diff --git a/progenitor-impl/src/method.rs b/progenitor-impl/src/method.rs
index 790d027..c9dd43e 100644
--- a/progenitor-impl/src/method.rs
+++ b/progenitor-impl/src/method.rs
@@ -1550,7 +1550,7 @@ impl Generator {
             })
             .collect::<Result<Vec<_>>>()?;
 
-        // For builders we map `Ok` values to perform a `try_into` to attempt
+        // For builders we map `Ok` values to perform a `try_from` to attempt
         // to convert the builder into the desired type. No "finalization" is
         // required for non-builders (required or optional).
         let param_finalize = method
@@ -1562,9 +1562,8 @@ impl Generator {
                     if ty.builder().is_some() {
                         let type_name = ty.ident();
                         Ok(quote! {
-                            .and_then(
-                                std::convert::TryInto::<#type_name>::try_into
-                            )
+                            .and_then(|v| #type_name::try_from(v)
+                                .map_err(|e| e.to_string()))
                         })
                     } else {
                         Ok(quote! {})
diff --git a/progenitor-impl/tests/output/buildomat-builder-tagged.out b/progenitor-impl/tests/output/buildomat-builder-tagged.out
index b4e6eaf..324c81a 100644
--- a/progenitor-impl/tests/output/buildomat-builder-tagged.out
+++ b/progenitor-impl/tests/output/buildomat-builder-tagged.out
@@ -2539,7 +2539,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::TaskSubmitResult>, Error<()>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::TaskSubmit>::try_into)
+                .and_then(|v| types::TaskSubmit::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/tasks", client.baseurl,);
             let request = client
@@ -2794,7 +2794,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::UserCreateResult>, Error<()>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::UserCreate>::try_into)
+                .and_then(|v| types::UserCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/users", client.baseurl,);
             let request = client
@@ -2941,7 +2941,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::WorkerBootstrapResult>, Error<()>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::WorkerBootstrap>::try_into)
+                .and_then(|v| types::WorkerBootstrap::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/worker/bootstrap", client.baseurl,);
             let request = client
@@ -3052,7 +3052,7 @@ pub mod builder {
             let Self { client, task, body } = self;
             let task = task.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::WorkerAppendTask>::try_into)
+                .and_then(|v| types::WorkerAppendTask::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/worker/task/{}/append",
@@ -3196,7 +3196,7 @@ pub mod builder {
             let Self { client, task, body } = self;
             let task = task.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::WorkerCompleteTask>::try_into)
+                .and_then(|v| types::WorkerCompleteTask::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/worker/task/{}/complete",
@@ -3267,7 +3267,7 @@ pub mod builder {
             let Self { client, task, body } = self;
             let task = task.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::WorkerAddOutput>::try_into)
+                .and_then(|v| types::WorkerAddOutput::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/worker/task/{}/output",
diff --git a/progenitor-impl/tests/output/buildomat-builder.out b/progenitor-impl/tests/output/buildomat-builder.out
index 0924196..2e52a83 100644
--- a/progenitor-impl/tests/output/buildomat-builder.out
+++ b/progenitor-impl/tests/output/buildomat-builder.out
@@ -2539,7 +2539,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::TaskSubmitResult>, Error<()>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::TaskSubmit>::try_into)
+                .and_then(|v| types::TaskSubmit::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/tasks", client.baseurl,);
             let request = client
@@ -2794,7 +2794,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::UserCreateResult>, Error<()>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::UserCreate>::try_into)
+                .and_then(|v| types::UserCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/users", client.baseurl,);
             let request = client
@@ -2941,7 +2941,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::WorkerBootstrapResult>, Error<()>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::WorkerBootstrap>::try_into)
+                .and_then(|v| types::WorkerBootstrap::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/worker/bootstrap", client.baseurl,);
             let request = client
@@ -3052,7 +3052,7 @@ pub mod builder {
             let Self { client, task, body } = self;
             let task = task.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::WorkerAppendTask>::try_into)
+                .and_then(|v| types::WorkerAppendTask::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/worker/task/{}/append",
@@ -3196,7 +3196,7 @@ pub mod builder {
             let Self { client, task, body } = self;
             let task = task.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::WorkerCompleteTask>::try_into)
+                .and_then(|v| types::WorkerCompleteTask::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/worker/task/{}/complete",
@@ -3267,7 +3267,7 @@ pub mod builder {
             let Self { client, task, body } = self;
             let task = task.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::WorkerAddOutput>::try_into)
+                .and_then(|v| types::WorkerAddOutput::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/worker/task/{}/output",
