fix: lock verified runtime public keys

crates/workspace-api/src/lib.rs

@@ -1839,6 +1839,15 @@ pub struct CreateRemoteRuntimeRequest {
     pub expected_revision: Option<u64>,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "typescript", derive(ts_rs::TS))]
+#[serde(deny_unknown_fields)]
+pub struct UpdateRemoteRuntimeRequest {
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub display_name: Option<String>,
+    pub endpoint: String,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
 #[cfg_attr(feature = "typescript", derive(ts_rs::TS))]
 #[serde(rename_all = "snake_case")]
@@ -3098,6 +3107,7 @@ pub fn catalog_typescript() -> String {
         RuntimeTrustConflictResponse::decl(&config),
         RuntimePublicIdentityBundle::decl(&config),
         CreateRemoteRuntimeRequest::decl(&config),
+        UpdateRemoteRuntimeRequest::decl(&config),
         RuntimeConnectionTestStatus::decl(&config),
         RuntimeConnectionTestFailureKind::decl(&config),
         RuntimeConnectionTestResponse::decl(&config),
@@ -3617,6 +3627,33 @@ mod tests {
         }
     }
 
+    #[test]
+    fn remote_runtime_metadata_update_cannot_carry_public_key_authority() {
+        let request = UpdateRemoteRuntimeRequest {
+            display_name: Some("Runtime A".to_string()),
+            endpoint: "https://runtime.example.test".to_string(),
+        };
+        assert_eq!(
+            serde_json::to_value(&request).unwrap(),
+            serde_json::json!({
+                "display_name": "Runtime A",
+                "endpoint": "https://runtime.example.test",
+            })
+        );
+        assert!(
+            serde_json::from_value::<UpdateRemoteRuntimeRequest>(serde_json::json!({
+                "display_name": "Runtime A",
+                "endpoint": "https://runtime.example.test",
+                "public_bundle": {
+                    "identity_id": "runtime-a",
+                    "public_key": "yoi-ed25519-pub:v1:not-accepted",
+                },
+            }))
+            .is_err(),
+            "metadata updates must reject public key fields"
+        );
+    }
+
     #[test]
     fn worker_launch_optional_omission_and_request_shape_are_stable() {
         assert_eq!(

crates/workspace-server/src/server.rs

@@ -93,9 +93,9 @@ use workspace_api::{
     RuntimeManagementSummary, RuntimeTrustAuditAction, RuntimeTrustAuditEntry,
     RuntimeTrustConflictKind, RuntimeTrustConflictResponse, RuntimeTrustKeyRevealResponse,
     RuntimeTrustKeyState, RuntimeTrustKeyStatus, TICKET_ORCHESTRATION_PLANS_QUERY_PATH,
-    TICKET_RELATIONS_QUERY_PATH, UpdateWorkspaceMetadataRequest, WhoamiResponse,
-    WorkerLaunchOptionsResponse, WorkerLaunchProfileCandidate, WorkerLaunchRuntimeOption,
-    WorkerLaunchWorkerSummary,
+    TICKET_RELATIONS_QUERY_PATH, UpdateRemoteRuntimeRequest, UpdateWorkspaceMetadataRequest,
+    WhoamiResponse, WorkerLaunchOptionsResponse, WorkerLaunchProfileCandidate,
+    WorkerLaunchRuntimeOption, WorkerLaunchWorkerSummary,
     WorkingDirectoryCreateRequest as BrowserWorkingDirectoryCreateRequest,
     WorkingDirectoryCreateResponse as BrowserWorkingDirectoryCreateResponse,
     WorkingDirectoryDetailResponse as BrowserWorkingDirectoryDetailResponse,
@@ -3420,7 +3420,9 @@ fn build_inner_router(api: WorkspaceApi) -> Router {
         )
         .route(
             "/api/w/{workspace_id}/runtimes/{runtime_id}",
-            get(scoped_get_runtime_detail).delete(scoped_delete_remote_runtime),
+            get(scoped_get_runtime_detail)
+                .post(scoped_update_remote_runtime)
+                .delete(scoped_delete_remote_runtime),
         )
         .route(
             "/api/w/{workspace_id}/runtimes/{runtime_id}/trust-key",
@@ -12075,6 +12077,60 @@ async fn scoped_get_runtime_detail(
     ))
 }
 
