diff --git a/crates/manager-core/src/admin_users_api.rs b/crates/manager-core/src/admin_users_api.rs
index 5bd5466..a1dd465 100644
--- a/crates/manager-core/src/admin_users_api.rs
+++ b/crates/manager-core/src/admin_users_api.rs
@@ -14,18 +14,17 @@ use axum::extract::{Path, State};
 use axum::http::StatusCode;
 use axum::response::{IntoResponse, Json, Response};
 use axum::routing::get;
-use axum::Router;
+use axum::{Extension, Router};
 use chrono::{DateTime, Utc};
-use picloud_shared::AdminUserId;
+use picloud_shared::{AdminUserId, InstanceRole, Principal};
 use serde::{Deserialize, Serialize};
 use serde_json::json;
 
-use picloud_shared::InstanceRole;
-
 use crate::admin_session_repo::AdminSessionRepository;
 use crate::admin_user_repo::{AdminUserRepository, AdminUserRepositoryError, AdminUserRow};
 use crate::api_key_repo::ApiKeyRepository;
 use crate::auth::hash_password;
+use crate::authz::{require, AuthzDenied, AuthzRepo, Capability};
 
 /// Validation knobs are tuned by NIST 800-63B-ish guidance: username is
 /// a strict ASCII subset so the lookup column stays predictable, and
@@ -43,6 +42,9 @@ pub struct AdminsState {
     /// also expires every active API key for that user so cookie and
     /// bearer credentials become inert at the same moment.
     pub keys: Arc<dyn ApiKeyRepository>,
+    /// Capability gate: every endpoint here requires
+    /// `InstanceManageUsers` (owner / admin).
+    pub authz: Arc<dyn AuthzRepo>,
 }
 
 pub fn admins_router(state: AdminsState) -> Router {
@@ -113,15 +115,29 @@ pub struct PatchAdminRequest {
 
 async fn list_admins(
     State(state): State<AdminsState>,
+    Extension(principal): Extension<Principal>,
 ) -> Result<Json<Vec<AdminDto>>, AdminApiError> {
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::InstanceManageUsers,
+    )
+    .await?;
     let rows = state.users.list().await?;
     Ok(Json(rows.into_iter().map(Into::into).collect()))
 }
 
 async fn get_admin(
     State(state): State<AdminsState>,
+    Extension(principal): Extension<Principal>,
     Path(id): Path<AdminUserId>,
 ) -> Result<Json<AdminDto>, AdminApiError> {
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::InstanceManageUsers,
+    )
+    .await?;
     state
         .users
         .get(id)
@@ -133,8 +149,24 @@ async fn get_admin(
 
 async fn create_admin(
     State(state): State<AdminsState>,
+    Extension(principal): Extension<Principal>,
     Json(input): Json<CreateAdminRequest>,
 ) -> Result<(StatusCode, Json<AdminDto>), AdminApiError> {
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::InstanceManageUsers,
+    )
+    .await?;
+    // Minting an owner via the API requires the caller to ALSO be an
+    // owner — admin cannot self-elevate (or elevate someone else)
+    // beyond their own ceiling. Owner-creation by env-var bootstrap
+    // bypasses this path.
+    if input.instance_role == InstanceRole::Owner
+        && principal.instance_role != InstanceRole::Owner
+    {
+        return Err(AdminApiError::CannotEscalate);
+    }
     let username = input.username.trim();
     validate_username(username)?;
     validate_password(&input.password)?;
@@ -148,9 +180,16 @@ async fn create_admin(
 
 async fn patch_admin(
     State(state): State<AdminsState>,
+    Extension(principal): Extension<Principal>,
     Path(id): Path<AdminUserId>,
     Json(input): Json<PatchAdminRequest>,
 ) -> Result<Json<AdminDto>, AdminApiError> {
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::InstanceManageUsers,
+    )
+    .await?;
     // Verify the target exists upfront — keeps the error path uniform
     // for "rename a missing user" etc.
     let current = state
@@ -179,6 +218,12 @@ async fn patch_admin(
     }
 
     if let Some(new_role) = input.instance_role {
+        // Self-elevation guard: only an owner can promote anyone TO
+        // owner. An admin cannot turn themselves (or anyone else)
+        // into one.
+        if new_role == InstanceRole::Owner && principal.instance_role != InstanceRole::Owner {
+            return Err(AdminApiError::CannotEscalate);
+        }
         // Last-active-owner guard: a transition off of `Owner` cannot
         // leave the install with zero owners. The check is on the
         // source role (current.instance_role) so demoting an
@@ -249,8 +294,15 @@ async fn patch_admin(
 
 async fn delete_admin(
     State(state): State<AdminsState>,
+    Extension(principal): Extension<Principal>,
     Path(id): Path<AdminUserId>,
 ) -> Result<StatusCode, AdminApiError> {
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::InstanceManageUsers,
+    )
+    .await?;
     let target = state
         .users
         .get(id)
@@ -328,6 +380,15 @@ pub enum AdminApiError {
     #[error("cannot leave the system with zero active owners")]
     LastActiveOwner,
 
+    #[error("only an owner can grant the owner role")]
+    CannotEscalate,
+
+    #[error("forbidden")]
+    Forbidden,
+
+    #[error("authorization repo error: {0}")]
+    AuthzRepo(String),
+
     #[error("failed to hash password: {0}")]
     Hash(String),
 
@@ -335,6 +396,15 @@ pub enum AdminApiError {
     Repo(#[from] AdminUserRepositoryError),
 }
 
