diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index 5e985da92b..5876743504 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -2859,6 +2859,7 @@ dependencies = [
  "thiserror 2.0.18",
  "tokio",
  "url",
+ "wiremock",
 ]
 
 [[package]]
diff --git a/codex-rs/core/src/tools/handlers/dependency_check.rs b/codex-rs/core/src/tools/handlers/dependency_check.rs
index 96c57d2612..1921498d9d 100644
--- a/codex-rs/core/src/tools/handlers/dependency_check.rs
+++ b/codex-rs/core/src/tools/handlers/dependency_check.rs
@@ -435,11 +435,7 @@ impl DependencyCommandRunner {
                 .additional_permissions_preapproved,
             justification: Some(justification.to_string()),
             exec_approval_requirement,
-            approval_review_mode: match working_directory_access {
-                WorkingDirectoryAccess::ProjectDependencyFiles => ApprovalReviewMode::User,
-                WorkingDirectoryAccess::Default
-                | WorkingDirectoryAccess::PreapprovedScratch => ApprovalReviewMode::Configured,
-            },
+            approval_review_mode: approval_review_mode(working_directory_access),
         };
         let tool_ctx = ToolCtx {
             session: self.session.clone(),
@@ -448,8 +444,7 @@ impl DependencyCommandRunner {
             tool_name: self.tool_name.clone(),
         };
         let mut orchestrator = ToolOrchestrator::new();
-        let mut runtime =
-            ShellRuntime::for_shell_command(ShellRuntimeBackend::ShellCommandClassic);
+        let mut runtime = ShellRuntime::for_shell_command(ShellRuntimeBackend::ShellCommandClassic);
         orchestrator
             .run(
                 &mut runtime,
@@ -468,6 +463,15 @@ impl DependencyCommandRunner {
     }
 }
 
+fn approval_review_mode(working_directory_access: WorkingDirectoryAccess) -> ApprovalReviewMode {
+    match working_directory_access {
+        WorkingDirectoryAccess::ProjectDependencyFiles => ApprovalReviewMode::User,
+        WorkingDirectoryAccess::Default | WorkingDirectoryAccess::PreapprovedScratch => {
+            ApprovalReviewMode::Configured
+        }
+    }
+}
+
 fn command_permissions(
     cwd: &Path,
     working_directory_access: WorkingDirectoryAccess,
@@ -580,6 +584,22 @@ async fn copy_resolution_inputs(
 mod tests {
     use super::*;
 
+    fn write_permissions(paths: Vec<AbsolutePathBuf>) -> AdditionalPermissionProfile {
+        AdditionalPermissionProfile {
+            file_system: Some(FileSystemPermissions {
+                entries: paths
+                    .into_iter()
+                    .map(|path| FileSystemSandboxEntry {
+                        path: FileSystemPath::Path { path },
+                        access: FileSystemAccessMode::Write,
+                    })
+                    .collect(),
+                glob_scan_max_depth: None,
+            }),
+            ..Default::default()
+        }
+    }
+
     #[test]
     fn raw_install_redirect_names_package_manager() {
         let message = dependency_install_redirect(&[
@@ -607,16 +627,9 @@ mod tests {
         assert!(permissions.additional_permissions_preapproved);
         assert_eq!(
             permissions.additional_permissions,
-            Some(PermissionProfile {
-                file_system: Some(FileSystemPermissions {
-                    read: None,
-                    write: Some(vec![
-                        AbsolutePathBuf::from_absolute_path(scratch.path())
-                            .expect("absolute scratch path")
-                    ]),
-                }),
-                ..Default::default()
-            })
+            Some(write_permissions(vec![
+                AbsolutePathBuf::from_absolute_path(scratch.path()).expect("absolute scratch path")
+            ]))
         );
     }
 
