fix(convert): refuse duplicate agent slugs before writing

.github/workflows/check-tools.yml

@@ -25,6 +25,9 @@ jobs:
       - name: Validate converted YAML frontmatter
         run: bash scripts/test-convert-frontmatter.sh
 
+      - name: Reject colliding agent slugs before conversion
+        run: bash scripts/test-convert-slug-collisions.sh
+
       - name: Validate converted outputs (round-trip, strict parse, counts, drift)
         # Drift is advisory on pull requests (agent PRs always move their own manifest line;
         # maintainers regenerate at landing) and enforced on pushes to main.

scripts/convert.sh

@@ -695,6 +695,35 @@ clean_tool_output() {
   find "$dir" -mindepth 1 -maxdepth 1 ! -name 'README.md' -exec rm -rf {} +
 }
 
+# Every per-agent integration writes to a path derived from the normalized
+# name. Refuse collisions before cleaning any existing output: otherwise the
+# later source file silently replaces the earlier agent in the generated tree.
+check_agent_slug_collisions() {
+  local dir dirpath file slug relative i
+  local seen_slugs=() seen_files=()
+  local collisions=0
+  for dir in "${AGENT_DIRS[@]}"; do
+    dirpath="$REPO_ROOT/$dir"
+    [[ -d "$dirpath" ]] || continue
+    while IFS= read -r -d '' file; do
+      is_agent_file "$file" || continue
+      slug="$(agent_slug "$file")"
+      [[ -n "$slug" ]] || continue
+      relative="${file#"$REPO_ROOT"/}"
+      for i in "${!seen_slugs[@]}"; do
+        if [[ "${seen_slugs[i]}" == "$slug" ]]; then
+          error "duplicate agent slug '$slug': ${seen_files[i]} and $relative"
+          collisions=$((collisions + 1))
+          break
+        fi
+      done
+      seen_slugs+=("$slug")
+      seen_files+=("$relative")
+    done < <(find "$dirpath" -name "*.md" -type f -print0)
+  done
+  (( collisions == 0 ))
+}
+
 run_conversions() {
   local tool="$1"
   local count=0
@@ -772,6 +801,8 @@ main() {
     exit 1
   fi
 
+  check_agent_slug_collisions || exit 1
+
   header "The Agency -- Converting agents to tool-specific formats"
   echo "  Repo:   $REPO_ROOT"
   echo "  Output: $OUT_DIR"

scripts/test-convert-slug-collisions.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+# Duplicate normalized names must not silently overwrite one agent's output.
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+scratch="$(mktemp -d)"
+trap 'rm -rf "$scratch"' EXIT
+
+mkdir -p "$scratch/repo/scripts" "$scratch/repo/engineering" "$scratch/output/gemini-cli"
+cp "$SCRIPT_DIR/convert.sh" "$SCRIPT_DIR/lib.sh" "$scratch/repo/scripts/"
+
+cat > "$scratch/repo/engineering/first.md" <<'EOF'
+---
+name: Dev Ops
+description: First agent
+color: blue
+---
+# First agent
+EOF
+cat > "$scratch/repo/engineering/second.md" <<'EOF'
+---
+name: Dev/Ops
+description: Second agent
+color: red
+---
+# Second agent
+EOF
+
+printf 'keep existing output\n' > "$scratch/output/gemini-cli/sentinel"
+if bash "$scratch/repo/scripts/convert.sh" --tool gemini-cli --out "$scratch/output" > "$scratch/log" 2>&1; then
+  echo "FAIL: converter accepted two agents with the same output slug"
+  exit 1
+fi
+grep -q "duplicate agent slug 'dev-ops'" "$scratch/log"
+grep -q 'engineering/first.md' "$scratch/log"
+grep -q 'engineering/second.md' "$scratch/log"
+[[ "$(cat "$scratch/output/gemini-cli/sentinel")" == 'keep existing output' ]]
+echo "PASS: duplicate slug refused before existing output changed"