diff --git a/progenitor-impl/tests/output/keeper-builder-tagged.out b/progenitor-impl/tests/output/keeper-builder-tagged.out
index ec137c2..f24797e 100644
--- a/progenitor-impl/tests/output/keeper-builder-tagged.out
+++ b/progenitor-impl/tests/output/keeper-builder-tagged.out
@@ -1396,7 +1396,7 @@ pub mod builder {
             } = self;
             let authorization = authorization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::EnrolBody>::try_into)
+                .and_then(|v| types::EnrolBody::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/enrol", client.baseurl,);
             let mut header_map = HeaderMap::with_capacity(1usize);
@@ -1586,7 +1586,7 @@ pub mod builder {
             } = self;
             let authorization = authorization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ReportFinishBody>::try_into)
+                .and_then(|v| types::ReportFinishBody::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/report/finish", client.baseurl,);
             let mut header_map = HeaderMap::with_capacity(1usize);
@@ -1670,7 +1670,7 @@ pub mod builder {
             } = self;
             let authorization = authorization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ReportOutputBody>::try_into)
+                .and_then(|v| types::ReportOutputBody::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/report/output", client.baseurl,);
             let mut header_map = HeaderMap::with_capacity(1usize);
@@ -1752,7 +1752,7 @@ pub mod builder {
             } = self;
             let authorization = authorization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ReportStartBody>::try_into)
+                .and_then(|v| types::ReportStartBody::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/report/start", client.baseurl,);
             let mut header_map = HeaderMap::with_capacity(1usize);
diff --git a/progenitor-impl/tests/output/keeper-builder.out b/progenitor-impl/tests/output/keeper-builder.out
index d1ac8f0..ea9f176 100644
--- a/progenitor-impl/tests/output/keeper-builder.out
+++ b/progenitor-impl/tests/output/keeper-builder.out
@@ -1396,7 +1396,7 @@ pub mod builder {
             } = self;
             let authorization = authorization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::EnrolBody>::try_into)
+                .and_then(|v| types::EnrolBody::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/enrol", client.baseurl,);
             let mut header_map = HeaderMap::with_capacity(1usize);
@@ -1586,7 +1586,7 @@ pub mod builder {
             } = self;
             let authorization = authorization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ReportFinishBody>::try_into)
+                .and_then(|v| types::ReportFinishBody::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/report/finish", client.baseurl,);
             let mut header_map = HeaderMap::with_capacity(1usize);
@@ -1670,7 +1670,7 @@ pub mod builder {
             } = self;
             let authorization = authorization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ReportOutputBody>::try_into)
+                .and_then(|v| types::ReportOutputBody::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/report/output", client.baseurl,);
             let mut header_map = HeaderMap::with_capacity(1usize);
@@ -1752,7 +1752,7 @@ pub mod builder {
             } = self;
             let authorization = authorization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ReportStartBody>::try_into)
+                .and_then(|v| types::ReportStartBody::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/report/start", client.baseurl,);
             let mut header_map = HeaderMap::with_capacity(1usize);
diff --git a/progenitor-impl/tests/output/nexus-builder-tagged.out b/progenitor-impl/tests/output/nexus-builder-tagged.out
index 14b66bb..107ca3b 100644
--- a/progenitor-impl/tests/output/nexus-builder-tagged.out
+++ b/progenitor-impl/tests/output/nexus-builder-tagged.out
@@ -29137,7 +29137,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<ByteStream>, Error<ByteStream>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::DeviceAuthRequest>::try_into)
+                .and_then(|v| types::DeviceAuthRequest::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/device/auth", client.baseurl,);
             let request = client.client.post(url).form_urlencoded(&body)?.build()?;
@@ -29193,7 +29193,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<()>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::DeviceAuthVerify>::try_into)
+                .and_then(|v| types::DeviceAuthVerify::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/device/confirm", client.baseurl,);
             let request = client
@@ -29265,7 +29265,9 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<ByteStream>, Error<ByteStream>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::DeviceAccessTokenRequest>::try_into)
+                .and_then(|v| {
+                    types::DeviceAccessTokenRequest::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/device/token", client.baseurl,);
             let request = client.client.post(url).form_urlencoded(&body)?.build()?;
@@ -29476,7 +29478,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<()>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::SpoofLoginBody>::try_into)
+                .and_then(|v| types::SpoofLoginBody::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/login", client.baseurl,);
             let request = client
@@ -29566,7 +29568,9 @@ pub mod builder {
             } = self;
             let silo_name = silo_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::UsernamePasswordCredentials>::try_into)
+                .and_then(|v| {
+                    types::UsernamePasswordCredentials::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/login/{}/local",
