diff --git a/.github/workflows/debug-powershell-quoting.yml b/.github/workflows/debug-powershell-quoting.yml
new file mode 100644
index 0000000..34f67c9
--- /dev/null
+++ b/.github/workflows/debug-powershell-quoting.yml
@@ -0,0 +1,100 @@
+name: Debug PowerShell Quoting
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  debug-quoting:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+
+      - name: Install dependencies
+        run: |
+          pip install --upgrade pip
+          pip install -e .
+        shell: pwsh
+
+      - name: Test CLI accessibility
+        shell: pwsh
+        run: |
+          Write-Host "Testing basic CLI functionality..."
+          isic --help
+
+      - name: Test simple metadata query (no spaces)
+        shell: pwsh
+        run: |
+          Write-Host "Testing simple query without spaces..."
+          isic metadata download -s "age_approx:50" --limit 1
+
+      - name: Debug: Show what PowerShell passes for different quotes
+        shell: pwsh
+        run: |
+          Write-Host "=== PowerShell Quoting Debug ==="
+
+          # Test 1: Single quotes around the whole thing
+          $query1 = 'diagnosis_3:"Squamous cell carcinoma in situ"'
+          Write-Host "Query 1 (single quotes): '$query1'"
+          Write-Host "Length: $($query1.Length)"
+          Write-Host "Characters: $($query1.ToCharArray() -join ', ')"
+
+          # Test 2: Double quotes with escaped inner quotes
+          $query2 = "diagnosis_3:`"Squamous cell carcinoma in situ`""
+          Write-Host "Query 2 (backtick escape): `"$query2`""
+          Write-Host "Length: $($query2.Length)"
+          Write-Host "Characters: $($query2.ToCharArray() -join ', ')"
+
+          # Test 3: Double quotes inside single quotes
+          $query3 = 'diagnosis_3:""Squamous cell carcinoma in situ""'
+          Write-Host "Query 3 (doubled quotes): '$query3'"
+          Write-Host "Length: $($query3.Length)"
+          Write-Host "Characters: $($query3.ToCharArray() -join ', ')"
+
+      - name: Test each quoting style with verbose output
+        shell: pwsh
+        run: |
+          Write-Host "=== Testing actual commands ==="
+
+          Write-Host "`n1. Testing single quotes (Unix style):"
+          try {
+            isic metadata download -s 'diagnosis_3:"Squamous cell carcinoma in situ"' --limit 1 2>&1 | Tee-Object -Variable output1
+            Write-Host "EXIT CODE: $LASTEXITCODE"
+          } catch {
+            Write-Host "EXCEPTION: $($_.Exception.Message)"
+          }
+
+          Write-Host "`n2. Testing backtick escaping:"
+          try {
+            isic metadata download -s "diagnosis_3:`"Squamous cell carcinoma in situ`"" --limit 1 2>&1 | Tee-Object -Variable output2
+            Write-Host "EXIT CODE: $LASTEXITCODE"
+          } catch {
+            Write-Host "EXCEPTION: $($_.Exception.Message)"
+          }
+
+          Write-Host "`n3. Testing doubled quotes:"
+          try {
+            isic metadata download -s 'diagnosis_3:""Squamous cell carcinoma in situ""' --limit 1 2>&1 | Tee-Object -Variable output3
+            Write-Host "EXIT CODE: $LASTEXITCODE"
+          } catch {
+            Write-Host "EXCEPTION: $($_.Exception.Message)"
+          }
+
+      - name: Test with a known good diagnosis value
+        shell: pwsh
+        run: |
+          Write-Host "=== Testing with a simpler diagnosis value ==="
+
+          # Try with a value that might not have special characters
+          Write-Host "Testing with 'melanoma':"
+          try {
+            isic metadata download -s 'diagnosis_3:"melanoma"' --limit 1 2>&1
+            Write-Host "EXIT CODE: $LASTEXITCODE"
+          } catch {
+            Write-Host "EXCEPTION: $($_.Exception.Message)"
+          }
\ No newline at end of file
diff --git a/.github/workflows/powershell-quoting-test.yml b/.github/workflows/powershell-quoting-test.yml
new file mode 100644
index 0000000..bdf7ae8
--- /dev/null
+++ b/.github/workflows/powershell-quoting-test.yml
@@ -0,0 +1,132 @@
+name: PowerShell Quoting Test
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  test-powershell-quoting:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+
+      - name: Install dependencies
+        run: |
+          pip install --upgrade pip
+          pip install -e .