@@ -637,20 +650,16 @@ mod tests {
         assert!(!permissions.additional_permissions_preapproved);
         assert_eq!(
             permissions.additional_permissions,
-            Some(PermissionProfile {
-                file_system: Some(FileSystemPermissions {
-                    read: None,
-                    write: Some(vec![
-                        AbsolutePathBuf::from_absolute_path(project.path().join("package.json"))
-                            .expect("absolute package.json path"),
-                        AbsolutePathBuf::from_absolute_path(
-                            project.path().join("package-lock.json")
-                        )
-                        .expect("absolute package-lock.json path"),
-                    ]),
-                }),
-                ..Default::default()
-            })
+            Some(write_permissions(vec![
+                AbsolutePathBuf::from_absolute_path(project.path().join("package.json"))
+                    .expect("absolute package.json path"),
+                AbsolutePathBuf::from_absolute_path(project.path().join("package-lock.json"))
+                    .expect("absolute package-lock.json path"),
+            ]))
+        );
+        assert_eq!(
+            approval_review_mode(WorkingDirectoryAccess::ProjectDependencyFiles),
+            ApprovalReviewMode::User
         );
     }
 }
diff --git a/codex-rs/core/src/tools/handlers/dependency_check_output.rs b/codex-rs/core/src/tools/handlers/dependency_check_output.rs
index 3d351476d2..b627d0313b 100644
--- a/codex-rs/core/src/tools/handlers/dependency_check_output.rs
+++ b/codex-rs/core/src/tools/handlers/dependency_check_output.rs
@@ -1,4 +1,3 @@
-use codex_protocol::exec_output::ExecToolCallOutput;
 use crate::tools::context::FunctionToolOutput;
 use codex_dependency_check::DependencyCheckRequest;
 use codex_dependency_check::DependencyPolicyAction;
@@ -7,6 +6,7 @@ use codex_dependency_check::DependencyRisk;
 use codex_dependency_check::DependencyRiskKind;
 use codex_dependency_check::NpmGraphMismatch;
 use codex_dependency_check::NpmInstalledGraphMismatch;
+use codex_protocol::exec_output::ExecToolCallOutput;
 
 pub(super) fn blocked_output(message: String) -> FunctionToolOutput {
     FunctionToolOutput::from_text(message, Some(false))
diff --git a/codex-rs/core/src/tools/handlers/dependency_guard.rs b/codex-rs/core/src/tools/handlers/dependency_guard.rs
index 5fd16cf2f9..a197acfc71 100644
--- a/codex-rs/core/src/tools/handlers/dependency_guard.rs
+++ b/codex-rs/core/src/tools/handlers/dependency_guard.rs
@@ -87,7 +87,7 @@ mod tests {
 
         assert!(dependency_permissions_overlap_project(
             SandboxPermissions::RequireEscalated,
-            None,
+            /*additional_permissions*/ None,
             &root,
         ));
         assert!(dependency_permissions_overlap_project(
@@ -101,8 +101,8 @@ mod tests {
     fn permits_unrelated_write_permissions() {
         let root = AbsolutePathBuf::from_absolute_path("/workspace/project")
             .expect("absolute project root");
-        let cache = AbsolutePathBuf::from_absolute_path("/var/cache/example")
-            .expect("absolute cache path");
+        let cache =
+            AbsolutePathBuf::from_absolute_path("/var/cache/example").expect("absolute cache path");
         let profile = write_profile(FileSystemPath::Path { path: cache });
 
