Filter schemas

Filters receive MCP messages and return an enforcement decision. Choose the contract that matches the implementation you are deploying.

Format	Reference
MCP filter tool request/response	Filter tool contract
HTTP webhook payload and signature	HTTP filters

An MCP filter tool returns the decision fields described in its contract. An HTTP webhook uses HTTP status codes and can verify the configured request signature. Do not interchange these response formats.

For deployment and traffic selectors, see Filter MCP traffic.