+impl From<AuthzDenied> for AdminApiError {
+    fn from(d: AuthzDenied) -> Self {
+        match d {
+            AuthzDenied::Denied => Self::Forbidden,
+            AuthzDenied::Repo(e) => Self::AuthzRepo(e.to_string()),
+        }
+    }
+}
+
 impl IntoResponse for AdminApiError {
     fn into_response(self) -> Response {
         let (status, message) = match &self {
@@ -347,9 +417,18 @@ impl IntoResponse for AdminApiError {
             | Self::InvalidPassword(_)
             | Self::LastActiveAdmin
             | Self::LastActiveOwner
+            | Self::CannotEscalate
             | Self::Repo(AdminUserRepositoryError::InvalidInstanceRole(_)) => {
                 (StatusCode::UNPROCESSABLE_ENTITY, self.to_string())
             }
+            Self::Forbidden => (StatusCode::FORBIDDEN, self.to_string()),
+            Self::AuthzRepo(e) => {
+                tracing::error!(error = %e, "admin_users authz error");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    "internal error".to_string(),
+                )
+            }
             Self::Repo(AdminUserRepositoryError::NotFound(_)) => {
                 (StatusCode::NOT_FOUND, self.to_string())
             }
diff --git a/crates/manager-core/src/api.rs b/crates/manager-core/src/api.rs
index b949a75..72965bf 100644
--- a/crates/manager-core/src/api.rs
+++ b/crates/manager-core/src/api.rs
@@ -9,14 +9,16 @@ use axum::{
     http::StatusCode,
     response::{IntoResponse, Response},
     routing::get,
-    Json, Router,
+    Extension, Json, Router,
 };
 use picloud_shared::{
-    AppId, ExecutionLog, Script, ScriptId, ScriptSandbox, ScriptValidator, ValidationError,
+    AppId, ExecutionLog, InstanceRole, Principal, Script, ScriptId, ScriptSandbox, ScriptValidator,
+    ValidationError,
 };
 use serde::Deserialize;
 
 use crate::app_repo::AppRepository;
+use crate::authz::{require, AuthzDenied, AuthzRepo, Capability};
 use crate::repo::{
     ExecutionLogRepository, NewScript, ScriptPatch, ScriptRepository, ScriptRepositoryError,
 };
@@ -31,6 +33,10 @@ pub struct AdminState<R, L> {
     /// App lookups: validates `app_id` on create, resolves `?app=<slug>`
     /// filter on list. Trait-object so apps_repo can stay separate.
     pub apps: Arc<dyn AppRepository>,
+    /// Phase 3.5 capability checks — every script handler resolves
+    /// `AppRead/Write/LogRead(script.app_id)` against this repo after
+    /// loading the resource.
+    pub authz: Arc<dyn AuthzRepo>,
     pub validator: Arc<dyn ScriptValidator>,
     pub sandbox_ceiling: SandboxCeiling,
 }
@@ -41,6 +47,7 @@ impl<R, L> Clone for AdminState<R, L> {
             repo: self.repo.clone(),
             logs: self.logs.clone(),
             apps: self.apps.clone(),
+            authz: self.authz.clone(),
             validator: self.validator.clone(),
             sandbox_ceiling: self.sandbox_ceiling,
         }
@@ -129,14 +136,22 @@ where
 
 async fn list_scripts<R: ScriptRepository, L: ExecutionLogRepository>(
     State(state): State<AdminState<R, L>>,
+    Extension(principal): Extension<Principal>,
     Query(q): Query<ListScriptsQuery>,
 ) -> Result<Json<Vec<Script>>, ApiError> {
+    // Membership filter: `member` users see only scripts in apps they
+    // belong to. `?app=` filters further by app and additionally
+    // requires the member to belong to that app (the read check uses
+    // the resource's app_id).
     if let Some(ident) = q.app {
         let app = resolve_app_ident(state.apps.as_ref(), &ident).await?;
-        Ok(Json(state.repo.list_for_app(app).await?))
-    } else {
-        Ok(Json(state.repo.list().await?))
+        require(state.authz.as_ref(), &principal, Capability::AppRead(app)).await?;
+        return Ok(Json(state.repo.list_for_app(app).await?));
     }
+    if principal.instance_role == InstanceRole::Member {
+        return Ok(Json(state.repo.list_for_user(principal.user_id).await?));
+    }
+    Ok(Json(state.repo.list().await?))
 }
 
 /// Accept `?app=<uuid>` OR `?app=<slug>`. Slugs route through history
@@ -159,20 +174,34 @@ async fn resolve_app_ident(apps: &dyn AppRepository, ident: &str) -> Result<AppI
 
 async fn get_script<R: ScriptRepository, L: ExecutionLogRepository>(
     State(state): State<AdminState<R, L>>,
+    Extension(principal): Extension<Principal>,
     Path(id): Path<ScriptId>,
 ) -> Result<Json<Script>, ApiError> {
-    state
-        .repo
-        .get(id)
-        .await?
-        .map(Json)
-        .ok_or(ApiError::NotFound(id))
+    let script = state.repo.get(id).await?.ok_or(ApiError::NotFound(id))?;
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::AppRead(script.app_id),
+    )
+    .await?;
+    Ok(Json(script))
 }
 
