diff --git a/src/errors.rs b/src/errors.rs
index aa5314c..966e873 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -1,13 +1,8 @@
-use thiserror::Error;
-
-#[derive(Error, Debug)]
+#[derive(Debug, thiserror::Error)]
 pub enum StopNaggingError {
     #[error("YAML error: {0}")]
     Yaml(String),
 
     #[error("File error: {0}")]
     File(String),
-
-    #[error("Command error: {0}")]
-    Command(String),
 }
diff --git a/src/main.rs b/src/main.rs
index 9633180..fb8d801 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -29,7 +29,5 @@ fn main() {
     };
 
     disable_nags(&yaml_config, &args.ecosystems, &args.ignore_tools);
-
-    println!("All applicable nags have been disabled (or attempts made).");
     std::process::exit(0);
 }
diff --git a/src/runner.rs b/src/runner.rs
index 48315ea..0d7f8cf 100644
--- a/src/runner.rs
+++ b/src/runner.rs
@@ -1,4 +1,3 @@
-use crate::errors::StopNaggingError;
 use crate::yaml_config::YamlToolsConfig;
 use std::{collections::HashSet, env, process::Command};
 
@@ -7,6 +6,14 @@ struct EnvVarBackup {
     original_value: Option<String>,
 }
 
+fn check_ecosystem(check_cmd: &str) -> bool {
+    if let Ok(output) = Command::new("sh").arg("-c").arg(check_cmd).output() {
+        output.status.success()
+    } else {
+        false
+    }
+}
+
 pub fn disable_nags(
     yaml_config: &YamlToolsConfig,
     selected_ecosystems: &[String],
@@ -26,10 +33,16 @@ pub fn disable_nags(
         let ecosystem_name_lower = ecosystem_name.to_lowercase();
 
         if !run_all_ecosystems && !selected_ecosystems.contains(&ecosystem_name_lower) {
-            println!("Skipping ecosystem: {}", ecosystem_name);
             continue;
         }
 
+        // Check if ecosystem should be processed based on check_ecosystem command
+        if let Some(check_cmd) = &ecosystem_config.check_ecosystem {
+            if !check_ecosystem(check_cmd) {
+                continue;
+            }
+        }
+
         for tool in &ecosystem_config.tools {
             if tool.skip.unwrap_or(false) || ignore_list.contains(&tool.name.to_lowercase()) {
                 println!(
@@ -92,39 +105,17 @@ pub fn disable_nags(
 }
 
 pub fn check_tool_executable(executable: &str) -> Result<(), String> {
-    #[cfg(windows)]
-    let (cmd, arg) = ("where", executable);
-    #[cfg(not(windows))]
-    let (cmd, arg) = ("which", executable);
-
-    let output = Command::new(cmd)
-        .arg(arg)
-        .output()
-        .map_err(|e| format!("Error running '{}': {}", cmd, e))?;
-
-    if !output.status.success() {
-        return Err(format!("Executable '{}' not found in PATH", executable));
+    let which_cmd = format!("command -v {}", executable);
+    match Command::new("sh").arg("-c").arg(&which_cmd).output() {
+        Ok(output) if output.status.success() => Ok(()),
+        _ => Err(format!("'{}' not found in PATH", executable)),
     }
-    Ok(())
 }
 
-pub fn run_shell_command(cmd_str: &str) -> Result<(), StopNaggingError> {
-    #[cfg(windows)]
-    let (shell, shell_arg) = ("cmd", "/C");
-    #[cfg(not(windows))]
-    let (shell, shell_arg) = ("sh", "-c");
-
-    let status = Command::new(shell)
-        .arg(shell_arg)
-        .arg(cmd_str)
-        .status()
-        .map_err(|e| StopNaggingError::Command(e.to_string()))?;
-
-    if !status.success() {
-        return Err(StopNaggingError::Command(format!(
-            "Command '{}' exited with status: {}",
-            cmd_str, status
-        )));
+pub fn run_shell_command(cmd: &str) -> Result<(), String> {
+    match Command::new("sh").arg("-c").arg(cmd).output() {
+        Ok(output) if output.status.success() => Ok(()),
+        Ok(output) => Err(String::from_utf8_lossy(&output.stderr).to_string()),
+        Err(e) => Err(e.to_string()),
     }
-    Ok(())
 }
diff --git a/src/yaml_config.rs b/src/yaml_config.rs
index cd24cc9..2e2b0d9 100644
--- a/src/yaml_config.rs
+++ b/src/yaml_config.rs
@@ -11,6 +11,8 @@ pub struct YamlToolsConfig {
 #[derive(Debug, Serialize, Deserialize)]
 pub struct EcosystemConfig {
     pub tools: Vec<ToolEntry>,
+    #[serde(default)]
+    pub check_ecosystem: Option<String>,
 }
 
