diff --git a/.claude/skills/atlas/SKILL.md b/.claude/skills/atlas/SKILL.md
index 218516228..8a68ae21c 100644
--- a/.claude/skills/atlas/SKILL.md
+++ b/.claude/skills/atlas/SKILL.md
@@ -99,6 +99,28 @@ Reads `habitable_planet_count`, `inhabited_planet_count`, `gas_giant`,
 Creates: planets (inhabited first), gas giants, asteroid belts, oort cloud per
 system, horizon station per oort cloud. Skips systems that already have bodies.
 
+### Update a system-level field
+```bash
+tooling/atlas-update-field "GJ 687" settlement_wave wave_3
+tooling/atlas-update-field "GJ 53A" star_type G
+```
+Updates a whitelisted field in systems.db. Auto-detects the correct table
+(`star_systems`, `system_gates`, or `system_history`). Inserts a row in
+child tables if one doesn't exist yet.
+
+Whitelisted fields: `star_type`, `spectral_class`, `proper_name`,
+`geographic_sector`, `habitable_planet_count`, `inhabited_planet_count`,
+`gate_topology`, `aperture_count`, `hop_distance_from_gateway`,
+`settlement_wave`, `founding_culture_primary`, `founding_culture_secondary`.
+
+### Commit and sync a single system
+```bash
+tooling/atlas-commit-and-sync "GJ 105A" east_reach
+```
+Full pipeline: verify proposal → wipe existing data (if any) → commit to DB
+→ sync wiki → git add + git commit. Second argument is the corridor tag for
+the commit message (defaults to `east_reach`).
+
 ## Body ID Naming Convention
 
 ```
diff --git a/tooling/atlas-commit-and-sync b/tooling/atlas-commit-and-sync
new file mode 100755
index 000000000..fff2d1c77
--- /dev/null
+++ b/tooling/atlas-commit-and-sync
@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+# Commit a single system proposal to DB, sync wiki, and create a git commit.
+# Handles wipe-if-exists automatically.
+#
+# Usage: atlas-commit-and-sync "GJ 105A" [corridor_tag]
+#   corridor_tag defaults to "east_reach"
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+ATLAS="$SCRIPT_DIR/atlas"
+
+if [[ $# -lt 1 ]]; then
+  echo "Usage: atlas-commit-and-sync SYSTEM_ID [corridor_tag]" >&2
+  exit 1
+fi
+
+SYS_ID="$1"
+CORRIDOR="${2:-east_reach}"
+SLUG="${SYS_ID// /}"
+FILE="docs/atlas/proposals/${SLUG}.json"
+WIKI_SLUG="${SYS_ID// /-}"
+WIKI="wiki/star-systems/${WIKI_SLUG}/index.md"
+
+if [[ ! -f "$FILE" ]]; then
+  echo "ERROR: proposal not found: $FILE" >&2
+  exit 1
+fi
+
+# 1. Verify
+echo "--- Verifying $FILE"
+"$SCRIPT_DIR/atlas-verify" "$FILE"
+
+# 2. Get system info for commit message
+PROPER=$(python3 -c "import json; d=json.load(open('$FILE')); print(d.get('proper_name') or d['system_id'])")
+
+# 3. Wipe existing data if present
+BODY_COUNT=$("$ATLAS" show-system "$SYS_ID" 2>/dev/null \
+  | python3 -c "import json,sys; d=json.load(sys.stdin); print(len(d.get('bodies',[])))" 2>/dev/null \
+  || echo "0")
+if [[ "$BODY_COUNT" -gt 0 ]]; then
+  echo "--- Wiping existing data for $SYS_ID"
+  "$ATLAS" wipe-system "$SYS_ID"
+fi
+
+# 4. Commit to DB
+echo "--- Committing $SYS_ID to systems.db"
+"$ATLAS" commit-system "$FILE"
+
+# 5. Sync wiki
+echo "--- Syncing wiki"
+"$ATLAS" sync-wiki "$SYS_ID"
+
+# 6. Git add + commit
+echo "--- Git commit"
+git add "$FILE"
+[[ -f "$WIKI" ]] && git add "$WIKI"
+git commit -m "data(atlas): author ${SYS_ID} (${PROPER}) — ${CORRIDOR}
+
+Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>"
+
+echo "--- Done: $SYS_ID ($PROPER)"
diff --git a/tooling/atlas-update-field b/tooling/atlas-update-field
new file mode 100755
index 000000000..1aeca5c80
--- /dev/null
+++ b/tooling/atlas-update-field
@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+# Update a field on a star system record in systems.db.
+# Automatically detects which table the field belongs to.
+#
+# Usage: atlas-update-field "GJ 687" settlement_wave wave_3
+#        atlas-update-field "GJ 53A" star_type G
+set -euo pipefail
+DB="$(cd "$(dirname "$0")/../server/data" && pwd)/systems.db"
+
+if [[ $# -ne 3 ]]; then
+  echo "Usage: atlas-update-field SYSTEM_ID FIELD VALUE" >&2
+  exit 1
+fi
+
+SYS="$1" FIELD="$2" VALUE="$3"
+
+python3 -c "
+import sqlite3, sys
+
+FIELD_TABLE = {
+    # star_systems
+    'star_type': 'star_systems',
+    'spectral_class': 'star_systems',
+    'proper_name': 'star_systems',
+    'geographic_sector': 'star_systems',
+    'habitable_planet_count': 'star_systems',
+    'inhabited_planet_count': 'star_systems',
+    # system_gates
+    'gate_topology': 'system_gates',
+    'aperture_count': 'system_gates',
+    'hop_distance_from_gateway': 'system_gates',
+    # system_history
+    'settlement_wave': 'system_history',
+    'founding_culture_primary': 'system_history',
+    'founding_culture_secondary': 'system_history',
+}
+
+field = sys.argv[1]
+value = sys.argv[2]
+system_id = sys.argv[3]
+
+if field not in FIELD_TABLE:
+    print(f'ERROR: field \"{field}\" not in whitelist', file=sys.stderr)
+    print(f'Allowed: {sorted(FIELD_TABLE.keys())}', file=sys.stderr)
+    sys.exit(1)
+
+table = FIELD_TABLE[field]
+conn = sqlite3.connect(sys.argv[4])
+cur = conn.cursor()
+
+# Ensure row exists in target table (history/gates may not have a row yet)
+if table != 'star_systems':
+    cur.execute(f'INSERT OR IGNORE INTO {table} (system_id) VALUES (?)', (system_id,))
+
+cur.execute(f'UPDATE {table} SET {field} = ? WHERE system_id = ?', (value, system_id))
+print(f'updated {cur.rowcount} row(s): {system_id}.{field} = {value} ({table})')
+conn.commit()
+conn.close()
+" "$FIELD" "$VALUE" "$SYS" "$DB"