Connect
One line, then ask your agent to check its work.
NIUA is a hosted MCP server and a REST API. Add it once and your agent can check any artifact against a contract and read back what failed.
Checking your own file needs a client that can make HTTP requests, as Claude Code, Cursor and Codex can: the upload is an HTTP PUT of the file, not an MCP call. A chat app without one can still check NIUA's sample files.
Connect your coding agent to NIUA so it can check its own work and fix what fails. For developers who run Claude Code, Cursor, Codex or any MCP client.
01 Add NIUA to Claude Code
claude mcp add --transport http niua https://mcp.ohao.tech/mcp02 Ask it to check a file
claude -p "Upload lamp.glb and check it against glb.prop@1 with NIUA. Fix what fails."03 Anyone re-checks the receipt it gets ("valid": true)
curl https://api.ohao.tech/api/v1/receipts/$RECEIPT_ID
- MCP
- the protocol agents such as Claude Code use to call tools. NIUA is an MCP server.
- Gate
- NIUA's checker. It runs a contract on your file and says pass or fail, with a fix for each fail.
- Contract
- the published rules a file must meet, by name and version. Each rule has a threshold and a fix.
- Receipt
- a signed note that this exact file passed this exact contract. Anyone can verify it, offline.
claude mcp add --transport http niua https://mcp.ohao.tech/mcpThe first connect opens a NIUA sign-in in your browser. To skip it, send an API key as a Bearer token.
Then say
List the NIUA contracts, then check ./chair.glb against glb.prop and fix whatever fails until it passes.