+async fn scoped_update_remote_runtime(
+    State(api): State<WorkspaceApi>,
+    AxumPath(path): AxumPath<ScopedRuntimePath>,
+    Extension(actor): Extension<RequestActor>,
+    Json(request): Json<UpdateRemoteRuntimeRequest>,
+) -> ApiResult<Json<WorkspaceRuntimeDetail>> {
+    validate_workspace_scope(&api, &path.workspace_id)?;
+    require_workspace_owner(
+        &api,
+        &path.workspace_id,
+        &actor,
+        "manage Workspace Runtimes",
+    )
+    .await?;
+    if path.runtime_id == EMBEDDED_WORKER_RUNTIME_ID {
+        return Err(settings_bad_request(
+            "embedded_runtime_not_config_managed",
+            "the embedded Runtime is built in and cannot be edited",
+        ));
+    }
+    let endpoint =
+        validate_runtime_metadata(request.display_name.as_deref(), &request.endpoint).await?;
+    let display_name = request
+        .display_name
+        .as_deref()
+        .map(str::trim)
+        .filter(|value| !value.is_empty())
+        .unwrap_or(&path.runtime_id);
+    let binding = api
+        .store
+        .update_workspace_runtime_binding_metadata(
+            &path.workspace_id,
+            &path.runtime_id,
+            display_name,
+            endpoint.as_str().trim_end_matches('/'),
+            &Utc::now().to_rfc3339(),
+        )
+        .await?;
+    let activate_runtime = binding.state == StoredRuntimeBindingState::Verified;
+    api.runtime_binding_expectations
+        .write()
+        .unwrap_or_else(std::sync::PoisonError::into_inner)
+        .insert(
+            (path.workspace_id.clone(), path.runtime_id.clone()),
+            binding.clone(),
+        );
+    api.runtime_subscription_broker
+        .unregister_runtime(&path.runtime_id);
+    api.register_workspace_runtime_binding(binding, activate_runtime)?;
+    Ok(Json(
+        workspace_runtime_detail(&api, &path.workspace_id, &path.runtime_id).await?,
+    ))
+}
+
 async fn scoped_reveal_runtime_trust_key(
     State(api): State<WorkspaceApi>,
     AxumPath(path): AxumPath<ScopedRuntimePath>,
@@ -16593,7 +16649,11 @@ async fn validate_runtime_connection_request(
             "Runtime public bundle must contain a public key",
         ));
     }
-    let endpoint = Url::parse(request.endpoint.trim()).map_err(|_| {
+    validate_runtime_metadata(request.display_name.as_deref(), &request.endpoint).await
+}
+
+async fn validate_runtime_metadata(display_name: Option<&str>, endpoint: &str) -> ApiResult<Url> {
+    let endpoint = Url::parse(endpoint.trim()).map_err(|_| {
         settings_bad_request(
             "invalid_remote_runtime_endpoint",
             "endpoint must be an absolute HTTP or HTTPS URL",
@@ -16656,11 +16716,7 @@ async fn validate_runtime_connection_request(
             ));
         }
     }
-    if request
-        .display_name
-        .as_deref()
-        .is_some_and(|value| value.is_empty() || value.chars().any(char::is_control))
-    {
+    if display_name.is_some_and(|value| value.is_empty() || value.chars().any(char::is_control)) {
         return Err(settings_bad_request(
             "invalid_remote_runtime_display_name",
             "display_name must be non-empty when supplied and cannot contain control characters",
@@ -20869,6 +20925,124 @@ mod tests {
         );
     }
 
