diff --git a/lib/apps/fabro-cli/tests/it/cmd/attach.rs b/lib/apps/fabro-cli/tests/it/cmd/attach.rs
index 4d279727d..585a29fe0 100644
--- a/lib/apps/fabro-cli/tests/it/cmd/attach.rs
+++ b/lib/apps/fabro-cli/tests/it/cmd/attach.rs
@@ -1084,6 +1084,91 @@ fn attach_json_errors_without_prompting_for_human_input() {
         "run_id": "[ULID]",
         "ts": "[TIMESTAMP]"
       },
+      {
+        "actor": {
+          "kind": "worker",
+          "run_id": "[ULID]"
+        },
+        "event": "sandbox.create.started",
+        "id": "[EVENT_ID]",
+        "properties": {
+          "action": "create",
+          "correlation_id": "[ULID]",
+          "id": {
+            "sequence": 1,
+            "source_id": "[HEX]"
+          },
+          "occurred_at": "[TIMESTAMP]",
+          "operation_id": "[HEX]",
+          "provider": "host",
+          "subject": {
+            "id": "host-dir-[HEX]",
+            "type": "sandbox"
+          },
+          "type": "operation_started"
+        },
+        "run_id": "[ULID]",
+        "ts": "[TIMESTAMP]"
+      },
+      {
+        "actor": {
+          "kind": "worker",
+          "run_id": "[ULID]"
+        },
+        "event": "sandbox.create.progress",
+        "id": "[EVENT_ID]",
+        "properties": {
+          "action": "create",
+          "correlation_id": "[ULID]",
+          "id": {
+            "sequence": 2,
+            "source_id": "[HEX]"
+          },
+          "occurred_at": "[TIMESTAMP]",
+          "operation_id": "[HEX]",
+          "progress": {
+            "code": "sandbox.provision"
+          },
+          "provider": "host",
+          "subject": {
+            "id": "host-dir-[HEX]",
+            "type": "sandbox"
+          },
+          "type": "operation_progress"
+        },
+        "run_id": "[ULID]",
+        "ts": "[TIMESTAMP]"
+      },
+      {
+        "actor": {
+          "kind": "worker",
+          "run_id": "[ULID]"
+        },
+        "event": "sandbox.create.completed",
+        "id": "[EVENT_ID]",
+        "properties": {
+          "action": "create",
+          "correlation_id": "[ULID]",
+          "duration": {
+            "nanos": "[NANOS]",
+            "secs": 0
+          },
+          "id": {
+            "sequence": 3,
+            "source_id": "[HEX]"
+          },
+          "occurred_at": "[TIMESTAMP]",
+          "operation_id": "[HEX]",
+          "provider": "host",
+          "subject": {
+            "id": "host-dir-[HEX]",
+            "type": "sandbox"
+          },
+          "type": "operation_completed"
+        },
+        "run_id": "[ULID]",
+        "ts": "[TIMESTAMP]"
+      },
       {
         "actor": {
           "kind": "worker",
@@ -1119,8 +1204,9 @@ fn attach_json_errors_without_prompting_for_human_input() {
         "event": "sandbox.initialized",
         "id": "[EVENT_ID]",
         "properties": {
-          "id": "local:[ULID]",
+          "id": "host-dir-[HEX]",
           "provider": "local",
+          "repo_cloned": false,
           "working_directory": "[TEMP_DIR]"
         },
         "run_id": "[ULID]",
diff --git a/lib/components/fabro-workflow/src/pipeline/initialize.rs b/lib/components/fabro-workflow/src/pipeline/initialize.rs
index 1b3d849ab..780bb719c 100644
--- a/lib/components/fabro-workflow/src/pipeline/initialize.rs
+++ b/lib/components/fabro-workflow/src/pipeline/initialize.rs
@@ -487,12 +487,16 @@ pub async fn initialize(
                 error,
             ));
         }
+        // A local sandbox's id is derived from its directory, which the
+        // record already names; it is not a name worth showing.
+        let name = Some(sandbox.sandbox_info())
+            .filter(|name| !name.is_empty() && !sandbox.kind().is_local());
         options.emitter.emit(&Event::Sandbox {
             event: SandboxLifecycle::Ready {
-                provider:    provider_name.clone(),
+                provider: provider_name.clone(),
                 duration_ms: elapsed_ms(started),
-                name:        Some(sandbox.sandbox_info()).filter(|name| !name.is_empty()),
-                url:         sandbox.console_url().await,
+                name,
+                url: sandbox.console_url().await,
             },
         });
     }
diff --git a/lib/foundation/fabro-test/src/lib.rs b/lib/foundation/fabro-test/src/lib.rs
index 62dd1a89c..716984e19 100644
--- a/lib/foundation/fabro-test/src/lib.rs
+++ b/lib/foundation/fabro-test/src/lib.rs
@@ -74,6 +74,18 @@ static INSTA_FILTERS: &[(&str, &str)] = &[
         "Duration:  [DURATION]",
     ),
     (r"Base: [^\n]+ \([0-9a-f]{7,40}\)", "Base: [BASE]"),
+    // The sandbox driver's events: per-process event source ids, operation
+    // ids, sub-second durations, and a local sandbox's path-derived id.
+    (
+        r#""source_id"(\s*:\s*)"[0-9a-f]{32}""#,
+        r#""source_id"$1"[HEX]""#,
+    ),
+    (
+        r#""operation_id"(\s*:\s*)"[0-9a-f]{32}""#,
+        r#""operation_id"$1"[HEX]""#,
+    ),
+    (r#""nanos"(\s*:\s*)\d+"#, r#""nanos"$1"[NANOS]""#),
+    (r"host-dir-[0-9a-f]+", "host-dir-[HEX]"),
     (r"\\([\w\d])", "/$1"),
 ];