+        shell: pwsh
+
+      - name: Test Unix-style quoting (should fail in PowerShell)
+        id: unix-style
+        shell: pwsh
+        continue-on-error: true
+        run: |
+          Write-Host "Testing Unix-style quoting: 'diagnosis_3:`"Squamous cell carcinoma in situ`"'"
+          $query = 'diagnosis_3:"Squamous cell carcinoma in situ"'
+          Write-Host "PowerShell will pass: $query"
+          isic metadata download -s 'diagnosis_3:"Squamous cell carcinoma in situ"' --limit 1
+
+      - name: Test incorrect PowerShell quoting (should also fail)
+        id: incorrect-powershell
+        shell: pwsh
+        continue-on-error: true
+        run: |
+          # This is what users might try but still fails
+          isic metadata download -s "diagnosis_3:\"Squamous cell carcinoma in situ\"" --limit 1
+
+      - name: Test correct PowerShell quoting with doubled quotes
+        id: correct-powershell-doubled
+        shell: pwsh
+        continue-on-error: true
+        run: |
+          # This should work - doubled quotes inside single quotes
+          isic metadata download -s 'diagnosis_3:""Squamous cell carcinoma in situ""' --limit 1
+
+      - name: Test correct PowerShell quoting with backticks
+        id: correct-powershell-backticks
+        shell: pwsh
+        continue-on-error: true
+        run: |
+          # This should work - backtick escaping
+          isic metadata download -s "diagnosis_3:`"Squamous cell carcinoma in situ`"" --limit 1
+
+      - name: Test simple query without spaces (should always work)
+        id: simple-query
+        shell: pwsh
+        run: |
+          # This should always work regardless of shell
+          isic metadata download -s 'age_approx:50' --limit 1
+
+      - name: Analyze test results
+        shell: pwsh
+        run: |
+          Write-Host "=== Test Results Analysis ==="
+          Write-Host "Unix-style quoting outcome: ${{ steps.unix-style.outcome }}"
+          Write-Host "Incorrect PowerShell quoting outcome: ${{ steps.incorrect-powershell.outcome }}"
+          Write-Host "Correct PowerShell doubled quotes outcome: ${{ steps.correct-powershell-doubled.outcome }}"
+          Write-Host "Correct PowerShell backticks outcome: ${{ steps.correct-powershell-backticks.outcome }}"
+          Write-Host "Simple query outcome: ${{ steps.simple-query.outcome }}"
+
+          Write-Host ""
+          Write-Host "=== Analysis ==="
+
+          # Count successes and failures
+          $successes = @("${{ steps.unix-style.outcome }}", "${{ steps.incorrect-powershell.outcome }}", "${{ steps.correct-powershell-doubled.outcome }}", "${{ steps.correct-powershell-backticks.outcome }}", "${{ steps.simple-query.outcome }}") | Where-Object { $_ -eq "success" }
+          $failures = @("${{ steps.unix-style.outcome }}", "${{ steps.incorrect-powershell.outcome }}", "${{ steps.correct-powershell-doubled.outcome }}", "${{ steps.correct-powershell-backticks.outcome }}", "${{ steps.simple-query.outcome }}") | Where-Object { $_ -eq "failure" }
+
+          Write-Host "Total successes: $($successes.Count)"
+          Write-Host "Total failures: $($failures.Count)"
+
+          if ($successes.Count -eq 5) {
+            Write-Host "🔍 All commands succeeded - this suggests either:"
+            Write-Host "   1. PowerShell is handling all quoting styles correctly, OR"
+            Write-Host "   2. The search validation is not strict enough to catch quoting issues"
+            Write-Host "✅ This is actually good news - the quoting issue may not exist or be as severe as expected"
+          } elseif ($failures.Count -eq 5) {
+            Write-Host "❌ All commands failed - this suggests:"
+            Write-Host "   1. Network/authentication issues, OR"
+            Write-Host "   2. Invalid diagnosis value, OR"
+            Write-Host "   3. CLI installation problems"
+          } else {
+            Write-Host "📊 Mixed results - this is the expected behavior if there's a real quoting issue"
+            Write-Host "   - Some quoting styles work, others don't"
+          }
+
+          Write-Host ""
+          Write-Host "This test run provides valuable data about PowerShell quoting behavior."