@@ -29991,7 +29995,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::Organization>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationCreate>::try_into)
+                .and_then(|v| types::OrganizationCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/organizations", client.baseurl,);
             let request = client
@@ -30140,7 +30144,7 @@ pub mod builder {
             } = self;
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationUpdate>::try_into)
+                .and_then(|v| types::OrganizationUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}",
@@ -30361,7 +30365,7 @@ pub mod builder {
             } = self;
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationRolePolicy>::try_into)
+                .and_then(|v| types::OrganizationRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/policy",
@@ -30628,7 +30632,7 @@ pub mod builder {
             } = self;
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectCreate>::try_into)
+                .and_then(|v| types::ProjectCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects",
@@ -30810,7 +30814,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectUpdate>::try_into)
+                .and_then(|v| types::ProjectUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}",
@@ -31185,7 +31189,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskCreate>::try_into)
+                .and_then(|v| types::DiskCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/disks",
@@ -31914,7 +31918,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ImageCreate>::try_into)
+                .and_then(|v| types::ImageCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/images",
@@ -32402,7 +32406,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceCreate>::try_into)
+                .and_then(|v| types::InstanceCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances",
@@ -32919,7 +32923,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let instance_name = instance_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskIdentifier>::try_into)
+                .and_then(|v| types::DiskIdentifier::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances/{}/disks/attach",
@@ -33040,7 +33044,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let instance_name = instance_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskIdentifier>::try_into)
+                .and_then(|v| types::DiskIdentifier::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances/{}/disks/detach",
@@ -33257,7 +33261,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let instance_name = instance_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceMigrate>::try_into)
+                .and_then(|v| types::InstanceMigrate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances/{}/migrate",
@@ -33594,7 +33598,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let instance_name = instance_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::NetworkInterfaceCreate>::try_into)
+                .and_then(|v| types::NetworkInterfaceCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances/{}/network-interfaces",
@@ -33846,7 +33850,7 @@ pub mod builder {
             let instance_name = instance_name.map_err(Error::InvalidRequest)?;
             let interface_name = interface_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::NetworkInterfaceUpdate>::try_into)
+                .and_then(|v| types::NetworkInterfaceUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances/{}/network-interfaces/{}",
@@ -34677,7 +34681,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectRolePolicy>::try_into)
+                .and_then(|v| types::ProjectRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/policy",
@@ -34977,7 +34981,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::SnapshotCreate>::try_into)
+                .and_then(|v| types::SnapshotCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/snapshots",
@@ -35462,7 +35466,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcCreate>::try_into)
+                .and_then(|v| types::VpcCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs",
@@ -35676,7 +35680,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcUpdate>::try_into)
+                .and_then(|v| types::VpcUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}",
@@ -35994,7 +35998,9 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcFirewallRuleUpdateParams>::try_into)
+                .and_then(|v| {
+                    types::VpcFirewallRuleUpdateParams::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/firewall/rules",
@@ -36324,7 +36330,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcRouterCreate>::try_into)
+                .and_then(|v| types::VpcRouterCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/routers",
@@ -36568,7 +36574,7 @@ pub mod builder {
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let router_name = router_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcRouterUpdate>::try_into)
+                .and_then(|v| types::VpcRouterUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/routers/{}",
@@ -37041,7 +37047,9 @@ pub mod builder {
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let router_name = router_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::RouterRouteCreateParams>::try_into)
+                .and_then(|v| {
+                    types::RouterRouteCreateParams::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/routers/{}/routes",
@@ -37319,7 +37327,9 @@ pub mod builder {
             let router_name = router_name.map_err(Error::InvalidRequest)?;
             let route_name = route_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::RouterRouteUpdateParams>::try_into)
+                .and_then(|v| {
