diff --git a/backend/alembic/versions/4e679f11da46_插件沙箱执行记录.py b/backend/alembic/versions/4e679f11da46_插件沙箱执行记录.py
new file mode 100644
index 0000000..ac1076a
--- /dev/null
+++ b/backend/alembic/versions/4e679f11da46_插件沙箱执行记录.py
@@ -0,0 +1,47 @@
+"""插件沙箱执行记录
+
+Revision ID: 4e679f11da46
+Revises: 89a4ed9647ee
+Create Date: 2026-09-12 13:33:43.279920
+
+"""
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = '4e679f11da46'
+down_revision: str | Sequence[str] | None = '89a4ed9647ee'
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('plugin_execution',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('installation_id', sa.String(), nullable=False),
+    sa.Column('status', sa.String(), nullable=False),
+    sa.Column('exit_code', sa.Integer(), nullable=True),
+    sa.Column('duration_ms', sa.Integer(), nullable=True),
+    sa.Column('stdout_excerpt', sa.String(), nullable=True),
+    sa.Column('error', sa.String(), nullable=True),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=False),
+    sa.Column('completed_at', sa.DateTime(timezone=True), nullable=True),
+    sa.CheckConstraint("status IN ('running', 'succeeded', 'failed', 'timeout', 'killed')", name=op.f('ck_plugin_execution_status_values')),
+    sa.ForeignKeyConstraint(['installation_id'], ['plugin_installation.id'], name=op.f('fk_plugin_execution_plugin_installation'), ondelete='cascade'),
+    sa.PrimaryKeyConstraint('id', name=op.f('pk_plugin_execution'))
+    )
+    op.create_index(op.f('ix_plugin_execution_installation_id'), 'plugin_execution', ['installation_id'], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_plugin_execution_installation_id'), table_name='plugin_execution')
+    op.drop_table('plugin_execution')
+    # ### end Alembic commands ###
diff --git a/backend/app/core/config.py b/backend/app/core/config.py
index a21977e..3cb4dfa 100644
--- a/backend/app/core/config.py
+++ b/backend/app/core/config.py
@@ -13,6 +13,7 @@ class Settings(BaseSettings):
     api_port: int = 8000
     database_url: str = "postgresql+asyncpg://hunjing:hunjing_dev_password@127.0.0.1:5432/hunjing"
     storage_root: str = "storage"
+    sandbox_enabled: bool = False  # 未启用时隔离插件执行 fail-closed
 
 
 @lru_cache
diff --git a/backend/app/models.py b/backend/app/models.py
index 40d5b0c..1e3de03 100644
--- a/backend/app/models.py
+++ b/backend/app/models.py
@@ -1304,3 +1304,32 @@ class DiagnosticGrant(Base):
     created_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True), nullable=False, server_default=func.now()
     )
+
+
+class PluginExecution(Base):
+    """插件沙箱执行记录（WP-06/07 Sandbox）：结果与资源消耗如实留痕。"""
+
+    __tablename__ = "plugin_execution"
+
+    id: Mapped[str] = mapped_column(
+        String, primary_key=True, default=lambda: new_id("execution_")
+    )
+    installation_id: Mapped[str] = mapped_column(
+        ForeignKey("plugin_installation.id", ondelete="cascade"), nullable=False, index=True
+    )
+    status: Mapped[str] = mapped_column(String, nullable=False, default="running")
+    exit_code: Mapped[int | None] = mapped_column(nullable=True)
+    duration_ms: Mapped[int | None] = mapped_column(nullable=True)
+    stdout_excerpt: Mapped[str | None] = mapped_column(String, nullable=True)
+    error: Mapped[str | None] = mapped_column(String, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, server_default=func.now()
+    )
+    completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+
+    __table_args__ = (
+        CheckConstraint(
+            "status IN ('running', 'succeeded', 'failed', 'timeout', 'killed')",
+            name="status_values",
+        ),
+    )
diff --git a/backend/app/plugins/routes.py b/backend/app/plugins/routes.py
index ac73f1d..f5a4d8c 100644
--- a/backend/app/plugins/routes.py
+++ b/backend/app/plugins/routes.py
@@ -144,3 +144,27 @@ async def invoke(
         db, domain.id, name, body.get("input", {}), body.get("run_id"),
         getattr(request.state, "trace_id", None),
     )
+
+
+@inst_router.post("/{installation_id}/executions", status_code=201)
+async def execute_plugin(
+    installation_id: str,
+    db: DbSession,
+    user: Annotated[User, Depends(require_state_change)],
+    request: Request,
+    body: dict[str, Any],
+) -> dict[str, Any]:
