diff --git a/examples/src/bin/compose_runner.rs b/examples/src/bin/compose_runner.rs
index e129305..348885d 100644
--- a/examples/src/bin/compose_runner.rs
+++ b/examples/src/bin/compose_runner.rs
@@ -1,19 +1,13 @@
-use std::{
-    env, fs,
-    path::{Path, PathBuf},
-    process,
-    time::Duration,
-};
+use std::{process, time::Duration};
 
 use anyhow::{Context as _, Result};
-use runner_examples::{ChaosBuilderExt as _, ScenarioBuilderExt as _, read_env_any};
+use runner_examples::{
+    ChaosBuilderExt as _, ScenarioBuilderExt as _, defaults::Mode, demo, read_env_any,
+};
 use testing_framework_core::scenario::{Deployer as _, Runner, ScenarioBuilder};
 use testing_framework_runner_compose::{ComposeDeployer, ComposeRunnerError};
 use tracing::{info, warn};
 
-const DEFAULT_VALIDATORS: usize = 1;
-const DEFAULT_EXECUTORS: usize = 1;
-const DEFAULT_RUN_SECS: u64 = 60;
 const MIXED_TXS_PER_BLOCK: u64 = 5;
 const TOTAL_WALLETS: usize = 1000;
 const TRANSACTION_WALLETS: usize = 500;
@@ -30,28 +24,15 @@ const DA_BLOB_RATE: u64 = 1;
 
 #[tokio::main]
 async fn main() {
-    init_node_log_dir_defaults();
-
-    // Compose containers mount KZG params at /kzgrs_test_params; ensure the
-    // generated configs point there unless the caller overrides explicitly.
-    if env::var("NOMOS_KZGRS_PARAMS_PATH").is_err() {
-        // Safe: setting a process-wide environment variable before any threads
-        // or async tasks are spawned.
-        unsafe {
-            env::set_var(
-                "NOMOS_KZGRS_PARAMS_PATH",
-                "/kzgrs_test_params/kzgrs_test_params",
-            );
-        }
-    }
+    runner_examples::defaults::init_node_log_dir_defaults(Mode::Compose);
 
     tracing_subscriber::fmt::init();
 
-    let validators = read_env_any(&["NOMOS_DEMO_VALIDATORS"], DEFAULT_VALIDATORS);
+    let validators = read_env_any(&["NOMOS_DEMO_VALIDATORS"], demo::DEFAULT_VALIDATORS);
 
-    let executors = read_env_any(&["NOMOS_DEMO_EXECUTORS"], DEFAULT_EXECUTORS);
+    let executors = read_env_any(&["NOMOS_DEMO_EXECUTORS"], demo::DEFAULT_EXECUTORS);
 
-    let run_secs = read_env_any(&["NOMOS_DEMO_RUN_SECS"], DEFAULT_RUN_SECS);
+    let run_secs = read_env_any(&["NOMOS_DEMO_RUN_SECS"], demo::DEFAULT_RUN_SECS);
 
     info!(
         validators,
@@ -64,35 +45,6 @@ async fn main() {
     }
 }
 
-fn init_node_log_dir_defaults() {
-    if env::var_os("NOMOS_LOG_DIR").is_some() {
-        return;
-    }
-
-    let repo_root = repo_root();
-    let host_dir = repo_root.join("tmp").join("node-logs");
-    let _ = fs::create_dir_all(&host_dir);
-
-    // In compose mode, node processes run inside containers; configs should
-    // point to the container path, while the compose deployer mounts the host
-    // repo's `tmp/node-logs` there.
-    unsafe {
-        env::set_var("NOMOS_LOG_DIR", "/tmp/node-logs");
-    }
-}
-
-fn repo_root() -> PathBuf {
-    env::var("CARGO_WORKSPACE_DIR")
-        .map(PathBuf::from)
-        .ok()
-        .or_else(|| {
-            Path::new(env!("CARGO_MANIFEST_DIR"))
-                .parent()
-                .map(Path::to_path_buf)
-        })
-        .expect("repo root must be discoverable from CARGO_WORKSPACE_DIR or CARGO_MANIFEST_DIR")
-}
-
 async fn run_compose_case(
     validators: usize,
     executors: usize,
diff --git a/examples/src/bin/cucumber_compose.rs b/examples/src/bin/cucumber_compose.rs
index 4b05005..6defa41 100644
--- a/examples/src/bin/cucumber_compose.rs
+++ b/examples/src/bin/cucumber_compose.rs
@@ -1,5 +1,6 @@
-use runner_examples::cucumber::{
-    Mode, init_logging_defaults, init_node_log_dir_defaults, init_tracing, run,
+use runner_examples::{
+    cucumber::run,
+    defaults::{Mode, init_logging_defaults, init_node_log_dir_defaults, init_tracing},
 };
 