 async fn create_script<R: ScriptRepository, L: ExecutionLogRepository>(
     State(state): State<AdminState<R, L>>,
+    Extension(principal): Extension<Principal>,
     Json(input): Json<CreateScriptRequest>,
 ) -> Result<(StatusCode, Json<Script>), ApiError> {
+    // Capability is bound to the *requested* app_id since there's no
+    // resource to load yet. If the app doesn't exist we 422 below;
+    // checking authz first means a Member trying to create against an
+    // unknown app gets 403 (no enumeration of app existence).
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::AppWriteScript(input.app_id),
+    )
+    .await?;
     state.validator.validate(&input.source)?;
     state.sandbox_ceiling.check(&input.sandbox)?;
     // Refuse early if the app_id doesn't exist — a clean 422 beats a
@@ -201,9 +230,17 @@ async fn create_script<R: ScriptRepository, L: ExecutionLogRepository>(
 
 async fn update_script<R: ScriptRepository, L: ExecutionLogRepository>(
     State(state): State<AdminState<R, L>>,
+    Extension(principal): Extension<Principal>,
     Path(id): Path<ScriptId>,
     Json(input): Json<UpdateScriptRequest>,
 ) -> Result<Json<Script>, ApiError> {
+    let script = state.repo.get(id).await?.ok_or(ApiError::NotFound(id))?;
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::AppWriteScript(script.app_id),
+    )
+    .await?;
     if let Some(src) = input.source.as_deref() {
         state.validator.validate(src)?;
     }
@@ -229,8 +266,16 @@ async fn update_script<R: ScriptRepository, L: ExecutionLogRepository>(
 
 async fn delete_script<R: ScriptRepository, L: ExecutionLogRepository>(
     State(state): State<AdminState<R, L>>,
+    Extension(principal): Extension<Principal>,
     Path(id): Path<ScriptId>,
 ) -> Result<StatusCode, ApiError> {
+    let script = state.repo.get(id).await?.ok_or(ApiError::NotFound(id))?;
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::AppWriteScript(script.app_id),
+    )
+    .await?;
     state.repo.delete(id).await?;
     Ok(StatusCode::NO_CONTENT)
 }
@@ -249,9 +294,17 @@ const fn default_limit() -> i64 {
 
 async fn list_logs<R: ScriptRepository, L: ExecutionLogRepository>(
     State(state): State<AdminState<R, L>>,
+    Extension(principal): Extension<Principal>,
     Path(id): Path<ScriptId>,
     axum::extract::Query(q): axum::extract::Query<LogsQuery>,
 ) -> Result<Json<Vec<ExecutionLog>>, ApiError> {
+    let script = state.repo.get(id).await?.ok_or(ApiError::NotFound(id))?;
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::AppLogRead(script.app_id),
+    )
+    .await?;
     // Cap to keep the dashboard responsive; the data plane writes are
     // unbounded over time so a paged read is the only sane default.
     let limit = q.limit.clamp(1, 200);
@@ -281,10 +334,25 @@ pub enum ApiError {
     #[error("{0}")]
     Ceiling(#[from] CeilingError),
 
+    #[error("forbidden")]
+    Forbidden,
+
+    #[error("authorization repo error: {0}")]
+    AuthzRepo(String),
+
     #[error("repository error: {0}")]
     Repo(#[from] ScriptRepositoryError),
 }
 
+impl From<AuthzDenied> for ApiError {
+    fn from(d: AuthzDenied) -> Self {
+        match d {
+            AuthzDenied::Denied => Self::Forbidden,
+            AuthzDenied::Repo(e) => Self::AuthzRepo(e.to_string()),
+        }
+    }
+}
+
 impl IntoResponse for ApiError {
     fn into_response(self) -> Response {
         let (status, message) = match &self {
@@ -294,6 +362,14 @@ impl IntoResponse for ApiError {
             Self::Invalid(_) | Self::Ceiling(_) => {
                 (StatusCode::UNPROCESSABLE_ENTITY, self.to_string())
             }
+            Self::Forbidden => (StatusCode::FORBIDDEN, self.to_string()),
+            Self::AuthzRepo(e) => {
+                tracing::error!(error = %e, "authz repo error");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    "internal error".to_string(),
+                )
+            }
             Self::Repo(ScriptRepositoryError::NotFound(_)) => {
                 (StatusCode::NOT_FOUND, self.to_string())
             }
diff --git a/crates/manager-core/src/app_repo.rs b/crates/manager-core/src/app_repo.rs
index 2589493..152eda9 100644
--- a/crates/manager-core/src/app_repo.rs
+++ b/crates/manager-core/src/app_repo.rs
@@ -6,7 +6,7 @@
 //! that writes the history row in the same transaction.
 
 use async_trait::async_trait;
-use picloud_shared::{App, AppId};
+use picloud_shared::{AdminUserId, App, AppId};
 use sqlx::PgPool;
 
 use crate::repo::ScriptRepositoryError;
@@ -22,7 +22,15 @@ pub struct AppLookup {
 
 #[async_trait]
 pub trait AppRepository: Send + Sync {
+    /// Every app on the instance. For owner/admin callers — `member`
+    /// users go through `list_for_user`.
     async fn list(&self) -> Result<Vec<App>, ScriptRepositoryError>;
+    /// Only apps the user has an `app_members` row for. Drives the
+    /// membership-filtered `GET /admin/apps` for `member` callers.
+    async fn list_for_user(
+        &self,
+        user_id: AdminUserId,
+    ) -> Result<Vec<App>, ScriptRepositoryError>;
     async fn get_by_id(&self, id: AppId) -> Result<Option<App>, ScriptRepositoryError>;
     async fn get_by_slug(&self, slug: &str) -> Result<Option<App>, ScriptRepositoryError>;
     async fn get_by_slug_or_history(
@@ -92,6 +100,23 @@ impl AppRepository for PostgresAppRepository {
         Ok(rows.into_iter().map(Into::into).collect())
     }
 
