LorenFrankLab
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+# Claude Code Hooks for Safe Scientific Development
+
+This directory contains hooks that provide technical enforcement of safety requirements for the `non_local_detector` project.
+
+## Hook Overview
+
+Hooks automatically intercept commands and verify safety requirements before execution. They provide the first layer of defense in the three-layer system (hooks + skills + documentation).
+
+## Available Hooks
+
+### pre-tool-use.sh
+**Triggers:** Before every Bash tool execution
+
+**Enforces:**
+1. **Conda environment validation**
+   - Warns if Python commands run outside `non_local_detector` environment
+   - Suggests activation command
+   - Auto-prepends activation to commands
+
+2. **Test-before-commit**
+   - Checks if tests have run recently before allowing commits
+   - Warns if no test cache found
+   - Recommends running test suite
+
+3. **Snapshot update protection**
+   - Blocks `--snapshot-update` without approval flag
+   - Requires full analysis before approval
+   - Clears approval flag after use
+
+**Exit codes:**
+- `0`: Command allowed (may include warnings)
+- `1`: Command blocked (e.g., snapshot update without approval)
+
+---
+
+### user-prompt-submit.sh
+**Triggers:** After user submits a prompt
+
+**Detects:**
+- Snapshot file changes (`.ambr` files)
+- Recent snapshot test runs
+
+**Actions:**
+- Reports modified snapshot files
+- Reminds Claude to provide full analysis
+- Lists requirements for snapshot update approval
+
+**Exit codes:**
+- Always `0` (informational only, never blocks)
+
+---
+
+## Utility Libraries
+
+### lib/env_check.sh
+**Functions:**
+- `check_conda_env()`: Verify conda environment active
+- `get_activation_cmd()`: Return activation command string
+- `prepend_activation()`: Auto-prepend activation to command
+- `needs_conda()`: Check if command requires conda environment
+
+### lib/numerical_validation.sh
+**Functions:**
+- `check_invariants()`: Scan test output for NaN/Inf
+- `has_snapshot_changes()`: Detect modified snapshot files
+- `has_snapshot_approval()`: Check if approval flag set
+- `set_snapshot_approval()`: Create approval flag file
+- `clear_snapshot_approval()`: Remove approval flag file
+
+---
+
+## Hook Environment Variables
+
+Hooks receive these environment variables from Claude Code:
+
+- `CLAUDE_TOOL_NAME`: Name of tool being invoked (e.g., "Bash")
+- `CLAUDE_TOOL_COMMAND`: Full command string being executed
+- `CONDA_DEFAULT_ENV`: Current conda environment name
+
+---
+
+## Testing Hooks
+
+### Manual testing
+
+```bash
+# Test environment check
+export CLAUDE_TOOL_NAME="Bash"
+export CLAUDE_TOOL_COMMAND="pytest --version"
+.claude/hooks/pre-tool-use.sh
+echo "Exit code: $?"
+
+# Test snapshot protection (should block)
+export CLAUDE_TOOL_COMMAND="pytest --snapshot-update"
+.claude/hooks/pre-tool-use.sh
+echo "Exit code: $?"  # Should be 1
+
+# Test with approval
+source .claude/hooks/lib/numerical_validation.sh
+set_snapshot_approval
+.claude/hooks/pre-tool-use.sh
+echo "Exit code: $?"  # Should be 0
+```
+
+### Expected behavior
+
+| Scenario | Hook | Expected Result |
+|----------|------|-----------------|
+| Python command, wrong env | pre-tool-use | Warning (exit 0) |
+| Commit without recent tests | pre-tool-use | Warning (exit 0) |
+| Snapshot update, no approval | pre-tool-use | Blocked (exit 1) |
+| Snapshot update, with approval | pre-tool-use | Allowed, flag cleared (exit 0) |
+| Snapshot files modified | user-prompt-submit | Info message (exit 0) |
+
+---
+
+## Integration with Skills
+
+Hooks work together with skills:
+
+1. **Skills** (layer 2) guide Claude through workflows
+2. **Hooks** (layer 1) enforce critical requirements
+3. **Documentation** (layer 3) explains the "why"
+
+Example flow:
+```
+Claude uses scientific-tdd skill
+  ↓
+Skill says: "Run tests"
+  ↓
+Claude executes: pytest command
+  ↓
+pre-tool-use hook checks conda env
+  ↓
+Hook passes or warns
+  ↓
+Command executes
+```
+
+---
+
+## Debugging Hooks
+
+If hooks misbehave:
+
+1. **Check hook permissions:**
+   ```bash
+   ls -l .claude/hooks/*.sh
+   # Should show -rwxr-xr-x
+   ```
+
+2. **Test utilities directly:**
+   ```bash
+   source .claude/hooks/lib/env_check.sh
+   check_conda_env && echo "OK" || echo "FAIL"
+   ```
+
+3. **Run hook with debug output:**
+   ```bash
+   bash -x .claude/hooks/pre-tool-use.sh
+   ```
+
+4. **Check environment variables:**
+   ```bash
+   echo "Tool: $CLAUDE_TOOL_NAME"
+   echo "Command: $CLAUDE_TOOL_COMMAND"
+   echo "Conda: $CONDA_DEFAULT_ENV"
+   ```
+
+---
+
+## Maintenance
+
+### When to update hooks:
+
+- Conda environment name changes
+- New tools need environment checking
+- Validation requirements change
+- New safety checks needed
+
+### Best practices:
+
+- Keep hooks fast (< 100ms)
+- Always exit with appropriate code (0 or 1)
+- Provide helpful error messages
+- Source utilities from `lib/` directory
+- Test thoroughly before deployment
+
+---
+
+## Related Documentation
+
+- **CLAUDE.md**: Project operational rules
+- **Skills**: Workflow enforcement