 #[tokio::main(flavor = "current_thread")]
diff --git a/examples/src/bin/cucumber_host.rs b/examples/src/bin/cucumber_host.rs
index b98945e..fb5670d 100644
--- a/examples/src/bin/cucumber_host.rs
+++ b/examples/src/bin/cucumber_host.rs
@@ -1,5 +1,6 @@
-use runner_examples::cucumber::{
-    Mode, init_logging_defaults, init_node_log_dir_defaults, init_tracing, run,
+use runner_examples::{
+    cucumber::run,
+    defaults::{Mode, init_logging_defaults, init_node_log_dir_defaults, init_tracing},
 };
 
 #[tokio::main(flavor = "current_thread")]
diff --git a/examples/src/bin/k8s_runner.rs b/examples/src/bin/k8s_runner.rs
index d9a9ea9..0cc70e2 100644
--- a/examples/src/bin/k8s_runner.rs
+++ b/examples/src/bin/k8s_runner.rs
@@ -1,7 +1,7 @@
 use std::{env, process, time::Duration};
 
 use anyhow::{Context as _, Result};
-use runner_examples::{ScenarioBuilderExt as _, read_env_any};
+use runner_examples::{ScenarioBuilderExt as _, demo, read_env_any};
 use testing_framework_core::scenario::{
     Deployer as _, ObservabilityCapability, Runner, ScenarioBuilder,
 };
@@ -9,9 +9,6 @@ use testing_framework_runner_k8s::{K8sDeployer, K8sRunnerError};
 use testing_framework_workflows::ObservabilityBuilderExt as _;
 use tracing::{info, warn};
 
-const DEFAULT_RUN_SECS: u64 = 60;
-const DEFAULT_VALIDATORS: usize = 1;
-const DEFAULT_EXECUTORS: usize = 1;
 const MIXED_TXS_PER_BLOCK: u64 = 2;
 const TOTAL_WALLETS: usize = 200;
 const TRANSACTION_WALLETS: usize = 50;
@@ -21,9 +18,9 @@ const DA_BLOB_RATE: u64 = 1;
 async fn main() {
     tracing_subscriber::fmt::init();
 
-    let validators = read_env_any(&["NOMOS_DEMO_VALIDATORS"], DEFAULT_VALIDATORS);
-    let executors = read_env_any(&["NOMOS_DEMO_EXECUTORS"], DEFAULT_EXECUTORS);
-    let run_secs = read_env_any(&["NOMOS_DEMO_RUN_SECS"], DEFAULT_RUN_SECS);
+    let validators = read_env_any(&["NOMOS_DEMO_VALIDATORS"], demo::DEFAULT_VALIDATORS);
+    let executors = read_env_any(&["NOMOS_DEMO_EXECUTORS"], demo::DEFAULT_EXECUTORS);
+    let run_secs = read_env_any(&["NOMOS_DEMO_RUN_SECS"], demo::DEFAULT_RUN_SECS);
     info!(validators, executors, run_secs, "starting k8s runner demo");
 
     if let Err(err) = run_k8s_case(validators, executors, Duration::from_secs(run_secs)).await {
diff --git a/examples/src/bin/local_runner.rs b/examples/src/bin/local_runner.rs
index 84a4f76..d82f4ff 100644
--- a/examples/src/bin/local_runner.rs
+++ b/examples/src/bin/local_runner.rs
@@ -1,19 +1,11 @@
-use std::{
-    env, fs,
-    path::{Path, PathBuf},
-    process,
-    time::Duration,
-};
+use std::{env, process, time::Duration};
 
 use anyhow::{Context as _, Result};
-use runner_examples::{ScenarioBuilderExt as _, read_env_any};
+use runner_examples::{ScenarioBuilderExt as _, defaults::Mode, demo, read_env_any};
 use testing_framework_core::scenario::{Deployer as _, Runner, ScenarioBuilder};
 use testing_framework_runner_local::LocalDeployer;
 use tracing::{info, warn};
 
