diff --git a/src/config/agent.rs b/src/config/agent.rs
index a17d733..c452c8c 100644
--- a/src/config/agent.rs
+++ b/src/config/agent.rs
@@ -678,6 +678,7 @@ impl AgentConfig {
             global_tools: graph.global_tools.clone(),
             mcp_servers: graph.mcp_servers.clone(),
             conversation_starters: graph.conversation_starters.clone(),
+            variables: graph.variables.clone(),
             can_spawn_agents: graph.has_agent_node(),
             max_concurrent_agents: default_max_concurrent_agents(),
             max_agent_depth: default_max_agent_depth(),
diff --git a/src/config/mod.rs b/src/config/mod.rs
index 08af88e..602d59d 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -14,7 +14,9 @@ pub(crate) mod todo;
 mod tool_scope;
 mod update;
 
-pub use self::agent::{Agent, AgentVariables, complete_agent_variables, list_agents};
+pub use self::agent::{
+    Agent, AgentVariable, AgentVariables, complete_agent_variables, list_agents,
+};
 #[allow(unused_imports)]
 pub use self::app_config::AppConfig;
 #[allow(unused_imports)]
diff --git a/src/graph/executor.rs b/src/graph/executor.rs
index 8670b4d..349e9d7 100644
--- a/src/graph/executor.rs
+++ b/src/graph/executor.rs
@@ -76,7 +76,12 @@ impl GraphExecutor {
         }
 
         let mut state = StateManager::new(graph.initial_state.clone());
-        let script_executor = ScriptExecutor::new(&base_dir);
+        let agent_envs = ctx
+            .agent
+            .as_ref()
+            .map(|a| a.variable_envs())
+            .unwrap_or_default();
+        let script_executor = ScriptExecutor::new(&base_dir).with_envs(agent_envs);
         let max_iterations = graph.settings.max_loop_iterations;
         let graph_timeout = graph.settings.timeout.map(Duration::from_secs);
         let max_concurrency = graph.settings.max_concurrency;
diff --git a/src/graph/script.rs b/src/graph/script.rs
index cd53a53..c7541d1 100644
--- a/src/graph/script.rs
+++ b/src/graph/script.rs
@@ -1,26 +1,43 @@
 use super::state::{StateManager, StateRepresentation};
 use super::types::ScriptNode;
+use crate::config::paths;
 use crate::function::Language;
 use anyhow::{Context, Result, anyhow, bail};
 use serde_json::Value;
+use std::collections::HashMap;
+use std::env;
 use std::path::{Path, PathBuf};
 use std::process::Stdio;
 use std::time::Duration;
 use tokio::process::Command;
 use tokio::time::timeout;
 
+#[cfg(windows)]
+const PATH_SEP: &str = ";";
+#[cfg(not(windows))]
+const PATH_SEP: &str = ":";
+
 #[derive(Clone)]
 pub struct ScriptExecutor {
     base_dir: PathBuf,
+    extra_envs: HashMap<String, String>,
 }
 
 impl ScriptExecutor {
     pub fn new(base_dir: impl Into<PathBuf>) -> Self {
+        let base_dir = base_dir.into();
+        let extra_envs = build_default_envs(&base_dir);
         Self {
-            base_dir: base_dir.into(),
+            base_dir,
+            extra_envs,
         }
     }
 
+    pub fn with_envs(mut self, envs: HashMap<String, String>) -> Self {
+        self.extra_envs.extend(envs);
+        self
+    }
+
     pub async fn execute(
         &self,
         node: &ScriptNode,
@@ -35,9 +52,9 @@ impl ScriptExecutor {
         let state_repr = state_manager.serialize_state()?;
 
         let mut cmd = build_command(language, &script_path)?;
-        cmd.current_dir(&self.base_dir);
         cmd.stdout(Stdio::piped());
         cmd.stderr(Stdio::piped());
+        cmd.envs(&self.extra_envs);
         match &state_repr {
             StateRepresentation::Inline(json) => {
                 cmd.env("GRAPH_STATE", json);
@@ -111,6 +128,36 @@ fn apply_state_updates(node: &ScriptNode, state_manager: &mut StateManager) {
     }
 }
 
+fn build_default_envs(agent_data_dir: &Path) -> HashMap<String, String> {
+    let mut envs = HashMap::new();
+    envs.insert(
+        "LLM_ROOT_DIR".to_string(),
+        paths::config_dir().to_string_lossy().into_owned(),
+    );
+    envs.insert(
+        "LLM_PROMPT_UTILS_FILE".to_string(),
+        paths::bash_prompt_utils_file()
+            .to_string_lossy()
+            .into_owned(),
+    );
+    envs.insert(
+        "LLM_AGENT_DATA_DIR".to_string(),
+        agent_data_dir.to_string_lossy().into_owned(),
+    );
+    envs.insert("CLICOLOR_FORCE".to_string(), "1".to_string());
+    envs.insert("FORCE_COLOR".to_string(), "1".to_string());
+
+    if let Ok(current_path) = env::var("PATH") {
+        let bin_dir = paths::functions_bin_dir();
+        envs.insert(
+            "PATH".to_string(),
+            format!("{}{}{}", bin_dir.display(), PATH_SEP, current_path),
+        );
+    }
+
+    envs
+}
+
 fn detect_language(script_path: &Path) -> Result<Language> {
     let ext = script_path
         .extension()
diff --git a/src/graph/types.rs b/src/graph/types.rs
index 0341d82..aa0c72f 100644
--- a/src/graph/types.rs
+++ b/src/graph/types.rs
@@ -1,3 +1,4 @@
+use crate::config::AgentVariable;
 use anyhow::Result;
 use indexmap::IndexMap;
 use serde::{Deserialize, Serialize};
@@ -33,6 +34,9 @@ pub struct Graph {
     #[serde(default)]
     pub conversation_starters: Vec<String>,
 
+    #[serde(default)]
+    pub variables: Vec<AgentVariable>,
+
     #[serde(default)]
     pub settings: GraphSettings,
 
diff --git a/src/graph/validator.rs b/src/graph/validator.rs
index 09b7b37..ca4e749 100644
--- a/src/graph/validator.rs
+++ b/src/graph/validator.rs
@@ -848,6 +848,7 @@ mod tests {
             global_tools: Vec::new(),
             mcp_servers: Vec::new(),
             conversation_starters: Vec::new(),
+            variables: Vec::new(),
             settings: GraphSettings::default(),
             initial_state: HashMap::new(),
             reducers: HashMap::new(),