         assert_eq!(
diff --git a/codex-rs/core/src/tools/handlers/request_permissions.rs b/codex-rs/core/src/tools/handlers/request_permissions.rs
index 3d7afc6b30..e2bf016a04 100644
--- a/codex-rs/core/src/tools/handlers/request_permissions.rs
+++ b/codex-rs/core/src/tools/handlers/request_permissions.rs
@@ -6,11 +6,11 @@ use crate::tools::context::FunctionToolOutput;
 use crate::tools::context::ToolInvocation;
 use crate::tools::context::ToolPayload;
 use crate::tools::context::boxed_tool_output;
+use crate::tools::handlers::dependency_guard::dependency_permission_request_message;
+use crate::tools::handlers::dependency_guard::dependency_permissions_overlap_project;
 use crate::tools::handlers::parse_arguments;
 use crate::tools::handlers::parse_arguments_with_base_path;
 use crate::tools::handlers::resolve_tool_environment;
-use crate::tools::handlers::dependency_guard::dependency_permission_request_message;
-use crate::tools::handlers::dependency_guard::dependency_permissions_overlap_project;
 use crate::tools::handlers::shell_spec::create_request_permissions_tool;
 use crate::tools::handlers::shell_spec::request_permissions_tool_description;
 use crate::tools::registry::CoreToolRuntime;
@@ -93,7 +93,10 @@ impl RequestPermissionsHandler {
                 "request_permissions requires at least one permission".to_string(),
             ));
         }
-        if session.features().enabled(codex_features::Feature::DependencyCheck) {
+        if session
+            .features()
+            .enabled(codex_features::Feature::DependencyCheck)
+        {
             let permissions: codex_protocol::models::AdditionalPermissionProfile =
                 args.permissions.clone().into();
             if dependency_permissions_overlap_project(
diff --git a/codex-rs/core/src/tools/handlers/shell.rs b/codex-rs/core/src/tools/handlers/shell.rs
index 191ab1d38c..3e14f05f85 100644
--- a/codex-rs/core/src/tools/handlers/shell.rs
+++ b/codex-rs/core/src/tools/handlers/shell.rs
@@ -26,8 +26,8 @@ use crate::tools::orchestrator::ToolOrchestrator;
 use crate::tools::runtimes::shell::ShellRequest;
 use crate::tools::runtimes::shell::ShellRuntime;
 use crate::tools::runtimes::shell::ShellRuntimeBackend;
-use crate::tools::sandboxing::ToolCtx;
 use crate::tools::sandboxing::ApprovalReviewMode;
+use crate::tools::sandboxing::ToolCtx;
 use codex_protocol::models::AdditionalPermissionProfile;
 use codex_protocol::protocol::ExecCommandSource;
 use codex_tools::ToolName;
@@ -129,11 +129,15 @@ async fn run_exec_like(args: RunExecLikeArgs) -> Result<FunctionToolOutput, Func
     )
     .map_err(FunctionCallError::RespondToModel)?;
 
+    let dependency_project_root = turn_environment
+        .cwd()
+        .to_abs_path()
+        .unwrap_or_else(|_| exec_params.cwd.clone());
     if session.features().enabled(Feature::DependencyCheck)
         && dependency_permissions_overlap_project(
             effective_additional_permissions.sandbox_permissions,
             normalized_additional_permissions.as_ref(),
-            &exec_params.cwd,
+            &dependency_project_root,
         )
     {
         return Err(FunctionCallError::RespondToModel(
diff --git a/codex-rs/core/src/tools/handlers/unified_exec/exec_command.rs b/codex-rs/core/src/tools/handlers/unified_exec/exec_command.rs
index c137d63fa1..6b484a0fe9 100644
--- a/codex-rs/core/src/tools/handlers/unified_exec/exec_command.rs
+++ b/codex-rs/core/src/tools/handlers/unified_exec/exec_command.rs
@@ -332,11 +332,15 @@ impl ExecCommandHandler {
             }
         };
 