+    """沙箱执行 isolated 插件：未启用沙箱一律 503（fail-closed）。"""
+    domain = await _domain_of(db, user)
+    from app.core.config import get_settings
+
+    execution, result = await service.execute_isolated(
+        db, domain.id, installation_id, body.get("input", {}),
+        sandbox_enabled=get_settings().sandbox_enabled,
+        trace_id=getattr(request.state, "trace_id", None),
+    )
+    return {
+        "execution_id": execution.id, "status": result["status"],
+        "duration_ms": result.get("duration_ms"),
+        "output": result.get("output"), "error": result.get("error"),
+    }
diff --git a/backend/app/plugins/service.py b/backend/app/plugins/service.py
index 1ed3495..4d1c4f8 100644
--- a/backend/app/plugins/service.py
+++ b/backend/app/plugins/service.py
@@ -297,3 +297,70 @@ async def invoke(
     )
     await db.flush()
     return output
+
+
+async def execute_isolated(
+    db: AsyncSession,
+    domain_id: str,
+    installation_id: str,
+    input_: dict[str, Any],
+    sandbox_enabled: bool,
+    trace_id: str | None,
+) -> tuple[Any, dict[str, Any]]:
+    """隔离执行：isolated 形态插件经沙箱子进程运行；未启用沙箱一律拒绝。
+
+    返回（执行记录, 结果）。代码体取自 Manifest 的 code 字段
+    （部署者明确信任的本地代码插件，仍受资源限制约束）。
+    """
+    from app.models import PluginExecution
+    from app.sandbox.executor import run_sandboxed
+
+    installation = await require_installation(db, domain_id, installation_id)
+    plugin = await db.get(Plugin, installation.plugin_name)
+    assert plugin is not None
+    if plugin.kind != "isolated_process":
+        raise HTTPException(
+            status.HTTP_422_UNPROCESSABLE_ENTITY, "仅 isolated_process 形态走沙箱执行"
+        )
+    if not installation.enabled:
+        raise HTTPException(status.HTTP_403_FORBIDDEN, "插件未启用")
+    if not sandbox_enabled:
+        db.add(
+            AuditEvent(
+                actor_type="user", actor_id=domain_id, action="plugin.execution_denied",
+                aggregate_type="plugin", aggregate_id=plugin.name,
+                payload={"reason": "sandbox_not_enabled"}, trace_id=trace_id,
+            )
+        )
+        await db.flush()
+        raise HTTPException(
+            status.HTTP_503_SERVICE_UNAVAILABLE,
+            "沙箱未启用：拒绝执行（fail-closed），启用请设置 HUNJING_SANDBOX_ENABLED",
+        )
+    pv = await db.get(PluginVersion, installation.version_id)
+    assert pv is not None
+    code = str(pv.manifest.get("code", ""))
+    execution = PluginExecution(installation_id=installation.id, status="running")
+    db.add(execution)
+    await db.flush()
+    result = await run_sandboxed(code, input_)
+    execution.status = result["status"]
+    execution.exit_code = result.get("exit_code")
+    execution.duration_ms = result.get("duration_ms")
+    execution.stdout_excerpt = result.get("stdout_excerpt")
+    execution.error = result.get("error")
+    from datetime import UTC
+    from datetime import datetime as _dt
+
+    execution.completed_at = _dt.now(UTC)
+    db.add(
+        AuditEvent(
+            actor_type="user", actor_id=domain_id, action="plugin.executed",
+            aggregate_type="plugin", aggregate_id=plugin.name,
+            payload={"execution_id": execution.id, "status": execution.status,
+                     "duration_ms": execution.duration_ms},
+            trace_id=trace_id,
+        )
+    )
+    await db.flush()
+    return execution, result
diff --git a/backend/app/sandbox/__init__.py b/backend/app/sandbox/__init__.py
new file mode 100644
index 0000000..0444c1d
--- /dev/null
+++ b/backend/app/sandbox/__init__.py
@@ -0,0 +1 @@
+"""沙箱域：隔离执行器与策略。"""
diff --git a/backend/app/sandbox/executor.py b/backend/app/sandbox/executor.py
new file mode 100644
index 0000000..8218b67
--- /dev/null
+++ b/backend/app/sandbox/executor.py
@@ -0,0 +1,109 @@
+"""沙箱执行器（WP-06/07 Sandbox）：子进程隔离 + 资源限制 + 超时。
+
+隔离边界（按部署档）：
+- 本执行器提供：独立进程、CPU/内存 rlimit、墙钟超时与强杀、输出限额。
+- 进程级隔离不是完整安全边界；网络隔离与文件系统最小化在 Linux 容器档
+  （container 形态）交付。部署者必须显式启用沙箱（HUNJING_SANDBOX_ENABLED），
+  未启用时一律拒绝执行（fail-closed，AGENTS 第 6 节）。
+"""
+
+import asyncio
+import json
+import resource
+import sys
+import time
+from dataclasses import dataclass
+from typing import Any
+
+# 用户代码经 stdin JSON 传输，不进命令行（避免注入命令行参数）
+_RUNNER = r'''
+import json, sys
+def _main():
+    payload = json.loads(sys.stdin.read())