+    async fn list_for_user(
+        &self,
+        user_id: AdminUserId,
+    ) -> Result<Vec<App>, ScriptRepositoryError> {
+        let rows = sqlx::query_as::<_, AppRow>(
+            "SELECT a.id, a.slug, a.name, a.description, a.created_at, a.updated_at \
+             FROM apps a \
+             JOIN app_members m ON m.app_id = a.id \
+             WHERE m.user_id = $1 \
+             ORDER BY a.name",
+        )
+        .bind(user_id.into_inner())
+        .fetch_all(&self.pool)
+        .await?;
+        Ok(rows.into_iter().map(Into::into).collect())
+    }
+
     async fn get_by_id(&self, id: AppId) -> Result<Option<App>, ScriptRepositoryError> {
         let row = sqlx::query_as::<_, AppRow>(
             "SELECT id, slug, name, description, created_at, updated_at \
diff --git a/crates/manager-core/src/apps_api.rs b/crates/manager-core/src/apps_api.rs
index eec0a0d..7204ac6 100644
--- a/crates/manager-core/src/apps_api.rs
+++ b/crates/manager-core/src/apps_api.rs
@@ -15,15 +15,16 @@ use axum::extract::{Path, Query, State};
 use axum::http::StatusCode;
 use axum::response::{IntoResponse, Json, Response};
 use axum::routing::{delete, get, post};
-use axum::Router;
+use axum::{Extension, Router};
 use picloud_orchestrator_core::routing::{pattern, AppDomainTable, CompiledAppDomain};
-use picloud_shared::{App, AppDomain, AppId};
+use picloud_shared::{App, AppDomain, AppId, InstanceRole, Principal};
 use serde::{Deserialize, Serialize};
 use serde_json::json;
 use uuid::Uuid;
 
 use crate::app_domain_repo::{AppDomainRepository, NewAppDomain};
 use crate::app_repo::AppRepository;
+use crate::authz::{require, AuthzDenied, AuthzRepo, Capability};
 use crate::repo::ScriptRepositoryError;
 use crate::route_repo::RouteRepository;
 
@@ -41,6 +42,8 @@ pub struct AppsState {
     /// Cached host → app_id lookup; replaced after every domain CRUD
     /// operation so the orchestrator sees changes immediately.
     pub domain_table: Arc<AppDomainTable>,
+    /// Capability gate — Phase 3.5.
+    pub authz: Arc<dyn AuthzRepo>,
 }
 
 pub fn apps_router(state: AppsState) -> Router {
@@ -144,14 +147,27 @@ pub struct AppLookupResponse {
 // Handlers
 // ----------------------------------------------------------------------------
 
-async fn list_apps(State(s): State<AppsState>) -> Result<Json<Vec<App>>, AppsApiError> {
-    Ok(Json(s.apps.list().await?))
+async fn list_apps(
+    State(s): State<AppsState>,
+    Extension(principal): Extension<Principal>,
+) -> Result<Json<Vec<App>>, AppsApiError> {
+    // Member callers see only apps they're a member of; owner/admin
+    // see everything. Filter at the SQL layer (not just in the
+    // dashboard) — that's the strict-isolation guarantee from §11.6.
+    let apps = if principal.instance_role == InstanceRole::Member {
+        s.apps.list_for_user(principal.user_id).await?
+    } else {
+        s.apps.list().await?
+    };
+    Ok(Json(apps))
 }
 
 async fn create_app(
     State(s): State<AppsState>,
+    Extension(principal): Extension<Principal>,
     Json(input): Json<CreateAppRequest>,
 ) -> Result<(StatusCode, Json<App>), AppsApiError> {
+    require(s.authz.as_ref(), &principal, Capability::InstanceCreateApp).await?;
     validate_slug(&input.slug)?;
 
     // Historical-slug check before insert: if the slug is in history
@@ -178,9 +194,16 @@ async fn create_app(
 
 async fn get_app(
     State(s): State<AppsState>,
+    Extension(principal): Extension<Principal>,
     Path(id_or_slug): Path<String>,
 ) -> Result<Json<AppLookupResponse>, AppsApiError> {
     let lookup = resolve_app(&*s.apps, &id_or_slug).await?;
+    require(
+        s.authz.as_ref(),
+        &principal,
+        Capability::AppRead(lookup.app.id),
+    )
+    .await?;
     let redirect_to = if lookup.redirected {
         Some(lookup.app.slug.clone())
     } else {
@@ -194,10 +217,17 @@ async fn get_app(
 
 async fn patch_app(
     State(s): State<AppsState>,
+    Extension(principal): Extension<Principal>,
     Path(id_or_slug): Path<String>,
     Json(input): Json<PatchAppRequest>,
 ) -> Result<Json<App>, AppsApiError> {
     let current = resolve_app(&*s.apps, &id_or_slug).await?.app;
+    require(
+        s.authz.as_ref(),
+        &principal,
+        Capability::AppAdmin(current.id),
+    )
+    .await?;
 