+        let dependency_project_root = turn_environment
+            .cwd()
+            .to_abs_path()
+            .unwrap_or_else(|_| turn.config.cwd.clone());
         if session.features().enabled(Feature::DependencyCheck)
             && dependency_permissions_overlap_project(
                 effective_additional_permissions.sandbox_permissions,
                 normalized_additional_permissions.as_ref(),
-                permission_cwd,
+                &dependency_project_root,
             )
         {
             manager.release_process_id(process_id).await;
diff --git a/codex-rs/core/src/tools/orchestrator.rs b/codex-rs/core/src/tools/orchestrator.rs
index 746b13290e..3ab9f494d3 100644
--- a/codex-rs/core/src/tools/orchestrator.rs
+++ b/codex-rs/core/src/tools/orchestrator.rs
@@ -157,8 +157,11 @@ impl ToolOrchestrator {
         let otel_ci = &tool_ctx.call_id;
         let strict_auto_review = tool_ctx.session.strict_auto_review_enabled_for_turn().await;
         let force_user_review = tool.approval_review_mode(req) == ApprovalReviewMode::User;
-        let use_guardian =
-            !force_user_review && (routes_approval_to_guardian(turn_ctx) || strict_auto_review);
+        let use_guardian = use_guardian_for_review_mode(
+            routes_approval_to_guardian(turn_ctx),
+            strict_auto_review,
+            tool.approval_review_mode(req),
+        );
 
         // 1) Approval
         let mut already_approved = false;
@@ -221,7 +224,8 @@ impl ToolOrchestrator {
                     tool_ctx.call_id.as_str(),
                     approval_ctx,
                     tool_ctx,
-                    /*evaluate_permission_request_hooks*/ !strict_auto_review || force_user_review,
+                    /*evaluate_permission_request_hooks*/
+                    !strict_auto_review || force_user_review,
                     &otel,
                 )
                 .await?;
@@ -637,6 +641,14 @@ impl ToolOrchestrator {
     }
 }
 
+fn use_guardian_for_review_mode(
+    configured_for_guardian: bool,
+    strict_auto_review: bool,
+    review_mode: ApprovalReviewMode,
+) -> bool {
+    review_mode == ApprovalReviewMode::Configured && (configured_for_guardian || strict_auto_review)
+}
+
 fn sandbox_outcome_from_tool_error(err: &ToolError) -> Option<&'static str> {
     match err {
         ToolError::Codex(CodexErr::Sandbox(SandboxErr::Denied { .. })) => Some("denied"),
@@ -651,3 +663,22 @@ fn build_denial_reason_from_output(_output: &ExecToolCallOutput) -> String {
     // output so we can evolve heuristics later without touching call sites.
     "command failed; retry without sandbox?".to_string()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn user_review_mode_bypasses_guardian_and_strict_auto_review() {
+        assert!(!use_guardian_for_review_mode(
+            /*configured_for_guardian*/ true,
+            /*strict_auto_review*/ true,
+            ApprovalReviewMode::User,
+        ));
+        assert!(use_guardian_for_review_mode(
+            /*configured_for_guardian*/ true,
+            /*strict_auto_review*/ false,
+            ApprovalReviewMode::Configured,
+        ));
+    }
+}
diff --git a/codex-rs/core/src/tools/spec_plan_tests.rs b/codex-rs/core/src/tools/spec_plan_tests.rs
index d19744be46..49c79ae530 100644
--- a/codex-rs/core/src/tools/spec_plan_tests.rs
+++ b/codex-rs/core/src/tools/spec_plan_tests.rs
@@ -749,6 +749,20 @@ async fn sleep_tool_follows_current_time_config() {
     );
 }
 