+    #[tokio::test]
+    async fn verified_remote_runtime_metadata_update_preserves_public_key_and_verification() {
+        let dir = tempfile::tempdir().unwrap();
+        let api = test_api(dir.path()).await;
+        let actor = test_owner_actor();
+        let workspace_identity = api
+            .signing_identities
+            .provision_existing(&api.config.workspace_id, &actor.account_id)
+            .unwrap();
+        let runtime_identity = RuntimeIdentityMaterial::generate("verified-runtime").unwrap();
+        api.store
+            .upsert_workspace_runtime_binding_record(
+                WorkspaceRuntimeBinding {
+                    workspace_id: api.config.workspace_id.clone(),
+                    runtime_id: "verified-runtime".to_string(),
+                    display_name: "Old label".to_string(),
+                    base_url: "https://8.8.8.8".to_string(),
+                    public_key: runtime_identity.public_key.clone(),
+                    public_key_fingerprint: String::new(),
+                    binding_revision: 1,
+                    state: StoredRuntimeBindingState::Configured,
+                    authentication_mode: StoredRuntimeAuthenticationMode::WorkspaceIdentity,
+                    workspace_key_id: Some(workspace_identity.key_id.clone()),
+                    workspace_key_generation: Some(workspace_identity.revision),
+                    created_at: "1".to_string(),
+                    updated_at: "1".to_string(),
+                    revoked_at: None,
+                },
+                false,
+            )
+            .await
+            .unwrap();
+        let configured = api
+            .store
+            .get_workspace_runtime_binding(&api.config.workspace_id, "verified-runtime")
+            .await
+            .unwrap()
+            .unwrap();
+        let evidence = crate::store::WorkspaceRuntimeVerificationEvidence {
+            workspace_id: configured.workspace_id.clone(),
+            runtime_id: configured.runtime_id.clone(),
+            binding_revision: configured.binding_revision,
+            workspace_key_id: workspace_identity.key_id,
+            workspace_identity_revision: workspace_identity.revision,
+            workspace_trust_generation: workspace_identity.revision,
+            runtime_public_key_fingerprint: configured.public_key_fingerprint.clone(),
+            runtime_identity_revision: 1,
+            challenge_id: "verified-metadata-update".to_string(),
+            state: "verified".to_string(),
+            last_outcome: "verified".to_string(),
+            verified_at: Some("2".to_string()),
+            checked_at: "2".to_string(),
+        };
+        api.store
+            .record_workspace_runtime_verification_attempt(&evidence)
+            .await
+            .unwrap();
+        api.store
+            .complete_workspace_runtime_verification(&evidence)
+            .await
+            .unwrap();
+
+        let Json(updated) = scoped_update_remote_runtime(
+            State(api.clone()),
+            AxumPath(ScopedRuntimePath {
+                workspace_id: api.config.workspace_id.clone(),
+                runtime_id: "verified-runtime".to_string(),
+            }),
+            Extension(actor.clone()),
+            Json(UpdateRemoteRuntimeRequest {
+                display_name: Some("New label".to_string()),
+                endpoint: "https://8.8.4.4".to_string(),
+            }),
+        )
+        .await
+        .unwrap();
+
+        assert_eq!(updated.runtime.runtime.label, "New label");
+        assert_eq!(updated.endpoint.as_deref(), Some("https://8.8.4.4"));
+        let binding = updated.runtime.management.binding.unwrap();
+        assert_eq!(binding.state, WorkspaceRuntimeBindingState::Verified);
+        assert_eq!(binding.revision, 1);
+        assert_eq!(binding.verification.unwrap().binding_revision, 1);
+        assert_eq!(
+            updated.trust_key.fingerprint.as_deref(),
+            Some(configured.public_key_fingerprint.as_str())
+        );
+        let stored = api
+            .store
+            .get_workspace_runtime_binding(&api.config.workspace_id, "verified-runtime")
+            .await
+            .unwrap()
+            .unwrap();
+        assert_eq!(stored.public_key, runtime_identity.public_key);
+        assert_eq!(
+            stored.public_key_fingerprint,
+            configured.public_key_fingerprint
+        );
+
+        let replacement = RuntimeIdentityMaterial::generate("verified-runtime").unwrap();
+        let error = create_remote_runtime(
+            State(api),
+            Extension(actor),
+            Json(CreateRemoteRuntimeRequest {
+                public_bundle: workspace_api::RuntimePublicIdentityBundle {
+                    identity_id: "verified-runtime".to_string(),
+                    public_key: replacement.public_key,
+                },
+                display_name: Some("New label".to_string()),
+                endpoint: "https://8.8.4.4".to_string(),
+                expected_revision: Some(1),
+            }),
+        )
+        .await
+        .unwrap_err();
+        assert_eq!(error.into_response().status(), StatusCode::CONFLICT);
+    }
+
     #[tokio::test]
     async fn remote_runtime_registration_is_workspace_scoped_revisioned_and_configured() {
         let dir = tempfile::tempdir().unwrap();

crates/workspace-server/src/store.rs

@@ -832,6 +832,14 @@ pub trait ControlPlaneStore: Send + Sync + WorkspaceDeletionStore {
         expected_revision: Option<u64>,
         actor_account_id: &str,
     ) -> Result<(WorkspaceRuntimeBindingMutation, WorkspaceRuntimeBinding)>;
+    async fn update_workspace_runtime_binding_metadata(
+        &self,
+        workspace_id: &str,
+        runtime_id: &str,
+        display_name: &str,
+        base_url: &str,
+        updated_at: &str,
+    ) -> Result<WorkspaceRuntimeBinding>;
     async fn revoke_workspace_runtime_binding_key(
         &self,
         workspace_id: &str,
@@ -2277,6 +2285,59 @@ impl SqliteWorkspaceStore {
         })
     }
 
