Create Tunnel Certificate

$ ant beta:tunnels:certificates create

POST/v1/tunnels/{tunnel_id}/certificates

The Tunnels API is in research preview. It requires the anthropic-beta: mcp-tunnels-2026-06-22 header and may change without a deprecation period. It supersedes the Admin API endpoints at /v1/organizations/tunnels, which remain available during a migration window.

Registers a public CA certificate on a tunnel. Anthropic verifies the gateway's server certificate against this CA when it terminates the inner TLS session. A tunnel holds at most two non-archived certificates.

Parameters

--tunnel-id: string

Path param: Path parameter tunnel_id

--ca-certificate-pem: string

Body param: PEM-encoded X.509 CA certificate. Must contain exactly one certificate and no private-key material. Maximum 8KB.

maxLength8192

--beta: optional array of AnthropicBeta

Header param: Optional header to specify the beta version(s) you want to use.

Returns

beta_tunnel_certificate: object{ id, archived_at, created_at, 4 more }

A CA certificate attached to a tunnel.

id: string

Unique identifier for the certificate, prefixed with tcrt_.

archived_at: string

A timestamp in RFC 3339 format

formatdate-time

created_at: string

A timestamp in RFC 3339 format

formatdate-time

expires_at: string

A timestamp in RFC 3339 format

formatdate-time

fingerprint: string

Lowercase hex SHA-256 fingerprint of the certificate's DER encoding.

tunnel_id: string

ID of the tunnel the certificate is registered against.

type: "tunnel_certificate"

Create Tunnel Certificate

ant beta:tunnels:certificates create \
  --api-key my-anthropic-api-key \
  --tunnel-id tunnel_id \
  --ca-certificate-pem ca_certificate_pem

{
  "id": "id",
  "archived_at": "2019-12-27T18:11:19.117Z",
  "created_at": "2019-12-27T18:11:19.117Z",
  "expires_at": "2019-12-27T18:11:19.117Z",
  "fingerprint": "fingerprint",
  "tunnel_id": "tunnel_id",
  "type": "tunnel_certificate"
}

Returns Examples

{
  "id": "id",
  "archived_at": "2019-12-27T18:11:19.117Z",
  "created_at": "2019-12-27T18:11:19.117Z",
  "expires_at": "2019-12-27T18:11:19.117Z",
  "fingerprint": "fingerprint",
  "tunnel_id": "tunnel_id",
  "type": "tunnel_certificate"
}