+#[tokio::test]
+async fn dependency_check_tool_requires_feature_flag() {
+    let disabled = probe(|_| {}).await;
+    disabled.assert_visible_lacks(&["dependency_check"]);
+    disabled.assert_registered_lacks(&["dependency_check"]);
+
+    let enabled = probe(|turn| {
+        set_feature(turn, Feature::DependencyCheck, /*enabled*/ true);
+    })
+    .await;
+    enabled.assert_visible_contains(&["dependency_check"]);
+    enabled.assert_registered_contains(&["dependency_check"]);
+}
+
 #[tokio::test]
 async fn mcp_and_tool_search_follow_direct_and_deferred_tool_exposure() {
     let direct_mcp = probe_with(
diff --git a/codex-rs/core/tests/suite/dependency_check.rs b/codex-rs/core/tests/suite/dependency_check.rs
new file mode 100644
index 0000000000..9ce2957acb
--- /dev/null
+++ b/codex-rs/core/tests/suite/dependency_check.rs
@@ -0,0 +1,197 @@
+use anyhow::Result;
+use codex_features::Feature;
+use codex_protocol::models::FileSystemPermissions;
+use codex_protocol::request_permissions::RequestPermissionProfile;
+use core_test_support::responses::ev_apply_patch_custom_tool_call;
+use core_test_support::responses::ev_assistant_message;
+use core_test_support::responses::ev_completed;
+use core_test_support::responses::ev_function_call;
+use core_test_support::responses::ev_response_created;
+use core_test_support::responses::mount_sse_sequence;
+use core_test_support::responses::sse;
+use core_test_support::test_codex::TestCodexBuilder;
+use core_test_support::test_codex::TestCodexHarness;
+use core_test_support::test_codex::test_codex;
+use serde_json::json;
+
+fn run_dependency_e2e<F, Fut>(test: F) -> Result<()>
+where
+    F: FnOnce() -> Fut + Send + 'static,
+    Fut: std::future::Future<Output = Result<()>> + 'static,
+{
+    std::thread::Builder::new()
+        .name("dependency-check-e2e".to_string())
+        .stack_size(32 * 1024 * 1024)
+        .spawn(move || {
+            tokio::runtime::Builder::new_current_thread()
+                .enable_all()
+                .build()?
+                .block_on(test())
+        })?
+        .join()
+        .map_err(|_| anyhow::anyhow!("dependency check test thread panicked"))?
+}
+
+fn dependency_check_builder() -> TestCodexBuilder {
+    test_codex().with_model("gpt-5.4").with_config(|config| {
+        config
+            .features
+            .enable(Feature::DependencyCheck)
+            .expect("test config should enable dependency_check");
+    })
+}
+
+async fn mount_function_call(
+    harness: &TestCodexHarness,
+    call_id: &str,
+    tool_name: &str,
+    arguments: serde_json::Value,
+) -> Result<()> {
+    mount_sse_sequence(
+        harness.server(),
+        vec![
+            sse(vec![
+                ev_response_created("resp-1"),
+                ev_function_call(call_id, tool_name, &serde_json::to_string(&arguments)?),
+                ev_completed("resp-1"),
+            ]),
+            sse(vec![
+                ev_assistant_message("msg-1", "done"),
+                ev_completed("resp-2"),
+            ]),
+        ],
+    )
+    .await;
+    Ok(())
+}
+
+#[test]
+fn shell_dependency_install_redirects_without_running_npm() -> Result<()> {
+    run_dependency_e2e(|| async {
+        let harness = TestCodexHarness::with_builder(dependency_check_builder()).await?;
+        let call_id = "dependency-shell-redirect";
+        mount_function_call(
+            &harness,
+            call_id,
+            "shell_command",
+            json!({"command": "npm install zod@3.23.8"}),
+        )
+        .await?;
+
+        harness.submit("add zod").await?;
+
+        let output = harness.function_call_stdout(call_id).await;
+        assert!(output.contains("Dependency Check is enabled"));
+        assert!(output.contains("dependency_check"));
+        assert!(!harness.path("package-lock.json").exists());
+        Ok(())
+    })
+}
+
+#[test]
+fn unified_exec_dependency_install_redirects_without_allocating_a_process() -> Result<()> {
+    run_dependency_e2e(|| async {
+        let builder = dependency_check_builder().with_config(|config| {
+            config.use_experimental_unified_exec_tool = true;
+            config
+                .features
+                .enable(Feature::UnifiedExec)
+                .expect("test config should enable unified exec");
+        });
+        let harness = TestCodexHarness::with_builder(builder).await?;
+        let call_id = "dependency-unified-redirect";
+        mount_function_call(
+            &harness,
+            call_id,