     // Edits to name/description go first (separate from rename so we
     // don't conflate the two errors).
@@ -240,10 +270,12 @@ async fn patch_app(
 
 async fn delete_app(
     State(s): State<AppsState>,
+    Extension(principal): Extension<Principal>,
     Path(id_or_slug): Path<String>,
     Query(q): Query<DeleteAppQuery>,
 ) -> Result<StatusCode, AppsApiError> {
     let app = resolve_app(&*s.apps, &id_or_slug).await?.app;
+    require(s.authz.as_ref(), &principal, Capability::AppAdmin(app.id)).await?;
 
     if q.force {
         s.apps.delete_cascade(app.id).await?;
@@ -262,9 +294,12 @@ async fn delete_app(
 
 async fn slug_check(
     State(s): State<AppsState>,
-    Path(_id_or_slug): Path<String>,
+    Extension(principal): Extension<Principal>,
+    Path(id_or_slug): Path<String>,
     Json(input): Json<SlugCheckRequest>,
 ) -> Result<Json<SlugCheckResponse>, AppsApiError> {
+    let app = resolve_app(&*s.apps, &id_or_slug).await?.app;
+    require(s.authz.as_ref(), &principal, Capability::AppAdmin(app.id)).await?;
     match validate_slug(&input.new_slug) {
         Err(AppsApiError::InvalidSlug(reason)) => {
             return Ok(Json(SlugCheckResponse {
@@ -303,18 +338,27 @@ async fn slug_check(
 
 async fn list_domains(
     State(s): State<AppsState>,
+    Extension(principal): Extension<Principal>,
     Path(id_or_slug): Path<String>,
 ) -> Result<Json<Vec<AppDomain>>, AppsApiError> {
     let app = resolve_app(&*s.apps, &id_or_slug).await?.app;
+    require(s.authz.as_ref(), &principal, Capability::AppRead(app.id)).await?;
     Ok(Json(s.domains.list_for_app(app.id).await?))
 }
 
 async fn create_domain(
     State(s): State<AppsState>,
+    Extension(principal): Extension<Principal>,
     Path(id_or_slug): Path<String>,
     Json(input): Json<CreateDomainRequest>,
 ) -> Result<(StatusCode, Json<AppDomain>), AppsApiError> {
     let app = resolve_app(&*s.apps, &id_or_slug).await?.app;
+    require(
+        s.authz.as_ref(),
+        &principal,
+        Capability::AppManageDomains(app.id),
+    )
+    .await?;
     let parsed = pattern::parse_app_domain(&input.pattern)?;
     let created = s
         .domains
@@ -331,9 +375,16 @@ async fn create_domain(
 
 async fn delete_domain(
     State(s): State<AppsState>,
+    Extension(principal): Extension<Principal>,
     Path((id_or_slug, domain_id)): Path<(String, Uuid)>,
 ) -> Result<StatusCode, AppsApiError> {
     let app = resolve_app(&*s.apps, &id_or_slug).await?.app;
+    require(
+        s.authz.as_ref(),
+        &principal,
+        Capability::AppManageDomains(app.id),
+    )
+    .await?;
     let Some(domain) = s.domains.get(domain_id).await? else {
         return Err(AppsApiError::DomainNotFound(domain_id));
     };
@@ -476,10 +527,25 @@ pub enum AppsApiError {
     #[error("conflict: {0}")]
     Conflict(String),
 
+    #[error("forbidden")]
+    Forbidden,
+
+    #[error("authorization repo error: {0}")]
+    AuthzRepo(String),
+
     #[error("repository error: {0}")]
     Repo(#[from] ScriptRepositoryError),
 }
 
+impl From<AuthzDenied> for AppsApiError {
+    fn from(d: AuthzDenied) -> Self {
+        match d {
+            AuthzDenied::Denied => Self::Forbidden,
+            AuthzDenied::Repo(e) => Self::AuthzRepo(e.to_string()),
+        }
+    }
+}
+
 impl IntoResponse for AppsApiError {
     fn into_response(self) -> Response {
         let (status, body) = match &self {
@@ -511,6 +577,14 @@ impl IntoResponse for AppsApiError {
             Self::Conflict(_) | Self::Repo(ScriptRepositoryError::Conflict(_)) => {
                 (StatusCode::CONFLICT, json!({ "error": self.to_string() }))
             }
+            Self::Forbidden => (StatusCode::FORBIDDEN, json!({ "error": self.to_string() })),
+            Self::AuthzRepo(e) => {
+                tracing::error!(error = %e, "apps authz repo error");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    json!({ "error": "internal error" }),
+                )
+            }
             Self::Repo(ScriptRepositoryError::Db(e)) => {
                 tracing::error!(error = %e, "apps api db error");
                 (
diff --git a/crates/manager-core/src/repo.rs b/crates/manager-core/src/repo.rs
index bc01119..a699ddc 100644
--- a/crates/manager-core/src/repo.rs
+++ b/crates/manager-core/src/repo.rs
@@ -3,7 +3,7 @@ use std::collections::BTreeMap;
 use async_trait::async_trait;
 use picloud_orchestrator_core::{ResolverError, ScriptResolver};
 use picloud_shared::{
-    AppId, ExecutionLog, ExecutionStatus, RequestId, Script, ScriptId, ScriptSandbox,
+    AdminUserId, AppId, ExecutionLog, ExecutionStatus, RequestId, Script, ScriptId, ScriptSandbox,
 };
 use sqlx::PgPool;
 