+    pub fn update_workspace_runtime_binding_metadata(
+        &self,
+        workspace_id: &str,
+        runtime_id: &str,
+        display_name: &str,
+        base_url: &str,
+        updated_at: &str,
+    ) -> Result<WorkspaceRuntimeBinding> {
+        validate_identifier("workspace_id", workspace_id)?;
+        validate_identifier("runtime_id", runtime_id)?;
+        validate_non_empty("runtime display_name", display_name)?;
+        validate_runtime_base_url(base_url)?;
+        validate_non_empty("updated_at", updated_at)?;
+        self.with_conn_mut(|conn| {
+            let tx = conn.transaction_with_behavior(TransactionBehavior::Immediate)?;
+            let existing = tx
+                .query_row(
+                    r#"SELECT workspace_id, runtime_id, display_name, base_url, public_key,
+                              public_key_fingerprint, binding_revision, state, authentication_mode,
+                          workspace_key_id, workspace_key_generation, created_at, updated_at, revoked_at
+                       FROM workspace_runtime_bindings
+                       WHERE workspace_id = ?1 AND runtime_id = ?2"#,
+                    params![workspace_id, runtime_id],
+                    read_workspace_runtime_binding,
+                )
+                .optional()?
+                .ok_or_else(|| Error::RuntimeBindingNotFound {
+                    runtime_id: runtime_id.to_string(),
+                })?;
+            if existing.display_name == display_name && existing.base_url == base_url {
+                tx.commit()?;
+                return Ok(existing);
+            }
+            tx.execute(
+                r#"UPDATE workspace_runtime_bindings
+                   SET display_name = ?3, base_url = ?4, updated_at = ?5
+                   WHERE workspace_id = ?1 AND runtime_id = ?2"#,
+                params![workspace_id, runtime_id, display_name, base_url, updated_at],
+            )?;
+            let updated = tx.query_row(
+                r#"SELECT workspace_id, runtime_id, display_name, base_url, public_key,
+                          public_key_fingerprint, binding_revision, state, authentication_mode,
+                          workspace_key_id, workspace_key_generation, created_at, updated_at, revoked_at
+                   FROM workspace_runtime_bindings
+                   WHERE workspace_id = ?1 AND runtime_id = ?2"#,
+                params![workspace_id, runtime_id],
+                read_workspace_runtime_binding,
+            )?;
+            tx.commit()?;
+            Ok(updated)
+        })
+    }
+
     pub fn revoke_workspace_runtime_binding_key(
         &self,
         workspace_id: &str,
@@ -3505,6 +3566,24 @@ impl ControlPlaneStore for SqliteWorkspaceStore {
         )
     }
 
+    async fn update_workspace_runtime_binding_metadata(
+        &self,
+        workspace_id: &str,
+        runtime_id: &str,
+        display_name: &str,
+        base_url: &str,
+        updated_at: &str,
+    ) -> Result<WorkspaceRuntimeBinding> {
+        SqliteWorkspaceStore::update_workspace_runtime_binding_metadata(
+            self,
+            workspace_id,
+            runtime_id,
+            display_name,
+            base_url,
+            updated_at,
+        )
+    }
+
     async fn revoke_workspace_runtime_binding_key(
         &self,
         workspace_id: &str,

web/workspace/src/lib/generated/workspace-api.ts

@@ -496,6 +496,11 @@ export type CreateRemoteRuntimeRequest = {
   expected_revision?: number | null;
 };
 