+            "exec_command",
+            json!({"cmd": "npm install zod@3.23.8", "yield_time_ms": 1_000}),
+        )
+        .await?;
+
+        harness.submit("add zod").await?;
+
+        let output = harness.function_call_stdout(call_id).await;
+        assert!(output.contains("Dependency Check is enabled"));
+        assert!(!output.contains("Process running with session ID"));
+        assert!(!harness.path("package-lock.json").exists());
+        Ok(())
+    })
+}
+
+#[test]
+fn apply_patch_rejects_dependency_manifest_edits_without_mutation() -> Result<()> {
+    run_dependency_e2e(|| async {
+        let harness = TestCodexHarness::with_builder(dependency_check_builder()).await?;
+        harness
+            .write_file("package.json", br#"{"name":"fixture","version":"1.0.0"}"#)
+            .await?;
+        let before = std::fs::read_to_string(harness.path("package.json"))?;
+        let call_id = "dependency-apply-patch-rejection";
+        let patch = "*** Begin Patch\n*** Update File: package.json\n@@\n-{\"name\":\"fixture\",\"version\":\"1.0.0\"}\n+{\"name\":\"fixture\",\"version\":\"1.0.1\"}\n*** End Patch";
+        mount_sse_sequence(
+            harness.server(),
+            vec![
+                sse(vec![
+                    ev_response_created("resp-1"),
+                    ev_apply_patch_custom_tool_call(call_id, patch),
+                    ev_completed("resp-1"),
+                ]),
+                sse(vec![
+                    ev_assistant_message("msg-1", "done"),
+                    ev_completed("resp-2"),
+                ]),
+            ],
+        )
+        .await;
+
+        harness.submit("edit package.json").await?;
+
+        let output = harness.apply_patch_output(call_id).await;
+        assert!(output.contains("Do not edit JavaScript dependency manifests"));
+        assert_eq!(
+            std::fs::read_to_string(harness.path("package.json"))?,
+            before
+        );
+        Ok(())
+    })
+}
+
+#[test]
+fn request_permissions_rejects_project_write_grants() -> Result<()> {
+    run_dependency_e2e(|| async {
+        let builder = dependency_check_builder().with_config(|config| {
+            config
+                .features
+                .enable(Feature::RequestPermissionsTool)
+                .expect("test config should enable request_permissions");
+        });
+        let harness = TestCodexHarness::with_builder(builder).await?;
+        let permissions = RequestPermissionProfile {
+            file_system: Some(FileSystemPermissions::from_read_write_roots(
+                /*read*/ None,
+                Some(vec![harness.path_abs("package.json")]),
+            )),
+            network: None,
+        };
+        let call_id = "dependency-request-permissions-rejection";
+        mount_function_call(
+            &harness,
+            call_id,
+            "request_permissions",
+            json!({
+                "reason": "make the project writable",
+                "permissions": permissions,
+            }),
+        )
+        .await?;
+
+        harness.submit("request project write access").await?;
+
+        let output = harness.function_call_stdout(call_id).await;
+        assert!(
+            output.contains("Generic tools cannot request permissions"),
+            "unexpected request_permissions output: {output}"
+        );
+        Ok(())
+    })
+}
diff --git a/codex-rs/core/tests/suite/mod.rs b/codex-rs/core/tests/suite/mod.rs
index e8bb48856c..c8b4dbdf51 100644
--- a/codex-rs/core/tests/suite/mod.rs
+++ b/codex-rs/core/tests/suite/mod.rs
@@ -49,6 +49,7 @@ mod compact_remote;
 mod compact_remote_parity;
 mod compact_resume_fork;
 mod current_time_reminder;
+mod dependency_check;
 mod deprecation_notice;
 mod exec;
 mod exec_policy;
diff --git a/codex-rs/dependency-check/Cargo.toml b/codex-rs/dependency-check/Cargo.toml
index a650e800b8..5593595be5 100644
--- a/codex-rs/dependency-check/Cargo.toml
+++ b/codex-rs/dependency-check/Cargo.toml
@@ -25,3 +25,4 @@ url = { workspace = true }
 [dev-dependencies]
 pretty_assertions = { workspace = true }
 tokio = { workspace = true, features = ["macros", "rt"] }
+wiremock = { workspace = true }
diff --git a/codex-rs/dependency-check/src/npm.rs b/codex-rs/dependency-check/src/npm.rs
index c5a956e387..b69c0701d5 100644
--- a/codex-rs/dependency-check/src/npm.rs
+++ b/codex-rs/dependency-check/src/npm.rs
@@ -428,6 +428,25 @@ mod tests {
         assert_eq!(graph.compare_installed(&installed), Ok(()));
     }
 