+    scope = {"input": payload.get("input", {})}
+    exec(compile(payload["code"], "<plugin>", "exec"), scope)
+    result = scope.get("output")
+    sys.stdout.write(json.dumps({"output": result}, ensure_ascii=False))
+_main()
+'''
+
+
+@dataclass(frozen=True)
+class SandboxPolicy:
+    max_runtime_ms: int = 5_000
+    max_memory_mb: int = 128
+    max_output_chars: int = 10_000
+
+
+class SandboxUnavailable(Exception):
+    """未启用沙箱：调用方必须显式失败，不得退化为宿主执行。"""
+
+
+def _apply_limits(policy: SandboxPolicy) -> None:  # 在子进程内执行（preexec_fn）
+    # RLIMIT_AS 在部分平台（macOS）不可设：尽力而为，失败不阻断进程隔离
+    cpu_seconds = max(1, policy.max_runtime_ms // 1000 + 1)
+    resource.setrlimit(resource.RLIMIT_CPU, (cpu_seconds, cpu_seconds))
+    if hasattr(resource, "RLIMIT_AS"):
+        as_bytes = policy.max_memory_mb * 1024 * 1024
+        try:
+            resource.setrlimit(resource.RLIMIT_AS, (as_bytes, as_bytes))
+        except (ValueError, OSError):
+            pass
+
+
+async def run_sandboxed(
+    code: str, input_: dict[str, Any], policy: SandboxPolicy | None = None
+) -> dict[str, Any]:
+    """在受限子进程中执行插件代码；返回执行结果（不抛业务异常以外的错误）。"""
+    pol = policy or SandboxPolicy()
+    stdin_payload = json.dumps({"code": code, "input": input_}, ensure_ascii=False)
+    started = time.monotonic()
+    try:
+        proc = await asyncio.create_subprocess_exec(
+            sys.executable, "-c", _RUNNER,
+            stdin=asyncio.subprocess.PIPE,
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE,
+            preexec_fn=lambda: _apply_limits(pol),
+        )
+    except Exception as exc:  # 进程无法启动：如实失败
+        return {
+            "status": "failed", "exit_code": None,
+            "duration_ms": int((time.monotonic() - started) * 1000),
+            "output": None, "error": f"sandbox_spawn_failed: {exc}",
+        }
+    try:
+        stdout, stderr = await asyncio.wait_for(
+            proc.communicate(stdin_payload.encode("utf-8")),
+            timeout=pol.max_runtime_ms / 1000,
+        )
+    except TimeoutError:
+        proc.kill()
+        await proc.wait()
+        return {
+            "status": "timeout", "exit_code": None,
+            "duration_ms": int((time.monotonic() - started) * 1000),
+            "output": None, "error": f"exceeded {pol.max_runtime_ms}ms wall clock",
+        }
+    duration_ms = int((time.monotonic() - started) * 1000)
+    out_text = stdout.decode("utf-8", "replace")[: pol.max_output_chars]
+    err_text = stderr.decode("utf-8", "replace")[: pol.max_output_chars]
+    if proc.returncode == 0:
+        try:
+            parsed = json.loads(out_text)
+        except json.JSONDecodeError:
+            return {
+                "status": "failed", "exit_code": proc.returncode,
+                "duration_ms": duration_ms, "output": None,
+                "error": "plugin output is not JSON",
+            }
+        return {
+            "status": "succeeded", "exit_code": 0,
+            "duration_ms": duration_ms, "output": parsed.get("output"),
+            "stdout_excerpt": out_text, "error": None,
+        }
+    return {
+        "status": "failed", "exit_code": proc.returncode,
+        "duration_ms": duration_ms, "output": None,
+        "stdout_excerpt": out_text, "error": err_text or f"exit {proc.returncode}",
+    }
diff --git a/backend/tests/test_conversations.py b/backend/tests/test_conversations.py
index 14a9b28..d924f57 100644
--- a/backend/tests/test_conversations.py
+++ b/backend/tests/test_conversations.py
@@ -1805,3 +1805,114 @@ class TestOps:
         assert "hunjing_runs_total" in metrics.text
         ready = await client.get("/v1/readyz")
         assert ready.json()["status"] == "ready"
+
+
+@pytest.mark.usefixtures("client")
+class TestSandbox:
+    ISOLATED_MANIFEST = {
+        "permissions": {"data": ["self_input"]},
+        "code": 'result = {"echo": input.get("text", "")}\noutput = result',
+    }
+
+    async def _setup_isolated(self, client, publisher, user) -> str:
+        pub = await client.post(
+            "/v1/plugins/versions",
+            json={"name": "example.worker", "kind": "isolated_process",
+                  "version": "1.0.0", "manifest": self.ISOLATED_MANIFEST},
+            headers=publisher,
+        )