+export type UpdateRemoteRuntimeRequest = {
+  display_name?: string | null;
+  endpoint: string;
+};
+
 export type RuntimeConnectionTestStatus = "compatible" | "failed";
 
 export type RuntimeConnectionTestFailureKind =

web/workspace/src/lib/workspace/api/runtime-management.ts

@@ -16,6 +16,7 @@ import type {
   RuntimeTrustKeyState,
   RuntimeTrustKeyStatus,
   RuntimeVerificationEvidenceSummary,
+  UpdateRemoteRuntimeRequest,
   WorkspaceRuntimeBindingState,
   WorkspaceRuntimeBindingSummary,
   WorkspaceRuntimeDetail,
@@ -919,6 +920,26 @@ export async function createRemoteRuntime(
   return runtime;
 }
 
+export async function updateRemoteRuntime(
+  workspaceId: string,
+  runtimeId: string,
+  request: UpdateRemoteRuntimeRequest,
+  fetchImpl: typeof fetch = fetch,
+): Promise<WorkspaceRuntimeDetail> {
+  const response = await fetchImpl(
+    workspaceApiPath(
+      workspaceId,
+      `/runtimes/${encodeURIComponent(runtimeId)}`,
+    ),
+    {
+      method: "POST",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify(request),
+    },
+  );
+  return finishMutation(response, workspaceId, runtimeId);
+}
+
 export async function deleteRemoteRuntime(
   workspaceId: string,
   runtimeId: string,

web/workspace/src/lib/workspace/styles/settings.css

@@ -445,6 +445,20 @@
     overflow-wrap: anywhere;
   }
 
+  .runtime-public-key-readonly {
+    display: grid;
+    gap: var(--space-1);
+    max-width: 56rem;
+  }
+
+  .runtime-public-key-readonly p {
+    color: var(--text-muted);
+  }
+
+  .runtime-public-key-readonly code {
+    overflow-wrap: anywhere;
+  }
+
   .runtime-trust-form {
     display: grid;
     gap: var(--space-2);

web/workspace/src/routes/w/[workspaceId]/settings/runtimes/[runtimeId]/+page.svelte

@@ -10,6 +10,7 @@
     previewRuntimePublicKeyFingerprint,
     revealRuntimeTrustKey,
     revokeRuntimeTrustKey,
+    updateRemoteRuntime,
     RuntimeTrustConflictError,
     RuntimeTrustRouteFence,
     RuntimeTrustRequestError,
@@ -23,8 +24,11 @@
   let showPublicKey = $state(false);
   let revealedPublicKey = $state<string | null>(null);
   let publicKey = $state('');
+  let displayName = $state('');
+  let endpoint = $state('');
+  let editingMetadata = $state(false);
   let deleteRuntimeConfirmation = $state('');
-  let busyAction = $state<'save' | 'revoke' | 'reveal' | 'copy' | 'delete' | null>(null);
+  let busyAction = $state<'metadata' | 'trust' | 'revoke' | 'reveal' | 'copy' | 'delete' | null>(null);
   let fieldError = $state<string | null>(null);
   let deleteRuntimeError = $state<string | null>(null);
   let requestError = $state<string | null>(null);
@@ -43,6 +47,9 @@
     showPublicKey = false;
     revealedPublicKey = null;
     publicKey = '';
+    displayName = data.runtimeDetail?.runtime.label ?? '';
+    endpoint = data.runtimeDetail?.endpoint ?? '';
+    editingMetadata = false;
     deleteRuntimeConfirmation = '';
     busyAction = null;
     fieldError = null;
@@ -105,6 +112,49 @@
     return routeFence.isCurrent(operation, data.runtimeId);
   }
 
+  function cancelRuntimeMetadataEdit(): void {
+    displayName = data.runtimeDetail?.runtime.label ?? '';
+    endpoint = data.runtimeDetail?.endpoint ?? '';
+    editingMetadata = false;
+    requestError = null;
+  }
+
+  async function saveRuntimeMetadata(event: SubmitEvent): Promise<void> {
+    event.preventDefault();
+    if (busyAction !== null || !data.runtimeDetail) return;
+
+    requestError = null;
+    successMessage = null;
+    const normalizedDisplayName = displayName.trim();
+    const normalizedEndpoint = endpoint.trim();
+    if (!normalizedDisplayName) {
+      requestError = 'Enter a Runtime label.';
+      return;
+    }
+    if (!normalizedEndpoint) {
+      requestError = 'Enter the Runtime endpoint.';
+      return;
+    }
+
+    const operation = routeFence.capture(data.runtimeId);
+    busyAction = 'metadata';
+    try {
+      await updateRemoteRuntime(data.workspaceId, operation.runtimeId, {
+        display_name: normalizedDisplayName,
+        endpoint: normalizedEndpoint,
+      });
+      if (!isCurrentRoute(operation)) return;
+      successMessage = 'Runtime settings were updated.';
+      editingMetadata = false;
+      await reloadAuthority();
+    } catch (error) {
+      if (!isCurrentRoute(operation)) return;
+      requestError = error instanceof Error ? error.message : 'Runtime settings update failed.';
+    } finally {
+      if (isCurrentRoute(operation)) busyAction = null;
+    }
+  }
+
   async function saveTrustKey(event: SubmitEvent): Promise<void> {
     event.preventDefault();
     if (busyAction !== null || !data.runtimeDetail) return;
@@ -135,7 +185,7 @@
     const action = trustAction(trust.status);
 