+    #[test]
+    fn reports_lock_and_installed_graph_mismatches() {
+        let checked = NpmGraph::from_query_json(
+            r#"[{"name":"zod","version":"3.23.8","location":"node_modules/zod","resolved":"https://registry.npmjs.org/zod/-/zod-3.23.8.tgz","integrity":"sha512-checked"}]"#,
+        )
+        .expect("checked graph");
+        let changed = NpmGraph::from_query_json(
+            r#"[{"name":"zod","version":"3.24.0","location":"node_modules/zod","resolved":"https://registry.npmjs.org/zod/-/zod-3.24.0.tgz","integrity":"sha512-changed"}]"#,
+        )
+        .expect("changed graph");
+        let installed = NpmInstalledGraph::from_query_json(
+            r#"[{"name":"zod","version":"3.24.0","location":"node_modules/zod","resolved":"https://registry.npmjs.org/zod/-/zod-3.24.0.tgz"}]"#,
+        )
+        .expect("installed graph");
+
+        assert!(checked.compare(&changed).is_err());
+        assert!(checked.compare_installed(&installed).is_err());
+    }
+
     #[test]
     fn rejects_unverifiable_sources() {
         let err = NpmGraph::from_query_json(
diff --git a/codex-rs/dependency-check/src/osv.rs b/codex-rs/dependency-check/src/osv.rs
index 36e2e5b2c4..a191834afa 100644
--- a/codex-rs/dependency-check/src/osv.rs
+++ b/codex-rs/dependency-check/src/osv.rs
@@ -191,6 +191,18 @@ struct Vulnerability {
 mod tests {
     use super::*;
     use pretty_assertions::assert_eq;
+    use wiremock::Mock;
+    use wiremock::MockServer;
+    use wiremock::ResponseTemplate;
+    use wiremock::matchers::method;
+    use wiremock::matchers::path;
+
+    fn graph() -> NpmGraph {
+        NpmGraph::from_query_json(
+            r#"[{"name":"example","version":"1.0.0","location":"node_modules/example","resolved":"https://registry.npmjs.org/example/-/example-1.0.0.tgz","integrity":"sha512-example"}]"#,
+        )
+        .expect("parse graph")
+    }
 