+        assert pub.status_code == 201, pub.text
+        installation = await client.post(
+            "/v1/plugins/example.worker/installations",
+            json={"version": "1.0.0"}, headers=user,
+        )
+        iid = installation.json()["id"]
+        enabled = await client.post(
+            f"/v1/plugin-installations/{iid}/enablings",
+            json={"granted_permissions": ["data:self_input"]}, headers=user,
+        )
+        assert enabled.status_code == 201
+        return iid
+
+    async def test_execution_fails_closed_without_sandbox(self, client) -> None:
+        publisher = await login(client, "sb-pub@example.com")
+        user = await login(client, "sb-user@example.com")
+        iid = await self._setup_isolated(client, publisher, user)
+        resp = await client.post(
+            f"/v1/plugin-installations/{iid}/executions",
+            json={"input": {"text": "hi"}}, headers=user,
+        )
+        assert resp.status_code == 503  # fail-closed：未启用沙箱拒绝执行
+        assert "fail-closed" in resp.json()["detail"]
+
+    async def test_sandboxed_execution_success_timeout_and_failure(self, client) -> None:
+        from app.core.config import get_settings
+
+        get_settings.cache_clear()
+        import os
+
+        os.environ["HUNJING_SANDBOX_ENABLED"] = "true"
+        get_settings.cache_clear()
+        try:
+            publisher = await login(client, "sb2-pub@example.com")
+            user = await login(client, "sb2-user@example.com")
+            iid = await self._setup_isolated(client, publisher, user)
+            # 成功执行：echo 回填
+            ok = await client.post(
+                f"/v1/plugin-installations/{iid}/executions",
+                json={"input": {"text": "魂镜"}}, headers=user,
+            )
+            assert ok.status_code == 201, ok.text
+            assert ok.json()["status"] == "succeeded", ok.text
+            assert ok.json()["output"]["echo"] == "魂镜"
+            assert ok.json()["duration_ms"] is not None
+            # 死循环：墙钟超时被强杀
+            loop_pub = await client.post(
+                "/v1/plugins/versions",
+                json={"name": "example.loop", "kind": "isolated_process",
+                      "version": "1.0.0",
+                      "manifest": {"permissions": {}, "code": "while True: pass"}},
+                headers=publisher,
+            )
+            assert loop_pub.status_code == 201
+            install_loop = await client.post(
+                "/v1/plugins/example.loop/installations",
+                json={"version": "1.0.0"}, headers=user,
+            )
+            lid = install_loop.json()["id"]
+            await client.post(
+                f"/v1/plugin-installations/{lid}/enablings",
+                json={"granted_permissions": []}, headers=user,
+            )
+            timeout = await client.post(
+                f"/v1/plugin-installations/{lid}/executions",
+                json={"input": {}}, headers=user,
+            )
+            assert timeout.json()["status"] == "timeout"
+            assert "wall clock" in timeout.json()["error"]
+            # 抛异常：failed 且含 stderr 摘要
+            await client.post(
+                "/v1/plugins/versions",
+                json={"name": "example.boom", "kind": "isolated_process",
+                      "version": "1.0.0",
+                      "manifest": {"permissions": {}, "code": "raise RuntimeError('炸了')"}},
+                headers=publisher,
+            )
+            install_boom = await client.post(
+                "/v1/plugins/example.boom/installations",
+                json={"version": "1.0.0"}, headers=user,
+            )
+            bid = install_boom.json()["id"]
+            await client.post(
+                f"/v1/plugin-installations/{bid}/enablings",
+                json={"granted_permissions": []}, headers=user,
+            )
+            failed = await client.post(
+                f"/v1/plugin-installations/{bid}/executions",
+                json={"input": {}}, headers=user,
+            )
+            assert failed.json()["status"] == "failed"
+            assert "炸了" in failed.json()["error"]
+        finally:
+            os.environ.pop("HUNJING_SANDBOX_ENABLED", None)
+            get_settings.cache_clear()