+                    types::RouterRouteUpdateParams::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/routers/{}/routes/{}",
@@ -37775,7 +37785,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcSubnetCreate>::try_into)
+                .and_then(|v| types::VpcSubnetCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/subnets",
@@ -38019,7 +38029,7 @@ pub mod builder {
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let subnet_name = subnet_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcSubnetUpdate>::try_into)
+                .and_then(|v| types::VpcSubnetUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/subnets/{}",
@@ -38472,7 +38482,7 @@ pub mod builder {
         ) -> Result<ResponseValue<types::SiloRolePolicy>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::SiloRolePolicy>::try_into)
+                .and_then(|v| types::SiloRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/policy", client.baseurl,);
             let request = client
@@ -39091,7 +39101,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::SshKey>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::SshKeyCreate>::try_into)
+                .and_then(|v| types::SshKeyCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/session/me/sshkeys", client.baseurl,);
             let request = client
@@ -39619,7 +39629,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::Certificate>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::CertificateCreate>::try_into)
+                .and_then(|v| types::CertificateCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/system/certificates", client.baseurl,);
             let request = client
@@ -40734,7 +40744,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::GlobalImage>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::GlobalImageCreate>::try_into)
+                .and_then(|v| types::GlobalImageCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/system/images", client.baseurl,);
             let request = client
@@ -41077,7 +41087,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::IpPool>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::IpPoolCreate>::try_into)
+                .and_then(|v| types::IpPoolCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/system/ip-pools", client.baseurl,);
             let request = client
@@ -41221,7 +41231,7 @@ pub mod builder {
             } = self;
             let pool_name = pool_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::IpPoolUpdate>::try_into)
+                .and_then(|v| types::IpPoolUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/system/ip-pools/{}",
@@ -42150,7 +42160,7 @@ pub mod builder {
         ) -> Result<ResponseValue<types::FleetRolePolicy>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::FleetRolePolicy>::try_into)
+                .and_then(|v| types::FleetRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/system/policy", client.baseurl,);
             let request = client
@@ -42591,7 +42601,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::Silo>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::SiloCreate>::try_into)
+                .and_then(|v| types::SiloCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/system/silos", client.baseurl,);
             let request = client
@@ -42973,7 +42983,7 @@ pub mod builder {
             } = self;
             let silo_name = silo_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::UserCreate>::try_into)
+                .and_then(|v| types::UserCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/system/silos/{}/identity-providers/local/users",
@@ -43242,7 +43252,9 @@ pub mod builder {
             } = self;
             let silo_name = silo_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::SamlIdentityProviderCreate>::try_into)
+                .and_then(|v| {
+                    types::SamlIdentityProviderCreate::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/system/silos/{}/identity-providers/saml",
@@ -43474,7 +43486,7 @@ pub mod builder {
             } = self;
             let silo_name = silo_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::SiloRolePolicy>::try_into)
+                .and_then(|v| types::SiloRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/system/silos/{}/policy",
@@ -44538,7 +44550,7 @@ pub mod builder {
             let organization = organization.map_err(Error::InvalidRequest)?;
             let project = project.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskCreate>::try_into)
+                .and_then(|v| types::DiskCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/disks", client.baseurl,);
             let mut query = Vec::with_capacity(2usize);
@@ -45039,7 +45051,7 @@ pub mod builder {
             let organization = organization.map_err(Error::InvalidRequest)?;
             let project = project.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceCreate>::try_into)
+                .and_then(|v| types::InstanceCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/instances", client.baseurl,);
             let mut query = Vec::with_capacity(2usize);
@@ -45573,7 +45585,7 @@ pub mod builder {
             let organization = organization.map_err(Error::InvalidRequest)?;
             let project = project.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskPath>::try_into)
+                .and_then(|v| types::DiskPath::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/instances/{}/disks/attach",
@@ -45700,7 +45712,7 @@ pub mod builder {
             let organization = organization.map_err(Error::InvalidRequest)?;
             let project = project.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskPath>::try_into)
+                .and_then(|v| types::DiskPath::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/instances/{}/disks/detach",
@@ -45827,7 +45839,7 @@ pub mod builder {