     #[test]
     fn maps_malware_to_block_and_cves_to_warn() {
@@ -242,4 +254,47 @@ mod tests {
         .expect_err("partial response should fail");
         assert!(matches!(err, OsvError::ResultCountMismatch { .. }));
     }
+
+    #[tokio::test]
+    async fn mocked_malware_response_blocks_dependency_graph() {
+        let server = MockServer::start().await;
+        Mock::given(method("POST"))
+            .and(path("/v1/querybatch"))
+            .respond_with(ResponseTemplate::new(200).set_body_json(serde_json::json!({
+                "results": [{
+                    "vulns": [{"id": "MAL-2026-1", "summary": "malware"}]
+                }]
+            })))
+            .mount(&server)
+            .await;
+        let endpoint =
+            Url::parse(&format!("{}/v1/querybatch", server.uri())).expect("mock endpoint");
+        let report = OsvClient::with_endpoint(endpoint)
+            .expect("client")
+            .evaluate(&graph())
+            .await
+            .expect("policy report");
+
+        assert_eq!(report.action, DependencyPolicyAction::Block);
+        assert_eq!(report.risks[0].kind, DependencyRiskKind::Malware);
+    }
+
+    #[tokio::test]
+    async fn mocked_provider_failure_fails_closed() {
+        let server = MockServer::start().await;
+        Mock::given(method("POST"))
+            .and(path("/v1/querybatch"))
+            .respond_with(ResponseTemplate::new(503))
+            .mount(&server)
+            .await;
+        let endpoint =
+            Url::parse(&format!("{}/v1/querybatch", server.uri())).expect("mock endpoint");
+        let err = OsvClient::with_endpoint(endpoint)
+            .expect("client")
+            .evaluate(&graph())
+            .await
+            .expect_err("provider failure should fail closed");
+
+        assert!(matches!(err, OsvError::Request(_)));
+    }
 }
diff --git a/codex-rs/tools/src/lib.rs b/codex-rs/tools/src/lib.rs
index 07d181e7fd..63e200d77d 100644
--- a/codex-rs/tools/src/lib.rs
+++ b/codex-rs/tools/src/lib.rs
@@ -26,8 +26,8 @@ pub use code_mode::code_mode_name_for_tool_name;
 pub use code_mode::collect_code_mode_exec_prompt_tool_definitions;
 pub use code_mode::collect_code_mode_tool_definitions;
 pub use code_mode::tool_spec_to_code_mode_tool_definition;
-pub use dependency_check_tool::create_dependency_check_tool;
 pub use codex_protocol::ToolName;
+pub use dependency_check_tool::create_dependency_check_tool;
 pub use dynamic_tool::parse_dynamic_tool;
 pub use function_call_error::FunctionCallError;
 pub use image_detail::can_request_original_image_detail;
diff --git a/docs/dependency-check.md b/docs/dependency-check.md
index d610f343f6..931721a906 100644
--- a/docs/dependency-check.md
+++ b/docs/dependency-check.md
@@ -50,12 +50,17 @@ not a general assertion that a package is trustworthy.
 When the feature is enabled, Codex rejects recognizable direct dependency-add
 commands such as `npm install package@version`, `pnpm add`, `yarn add`, and
 `bun add`, directing the model to `dependency_check`. It also rejects direct
-`apply_patch` changes to JavaScript package manifests and lockfiles.
+`apply_patch` changes to JavaScript package manifests and lockfiles. Generic
+shell tools cannot request full sandbox bypass or additional write permissions
+that overlap the active project, and `request_permissions` cannot grant write
+access to dependency manifests.
 
 The real project mutation still uses the existing shell sandbox and approval
-orchestrator. A permission profile can therefore keep the root manifest and
-lockfile read-only inside the sandbox so the checked update produces a user
-approval prompt:
+orchestrator. Its request is limited to `package.json` and `package-lock.json`
+and is always routed to the user, even when the session normally uses automatic
+approval review. A permission profile should keep the root manifest and
+lockfile read-only inside the ambient sandbox so only the structured tool can
+request that exact write access:
 
 ```toml
 default_permissions = "dependency-check"
@@ -93,7 +98,8 @@ filesystem enforcement. The tool grants its own temporary resolution
 directory as a preapproved, per-command write path; that does not widen access
 to the project. The checked project update separately requests per-command
 write access to `package.json` and `package-lock.json`; with `on-request`
-approval, that request produces the user prompt.
+approval, that request produces the human prompt. Denial stops before the
+project command runs.
 
 ## Current limitations