diff --git a/bin/disinto b/bin/disinto
index f9bfe04..5f57927 100755
--- a/bin/disinto
+++ b/bin/disinto
@@ -783,9 +783,29 @@ _disinto_init_nomad() {
     fi
 
     if [ -n "$with_services" ]; then
+      # Vault seed plan (S2.6, #928): one line per service whose
+      # tools/vault-seed-<svc>.sh ships. Services without a seeder are
+      # silently skipped — the real-run loop below mirrors this,
+      # making `--with woodpecker` in Step 3 auto-invoke
+      # tools/vault-seed-woodpecker.sh once that file lands without
+      # any further change to bin/disinto.
+      local seed_hdr_printed=false
+      local IFS=','
+      for svc in $with_services; do
+        svc=$(echo "$svc" | xargs)  # trim whitespace
+        local seed_script="${FACTORY_ROOT}/tools/vault-seed-${svc}.sh"
+        if [ -x "$seed_script" ]; then
+          if [ "$seed_hdr_printed" = false ]; then
+            echo "── Vault seed dry-run ─────────────────────────────────"
+            seed_hdr_printed=true
+          fi
+          echo "[seed] [dry-run] ${seed_script} --dry-run"
+        fi
+      done
+      [ "$seed_hdr_printed" = true ] && echo ""
+
       echo "── Deploy services dry-run ────────────────────────────"
       echo "[deploy] services to deploy: ${with_services}"
-      local IFS=','
       for svc in $with_services; do
         svc=$(echo "$svc" | xargs)  # trim whitespace
         # Validate known services first
@@ -893,6 +913,50 @@ _disinto_init_nomad() {
     echo "[import] no --import-env/--import-sops — skipping; set them or seed kv/disinto/* manually before deploying secret-dependent services"
   fi
 
+  # Seed Vault for services that ship their own seeder (S2.6, #928).
+  # Convention: tools/vault-seed-<svc>.sh — auto-invoked when --with <svc>
+  # is requested. Runs AFTER vault-import so that real imported values
+  # win over generated seeds when both are present; each seeder is
+  # idempotent on a per-key basis (see vault-seed-forgejo.sh's
+  # "missing → generate, present → unchanged" contract), so re-running
+  # init does not rotate existing keys. Services without a seeder are
+  # silently skipped — keeps this loop forward-compatible with Step 3+
+  # services that may ship their own seeder without touching bin/disinto.
+  #
+  # VAULT_ADDR is passed explicitly because cluster-up.sh writes the
+  # profile.d export *during* this same init run, so the current shell
+  # hasn't sourced it yet; sibling vault-* scripts (engines/policies/
+  # auth/import) default VAULT_ADDR internally via _hvault_default_env,
+  # but vault-seed-forgejo.sh requires the caller to set it.
+  #
+  # The non-root branch invokes the seeder as `sudo -n -- env VAR=val
+  # script` rather than `sudo -n VAR=val -- script`: sudo treats bare
+  # `VAR=val` args as sudoers env-assignments, which the default
+  # `env_reset=on` policy silently discards unless the variable is in
+  # `env_keep` (VAULT_ADDR is not). Using `env` as the actual command
+  # sets VAULT_ADDR in the child process regardless of sudoers policy.
+  if [ -n "$with_services" ]; then
+    local vault_addr="${VAULT_ADDR:-http://127.0.0.1:8200}"
+    local IFS=','
+    for svc in $with_services; do
+      svc=$(echo "$svc" | xargs)  # trim whitespace
+      local seed_script="${FACTORY_ROOT}/tools/vault-seed-${svc}.sh"
+      if [ -x "$seed_script" ]; then
+        echo ""
+        echo "── Seeding Vault for ${svc} ───────────────────────────"
+        if [ "$(id -u)" -eq 0 ]; then
+          VAULT_ADDR="$vault_addr" "$seed_script" || exit $?
+        else
+          if ! command -v sudo >/dev/null 2>&1; then
+            echo "Error: vault-seed-${svc}.sh must run as root and sudo is not installed" >&2
+            exit 1
+          fi
+          sudo -n -- env "VAULT_ADDR=$vault_addr" "$seed_script" || exit $?
+        fi
+      fi
+    done
+  fi
+
   # Deploy services if requested
   if [ -n "$with_services" ]; then
     echo ""
diff --git a/tests/disinto-init-nomad.bats b/tests/disinto-init-nomad.bats
index f38805e..21f4303 100644
--- a/tests/disinto-init-nomad.bats
+++ b/tests/disinto-init-nomad.bats
@@ -155,6 +155,44 @@ setup_file() {
   [[ "$output" == *"[deploy] dry-run complete"* ]]
 }
 
+# S2.6 / #928 — every --with <svc> that ships tools/vault-seed-<svc>.sh
+# must auto-invoke the seeder before deploy.sh runs. forgejo is the
+# only service with a seeder today, so the dry-run plan must include
+# its seed line when --with forgejo is set. The seed block must also
+# appear BEFORE the deploy block (seeded secrets must exist before
+# nomad reads the template stanza) — pinned here by scanning output
+# order. Services without a seeder (e.g. unknown hypothetical future
+# ones) are silently skipped by the loop convention.
+@test "disinto init --backend=nomad --with forgejo --dry-run prints seed plan before deploy plan" {
+  run "$DISINTO_BIN" init placeholder/repo --backend=nomad --with forgejo --dry-run
+  [ "$status" -eq 0 ]
+  [[ "$output" == *"Vault seed dry-run"* ]]
+  [[ "$output" == *"tools/vault-seed-forgejo.sh --dry-run"* ]]
+  # Order: seed header must appear before deploy header.
+  local seed_line deploy_line
+  seed_line=$(echo "$output" | grep -n "Vault seed dry-run" | head -1 | cut -d: -f1)
+  deploy_line=$(echo "$output" | grep -n "Deploy services dry-run" | head -1 | cut -d: -f1)
+  [ -n "$seed_line" ]
+  [ -n "$deploy_line" ]
+  [ "$seed_line" -lt "$deploy_line" ]
+}
+
+# Regression guard (PR #929 review): `sudo -n VAR=val -- cmd` is subject
+# to sudoers env_reset policy and silently drops VAULT_ADDR unless it's
+# in env_keep (it isn't in default configs). vault-seed-forgejo.sh
+# requires VAULT_ADDR and dies at its own precondition check if unset,
+# so the non-root branch MUST invoke `sudo -n -- env VAR=val cmd` so
+# that `env` sets the variable in the child process regardless of
+# sudoers policy. This grep-level guard catches a revert to the unsafe
+# form that silently broke non-root seed runs on a fresh LXC.
+@test "seed loop invokes sudo via 'env VAR=val' (bypasses sudoers env_reset)" {
+  run grep -F 'sudo -n -- env "VAULT_ADDR=' "$DISINTO_BIN"
+  [ "$status" -eq 0 ]
+  # Negative: no bare `sudo -n "VAR=val" --` form anywhere in the file.
+  run grep -F 'sudo -n "VAULT_ADDR=' "$DISINTO_BIN"
+  [ "$status" -ne 0 ]
+}
+
 @test "disinto init --backend=nomad --with forgejo,forgejo --dry-run handles comma-separated services" {
   run "$DISINTO_BIN" init placeholder/repo --backend=nomad --with forgejo,forgejo --dry-run
   [ "$status" -eq 0 ]