             let organization = organization.map_err(Error::InvalidRequest)?;
             let project = project.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceMigrate>::try_into)
+                .and_then(|v| types::InstanceMigrate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/instances/{}/migrate",
@@ -46626,7 +46638,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::Organization>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationCreate>::try_into)
+                .and_then(|v| types::OrganizationCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/organizations", client.baseurl,);
             let request = client
@@ -46775,7 +46787,7 @@ pub mod builder {
             } = self;
             let organization = organization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationUpdate>::try_into)
+                .and_then(|v| types::OrganizationUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/organizations/{}",
@@ -46996,7 +47008,7 @@ pub mod builder {
             } = self;
             let organization = organization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationRolePolicy>::try_into)
+                .and_then(|v| types::OrganizationRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/organizations/{}/policy",
@@ -47261,7 +47273,7 @@ pub mod builder {
             } = self;
             let organization = organization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectCreate>::try_into)
+                .and_then(|v| types::ProjectCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/projects", client.baseurl,);
             let mut query = Vec::with_capacity(1usize);
@@ -47446,7 +47458,7 @@ pub mod builder {
             let project = project.map_err(Error::InvalidRequest)?;
             let organization = organization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectUpdate>::try_into)
+                .and_then(|v| types::ProjectUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/projects/{}",
@@ -47725,7 +47737,7 @@ pub mod builder {
             let project = project.map_err(Error::InvalidRequest)?;
             let organization = organization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectRolePolicy>::try_into)
+                .and_then(|v| types::ProjectRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/projects/{}/policy",
@@ -48224,7 +48236,7 @@ pub mod builder {
         ) -> Result<ResponseValue<types::UpdateDeployment>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::SystemUpdateStart>::try_into)
+                .and_then(|v| types::SystemUpdateStart::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/system/update/start", client.baseurl,);
             let request = client
diff --git a/progenitor-impl/tests/output/nexus-builder.out b/progenitor-impl/tests/output/nexus-builder.out
index 47a2461..7bad130 100644
--- a/progenitor-impl/tests/output/nexus-builder.out
+++ b/progenitor-impl/tests/output/nexus-builder.out
@@ -29240,7 +29240,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<ByteStream>, Error<ByteStream>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::DeviceAuthRequest>::try_into)
+                .and_then(|v| types::DeviceAuthRequest::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/device/auth", client.baseurl,);
             let request = client.client.post(url).form_urlencoded(&body)?.build()?;
@@ -29296,7 +29296,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<()>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::DeviceAuthVerify>::try_into)
+                .and_then(|v| types::DeviceAuthVerify::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/device/confirm", client.baseurl,);
             let request = client
@@ -29368,7 +29368,9 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<ByteStream>, Error<ByteStream>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::DeviceAccessTokenRequest>::try_into)
+                .and_then(|v| {
+                    types::DeviceAccessTokenRequest::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/device/token", client.baseurl,);
             let request = client.client.post(url).form_urlencoded(&body)?.build()?;
@@ -29579,7 +29581,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<()>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::SpoofLoginBody>::try_into)
+                .and_then(|v| types::SpoofLoginBody::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/login", client.baseurl,);
             let request = client
@@ -29669,7 +29671,9 @@ pub mod builder {
             } = self;
             let silo_name = silo_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::UsernamePasswordCredentials>::try_into)
+                .and_then(|v| {
+                    types::UsernamePasswordCredentials::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/login/{}/local",
@@ -30094,7 +30098,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::Organization>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationCreate>::try_into)
+                .and_then(|v| types::OrganizationCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/organizations", client.baseurl,);
             let request = client
@@ -30243,7 +30247,7 @@ pub mod builder {
             } = self;
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationUpdate>::try_into)
+                .and_then(|v| types::OrganizationUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}",
@@ -30464,7 +30468,7 @@ pub mod builder {
             } = self;
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationRolePolicy>::try_into)
+                .and_then(|v| types::OrganizationRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/policy",
@@ -30731,7 +30735,7 @@ pub mod builder {
             } = self;
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectCreate>::try_into)