+          Write-Host "All outcomes are informative and help us understand the real issue."
+
+  test-cmd-quoting:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+
+      - name: Install dependencies
+        run: |
+          pip install --upgrade pip
+          pip install -e .
+        shell: cmd
+
+      - name: Test quoting in Command Prompt
+        shell: cmd
+        run: |
+          REM Test basic quoting in cmd.exe
+          isic metadata download -s "diagnosis_3:\"Squamous cell carcinoma in situ\"" --limit 1
+
+      - name: Test simple query in Command Prompt
+        shell: cmd
+        run: |
+          isic metadata download -s "age_approx:50" --limit 1
\ No newline at end of file
diff --git a/test-diagnosis-values.sh b/test-diagnosis-values.sh
new file mode 100755
index 0000000..e38d1fb
--- /dev/null
+++ b/test-diagnosis-values.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+# Test script to verify valid diagnosis values
+
+echo "Testing various diagnosis values to find valid ones..."
+echo "============================================================"
+
+# Test simple values first
+echo "Testing simple age query:"
+isic metadata download -s 'age_approx:50' --limit 1
+
+echo
+echo "Testing diagnosis_3 with melanoma:"
+isic metadata download -s 'diagnosis_3:melanoma' --limit 1
+
+echo
+echo "Testing diagnosis_3 with quotes around melanoma:"
+isic metadata download -s 'diagnosis_3:"melanoma"' --limit 1
+
+echo
+echo "Testing if 'Squamous cell carcinoma in situ' is valid:"
+isic metadata download -s 'diagnosis_3:"Squamous cell carcinoma in situ"' --limit 1
+
+echo
+echo "Testing a different approach with diagnosis_2:"
+isic metadata download -s 'diagnosis_2:"Malignant melanocytic proliferations (Melanoma)"' --limit 1
+
+echo
+echo "Getting help to see example queries:"
+isic metadata download --help | grep -A 10 -B 10 diagnosis
\ No newline at end of file
diff --git a/test-powershell-quoting.ps1 b/test-powershell-quoting.ps1
new file mode 100644
index 0000000..14e14d0
--- /dev/null
+++ b/test-powershell-quoting.ps1
@@ -0,0 +1,56 @@
+# PowerShell script to test quoting behavior with isic-cli
+# Run this in PowerShell to see how different quoting styles behave
+
+Write-Host "Testing PowerShell quoting behavior with isic-cli" -ForegroundColor Green
+Write-Host "=" * 60
+
+# First test if CLI is accessible
+Write-Host "`nTesting CLI accessibility..." -ForegroundColor Cyan
+try {
+    $null = isic metadata download --help 2>&1
+    Write-Host "✅ CLI is accessible" -ForegroundColor Green
+} catch {
+    Write-Host "❌ CLI not accessible: $($_.Exception.Message)" -ForegroundColor Red
+    exit 1
+}
+
+# Test 1: Unix-style quoting - show what PowerShell passes to the program
+Write-Host "`nTest 1: Unix-style quoting 'diagnosis_3:`"Squamous cell carcinoma in situ`"'" -ForegroundColor Yellow
+$query1 = 'diagnosis_3:"Squamous cell carcinoma in situ"'
+Write-Host "PowerShell will pass this string to isic: $query1"
+Write-Host "Command: isic metadata download --limit 1 (with -s '$query1')"
+
+# Test 2: Incorrect PowerShell quoting
+Write-Host "`nTest 2: Incorrect PowerShell quoting `"diagnosis_3:\`"Squamous cell carcinoma in situ\`"`"" -ForegroundColor Yellow
+$query2 = "diagnosis_3:`"Squamous cell carcinoma in situ`""
+Write-Host "PowerShell will pass this string to isic: $query2"
+Write-Host "Command: isic metadata download --limit 1 (with -s `"$query2`")"
+
+# Test 3: Correct PowerShell quoting with doubled quotes
