reference designators ignoring case, and merged net-label warnings.
- Pins on wire segments, common vertices and wire endpoints on other segments connect; crossing segment interiors alone do not. Ground and matching net labels are global connections.
- A wire on a pin suppresses the isolated-pin warning even if its other end is free; inspect dangling-wire findings as well.

## Limits
- This is a connectivity review, not a complete electrical rules check, physical safety assessment, or PCB design-rule check. A quiet report does not establish that a circuit is correct or safe.