diff --git a/internal/infra/errs/errs.go b/internal/infra/errs/errs.go
index b4dc80e..24de03c 100644
--- a/internal/infra/errs/errs.go
+++ b/internal/infra/errs/errs.go
@@ -73,6 +73,19 @@ const (
 	CodeJobPayloadInvalid    Code = "job.payload_invalid"
 	CodeJobPayloadTooLarge   Code = "job.payload_too_large"
 	CodeWebhookNotConfigured Code = "webhook.not_configured"
+
+	// ACP 域
+	CodeAcpAgentKindNotFound      Code = "acp.agent_kind_not_found"
+	CodeAcpAgentKindDisabled      Code = "acp.agent_kind_disabled"
+	CodeAcpAgentKindInUse         Code = "acp.agent_kind_in_use"
+	CodeAcpSessionNotFound        Code = "acp.session_not_found"
+	CodeAcpSessionQuotaExceeded   Code = "acp.session_quota_exceeded"
+	CodeAcpSessionNotOwned        Code = "acp.session_not_owned"
+	CodeAcpSessionTerminated      Code = "acp.session_terminated"
+	CodeAcpSessionBranchConflict  Code = "acp.session_branch_conflict"
+	CodeAcpSpawnFailed            Code = "acp.spawn_failed"
+	CodeAcpHandshakeTimeout       Code = "acp.handshake_timeout"
+	CodeAcpFsPathOutsideWorktree  Code = "acp.fs_path_outside_worktree"
 )
 
 // AppError is the application's structured error type. It carries a stable
@@ -182,6 +195,19 @@ func HTTPStatus(code Code) int {
 		return http.StatusNotFound
 	case CodeJobInvalidType, CodeJobPayloadInvalid, CodeJobPayloadTooLarge:
 		return http.StatusBadRequest
+	case CodeAcpAgentKindNotFound, CodeAcpSessionNotFound:
+		return http.StatusNotFound
+	case CodeAcpAgentKindDisabled, CodeAcpAgentKindInUse,
+		CodeAcpSessionTerminated, CodeAcpSessionBranchConflict:
+		return http.StatusConflict
+	case CodeAcpSessionQuotaExceeded:
+		return http.StatusTooManyRequests
+	case CodeAcpSessionNotOwned:
+		return http.StatusForbidden
+	case CodeAcpSpawnFailed, CodeAcpHandshakeTimeout:
+		return http.StatusBadGateway
+	case CodeAcpFsPathOutsideWorktree:
+		return http.StatusInternalServerError
 	case CodeWebhookNotConfigured:
 		return http.StatusServiceUnavailable
 	default: