diff --git a/.Rbuildignore b/.Rbuildignore
index 7856c9b..5234e54 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -2,3 +2,4 @@
 ^\.Rproj\.user$
 .*~
 ^\.circleci/config\.yml$
+.github
diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
new file mode 100644
index 0000000..16819b3
--- /dev/null
+++ b/.github/copilot-instructions.md
@@ -0,0 +1,94 @@
+## Code Review Guidelines
+
+### R Package Standards
+- This is a standard R package - all changes must maintain CRAN-compatible structure
+- NAMESPACE is auto-generated by roxygen2 - never edit it directly
+- DESCRIPTION must be kept valid with proper versioning
+- All exported functions require complete roxygen2 documentation
+
+### Code Style Requirements
+- **Naming conventions**: Use `dotted.case`, `camelCase`, or `PascalCase` consistently
+  - Parameters/variables: `dotted.case` (e.g., `response.format`, `text.variables`, `api.key`)
+  - Functions: `camelCase` or `PascalCase` or `.camelCase` (e.g., `checkInputs`, `MakeOutput`, or `.nestedHelper`)
+    - Use `PascalCase` for exported functions (e.g., `AddFormulaBars`, `RegressionTable`)
+    - Use `camelCase` for internal/helper functions (e.g., `checkInputs`)
+    - Use `.camelCase` for internal nested functions
+    e.g., within an internal function
+    ```
+    addOneToAll <- function(x) {
+        .helpAdd <- function(y) {
+            y + 1
+        }
+        vapply(x, .helpAdd, numeric(1L)
+    }
+    ```
+- **Object name length**: Maximum 50 characters
+- **Assignment**: Always use `<-` for assignment, never `=`
+- **Pipes**: Use native pipe `|>` for chaining operations
+- **NULL coalescing**: Use `%||%` operator for NULL defaults
+- **Indentation**: 4 spaces
+- **Line length**: Maximum 120 characters
+- **No trailing whitespace**
+- **Consistent quotes**: Always use double quotes `"` for strings. It is ok for quotes within strings to be single quotes `'` but the parent string must use double quotes.
+- **Prefer full words over abbreviations**: e.g., `response.format` over `resp.fmt`
+- **Function names**: Use descriptive names that clearly indicate purpose: e.g. `createSummaryTableForRegressionResults()` rather than `make()`
+- **Braces**: Always use braces `{}` for functions, `if`, `else if` and `else` blocks. Except for the case of a single line statements. In particular, use Kernighan & Ritchie style braces.
+    - e.g. The following is acceptable:
+    ```
+    y <- if (x > 0) x else -x
+    w <- if (condition) {
+        z <- computeSomething(x)
+        foo(z)
+    } else {
+        z <- computeSomethingElse(x)
+        bar(z)
+    }
+    ```
+- **Redundant return**: Avoid using `return()` unless exiting early from a function. The last evaluated expression is returned by default.
+
+### Function Design Patterns
+- **Error handling**: Use `flipU::StopForUserError()` for user-facing errors with clear, actionable messages
+- **Return values**: Functions used for validation/side effects should explicitly return `NULL`
+- **Internal functions**: Internal or helper functions should not be exported; use `@noRd` in roxygen comments
+- **File organization**: Group related functions into logical files (e.g., check.inputs.R, tidy.inputs.R)
+- **Importing functions**: Use `@importFrom` in roxygen comments for all external package functions used and avoid usage of `:::`.
+- **Type checking**: Don't use `sapply`. Use `vapply` with a specified return type for type safety.
+- **Formatting numbers for printing**: Use `flipFormat::FormatAsReal()` and `flipFormat::FormatAsPercent()` instead of base R formatting functions
+- **Calculations**: Use the following functions where possible:
+    - `verbs::Average` instead of `mean`
+    - `verbs::Sum` instead of `sum`
+    - `verbs::Min` instead of `min`
+    - `verbs::Max` instead of `max`
+    - `verbs::Variance` instead of `var`
+    - `verbs::StandardDeviation` instead of `sd`
+
+### Documentation Requirements
+- All exported functions must have complete roxygen2 documentation
+- Required tags: `@param` (for each parameter), `@return`, `@export`
+- Include `@importFrom` for all external package functions used
+- Optional but recommended: `@details`, `@examples`
+
+### Testing Requirements
+- Use testthat v3 framework (edition 3)
+- Test files must be in `tests/testthat/` with `test-` prefix
+- Include snapshot tests where appropriate (`_snaps/` directory)
+
+### Security & Best Practices
+- **Never log or expose API keys or secrets**
+
+## PR Review Focus Areas
+1. **Breaking changes**: Flag any changes to exported function signatures
+2. **Documentation**: Ensure all new/modified exports have complete roxygen2 docs
+3. **Testing**: Verify new functionality has corresponding tests
+4. **Style consistency**: Check adherence to naming convetions, `<-`, `|>` patterns
+5. **Error messages**: Ensure user-facing errors are clear and helpful
+6. **Line length**: Flag lines exceeding 120 characters
+7. **Object names**: Ensure names don't exceed 50 characters
+
+## Common Issues to Flag
+- Using `=` instead of `<-` for assignment
+- Missing or incomplete roxygen2 documentation
+- Direct API key exposure or logging
+- Inconsistent naming conventions (mixing dotted.case/camelCase inappropriately)
+- New dependencies without justification
+- Error messages that don't guide users to solutions
diff --git a/.github/workflows/check-copilot-instructions.yml b/.github/workflows/check-copilot-instructions.yml
new file mode 100644
index 0000000..613da82
--- /dev/null
+++ b/.github/workflows/check-copilot-instructions.yml
@@ -0,0 +1,119 @@
+name: Check Copilot Instructions Sync
+
+on:
+  pull_request:
+    branches: '*'
+
+jobs:
+  check-copilot-instructions:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout current repository
+      uses: actions/checkout@v4
+
+    - name: Download copilot-instructions.md from flipU
+      id: download-source
+      run: |
+        echo "Downloading copilot-instructions.md from flipU..."