+                .and_then(|v| types::ProjectCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects",
@@ -30913,7 +30917,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectUpdate>::try_into)
+                .and_then(|v| types::ProjectUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}",
@@ -31288,7 +31292,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskCreate>::try_into)
+                .and_then(|v| types::DiskCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/disks",
@@ -32017,7 +32021,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ImageCreate>::try_into)
+                .and_then(|v| types::ImageCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/images",
@@ -32505,7 +32509,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceCreate>::try_into)
+                .and_then(|v| types::InstanceCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances",
@@ -33022,7 +33026,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let instance_name = instance_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskIdentifier>::try_into)
+                .and_then(|v| types::DiskIdentifier::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances/{}/disks/attach",
@@ -33143,7 +33147,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let instance_name = instance_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskIdentifier>::try_into)
+                .and_then(|v| types::DiskIdentifier::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances/{}/disks/detach",
@@ -33360,7 +33364,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let instance_name = instance_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceMigrate>::try_into)
+                .and_then(|v| types::InstanceMigrate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances/{}/migrate",
@@ -33697,7 +33701,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let instance_name = instance_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::NetworkInterfaceCreate>::try_into)
+                .and_then(|v| types::NetworkInterfaceCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances/{}/network-interfaces",
@@ -33949,7 +33953,7 @@ pub mod builder {
             let instance_name = instance_name.map_err(Error::InvalidRequest)?;
             let interface_name = interface_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::NetworkInterfaceUpdate>::try_into)
+                .and_then(|v| types::NetworkInterfaceUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/instances/{}/network-interfaces/{}",
@@ -34780,7 +34784,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectRolePolicy>::try_into)
+                .and_then(|v| types::ProjectRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/policy",
@@ -35080,7 +35084,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::SnapshotCreate>::try_into)
+                .and_then(|v| types::SnapshotCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/snapshots",
@@ -35565,7 +35569,7 @@ pub mod builder {
             let organization_name = organization_name.map_err(Error::InvalidRequest)?;
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcCreate>::try_into)
+                .and_then(|v| types::VpcCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs",
@@ -35779,7 +35783,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcUpdate>::try_into)
+                .and_then(|v| types::VpcUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}",
@@ -36097,7 +36101,9 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcFirewallRuleUpdateParams>::try_into)
+                .and_then(|v| {
+                    types::VpcFirewallRuleUpdateParams::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/firewall/rules",
@@ -36427,7 +36433,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcRouterCreate>::try_into)
+                .and_then(|v| types::VpcRouterCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/routers",
@@ -36671,7 +36677,7 @@ pub mod builder {
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let router_name = router_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcRouterUpdate>::try_into)
+                .and_then(|v| types::VpcRouterUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/routers/{}",
@@ -37144,7 +37150,9 @@ pub mod builder {
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let router_name = router_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::RouterRouteCreateParams>::try_into)
+                .and_then(|v| {
+                    types::RouterRouteCreateParams::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/routers/{}/routes",
@@ -37422,7 +37430,9 @@ pub mod builder {
             let router_name = router_name.map_err(Error::InvalidRequest)?;
             let route_name = route_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::RouterRouteUpdateParams>::try_into)
+                .and_then(|v| {
+                    types::RouterRouteUpdateParams::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/routers/{}/routes/{}",
@@ -37878,7 +37888,7 @@ pub mod builder {
             let project_name = project_name.map_err(Error::InvalidRequest)?;
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcSubnetCreate>::try_into)
+                .and_then(|v| types::VpcSubnetCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/subnets",
@@ -38122,7 +38132,7 @@ pub mod builder {
             let vpc_name = vpc_name.map_err(Error::InvalidRequest)?;
             let subnet_name = subnet_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::VpcSubnetUpdate>::try_into)
+                .and_then(|v| types::VpcSubnetUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/organizations/{}/projects/{}/vpcs/{}/subnets/{}",
@@ -38575,7 +38585,7 @@ pub mod builder {
         ) -> Result<ResponseValue<types::SiloRolePolicy>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::SiloRolePolicy>::try_into)