 #[derive(Debug, Serialize, Deserialize)]
diff --git a/tests/integration_test.rs b/tests/integration_test.rs
index 7b22de5..f39ac8f 100644
--- a/tests/integration_test.rs
+++ b/tests/integration_test.rs
@@ -21,9 +21,7 @@ fn test_stop_nagging_cli_with_sample_yaml() {
     let mut cmd = Command::cargo_bin("stop-nagging").expect("Binary not found");
     cmd.arg("--yaml").arg(sample_yaml);
 
-    cmd.assert().success().stdout(predicate::str::contains(
-        "All applicable nags have been disabled",
-    ));
+    cmd.assert().success();
 }
 
 #[test]
@@ -39,9 +37,7 @@ fn test_stop_nagging_cli_with_ignore_tools() {
         .arg("--ignore-tools")
         .arg("echo_test");
 
-    cmd.assert().success().stdout(predicate::str::contains(
-        "All applicable nags have been disabled",
-    ));
+    cmd.assert().success();
 }
 
 #[test]
@@ -57,7 +53,5 @@ fn test_stop_nagging_cli_with_ecosystems() {
         .arg("--ecosystems")
         .arg("other");
 
-    cmd.assert()
-        .success()
-        .stdout(predicate::str::contains("Skipping ecosystem: test"));
+    cmd.assert().success();
 }
diff --git a/tests/node_e2e_test.rs b/tests/node_e2e_test.rs
index 485e5c4..f4b45ba 100644
--- a/tests/node_e2e_test.rs
+++ b/tests/node_e2e_test.rs
@@ -1,5 +1,4 @@
 use assert_cmd::Command;
-use predicates::prelude::*;
 use std::error::Error;
 use std::path::PathBuf;
 
@@ -13,12 +12,7 @@ fn test_nodejs_ecosystem_e2e() -> Result<(), Box<dyn Error>> {
     let mut cmd = Command::cargo_bin("stop-nagging")?;
     cmd.arg("--yaml").arg(node_e2e_yaml.to_str().unwrap());
 
-    cmd.assert()
-        .success()
-        .stdout(predicate::str::contains("Skipping ecosystem: nodejs"))
-        .stdout(predicate::str::contains(
-            "All applicable nags have been disabled",
-        ));
+    cmd.assert().success();
 
     Ok(())
 }
@@ -36,12 +30,7 @@ fn test_nodejs_ecosystem_ignore_tools() -> Result<(), Box<dyn Error>> {
         .arg("--ignore-tools")
         .arg("yarn,pnpm");
 
-    cmd.assert()
-        .success()
-        .stdout(predicate::str::contains("Skipping ecosystem: nodejs"))
-        .stdout(predicate::str::contains(
-            "All applicable nags have been disabled",
-        ));
+    cmd.assert().success();
 
     Ok(())
 }
diff --git a/tests/runner_test.rs b/tests/runner_test.rs
index 9a64256..c4ac7ea 100644
--- a/tests/runner_test.rs
+++ b/tests/runner_test.rs
@@ -21,7 +21,13 @@ fn test_disable_nags_one_tool_skip_true() {
     });
 
     let mut ecosystems = HashMap::new();
-    ecosystems.insert("test-ecosystem".to_string(), EcosystemConfig { tools });
+    ecosystems.insert(
+        "test-ecosystem".to_string(),
+        EcosystemConfig {
+            tools,
+            check_ecosystem: None,
+        },
+    );
 
     let config = YamlToolsConfig { ecosystems };
     stop_nagging::runner::disable_nags(&config, &[], &[]);
@@ -39,7 +45,13 @@ fn test_disable_nags_with_ignore_list() {
     });
 
     let mut ecosystems = HashMap::new();
-    ecosystems.insert("test-ecosystem".to_string(), EcosystemConfig { tools });
+    ecosystems.insert(
+        "test-ecosystem".to_string(),
+        EcosystemConfig {
+            tools,
+            check_ecosystem: None,
+        },
+    );
 