@@ -27,6 +27,14 @@ pub trait ScriptRepository: Send + Sync {
     /// "global" views; the dashboard reaches scripts via `list_for_app`.
     async fn list(&self) -> Result<Vec<Script>, ScriptRepositoryError>;
     async fn list_for_app(&self, app_id: AppId) -> Result<Vec<Script>, ScriptRepositoryError>;
+    /// Every script in any app the user is a member of. Drives
+    /// `GET /admin/scripts` for `member` instance-role callers so the
+    /// API never returns scripts they shouldn't see — even before the
+    /// per-handler capability check fires.
+    async fn list_for_user(
+        &self,
+        user_id: AdminUserId,
+    ) -> Result<Vec<Script>, ScriptRepositoryError>;
     async fn create(&self, input: NewScript) -> Result<Script, ScriptRepositoryError>;
     async fn update(
         &self,
@@ -117,6 +125,24 @@ impl ScriptRepository for PostgresScriptRepository {
         Ok(rows.into_iter().map(Into::into).collect())
     }
 
+    async fn list_for_user(
+        &self,
+        user_id: AdminUserId,
+    ) -> Result<Vec<Script>, ScriptRepositoryError> {
+        let rows = sqlx::query_as::<_, ScriptRow>(
+            "SELECT s.id, s.app_id, s.name, s.description, s.version, s.source, \
+                    s.timeout_seconds, s.memory_limit_mb, s.sandbox, s.created_at, s.updated_at \
+             FROM scripts s \
+             JOIN app_members m ON m.app_id = s.app_id \
+             WHERE m.user_id = $1 \
+             ORDER BY s.name",
+        )
+        .bind(user_id.into_inner())
+        .fetch_all(&self.pool)
+        .await?;
+        Ok(rows.into_iter().map(Into::into).collect())
+    }
+
     async fn create(&self, input: NewScript) -> Result<Script, ScriptRepositoryError> {
         let sandbox_json = serde_json::to_value(input.sandbox.unwrap_or_default())
             .unwrap_or_else(|_| serde_json::json!({}));
diff --git a/crates/manager-core/src/route_admin.rs b/crates/manager-core/src/route_admin.rs
index f21317f..240ab67 100644
--- a/crates/manager-core/src/route_admin.rs
+++ b/crates/manager-core/src/route_admin.rs
@@ -10,14 +10,15 @@ use axum::{
     http::StatusCode,
     response::{IntoResponse, Response},
     routing::{delete, get, post},
-    Json, Router,
+    Extension, Json, Router,
 };
 use picloud_orchestrator_core::routing::{conflict, matcher::CompiledRoute, pattern, RouteTable};
-use picloud_shared::{AppId, HostKind, PathKind, Route, ScriptId};
+use picloud_shared::{AppId, HostKind, PathKind, Principal, Route, ScriptId};
 use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
 use crate::app_domain_repo::AppDomainRepository;
+use crate::authz::{require, AuthzDenied, AuthzRepo, Capability};
 use crate::repo::{ScriptRepository, ScriptRepositoryError};
 use crate::route_repo::{NewRoute, RouteRepository};
 
@@ -30,6 +31,8 @@ pub struct RouteAdminState<RR, SR> {
     /// declared domain claims.
     pub domains: Arc<dyn AppDomainRepository>,
     pub table: Arc<RouteTable>,
+    /// Capability gate — Phase 3.5.
+    pub authz: Arc<dyn AuthzRepo>,
 }
 
 impl<RR, SR> Clone for RouteAdminState<RR, SR> {
@@ -39,6 +42,7 @@ impl<RR, SR> Clone for RouteAdminState<RR, SR> {
             scripts: self.scripts.clone(),
             domains: self.domains.clone(),
             table: self.table.clone(),
+            authz: self.authz.clone(),
         }
     }
 }
@@ -130,13 +134,26 @@ pub struct MatchedRoute {
 
 async fn list_routes<RR: RouteRepository, SR: ScriptRepository>(
     State(state): State<RouteAdminState<RR, SR>>,
+    Extension(principal): Extension<Principal>,
     Path(script_id): Path<ScriptId>,
 ) -> Result<Json<Vec<Route>>, RouteApiError> {
+    let script = state
+        .scripts
+        .get(script_id)
+        .await?
+        .ok_or(RouteApiError::ScriptNotFound(script_id))?;
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::AppRead(script.app_id),
+    )
+    .await?;
     Ok(Json(state.routes.list_for_script(script_id).await?))
 }
 
 async fn create_route<RR: RouteRepository, SR: ScriptRepository>(
     State(state): State<RouteAdminState<RR, SR>>,
+    Extension(principal): Extension<Principal>,
     Path(script_id): Path<ScriptId>,
     Json(input): Json<CreateRouteRequest>,
 ) -> Result<(StatusCode, Json<Route>), RouteApiError> {
@@ -154,6 +171,12 @@ async fn create_route<RR: RouteRepository, SR: ScriptRepository>(
         .await?
         .ok_or(RouteApiError::ScriptNotFound(script_id))?;
     let app_id = script.app_id;
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::AppWriteRoute(app_id),
+    )
+    .await?;
 