+- **Testing Plan**: Coverage improvement strategy
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+#!/bin/bash
+# Environment validation utilities for non_local_detector project
+
+# Check if conda environment is activated
+check_conda_env() {
+    local required_env="non_local_detector"
+
+    # Check CONDA_DEFAULT_ENV
+    if [ "$CONDA_DEFAULT_ENV" = "$required_env" ]; then
+        return 0
+    fi
+
+    # Check python path
+    local python_path=$(which python 2>/dev/null)
+    if [[ "$python_path" == *"/envs/$required_env/"* ]]; then
+        return 0
+    fi
+
+    return 1
+}
+
+# Get activation command
+get_activation_cmd() {
+    echo "conda activate non_local_detector"
+}
+
+# Auto-prepend conda activation to command
+prepend_activation() {
+    local cmd="$1"
+    echo "conda activate non_local_detector && $cmd"
+}
+
+# Check if command needs conda environment
+needs_conda() {
+    local cmd="$1"
+
+    # Check for Python-related commands
+    if [[ "$cmd" =~ ^(python|pytest|pip|black|ruff|mypy) ]]; then
+        return 0
+    fi
+
+    # Check for full paths to conda binaries
+    if [[ "$cmd" =~ /envs/[^/]+/bin/ ]]; then
+        return 0
+    fi
+
+    return 1
+}
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+#!/bin/bash
+# Numerical validation utilities for scientific code
+
+# Check if mathematical invariants hold
+check_invariants() {
+    local test_output="$1"
+
+    # Look for common numerical issues in test output
+    if echo "$test_output" | grep -q "NaN\|Inf\|-Inf"; then
+        echo "❌ Numerical issue detected: NaN or Inf in outputs"
+        return 1
+    fi
+
+    return 0
+}
+
+# Detect snapshot changes
+has_snapshot_changes() {
+    # Check if any snapshot files have been modified
+    if git status --porcelain | grep -q "\.ambr$"; then
+        return 0
+    fi
+
+    # Check syrupy snapshot directory
+    if [ -d ".pytest_cache/v/cache/snapshot" ]; then
+        if [ -n "$(find .pytest_cache/v/cache/snapshot -mmin -5 2>/dev/null)" ]; then
+            return 0
+        fi
+    fi
+
+    return 1
+}
+
+# Check if approval flag is set
+has_snapshot_approval() {
+    [ -f ".claude/snapshot_update_approved" ]
+}
+
+# Set approval flag
+set_snapshot_approval() {
+    mkdir -p .claude
+    touch .claude/snapshot_update_approved
+    echo "Snapshot update approved at $(date)" > .claude/snapshot_update_approved
+}
+
+# Clear approval flag
+clear_snapshot_approval() {
+    rm -f .claude/snapshot_update_approved
+}
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+#!/bin/bash
+# Pre-tool-use hook for Claude Code
+# Enforces conda environment and test-before-commit requirements
+
+# Source utilities
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/lib/env_check.sh"
+source "$SCRIPT_DIR/lib/numerical_validation.sh"
+
+# Get the tool name and command from arguments
+TOOL_NAME="${CLAUDE_TOOL_NAME:-unknown}"
+TOOL_COMMAND="${CLAUDE_TOOL_COMMAND:-}"
+
+# Only process Bash tool invocations
+if [ "$TOOL_NAME" != "Bash" ]; then
+    exit 0
+fi
+
+# Extract base command (first word)
+BASE_CMD=$(echo "$TOOL_COMMAND" | awk '{print $1}')
+
+# Check 1: Environment enforcement for Python commands
+if needs_conda "$BASE_CMD"; then
+    if ! check_conda_env; then
+        echo "❌ Wrong conda environment detected!"
+        echo "Required: non_local_detector"
+        echo "Current: ${CONDA_DEFAULT_ENV:-none}"
+        echo ""
+        echo "Run: $(get_activation_cmd)"
+        echo ""
+        echo "Or commands will be auto-prepended with activation."
+
+        # Don't block - just warn (auto-prepend will handle it)
+        exit 0
+    fi
+fi
+
+# Check 2: Test-before-commit enforcement
+if [[ "$TOOL_COMMAND" =~ ^git[[:space:]]+commit ]]; then
+    # Check if tests have run recently (within last 5 minutes)
+    if [ -d ".pytest_cache" ]; then
+        CACHE_AGE=$(find .pytest_cache -type f -mmin -5 2>/dev/null | wc -l)
+        if [ "$CACHE_AGE" -eq 0 ]; then
+            echo "⚠️  No recent test runs detected"
+            echo "Recommendation: Run tests before committing"
+            echo ""
+            echo "Run: /Users/edeno/miniconda3/envs/non_local_detector/bin/pytest -v"
+            echo ""
+            echo "Proceeding with commit anyway (warning only)..."
+        fi
+    fi
+fi
+
+# Check 3: Snapshot update protection
+if [[ "$TOOL_COMMAND" =~ --snapshot-update ]]; then
+    if ! has_snapshot_approval; then
+        echo "❌ Snapshot update attempted without approval!"
+        echo ""
+        echo "Snapshot updates require explicit approval."
+        echo "Claude must provide full analysis first:"
+        echo "  1. Diff: What changed in snapshots"
+        echo "  2. Explanation: Why the change occurred"
+        echo "  3. Validation: Mathematical properties still hold"
+        echo "  4. Test case: Demonstrate correctness"
+        echo ""
+        echo "After approval, user must set approval flag."
+
+        # Block this command
+        exit 1
+    fi
+
+    # Clear approval flag after use
+    clear_snapshot_approval
+fi
+
+# All checks passed
+exit 0