-const DEFAULT_VALIDATORS: usize = 1;
-const DEFAULT_EXECUTORS: usize = 1;
-const DEFAULT_RUN_SECS: u64 = 60;
 const MIXED_TXS_PER_BLOCK: u64 = 5;
 const TOTAL_WALLETS: usize = 1000;
 const TRANSACTION_WALLETS: usize = 500;
@@ -22,7 +14,7 @@ const SMOKE_RUN_SECS_MAX: u64 = 30;
 
 #[tokio::main]
 async fn main() {
-    init_node_log_dir_defaults();
+    runner_examples::defaults::init_node_log_dir_defaults(Mode::Host);
 
     tracing_subscriber::fmt::init();
 
@@ -31,9 +23,9 @@ async fn main() {
         process::exit(1);
     }
 
-    let validators = read_env_any(&["NOMOS_DEMO_VALIDATORS"], DEFAULT_VALIDATORS);
-    let executors = read_env_any(&["NOMOS_DEMO_EXECUTORS"], DEFAULT_EXECUTORS);
-    let run_secs = read_env_any(&["NOMOS_DEMO_RUN_SECS"], DEFAULT_RUN_SECS);
+    let validators = read_env_any(&["NOMOS_DEMO_VALIDATORS"], demo::DEFAULT_VALIDATORS);
+    let executors = read_env_any(&["NOMOS_DEMO_EXECUTORS"], demo::DEFAULT_EXECUTORS);
+    let run_secs = read_env_any(&["NOMOS_DEMO_RUN_SECS"], demo::DEFAULT_RUN_SECS);
 
     info!(
         validators,
@@ -46,30 +38,6 @@ async fn main() {
     }
 }
 
-fn init_node_log_dir_defaults() {
-    if env::var_os("NOMOS_LOG_DIR").is_some() {
-        return;
-    }
-
-    let host_dir = repo_root().join("tmp").join("node-logs");
-    let _ = fs::create_dir_all(&host_dir);
-    unsafe {
-        env::set_var("NOMOS_LOG_DIR", host_dir);
-    }
-}
-
-fn repo_root() -> PathBuf {
-    env::var("CARGO_WORKSPACE_DIR")
-        .map(PathBuf::from)
-        .ok()
-        .or_else(|| {
-            Path::new(env!("CARGO_MANIFEST_DIR"))
-                .parent()
-                .map(Path::to_path_buf)
-        })
-        .expect("repo root must be discoverable from CARGO_WORKSPACE_DIR or CARGO_MANIFEST_DIR")
-}
-
 async fn run_local_case(validators: usize, executors: usize, run_duration: Duration) -> Result<()> {
     info!(
         validators,
diff --git a/examples/src/cucumber.rs b/examples/src/cucumber.rs
index 9c720ea..7627762 100644
--- a/examples/src/cucumber.rs
+++ b/examples/src/cucumber.rs
@@ -1,29 +1,11 @@
-use std::{
-    env, fs,
-    path::{Path, PathBuf},
-};
-
 use cucumber::World;
 use cucumber_ext::TestingFrameworkWorld;
-use tracing_subscriber::{EnvFilter, fmt};
+
+pub use crate::defaults::Mode;
 
 const FEATURES_PATH: &str = "examples/cucumber/features";
 
-#[derive(Clone, Copy, Debug, Eq, PartialEq)]
-pub enum Mode {
-    Host,
-    Compose,
-}
-
-fn set_default_env(key: &str, value: &str) {
-    if std::env::var_os(key).is_none() {
-        // SAFETY: Used as an early-run default. Prefer setting env vars in the
-        // shell for multi-threaded runs.
-        unsafe {
-            std::env::set_var(key, value);
-        }
-    }
-}
+pub use crate::defaults::{init_logging_defaults, init_node_log_dir_defaults, init_tracing};
 
 fn is_compose(
     feature: &cucumber::gherkin::Feature,
@@ -33,44 +15,6 @@ fn is_compose(
         || feature.tags.iter().any(|tag| tag == "compose")
 }
 