+
+        # Try multiple possible paths for the copilot instructions
+        POSSIBLE_PATHS=(
+          ".github/copilot-instructions.md"
+          "copilot-instructions.md"
+          ".github/copilot_instructions.md"
+          "docs/copilot-instructions.md"
+        )
+
+        DOWNLOADED=false
+        for path in "${POSSIBLE_PATHS[@]}"; do
+          echo "Trying path: $path"
+          if curl -s -H "Accept: application/vnd.github.v3.raw" \
+                  -o /tmp/source-copilot-instructions.md \
+                  "https://api.github.com/repos/Displayr/flipU/contents/$path" 2>/dev/null; then
+
+            # Check if we got actual content (not an error response)
+            if [ -f /tmp/source-copilot-instructions.md ] && [ -s /tmp/source-copilot-instructions.md ]; then
+              # Verify it's not a JSON error response
+              if ! grep -q '"message".*"Not Found"' /tmp/source-copilot-instructions.md; then
+                echo "✅ Successfully downloaded from: $path"
+                echo "source_path=$path" >> $GITHUB_OUTPUT
+                DOWNLOADED=true
+                break
+              fi
+            fi
+          fi
+        done
+
+        if [ "$DOWNLOADED" = false ]; then
+          echo "❌ Could not find copilot-instructions.md in flipU repo"
+          echo "This may indicate the file doesn't exist or has been moved."
+          echo "Please check the flipU repository structure."
+          exit 1
+        fi
+
+    - name: Check if local copilot-instructions.md exists
+      id: check-local
+      run: |
+        if [ ! -f .github/copilot-instructions.md ]; then
+          echo "❌ No copilot-instructions.md found in this repository"
+          echo "Expected location: .github/copilot-instructions.md"
+          echo "exists=false" >> $GITHUB_OUTPUT
+          exit 1
+        else
+          echo "✅ Found local copilot-instructions.md"
+          echo "exists=true" >> $GITHUB_OUTPUT
+        fi
+
+    - name: Compare files
+      run: |
+        echo "Comparing copilot-instructions.md files..."
+        echo "Source: flipU/${{ steps.download-source.outputs.source_path }}"
+        echo "Local: .github/copilot-instructions.md"
+        echo ""
+
+        # Compare the files
+        if diff -u /tmp/source-copilot-instructions.md .github/copilot-instructions.md > /tmp/diff_output; then
+          echo "✅ Files match perfectly!"
+          echo "Your copilot-instructions.md is up to date with flipU."
+        else
+          echo "❌ Files do not match!"
+          echo ""
+          echo "Differences found:"
+          echo "=================="
+          cat /tmp/diff_output
+          echo "=================="
+          echo ""
+          echo "To fix this issue:"
+          echo "1. Update your .github/copilot-instructions.md to match the source"
+          echo "2. Or run the shell script in flipU to do this for you."
+          echo "   # Run these commands locally from the root of your repository"
+          echo "   > curl -O -L https://raw.githubusercontent.com/Displayr/flipU/master/.github/update-copilot-instructions.sh"
+          echo "   > bash update-copilot-instructions.sh"
+          echo "   > git add .github/copilot-instructions.md"
+          echo "   > git commit -m 'Update copilot-instructions.md to match flipU'"
+          echo "   > git push"
+          echo "Source file location: flipU/${{ steps.download-source.outputs.source_path }}"
+          exit 1
+        fi
+
+    - name: Verify file integrity
+      run: |
+        echo "Verifying file integrity..."
+
+        # Check that the local file is not empty
+        if [ ! -s .github/copilot-instructions.md ]; then
+          echo "❌ Local copilot-instructions.md is empty"
+          exit 1
+        fi
+
+        # Check that it contains expected content patterns
+        if ! grep -q -i "copilot\|instruction\|coding\|standard" .github/copilot-instructions.md; then
+          echo "⚠️  Warning: File doesn't seem to contain typical copilot instruction content"
+          echo "Please verify the file contains the expected coding standards and instructions"
+        else
+          echo "✅ File appears to contain valid copilot instructions"
+        fi
+
+        echo "File size: $(wc -c < .github/copilot-instructions.md) bytes"
+        echo "Line count: $(wc -l < .github/copilot-instructions.md) lines"