+                .and_then(|v| types::SiloRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/policy", client.baseurl,);
             let request = client
@@ -39194,7 +39204,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::SshKey>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::SshKeyCreate>::try_into)
+                .and_then(|v| types::SshKeyCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/session/me/sshkeys", client.baseurl,);
             let request = client
@@ -39722,7 +39732,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::Certificate>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::CertificateCreate>::try_into)
+                .and_then(|v| types::CertificateCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/system/certificates", client.baseurl,);
             let request = client
@@ -40837,7 +40847,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::GlobalImage>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::GlobalImageCreate>::try_into)
+                .and_then(|v| types::GlobalImageCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/system/images", client.baseurl,);
             let request = client
@@ -41180,7 +41190,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::IpPool>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::IpPoolCreate>::try_into)
+                .and_then(|v| types::IpPoolCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/system/ip-pools", client.baseurl,);
             let request = client
@@ -41324,7 +41334,7 @@ pub mod builder {
             } = self;
             let pool_name = pool_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::IpPoolUpdate>::try_into)
+                .and_then(|v| types::IpPoolUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/system/ip-pools/{}",
@@ -42253,7 +42263,7 @@ pub mod builder {
         ) -> Result<ResponseValue<types::FleetRolePolicy>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::FleetRolePolicy>::try_into)
+                .and_then(|v| types::FleetRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/system/policy", client.baseurl,);
             let request = client
@@ -42694,7 +42704,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::Silo>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::SiloCreate>::try_into)
+                .and_then(|v| types::SiloCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/system/silos", client.baseurl,);
             let request = client
@@ -43076,7 +43086,7 @@ pub mod builder {
             } = self;
             let silo_name = silo_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::UserCreate>::try_into)
+                .and_then(|v| types::UserCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/system/silos/{}/identity-providers/local/users",
@@ -43345,7 +43355,9 @@ pub mod builder {
             } = self;
             let silo_name = silo_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::SamlIdentityProviderCreate>::try_into)
+                .and_then(|v| {
+                    types::SamlIdentityProviderCreate::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/system/silos/{}/identity-providers/saml",
@@ -43577,7 +43589,7 @@ pub mod builder {
             } = self;
             let silo_name = silo_name.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::SiloRolePolicy>::try_into)
+                .and_then(|v| types::SiloRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/system/silos/{}/policy",
@@ -44641,7 +44653,7 @@ pub mod builder {
             let organization = organization.map_err(Error::InvalidRequest)?;
             let project = project.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskCreate>::try_into)
+                .and_then(|v| types::DiskCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/disks", client.baseurl,);
             let mut query = Vec::with_capacity(2usize);
@@ -45142,7 +45154,7 @@ pub mod builder {
             let organization = organization.map_err(Error::InvalidRequest)?;
             let project = project.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceCreate>::try_into)
+                .and_then(|v| types::InstanceCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/instances", client.baseurl,);
             let mut query = Vec::with_capacity(2usize);
@@ -45676,7 +45688,7 @@ pub mod builder {
             let organization = organization.map_err(Error::InvalidRequest)?;
             let project = project.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskPath>::try_into)
+                .and_then(|v| types::DiskPath::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/instances/{}/disks/attach",
@@ -45803,7 +45815,7 @@ pub mod builder {
             let organization = organization.map_err(Error::InvalidRequest)?;
             let project = project.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::DiskPath>::try_into)
+                .and_then(|v| types::DiskPath::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/instances/{}/disks/detach",
@@ -45930,7 +45942,7 @@ pub mod builder {
             let organization = organization.map_err(Error::InvalidRequest)?;
             let project = project.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceMigrate>::try_into)
+                .and_then(|v| types::InstanceMigrate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/instances/{}/migrate",
@@ -46729,7 +46741,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<types::Organization>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationCreate>::try_into)
+                .and_then(|v| types::OrganizationCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/organizations", client.baseurl,);
             let request = client
@@ -46878,7 +46890,7 @@ pub mod builder {
             } = self;