     // Validate the route's host is consistent with one of the app's
     // domain claims. `HostKind::Any` is always permitted (catches every
@@ -196,8 +219,22 @@ async fn create_route<RR: RouteRepository, SR: ScriptRepository>(
 
 async fn delete_route<RR: RouteRepository, SR: ScriptRepository>(
     State(state): State<RouteAdminState<RR, SR>>,
+    Extension(principal): Extension<Principal>,
     Path(route_id): Path<Uuid>,
 ) -> Result<StatusCode, RouteApiError> {
+    // Resolve the route's app before we delete, so the capability
+    // binds to the actual route's app_id (not a path param).
+    let route = state
+        .routes
+        .get(route_id)
+        .await?
+        .ok_or(RouteApiError::RouteNotFound(route_id))?;
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::AppWriteRoute(route.app_id),
+    )
+    .await?;
     state.routes.delete(route_id).await?;
     refresh_table(&state).await?;
     Ok(StatusCode::NO_CONTENT)
@@ -205,8 +242,18 @@ async fn delete_route<RR: RouteRepository, SR: ScriptRepository>(
 
 async fn check_route<RR: RouteRepository, SR: ScriptRepository>(
     State(state): State<RouteAdminState<RR, SR>>,
+    Extension(principal): Extension<Principal>,
     Json(input): Json<CheckRouteRequest>,
 ) -> Result<Json<CheckRouteResponse>, RouteApiError> {
+    // routes:check is read-only — peeking at a hypothetical conflict
+    // is bounded by AppRead on the target app (otherwise members
+    // could probe other apps).
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::AppRead(input.app_id),
+    )
+    .await?;
     let normalized_path = parse_and_normalize_path(input.path_kind, &input.path)?;
     pattern::parse_host(input.host_kind, &input.host, None)?;
 
@@ -235,8 +282,15 @@ async fn check_route<RR: RouteRepository, SR: ScriptRepository>(
 
 async fn match_route<RR: RouteRepository, SR: ScriptRepository>(
     State(state): State<RouteAdminState<RR, SR>>,
+    Extension(principal): Extension<Principal>,
     Json(input): Json<MatchRouteRequest>,
 ) -> Result<Json<MatchRouteResponse>, RouteApiError> {
+    require(
+        state.authz.as_ref(),
+        &principal,
+        Capability::AppRead(input.app_id),
+    )
+    .await?;
     let parsed = url::Url::parse(&input.url)
         .map_err(|e| RouteApiError::BadRequest(format!("invalid url: {e}")))?;
     let host = parsed.host_str().unwrap_or("").to_string();
@@ -415,16 +469,34 @@ pub enum RouteApiError {
     #[error("script not found: {0}")]
     ScriptNotFound(ScriptId),
 
+    #[error("route not found: {0}")]
+    RouteNotFound(Uuid),
+
     #[error("host {host:?} is not claimed by this app")]
     HostNotClaimed {
         host: String,
         available_claims: Vec<String>,
     },
 
+    #[error("forbidden")]
+    Forbidden,
+
+    #[error("authorization repo error: {0}")]
+    AuthzRepo(String),
+
     #[error("repository error: {0}")]
     Repo(#[from] ScriptRepositoryError),
 }
 
+impl From<AuthzDenied> for RouteApiError {
+    fn from(d: AuthzDenied) -> Self {
+        match d {
+            AuthzDenied::Denied => Self::Forbidden,
+            AuthzDenied::Repo(e) => Self::AuthzRepo(e.to_string()),
+        }
+    }
+}
+
 impl IntoResponse for RouteApiError {
     fn into_response(self) -> Response {
         let (status, body) = match &self {
@@ -443,10 +515,23 @@ impl IntoResponse for RouteApiError {
                 StatusCode::UNPROCESSABLE_ENTITY,
                 serde_json::json!({ "error": self.to_string() }),
             ),
-            Self::ScriptNotFound(_) | Self::Repo(ScriptRepositoryError::NotFound(_)) => (
+            Self::ScriptNotFound(_)
+            | Self::RouteNotFound(_)
+            | Self::Repo(ScriptRepositoryError::NotFound(_)) => (
                 StatusCode::NOT_FOUND,
                 serde_json::json!({ "error": self.to_string() }),
             ),
+            Self::Forbidden => (
+                StatusCode::FORBIDDEN,
+                serde_json::json!({ "error": self.to_string() }),
+            ),
+            Self::AuthzRepo(e) => {
+                tracing::error!(error = %e, "route authz repo error");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    serde_json::json!({ "error": "internal error" }),
+                )
+            }
             Self::HostNotClaimed {
                 host,
                 available_claims,
diff --git a/crates/manager-core/src/route_repo.rs b/crates/manager-core/src/route_repo.rs
index 1a4fc79..b914478 100644
--- a/crates/manager-core/src/route_repo.rs
+++ b/crates/manager-core/src/route_repo.rs
@@ -25,6 +25,10 @@ pub struct NewRoute {
 #[async_trait]
 pub trait RouteRepository: Send + Sync {
     async fn list_all(&self) -> Result<Vec<Route>, ScriptRepositoryError>;
+    /// Single-row lookup. Used by `DELETE /api/v1/admin/routes/{id}` so
+    /// the capability check binds to the route's actual `app_id`
+    /// (not a path param).
+    async fn get(&self, route_id: Uuid) -> Result<Option<Route>, ScriptRepositoryError>;
     async fn list_for_app(&self, app_id: AppId) -> Result<Vec<Route>, ScriptRepositoryError>;
     async fn list_for_script(
         &self,
@@ -66,6 +70,18 @@ impl RouteRepository for PostgresRouteRepository {
         Ok(rows.into_iter().map(Into::into).collect())
     }
 
