diff --git a/lib/crates/fabro-cli/tests/it/cmd/exec.rs b/lib/crates/fabro-cli/tests/it/cmd/exec.rs
index 57818b031..612ffb8b8 100644
--- a/lib/crates/fabro-cli/tests/it/cmd/exec.rs
+++ b/lib/crates/fabro-cli/tests/it/cmd/exec.rs
@@ -2,7 +2,7 @@
 
 use std::process::Output;
 
-use fabro_test::{fabro_snapshot, test_context};
+use fabro_test::{fabro_snapshot, preserve_coverage_env, test_context};
 use httpmock::MockServer;
 
 async fn run_success_output(mut cmd: assert_cmd::Command) -> Output {
@@ -85,6 +85,7 @@ fn exec_missing_api_key_exits_with_error() {
     let mut cmd = context.exec_cmd();
     cmd.arg("test prompt");
     cmd.env_clear();
+    preserve_coverage_env!(cmd);
     cmd.env("HOME", &context.home_dir);
     fabro_snapshot!(context.filters(), cmd, @"
     success: false
@@ -106,6 +107,7 @@ fn exec_uses_user_config_defaults() {
     let mut cmd = context.exec_cmd();
     cmd.arg("test prompt");
     cmd.env_clear();
+    preserve_coverage_env!(cmd);
     cmd.env("HOME", &context.home_dir);
     cmd.env("FABRO_STORAGE_DIR", &context.storage_dir);
     cmd.env("FABRO_NO_UPGRADE_CHECK", "true")
@@ -133,6 +135,7 @@ fn exec_server_target_uses_remote_transport_instead_of_local_api_key_resolution(
 
     let mut cmd = context.exec_cmd();
     cmd.env_clear();
+    preserve_coverage_env!(cmd);
     cmd.env("HOME", &context.home_dir);
     cmd.env("FABRO_NO_UPGRADE_CHECK", "true")
         .env("FABRO_HTTP_PROXY_POLICY", "disabled");
@@ -176,6 +179,7 @@ fn exec_configured_server_target_alone_does_not_reroute_exec() {
 
     let mut cmd = context.exec_cmd();
     cmd.env_clear();
+    preserve_coverage_env!(cmd);
     cmd.env("HOME", &context.home_dir);
     cmd.env("FABRO_NO_UPGRADE_CHECK", "true")
         .env("FABRO_HTTP_PROXY_POLICY", "disabled");
@@ -224,6 +228,7 @@ fn exec_cli_server_target_overrides_configured_server_target() {
 
     let mut cmd = context.exec_cmd();
     cmd.env_clear();
+    preserve_coverage_env!(cmd);
     cmd.env("HOME", &context.home_dir);
     cmd.env("FABRO_NO_UPGRADE_CHECK", "true")
         .env("FABRO_HTTP_PROXY_POLICY", "disabled");
diff --git a/lib/crates/fabro-cli/tests/it/support/mod.rs b/lib/crates/fabro-cli/tests/it/support/mod.rs
index bd4dd337c..4c2bbc5e3 100644
--- a/lib/crates/fabro-cli/tests/it/support/mod.rs
+++ b/lib/crates/fabro-cli/tests/it/support/mod.rs
@@ -1,6 +1,6 @@
 use assert_cmd::Command;
 use fabro_store::EventEnvelope;
-use fabro_test::TestContext;
+use fabro_test::{TestContext, preserve_coverage_env};
 use fabro_types::RunId;
 macro_rules! fabro_json_snapshot {
     ($context:expr, $value:expr, @$snapshot:literal) => {{
@@ -85,6 +85,7 @@ impl LightweightCli {
     pub(crate) fn command(&self) -> Command {
         let mut cmd = Command::new(env!("CARGO_BIN_EXE_fabro"));
         cmd.env_clear();
+        preserve_coverage_env!(cmd);
         if let Some(path) = std::env::var_os("PATH") {
             cmd.env("PATH", path);
         }
diff --git a/lib/crates/fabro-test/src/lib.rs b/lib/crates/fabro-test/src/lib.rs
index 4828978b7..2429802ab 100644
--- a/lib/crates/fabro-test/src/lib.rs
+++ b/lib/crates/fabro-test/src/lib.rs
@@ -14,6 +14,20 @@ use serde_json::{Map, Value, json};
 use toml::Value as TomlValue;
 use toml::map::Map as TomlMap;
 
+/// Re-export `LLVM_PROFILE_FILE` into a `Command` whose env was just cleared,
+/// so subprocess coverage data lands in the profile path that
+/// `cargo-llvm-cov` configured for the parent test process. Accepts both
+/// `std::process::Command` and `assert_cmd::Command` (any type with an
+/// `env(key, value)` method).
+#[macro_export]
+macro_rules! preserve_coverage_env {
+    ($cmd:expr) => {{
+        if let Some(val) = ::std::env::var_os("LLVM_PROFILE_FILE") {
+            $cmd.env("LLVM_PROFILE_FILE", val);
+        }
+    }};
+}
+
 /// Walk up from `start` to find the repo-level `test/` fixtures directory.
 pub fn find_test_fixtures_dir(start: &Path) -> Option<PathBuf> {
     let mut dir = start;
@@ -113,6 +127,7 @@ pub fn require_env(name: &str) -> Option<String> {
 /// subsequent `.env(...)` call, which survives the clear.
 pub fn apply_test_isolation(cmd: &mut std::process::Command, home_dir: &Path) {
     cmd.env_clear();
+    preserve_coverage_env!(cmd);
     if let Some(path) = std::env::var_os("PATH") {
         cmd.env("PATH", path);
     }