-pub fn init_logging_defaults() {
-    set_default_env("POL_PROOF_DEV_MODE", "true");
-    set_default_env("NOMOS_TESTS_KEEP_LOGS", "1");
-    set_default_env("NOMOS_LOG_LEVEL", "info");
-    set_default_env("RUST_LOG", "info");
-}
-
-pub fn init_node_log_dir_defaults(mode: Mode) {
-    if env::var_os("NOMOS_LOG_DIR").is_some() {
-        return;
-    }
-
-    let host_dir = repo_root().join("tmp").join("node-logs");
-    let _ = fs::create_dir_all(&host_dir);
-
-    match mode {
-        Mode::Host => set_default_env("NOMOS_LOG_DIR", &host_dir.display().to_string()),
-        Mode::Compose => set_default_env("NOMOS_LOG_DIR", "/tmp/node-logs"),
-    }
-}
-
-fn repo_root() -> PathBuf {
-    env::var("CARGO_WORKSPACE_DIR")
-        .map(PathBuf::from)
-        .ok()
-        .or_else(|| {
-            Path::new(env!("CARGO_MANIFEST_DIR"))
-                .parent()
-                .map(Path::to_path_buf)
-        })
-        .expect("repo root must be discoverable from CARGO_WORKSPACE_DIR or CARGO_MANIFEST_DIR")
-}
-
-pub fn init_tracing() {
-    let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"));
-    let _ = fmt().with_env_filter(filter).with_target(true).try_init();
-}
-
 pub async fn run(mode: Mode) {
     TestingFrameworkWorld::cucumber()
         .with_default_cli()
diff --git a/examples/src/defaults.rs b/examples/src/defaults.rs
new file mode 100644
index 0000000..b1e6c8e
--- /dev/null
+++ b/examples/src/defaults.rs
@@ -0,0 +1,63 @@
+use std::{
+    env, fs,
+    path::{Path, PathBuf},
+};
+
+use tracing_subscriber::{EnvFilter, fmt};
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum Mode {
+    Host,
+    Compose,
+}
+
+const DEFAULT_NODE_LOG_DIR_REL: &str = ".tmp/node-logs";
+const DEFAULT_CONTAINER_NODE_LOG_DIR: &str = "/tmp/node-logs";
+
+fn set_default_env(key: &str, value: &str) {
+    if std::env::var_os(key).is_none() {
+        // SAFETY: Used as an early-run default. Prefer setting env vars in the
+        // shell for multi-threaded runs.
+        unsafe {
+            std::env::set_var(key, value);
+        }
+    }
+}
+
+pub fn init_logging_defaults() {
+    set_default_env("POL_PROOF_DEV_MODE", "true");
+    set_default_env("NOMOS_TESTS_KEEP_LOGS", "1");
+    set_default_env("NOMOS_LOG_LEVEL", "info");
+    set_default_env("RUST_LOG", "info");
+}
+
+pub fn init_node_log_dir_defaults(mode: Mode) {
+    if env::var_os("NOMOS_LOG_DIR").is_some() {
+        return;
+    }
+
+    let host_dir = repo_root().join(DEFAULT_NODE_LOG_DIR_REL);
+    let _ = fs::create_dir_all(&host_dir);
+
+    match mode {
+        Mode::Host => set_default_env("NOMOS_LOG_DIR", &host_dir.display().to_string()),
+        Mode::Compose => set_default_env("NOMOS_LOG_DIR", DEFAULT_CONTAINER_NODE_LOG_DIR),
+    }
+}
+
+pub fn init_tracing() {
+    let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"));
+    let _ = fmt().with_env_filter(filter).with_target(true).try_init();
+}
+
+fn repo_root() -> PathBuf {
+    env::var("CARGO_WORKSPACE_DIR")
+        .map(PathBuf::from)
+        .ok()
+        .or_else(|| {
+            Path::new(env!("CARGO_MANIFEST_DIR"))
+                .parent()
+                .map(Path::to_path_buf)
+        })
+        .unwrap_or_else(|| PathBuf::from(env!("CARGO_MANIFEST_DIR")))
+}
diff --git a/examples/src/demo.rs b/examples/src/demo.rs
new file mode 100644
index 0000000..ead3b49
--- /dev/null
+++ b/examples/src/demo.rs
@@ -0,0 +1,3 @@
+pub const DEFAULT_VALIDATORS: usize = 1;
+pub const DEFAULT_EXECUTORS: usize = 1;
+pub const DEFAULT_RUN_SECS: u64 = 60;
diff --git a/examples/src/lib.rs b/examples/src/lib.rs
index c3186b3..a124fc3 100644
--- a/examples/src/lib.rs
+++ b/examples/src/lib.rs
@@ -1,4 +1,6 @@
 pub mod cucumber;
+pub mod defaults;
+pub mod demo;
 pub mod env;
 
 pub use env::read_env_any;