# STI-CR

STI-CR is a public STIR/SHAKEN certificate repository and validation site.

Primary pages:
- Landing page: https://sti-cr.com/
- API documentation: https://sti-cr.com/api/docs
- MCP endpoint: https://sti-cr.com/api/mcp
- MCP discovery: https://sti-cr.com/.well-known/mcp.json

Agent guidance:
- Use the MCP endpoint for JSON-RPC Streamable HTTP requests.
- Call `tools/list` to discover available tools.
- Use `create_sti_cr_short_url` for certificate x5u hosting.
- Use `validate_identity_header` for SIP Identity header verification.
- Use `inspect_certificate` and `validate_certificate` for X.509 certificate checks.
- Use `lookup_ocn` to resolve carrier identity by OCN or company.