diff --git a/bin/commands/issue.js b/bin/commands/issue.js
index 4fd15d9..05a07d1 100644
--- a/bin/commands/issue.js
+++ b/bin/commands/issue.js
@@ -398,7 +398,7 @@ async function getIssue(client, io, issueKey, options = {}) {
       const markdown = formatIssueAsMarkdown(issue);
       io.out('\n' + markdown);
     } else {
-      displayIssueDetails(issue);
+      displayIssueDetails(issue, io);
     }
 
   } catch (err) {
diff --git a/lib/utils.js b/lib/utils.js
index db5cc80..78ad207 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -233,31 +233,31 @@ function formatIssueAsMarkdown(issue) {
 }
 
 // Display issue details
-function displayIssueDetails(issue) {
+function displayIssueDetails(issue, io) {
   if (!issue || !issue.fields) {
     throw new Error('Unexpected API response: issue fields missing. Try setting API version with: jira config --api-version 2');
   }
-  console.log(chalk.bold(`\n${issue.key}: ${issue.fields.summary}`));
-  console.log(chalk.gray('─'.repeat(60)));
+  io.println(chalk.bold(`\n${issue.key}: ${issue.fields.summary}`));
+  io.println(chalk.gray('─'.repeat(60)));
 
-  console.log(`${chalk.bold('Status:')} ${chalk.yellow(issue.fields.status.name)}`);
-  console.log(`${chalk.bold('Type:')} ${issue.fields.issuetype.name}`);
-  console.log(`${chalk.bold('Priority:')} ${issue.fields.priority ? issue.fields.priority.name : 'N/A'}`);
-  console.log(`${chalk.bold('Assignee:')} ${issue.fields.assignee ? issue.fields.assignee.displayName : 'Unassigned'}`);
-  console.log(`${chalk.bold('Reporter:')} ${issue.fields.reporter ? issue.fields.reporter.displayName : 'N/A'}`);
-  console.log(`${chalk.bold('Created:')} ${formatDate(issue.fields.created)}`);
-  console.log(`${chalk.bold('Updated:')} ${formatDate(issue.fields.updated)}`);
+  io.println(`${chalk.bold('Status:')} ${chalk.yellow(issue.fields.status.name)}`);
+  io.println(`${chalk.bold('Type:')} ${issue.fields.issuetype.name}`);
+  io.println(`${chalk.bold('Priority:')} ${issue.fields.priority ? issue.fields.priority.name : 'N/A'}`);
+  io.println(`${chalk.bold('Assignee:')} ${issue.fields.assignee ? issue.fields.assignee.displayName : 'Unassigned'}`);
+  io.println(`${chalk.bold('Reporter:')} ${issue.fields.reporter ? issue.fields.reporter.displayName : 'N/A'}`);
+  io.println(`${chalk.bold('Created:')} ${formatDate(issue.fields.created)}`);
+  io.println(`${chalk.bold('Updated:')} ${formatDate(issue.fields.updated)}`);
 
   if (issue.fields.description) {
-    console.log(`\n${chalk.bold('Description:')}`);
-    console.log(resolveDescription(issue.fields.description));
+    io.println(`\n${chalk.bold('Description:')}`);
+    io.println(resolveDescription(issue.fields.description));
   }
 
   if (issue.fields.labels && issue.fields.labels.length > 0) {
-    console.log(`\n${chalk.bold('Labels:')} ${issue.fields.labels.join(', ')}`);
+    io.println(`\n${chalk.bold('Labels:')} ${issue.fields.labels.join(', ')}`);
   }
 
-  console.log(`\n${chalk.bold('URL:')} ${issue.self.replace(new RegExp(`/rest/api/(2|3)/issue/${issue.id}`), '/browse/' + issue.key)}`);
+  io.println(`\n${chalk.bold('URL:')} ${issue.self.replace(new RegExp(`/rest/api/(2|3)/issue/${issue.id}`), '/browse/' + issue.key)}`);
 }
 
