diff --git a/agent-swarm/README.ru.md b/agent-swarm/README.ru.md
index 5f48615..954f635 100644
--- a/agent-swarm/README.ru.md
+++ b/agent-swarm/README.ru.md
@@ -34,8 +34,11 @@ implementer + один critic обычно дают более цельный UI
    baseline и явный вердикт пользователя.
 7. Если лагает или выглядит хуже baseline — чинить, а не добавлять фичи.
 8. Для product — один milestone за раз; следующий не начинать без приёмки.
-9. Проверять prerequisites; глобальные установки/деструктив — только с разрешения.
-10. Инструкции пользователя важнее скилла: попросил быстро/прототип — убрать церемонии, оставить
+9. Проверять prerequisites; ставить только проверенные pinned-инструменты из официальных
+   источников; глобальные установки/деструктив — только с разрешения.
+10. Строить переиспользуемые «руки»: harness, скрипты, фикстуры, screenshot/CLI-утилиты. Тестировать
+    их, документировать и держать в репозитории; неиспользуемые — удалять.
+11. Инструкции пользователя важнее скилла: попросил быстро/прототип — убрать церемонии, оставить
     safety и evidence.
 
 ## Что происходит
diff --git a/agent-swarm/SKILL.md b/agent-swarm/SKILL.md
index 8e66c2b..90bcefb 100644
--- a/agent-swarm/SKILL.md
+++ b/agent-swarm/SKILL.md
@@ -40,9 +40,17 @@ implementer and one critic; parallel panel writers produce incoherent UI.
    the baseline, fix the slice before expanding scope.
 8. **One milestone at a time.** For product work, do not start M1/M2 while M0 is still rough or
    explicitly “not usable”.
-9. **Safety.** Check prerequisites before work; ask before global installs, destructive actions,
-   deployments or irreversible changes. Workers never install or touch live systems.
-10. **User overrides.** Direct user instructions beat this skill. If the user asks for speed, a
+9. **Safety and trusted tools.** Check prerequisites before work. Prefer existing, project-local,
+   pinned tools; use official package managers/registries and lockfiles. Verify the source, license,
+   release and checksum/signature when possible. No `curl | sh`, random binaries, unpinned “latest”
+   or unvetted AI-suggested packages. Ask before `sudo`, global/system installs, destructive actions,
+   deployments or irreversible changes. Workers never install or touch live systems; they return
+   `blocked` with the exact missing item.
+10. **Build leverage.** If a harness, script, fixture, screenshot tool or dev utility will be reused,
+    build it, test it, document it and keep it in the repo. Prefer one small reliable tool over a
+    pile of one-off commands. A broken or untrusted tool is worse than no tool; delete tools nobody
+    uses.
+11. **User overrides.** Direct user instructions beat this skill. If the user asks for speed, a
     prototype or “just do it”, drop the ceremony — keep only the safety and evidence that still
     matter.
 
@@ -51,7 +59,8 @@ implementer and one critic; parallel panel writers produce incoherent UI.
 1. **Understand** the outcome, audience, quality bar and constraints. Ask only when the answer
    changes the result.
 2. **Check** the environment: toolchain, commands, services, display, credentials. If a required
-   item is missing and cannot be resolved safely, ask before starting.
+   item is missing, check whether a small project-local harness/tool can remove the blocker; install
+   only trusted, pinned tools. If it cannot be resolved safely, ask before starting.
 3. **Plan only as much as the risk requires.** For a swarm, write a one-page brief, disjoint scopes,
    frozen contracts and acceptance checks. For direct/paired work, skip the ceremony.
 4. **Work.** Direct, paired or batched workers. Keep files small enough that each worker reads only
diff --git a/agent-swarm/references/prerequisites.md b/agent-swarm/references/prerequisites.md
index 69894a3..7de767f 100644
--- a/agent-swarm/references/prerequisites.md
+++ b/agent-swarm/references/prerequisites.md
@@ -62,6 +62,26 @@ Do not ask "can I install dependencies?" without the exact package, scope and re
 workers while the answer is pending. If the user declines, record the reduced scope and the checks
 that will be `not_run`.
 
+## Tool acquisition and trust
+
+Build tools when they remove repeated work: a test runner, fixture generator, screenshot harness,
+log parser or profiler wrapper. Keep them small, project-local, documented and tested; a tool that
+nobody uses is just another dependency.
+
+When installing something:
+
+- prefer the existing toolchain, project-local installs and lockfiles;
+- use official package managers/registries and pinned versions/commits;
+- check the publisher, repository, license, release notes and checksum/signature where available;
+- inspect install scripts before running them; never `curl | sh`;
+- no unpinned “latest”, random binaries from chat/SEO pages, or packages whose source you cannot see;
+- run untrusted tools in a disposable container/VM, without secrets or network if possible;
+- global/system installs (`sudo`, `apt`, `dnf`, `brew`, global npm/pip) need explicit user approval;
+- record the exact version/commit and install command in the brief or lockfile.
+
+Workers do not install. If a worker needs a tool, it returns `blocked` with the exact command and
+source; the lead verifies and installs it once.
+
 ## Record the result
 
 Write `.swarm/prerequisites.md` and set `state.json.prerequisites` to `passed`, `needs_user`, or