     const operation = routeFence.capture(data.runtimeId);
-    busyAction = 'save';
+    busyAction = 'trust';
     try {
       const binding = data.runtimeDetail.runtime.management.binding;
       if (!binding || !data.runtimeDetail.endpoint) {
@@ -339,6 +389,7 @@
     {@const detail = data.runtimeDetail}
     {@const runtime = detail.runtime}
     {@const trust = detail.trust_key}
+    {@const verifiedTrust = runtime.management.binding?.state === 'verified'}
     {@const currentAction = trustAction(trust.status)}
 
     <section class="runtime-detail-section" aria-labelledby="runtime-identity-heading">
@@ -373,6 +424,50 @@
     </section>
 
     {#if data.workspace.permissions.manage_runtimes && !runtime.management.built_in}
+      <section class="runtime-detail-section" aria-labelledby="runtime-settings-heading">
+        <h2 id="runtime-settings-heading">Runtime settings</h2>
+        {#if editingMetadata}
+          <form class="runtime-trust-form" onsubmit={saveRuntimeMetadata}>
+            <label for="runtime-display-name-input">Label</label>
+            <input
+              id="runtime-display-name-input"
+              bind:value={displayName}
+              autocomplete="off"
+              disabled={busyAction !== null}
+            />
+            <label for="runtime-endpoint-input">Endpoint</label>
+            <input
+              id="runtime-endpoint-input"
+              bind:value={endpoint}
+              inputmode="url"
+              autocomplete="url"
+              spellcheck="false"
+              disabled={busyAction !== null}
+            />
+            <div class="settings-action-row">
+              <button type="submit" disabled={busyAction !== null}>
+                {busyAction === 'metadata' ? 'Saving…' : 'Save Runtime settings'}
+              </button>
+              <button
+                class="settings-secondary-action"
+                type="button"
+                onclick={cancelRuntimeMetadataEdit}
+                disabled={busyAction !== null}
+              >Cancel</button>
+            </div>
+          </form>
+        {:else}
+          <div class="settings-action-row">
+            <button
+              class="settings-secondary-action"
+              type="button"
+              onclick={() => (editingMetadata = true)}
+              disabled={busyAction !== null}
+            >Edit Runtime</button>
+          </div>
+        {/if}
+      </section>
+
       <section class="runtime-detail-section" aria-labelledby="runtime-trust-heading">
         <h2 id="runtime-trust-heading">Workspace trust</h2>
 
@@ -395,7 +490,16 @@
           {/if}
         {/if}
 
-        <form class="runtime-trust-form" onsubmit={saveTrustKey}>
+        {#if verifiedTrust}
+          <div class="runtime-public-key-readonly">
+            <strong>Runtime public key</strong>
+            <p>
+              This verified key is read-only. Revoke Workspace trust and register the Runtime again to use a different public key.
+            </p>
+            <code>{trust.fingerprint}</code>
+          </div>
+        {:else}
+          <form class="runtime-trust-form" onsubmit={saveTrustKey}>
           <label for="runtime-public-key-input">Runtime public key</label>
           <textarea
             id="runtime-public-key-input"
@@ -427,10 +531,11 @@
           {/if}
           <div class="settings-action-row">
             <button type="submit" disabled={busyAction !== null}>
-              {busyAction === 'save' ? 'Saving…' : actionLabel(currentAction)}
+              {busyAction === 'trust' ? 'Saving…' : actionLabel(currentAction)}
             </button>
           </div>
-        </form>
+          </form>
+        {/if}
 