 // Escape a value for safe use inside a JQL double-quoted string literal.
@@ -396,26 +396,6 @@ function buildJQL(options) {
   return base || 'ORDER BY updated DESC';
 }
 
-// Success message
-function success(message) {
-  console.log(chalk.green('✓'), message);
-}
-
-// Error message
-function error(message) {
-  console.error(chalk.red('✗'), message);
-}
-
-// Warning message
-function warning(message) {
-  console.log(chalk.yellow('⚠'), message);
-}
-
-// Info message
-function info(message) {
-  console.log(chalk.blue('ℹ'), message);
-}
-
 // Create table for comments
 function createCommentsTable(comments) {
   const table = new Table({
@@ -474,23 +454,6 @@ function createRemoteLinksTable(remoteLinks) {
   return table;
 }
 
-// Display single comment details
-function displayCommentDetails(comment) {
-  console.log(chalk.bold(`\nComment ID: ${comment.id}`));
-  console.log(chalk.gray('─'.repeat(60)));
-  console.log(`${chalk.bold('Author:')} ${comment.author ? comment.author.displayName : 'Unknown'}`);
-  console.log(`${chalk.bold('Created:')} ${formatDate(comment.created)}`);
-  console.log(`${chalk.bold('Updated:')} ${formatDate(comment.updated)}`);
-  
-  if (comment.visibility) {
-    console.log(`${chalk.bold('Visibility:')} ${comment.visibility.type} - ${comment.visibility.value}`);
-  }
-  
-  console.log(`\n${chalk.bold('Body:')}`);
-  console.log(comment.body || 'No content');
-  console.log('');
-}
-
 module.exports = {
   formatDate,
   formatIssueForTable,
@@ -501,13 +464,8 @@ module.exports = {
   formatIssueAsMarkdown,
   buildJQL,
   escapeJqlString,
-  success,
-  error,
-  warning,
-  info,
   createCommentsTable,
   createRemoteLinksTable,
-  displayCommentDetails,
   convertAdfToText,
   resolveDescription,
   expandHomePath
diff --git a/tests/utils.test.js b/tests/utils.test.js
index 9426f74..f7278cc 100644
--- a/tests/utils.test.js
+++ b/tests/utils.test.js
@@ -257,6 +257,47 @@ describe('Utils', () => {
     });
   });
 
+  describe('displayIssueDetails', () => {
+    function createIo() {
+      const lines = [];
+      return {
+        lines,
+        println: (msg = '') => lines.push(msg)
+      };
+    }
+
+    const baseIssue = {
+      key: 'TEST-1',
+      id: '10001',
+      self: 'https://jira.example.com/rest/api/3/issue/10001',
+      fields: {
+        summary: 'Sample',
+        status: { name: 'Open' },
+        issuetype: { name: 'Bug' },
+        priority: { name: 'High' },
+        assignee: { displayName: 'John' },
+        reporter: { displayName: 'Jane' },
+        created: '2024-01-01T00:00:00.000Z',
+        updated: '2024-01-02T00:00:00.000Z'
+      }
+    };
+
+    it('should write to the provided IOStreams instead of console', () => {
+      const io = createIo();
+      Utils.displayIssueDetails(baseIssue, io);
+      const output = io.lines.join('\n');
+      expect(output).toContain('TEST-1');
+      expect(output).toContain('Sample');
+      expect(output).toContain('Open');
+      expect(output).toContain('/browse/TEST-1');
+    });
+
+    it('should throw if issue fields are missing', () => {
+      const io = createIo();
+      expect(() => Utils.displayIssueDetails({}, io)).toThrow(/issue fields missing/);
+    });
+  });
+
   describe('formatIssueAsMarkdown with ADF description', () => {
     it('should render ADF description as text instead of [object Object]', () => {
       const issue = {