+Write-Host "`nTest 3: Correct PowerShell doubled quotes 'diagnosis_3:`"`"Squamous cell carcinoma in situ`"`"'" -ForegroundColor Yellow
+$query3 = 'diagnosis_3:""Squamous cell carcinoma in situ""'
+Write-Host "PowerShell will pass this string to isic: $query3"
+Write-Host "Command: isic metadata download --limit 1 (with -s '$query3')"
+
+# Test 4: Correct PowerShell quoting with backticks
+Write-Host "`nTest 4: Correct PowerShell backticks `"diagnosis_3:\`"Squamous cell carcinoma in situ\`"`"" -ForegroundColor Yellow
+$query4 = "diagnosis_3:`"Squamous cell carcinoma in situ`""
+Write-Host "PowerShell will pass this string to isic: $query4"
+Write-Host "Command: isic metadata download --limit 1 (with -s `"$query4`")"
+
+# Test 5: Simple query without spaces
+Write-Host "`nTest 5: Simple query 'age_approx:50'" -ForegroundColor Yellow
+$query5 = 'age_approx:50'
+Write-Host "PowerShell will pass this string to isic: $query5"
+Write-Host "Command: isic metadata download --help (with -s '$query5')"
+
+Write-Host "`n" + "=" * 60
+Write-Host "Analysis:" -ForegroundColor Cyan
+Write-Host "- Test 1 passes: $query1" -ForegroundColor White
+Write-Host "- Test 2 passes: $query2" -ForegroundColor White
+Write-Host "- Test 3 passes: $query3" -ForegroundColor White
+Write-Host "- Test 4 passes: $query4" -ForegroundColor White
+Write-Host "- Test 5 passes: $query5" -ForegroundColor White
+Write-Host ""
+Write-Host "The issue occurs when the CLI validates these strings against the ISIC API." -ForegroundColor Yellow
+Write-Host "For actual testing, use the GitHub Actions workflow which connects to the API." -ForegroundColor Yellow
\ No newline at end of file
diff --git a/test-unix-quoting.sh b/test-unix-quoting.sh
new file mode 100755
index 0000000..22aa881
--- /dev/null
+++ b/test-unix-quoting.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+# Bash script to test quoting behavior with isic-cli on Unix systems
+# Run this in bash/zsh to see how quoting works on Unix
+
+echo "Testing Unix/Linux quoting behavior with isic-cli"
+echo "============================================================"
+
+# Test 1: Standard Unix quoting - test with actual API call
+echo
+echo "Test 1: Standard Unix quoting 'diagnosis_3:\"Squamous cell carcinoma in situ\"'"
+echo "Command: isic metadata download -s 'diagnosis_3:\"Squamous cell carcinoma in situ\"' --limit 1"
+if isic metadata download -s 'diagnosis_3:"Squamous cell carcinoma in situ"' --limit 1 > /dev/null 2>&1; then
+    echo "Result: SUCCESS"
+else
+    echo "Result: FAILED"
+fi
+
+# Test 2: Double-quoted with escaped quotes
+echo
+echo "Test 2: Double-quoted with escapes \"diagnosis_3:\\\"Squamous cell carcinoma in situ\\\"\""
+echo "Command: isic metadata download -s \"diagnosis_3:\\\"Squamous cell carcinoma in situ\\\"\" --limit 1"
+if isic metadata download -s "diagnosis_3:\"Squamous cell carcinoma in situ\"" --limit 1 > /dev/null 2>&1; then
+    echo "Result: SUCCESS"
+else
+    echo "Result: FAILED"
+fi
+
+# Test 3: Simple query without spaces
+echo
+echo "Test 3: Simple query 'age_approx:50'"
+echo "Command: isic metadata download -s 'age_approx:50' --limit 1"
+if isic metadata download -s 'age_approx:50' --limit 1 > /dev/null 2>&1; then
+    echo "Result: SUCCESS"
+else
+    echo "Result: FAILED"
+fi
+
+echo
+echo "============================================================"
+echo "Expected behavior on Unix/Linux:"
+echo "- All tests should SUCCESS (standard quoting works fine)"
+echo "If any test fails, it may be due to network issues or API availability."
\ No newline at end of file