         <div class="runtime-revoke-row">
           <div>

web/workspace/tests/runtime-management-source.test.ts

@@ -129,8 +129,29 @@ Deno.test("Runtime detail keeps trust controls owner-only and conflict-safe", as
 
   const ownerGate = page.indexOf("data.workspace.permissions.manage_runtimes");
   const reveal = page.indexOf("Reveal public key");
+  const verifiedKey = page.indexOf("{#if verifiedTrust}");
   const mutation = page.indexOf('id="runtime-public-key-input"');
+  const metadataStart = page.indexOf("async function saveRuntimeMetadata");
+  const trustStart = page.indexOf("async function saveTrustKey");
+  const metadataMutation = page.slice(metadataStart, trustStart);
   assert(ownerGate >= 0, "Runtime trust controls should use manage_runtimes");
+  assert(
+    verifiedKey >= 0 && verifiedKey < mutation &&
+      page.slice(verifiedKey, mutation).includes("{:else}"),
+    "verified Runtime public key must be read-only while unverified trust keeps key input",
+  );
+  assert(
+    metadataMutation.includes("updateRemoteRuntime(") &&
+      metadataMutation.includes("display_name: normalizedDisplayName") &&
+      metadataMutation.includes("endpoint: normalizedEndpoint"),
+    "mutable Runtime settings should use the metadata-only update request",
+  );
+  assert(
+    !metadataMutation.includes("publicKey") &&
+      !metadataMutation.includes("public_bundle") &&
+      !metadataMutation.includes("public_key"),
+    "verified Runtime metadata updates must not carry public key authority",
+  );
   assert(
     page.includes("Current fingerprint"),
     "current fingerprint must be explicit",
@@ -168,6 +189,10 @@ Deno.test("Runtime detail keeps trust controls owner-only and conflict-safe", as
       "routeFence.enter(data.runtimeId)",
       "showPublicKey = false",
       "revealedPublicKey = null",
+      "saveRuntimeMetadata",
+      "Runtime settings",
+      "Edit Runtime",
+      "This verified key is read-only",
       "publicKey = ''",
       "requestError = null",
       "successMessage = null",

web/workspace/tests/runtime-management.test.ts

@@ -13,6 +13,7 @@ import {
   revokeRuntimeTrustKey,
   RuntimeTrustConflictError,
   RuntimeTrustRouteFence,
+  updateRemoteRuntime,
 } from "../src/lib/workspace/api/runtime-management.ts";
 
 function assert(condition: unknown, message: string): asserts condition {
@@ -273,6 +274,45 @@ Deno.test("mismatched revoke fingerprint never sends a request", async () => {
   assert(requests === 0, "mismatched fingerprint sent a revoke request");
 });
 
+Deno.test("Runtime metadata update never sends public key authority", async () => {
+  let requestedUrl = "";
+  let requestedMethod = "";
+  let requestedBody: unknown = null;
+  const fetchImpl = ((input: string | URL | Request, init?: RequestInit) => {
+    requestedUrl = String(input);
+    requestedMethod = init?.method ?? "GET";
+    requestedBody = JSON.parse(String(init?.body));
+    return Promise.resolve(Response.json(detail()));
+  }) as typeof fetch;
+
+  await updateRemoteRuntime(
+    "workspace-a",
+    "arcadia",
+    {
+      display_name: "Updated Runtime",
+      endpoint: "https://runtime.example.test/v2",
+    },
+    fetchImpl,
+  );
+
+  assert(
+    requestedUrl === "/api/w/workspace-a/runtimes/arcadia",
+    `unexpected update URL: ${requestedUrl}`,
+  );
+  assert(requestedMethod === "POST", "Runtime update must use POST");
+  assert(
+    JSON.stringify(requestedBody) ===
+      JSON.stringify({
+        display_name: "Updated Runtime",
+        endpoint: "https://runtime.example.test/v2",
+      }),
+    `unexpected update body: ${JSON.stringify(requestedBody)}`,
+  );
+  const body = requestedBody as Record<string, unknown>;
+  assert(!("public_bundle" in body), "metadata update sent public_bundle");
+  assert(!("public_key" in body), "metadata update sent public_key");
+});
+
 Deno.test("Runtime registration delete uses the Workspace-scoped resource route", async () => {
   let requestedUrl = "";
   let requestedMethod = "";