diff --git a/.github/workflows/lint-agents.yml b/.github/workflows/lint-agents.yml
new file mode 100644
index 0000000..8baa37f
--- /dev/null
+++ b/.github/workflows/lint-agents.yml
@@ -0,0 +1,44 @@
+name: Lint Agent Files
+
+on:
+  pull_request:
+    paths:
+      - 'design/**'
+      - 'engineering/**'
+      - 'marketing/**'
+      - 'product/**'
+      - 'project-management/**'
+      - 'testing/**'
+      - 'support/**'
+      - 'spatial-computing/**'
+      - 'specialized/**'
+
+jobs:
+  lint:
+    name: Validate agent frontmatter and structure
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Get changed agent files
+        id: changed
+        run: |
+          FILES=$(git diff --name-only --diff-filter=ACMR origin/${{ github.base_ref }}...HEAD -- \
+            'design/*.md' 'engineering/*.md' 'marketing/*.md' 'product/*.md' \
+            'project-management/*.md' 'testing/*.md' 'support/*.md' \
+            'spatial-computing/*.md' 'specialized/*.md')
+          echo "files=$FILES" >> "$GITHUB_OUTPUT"
+          if [ -z "$FILES" ]; then
+            echo "No agent files changed."
+          else
+            echo "Changed files:"
+            echo "$FILES"
+          fi
+
+      - name: Run agent linter
+        if: steps.changed.outputs.files != ''
+        run: |
+          chmod +x scripts/lint-agents.sh
+          ./scripts/lint-agents.sh ${{ steps.changed.outputs.files }}
diff --git a/scripts/lint-agents.sh b/scripts/lint-agents.sh
new file mode 100755
index 0000000..3ba121c
--- /dev/null
+++ b/scripts/lint-agents.sh
@@ -0,0 +1,114 @@
+#!/usr/bin/env bash
+#
+# Validates agent markdown files:
+#   1. YAML frontmatter must exist with name, description, color (ERROR)
+#   2. Recommended sections checked but only warned (WARN)
+#   3. File must have meaningful content
+#
+# Usage: ./scripts/lint-agents.sh [file ...]
+#   If no files given, scans all agent directories.
+
+set -euo pipefail
+
+AGENT_DIRS=(
+  design
+  engineering
+  marketing
+  product
+  project-management
+  testing
+  support
+  spatial-computing
+  specialized
+)
+
+REQUIRED_FRONTMATTER=("name" "description" "color")
+RECOMMENDED_SECTIONS=("Identity" "Core Mission" "Critical Rules")
+
+errors=0
+warnings=0
+
+lint_file() {
+  local file="$1"
+
+  # 1. Check frontmatter delimiters
+  local first_line
+  first_line=$(head -1 "$file")
+  if [[ "$first_line" != "---" ]]; then
+    echo "ERROR $file: missing frontmatter opening ---"
+    ((errors++))
+    return
+  fi
+
+  # Extract frontmatter (between first and second ---)
+  local frontmatter
+  frontmatter=$(awk 'NR==1{next} /^---$/{exit} {print}' "$file")
+
+  if [[ -z "$frontmatter" ]]; then
+    echo "ERROR $file: empty or malformed frontmatter"
+    ((errors++))
+    return
+  fi
+
+  # 2. Check required frontmatter fields
+  for field in "${REQUIRED_FRONTMATTER[@]}"; do
+    if ! echo "$frontmatter" | grep -qE "^${field}:"; then
+      echo "ERROR $file: missing frontmatter field '${field}'"
+      ((errors++))
+    fi
+  done
+
+  # 3. Check recommended sections (warn only)
+  local body
+  body=$(awk 'BEGIN{n=0} /^---$/{n++; next} n>=2{print}' "$file")
+
+  for section in "${RECOMMENDED_SECTIONS[@]}"; do
+    if ! echo "$body" | grep -qi "$section"; then
+      echo "WARN  $file: missing recommended section '${section}'"
+      ((warnings++))
+    fi
+  done
+
+  # 4. Check file has meaningful content
+  if [[ $(echo "$body" | wc -w) -lt 50 ]]; then
+    echo "WARN  $file: body seems very short (< 50 words)"
+    ((warnings++))
+  fi
+}
+
+# Collect files to lint
+files=()
+if [[ $# -gt 0 ]]; then
+  files=("$@")
+else
+  for dir in "${AGENT_DIRS[@]}"; do
+    if [[ -d "$dir" ]]; then
+      while IFS= read -r f; do
+        files+=("$f")
+      done < <(find "$dir" -maxdepth 1 -name "*.md" -type f | sort)
+    fi
+  done
+fi
+
+if [[ ${#files[@]} -eq 0 ]]; then
+  echo "No agent files found."
+  exit 1
+fi
+
+echo "Linting ${#files[@]} agent files..."
+echo ""
+
+for file in "${files[@]}"; do
+  lint_file "$file"
+done
+
+echo ""
+echo "Results: ${errors} error(s), ${warnings} warning(s) in ${#files[@]} files."
+
+if [[ $errors -gt 0 ]]; then
+  echo "FAILED: fix the errors above before merging."
+  exit 1
+else
+  echo "PASSED"
+  exit 0
+fi