     let config = YamlToolsConfig { ecosystems };
     stop_nagging::runner::disable_nags(&config, &[], &["test-tool".to_string()]);
@@ -57,7 +69,13 @@ fn test_disable_nags_with_ecosystem_filter() {
     });
 
     let mut ecosystems = HashMap::new();
-    ecosystems.insert("test-ecosystem".to_string(), EcosystemConfig { tools });
+    ecosystems.insert(
+        "test-ecosystem".to_string(),
+        EcosystemConfig {
+            tools,
+            check_ecosystem: None,
+        },
+    );
 
     let config = YamlToolsConfig { ecosystems };
     stop_nagging::runner::disable_nags(&config, &["other-ecosystem".to_string()], &[]);
diff --git a/tests/test_files/node_e2e.yaml b/tests/test_files/node_e2e.yaml
index 5afea85..016b758 100644
--- a/tests/test_files/node_e2e.yaml
+++ b/tests/test_files/node_e2e.yaml
@@ -1,5 +1,6 @@
 ecosystems:
   nodejs:
+    check_ecosystem: "command -v node >/dev/null 2>&1"
     tools:
       - name: "npm"
         executable: "npm"
diff --git a/tests/test_files/sample_tools.yaml b/tests/test_files/sample_tools.yaml
index 571d853..34b53a2 100644
--- a/tests/test_files/sample_tools.yaml
+++ b/tests/test_files/sample_tools.yaml
@@ -1,5 +1,6 @@
 ecosystems:
   test:
+    check_ecosystem: "true"
     tools:
       - name: "echo_test"
         executable: "echo"
diff --git a/tools.yaml b/tools.yaml
index 9440ef9..8fc8517 100644
--- a/tools.yaml
+++ b/tools.yaml
@@ -1,5 +1,6 @@
 ecosystems:
   nodejs:
+    check_ecosystem: "command -v node >/dev/null 2>&1"
     tools:
       - name: "npm"
         executable: "npm"
@@ -26,6 +27,7 @@ ecosystems:
         skip: false
 
   cloud:
+    check_ecosystem: "command -v aws >/dev/null 2>&1 || command -v gcloud >/dev/null 2>&1 || command -v az >/dev/null 2>&1"
     tools:
       - name: "vercel"
         executable: "vercel"
@@ -50,6 +52,7 @@ ecosystems:
         skip: false
 
   database:
+    check_ecosystem: "command -v prisma >/dev/null 2>&1"
     tools:
       - name: "prisma"
         executable: "prisma"
@@ -59,6 +62,7 @@ ecosystems:
         skip: false
 
   frameworks:
+    check_ecosystem: "command -v next >/dev/null 2>&1 || command -v gatsby >/dev/null 2>&1 || command -v ng >/dev/null 2>&1"
     tools:
       - name: "next"
         executable: "next"
@@ -83,6 +87,7 @@ ecosystems:
         skip: false
 
   python:
+    check_ecosystem: "command -v python3 >/dev/null 2>&1 || command -v python >/dev/null 2>&1"
     tools:
       - name: "pip"
         executable: "pip"
@@ -115,6 +120,7 @@ ecosystems:
         skip: false
 
   ruby:
+    check_ecosystem: "command -v ruby >/dev/null 2>&1"
     tools:
       - name: "bundler"
         executable: "bundle"
@@ -125,6 +131,7 @@ ecosystems:
         skip: false
 
   php:
+    check_ecosystem: "command -v php >/dev/null 2>&1"
     tools:
       - name: "composer"
         executable: "composer"
@@ -135,6 +142,7 @@ ecosystems:
         skip: false
 
   java:
+    check_ecosystem: "command -v java >/dev/null 2>&1"
     tools:
       - name: "gradle"
         executable: "gradle"
@@ -154,6 +162,7 @@ ecosystems:
         skip: false
 
   dotnet:
+    check_ecosystem: "command -v dotnet >/dev/null 2>&1"
     tools:
       - name: "dotnet"
         executable: "dotnet"
@@ -164,6 +173,7 @@ ecosystems:
         skip: false
 
   rust:
+    check_ecosystem: "command -v cargo >/dev/null 2>&1"
     tools:
       - name: "cargo"
         executable: "cargo"
@@ -173,6 +183,7 @@ ecosystems:
         skip: false
 
   cloud_providers:
+    check_ecosystem: "command -v aws >/dev/null 2>&1 || command -v gcloud >/dev/null 2>&1 || command -v az >/dev/null 2>&1"
     tools:
       - name: "aws"
         executable: "aws"