+    async fn get(&self, route_id: Uuid) -> Result<Option<Route>, ScriptRepositoryError> {
+        let row = sqlx::query_as::<_, RouteRow>(
+            "SELECT id, app_id, script_id, host_kind, host, host_param_name, \
+                    path_kind, path, method, created_at \
+             FROM routes WHERE id = $1",
+        )
+        .bind(route_id)
+        .fetch_optional(&self.pool)
+        .await?;
+        Ok(row.map(Into::into))
+    }
+
     async fn list_for_app(&self, app_id: AppId) -> Result<Vec<Route>, ScriptRepositoryError> {
         let rows = sqlx::query_as::<_, RouteRow>(
             "SELECT id, app_id, script_id, host_kind, host, host_param_name, \
diff --git a/crates/picloud/src/lib.rs b/crates/picloud/src/lib.rs
index b0f551b..3bf929d 100644
--- a/crates/picloud/src/lib.rs
+++ b/crates/picloud/src/lib.rs
@@ -12,12 +12,12 @@ use picloud_executor_core::{Engine, Limits};
 use picloud_manager_core::{
     admin_router, admins_router, api_keys_router, apps_api, apps_router, auth_router,
     compile_routes, migrations, require_authenticated, route_admin_router, AdminSessionRepository,
-    AdminState, AdminUserRepository, AdminsState, ApiKeyRepository, ApiKeysState,
-    AppDomainRepository, AppRepository, AppsState, AuthState, PostgresAdminSessionRepository,
+    AdminState, AdminUserRepository, AdminsState, ApiKeyRepository, ApiKeysState, AppDomainRepository,
+    AppRepository, AppsState, AuthState, AuthzRepo, PostgresAdminSessionRepository,
     PostgresAdminUserRepository, PostgresApiKeyRepository, PostgresAppDomainRepository,
-    PostgresAppRepository, PostgresExecutionLogRepository, PostgresExecutionLogSink,
-    PostgresRouteRepository, PostgresScriptRepository, RepoResolver, RouteAdminState,
-    RouteRepository, SandboxCeiling,
+    PostgresAppMembersRepository, PostgresAppRepository, PostgresExecutionLogRepository,
+    PostgresExecutionLogSink, PostgresRouteRepository, PostgresScriptRepository, RepoResolver,
+    RouteAdminState, RouteRepository, SandboxCeiling,
 };
 use picloud_orchestrator_core::routing::{AppDomainTable, RouteTable};
 use picloud_orchestrator_core::{
@@ -88,7 +88,10 @@ pub async fn build_app(pool: PgPool, auth: AuthDeps) -> anyhow::Result<Router> {
     let route_repo = Arc::new(PostgresRouteRepository::new(pool.clone()));
     let apps_repo: Arc<dyn AppRepository> = Arc::new(PostgresAppRepository::new(pool.clone()));
     let domains_repo: Arc<dyn AppDomainRepository> =
-        Arc::new(PostgresAppDomainRepository::new(pool));
+        Arc::new(PostgresAppDomainRepository::new(pool.clone()));
+    // Authz: app_members repo doubles as the AuthzRepo impl for the
+    // per-handler capability checks introduced in Phase 3.5.
+    let authz: Arc<dyn AuthzRepo> = Arc::new(PostgresAppMembersRepository::new(pool));
 
     // Compile the routes table once at startup; admin writes refresh it.
     let route_table = Arc::new(RouteTable::new());
@@ -123,6 +126,7 @@ pub async fn build_app(pool: PgPool, auth: AuthDeps) -> anyhow::Result<Router> {
         repo: Arc::new(PostgresScriptRepoHandle(script_repo.clone())),
         logs: log_repo,
         apps: apps_repo.clone(),
+        authz: authz.clone(),
         validator: engine as Arc<dyn ScriptValidator>,
         sandbox_ceiling: SandboxCeiling::from_env(),
     };
@@ -131,6 +135,7 @@ pub async fn build_app(pool: PgPool, auth: AuthDeps) -> anyhow::Result<Router> {
         scripts: Arc::new(PostgresScriptRepoHandle(script_repo)),
         domains: domains_repo.clone(),
         table: route_table.clone(),
+        authz: authz.clone(),
     };
     let data_plane = DataPlaneState {
         executor,
@@ -144,6 +149,7 @@ pub async fn build_app(pool: PgPool, auth: AuthDeps) -> anyhow::Result<Router> {
         domains: domains_repo,
         routes: route_repo,
         domain_table: app_domain_table,
+        authz: authz.clone(),
     };
 
     let auth_state = AuthState {
@@ -156,6 +162,7 @@ pub async fn build_app(pool: PgPool, auth: AuthDeps) -> anyhow::Result<Router> {
         users: auth.users,
         sessions: auth.sessions,
         keys: auth.keys.clone(),
+        authz,
     };
     let api_keys_state = ApiKeysState {
         keys: auth.keys,
@@ -258,6 +265,12 @@ impl picloud_manager_core::ScriptRepository for PostgresScriptRepoHandle {
     ) -> Result<Vec<picloud_shared::Script>, picloud_manager_core::ScriptRepositoryError> {
         self.0.list_for_app(app_id).await
     }
+    async fn list_for_user(
+        &self,
+        user_id: picloud_shared::AdminUserId,
+    ) -> Result<Vec<picloud_shared::Script>, picloud_manager_core::ScriptRepositoryError> {
+        self.0.list_for_user(user_id).await
+    }
     async fn create(
         &self,
         input: picloud_manager_core::NewScript,