             let organization = organization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationUpdate>::try_into)
+                .and_then(|v| types::OrganizationUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/organizations/{}",
@@ -47099,7 +47111,7 @@ pub mod builder {
             } = self;
             let organization = organization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::OrganizationRolePolicy>::try_into)
+                .and_then(|v| types::OrganizationRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/organizations/{}/policy",
@@ -47364,7 +47376,7 @@ pub mod builder {
             } = self;
             let organization = organization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectCreate>::try_into)
+                .and_then(|v| types::ProjectCreate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/projects", client.baseurl,);
             let mut query = Vec::with_capacity(1usize);
@@ -47549,7 +47561,7 @@ pub mod builder {
             let project = project.map_err(Error::InvalidRequest)?;
             let organization = organization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectUpdate>::try_into)
+                .and_then(|v| types::ProjectUpdate::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/projects/{}",
@@ -47828,7 +47840,7 @@ pub mod builder {
             let project = project.map_err(Error::InvalidRequest)?;
             let organization = organization.map_err(Error::InvalidRequest)?;
             let body = body
-                .and_then(std::convert::TryInto::<types::ProjectRolePolicy>::try_into)
+                .and_then(|v| types::ProjectRolePolicy::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!(
                 "{}/v1/projects/{}/policy",
@@ -48327,7 +48339,7 @@ pub mod builder {
         ) -> Result<ResponseValue<types::UpdateDeployment>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::SystemUpdateStart>::try_into)
+                .and_then(|v| types::SystemUpdateStart::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/v1/system/update/start", client.baseurl,);
             let request = client
diff --git a/progenitor-impl/tests/output/propolis-server-builder-tagged.out b/progenitor-impl/tests/output/propolis-server-builder-tagged.out
index 3c076e9..3a97665 100644
--- a/progenitor-impl/tests/output/propolis-server-builder-tagged.out
+++ b/progenitor-impl/tests/output/propolis-server-builder-tagged.out
@@ -2983,7 +2983,7 @@ pub mod builder {
         ) -> Result<ResponseValue<types::InstanceEnsureResponse>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceEnsureRequest>::try_into)
+                .and_then(|v| types::InstanceEnsureRequest::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/instance", client.baseurl,);
             let request = client
@@ -3137,7 +3137,9 @@ pub mod builder {
         {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceMigrateStatusRequest>::try_into)
+                .and_then(|v| {
+                    types::InstanceMigrateStatusRequest::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/instance/migrate/status", client.baseurl,);
             let request = client
@@ -3312,7 +3314,9 @@ pub mod builder {
         {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceStateMonitorRequest>::try_into)
+                .and_then(|v| {
+                    types::InstanceStateMonitorRequest::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/instance/state-monitor", client.baseurl,);
             let request = client
diff --git a/progenitor-impl/tests/output/propolis-server-builder.out b/progenitor-impl/tests/output/propolis-server-builder.out
index 25efbe8..3eb17ea 100644
--- a/progenitor-impl/tests/output/propolis-server-builder.out
+++ b/progenitor-impl/tests/output/propolis-server-builder.out
@@ -3019,7 +3019,7 @@ pub mod builder {
         ) -> Result<ResponseValue<types::InstanceEnsureResponse>, Error<types::Error>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceEnsureRequest>::try_into)
+                .and_then(|v| types::InstanceEnsureRequest::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/instance", client.baseurl,);
             let request = client
@@ -3173,7 +3173,9 @@ pub mod builder {
         {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceMigrateStatusRequest>::try_into)
+                .and_then(|v| {
+                    types::InstanceMigrateStatusRequest::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/instance/migrate/status", client.baseurl,);
             let request = client
@@ -3348,7 +3350,9 @@ pub mod builder {
         {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::InstanceStateMonitorRequest>::try_into)
+                .and_then(|v| {
+                    types::InstanceStateMonitorRequest::try_from(v).map_err(|e| e.to_string())
+                })
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/instance/state-monitor", client.baseurl,);
             let request = client
diff --git a/progenitor-impl/tests/output/test_default_params_builder.out b/progenitor-impl/tests/output/test_default_params_builder.out
index 02e88aa..8153f5f 100644
--- a/progenitor-impl/tests/output/test_default_params_builder.out
+++ b/progenitor-impl/tests/output/test_default_params_builder.out
@@ -407,7 +407,7 @@ pub mod builder {
         pub async fn send(self) -> Result<ResponseValue<ByteStream>, Error<ByteStream>> {
             let Self { client, body } = self;
             let body = body
-                .and_then(std::convert::TryInto::<types::BodyWithDefaults>::try_into)
+                .and_then(|v| types::BodyWithDefaults::try_from(v).map_err(|e| e.to_string()))
                 .map_err(Error::InvalidRequest)?;
             let url = format!("{}/", client.baseurl,);
             let request = client.client.post(url).json(&body).build()?;