diff --git a/backend/app/agent/tools_impl.py b/backend/app/agent/tools_impl.py
index 87420d9..a447a23 100644
--- a/backend/app/agent/tools_impl.py
+++ b/backend/app/agent/tools_impl.py
@@ -14,6 +14,7 @@ from app.agent.tools import Tool
 from app.application.services.job_executor import default_factories, submit_and_run
 from app.application.services.selection_service import SelectionService
 from app.application.services.signal_service import SignalService
+from app.domain.entities.composite import CompositeComponent, CompositeDefinition
 from app.domain.entities.research import (
     BacktestResult,
     FactorTestReport,
@@ -23,12 +24,19 @@ from app.domain.entities.research import (
 from app.domain.entities.selection import SelectionQuery
 from app.domain.entities.signal import SignalRules
 from app.domain.entities.strategy import StrategyDefinition
+from app.infrastructure.persistence.sqlalchemy.repositories.composite_impl import (
+    SqlAlchemyCompositeRepository,
+)
+from app.infrastructure.persistence.sqlalchemy.repositories.factor_impl import (
+    SqlAlchemyFactorRepository,
+)
 from app.infrastructure.persistence.sqlalchemy.repositories.selection_impl import (
     SqlAlchemySelectionRepository,
 )
 from app.infrastructure.persistence.sqlalchemy.repositories.strategy_impl import (
     SqlAlchemyStrategyRepository,
 )
+from app.quant.factors import FactorError, get_factor
 
 
 def _day(text: str) -> date:
@@ -286,6 +294,120 @@ def build_tools(factories: dict | None = None) -> list[Tool]:
             session.commit()
         return f"策略已保存：{saved.id} {saved.name}（factors={[f.name for f in saved.factors]}）"
 
+    def inspect_factor(args: dict) -> str:
+        name = str(_pick(args, "name", ""))
+        with session_factory() as session:
+            row = SqlAlchemyFactorRepository(session).get(name)
+        if row is None:
+            return f"因子 {name} 不在目录（可用列表：GET /api/factors）"
+        return (
+            f"{row.name}：{row.description}\n公式：{row.formula}\n方向："
+            f"{'越高越好' if row.direction == 'higher_is_better' else '越低越好'}"
+            f"（lookback {row.lookback}，输入 {row.requires}）\n简介：{row.brief}"
+        )
+
+    def create_composite_factor(args: dict) -> str:
+        name = str(_pick(args, "name", ""))
+        raw = str(_pick(args, "factors", ""))
+        if not name or not raw:
+            return "请提供 name 与 factors（格式：momentum_60:0.7,volatility_60:0.3）"
+        comps: list[CompositeComponent] = []
+        for part in raw.split(","):
+            if not part.strip():
+                continue
+            seg = part.strip().split(":")
+            fname = seg[0].strip()
+            weight = float(seg[1]) if len(seg) > 1 and seg[1].strip() else 1.0
+            if not fname:
+                continue
+            try:
+                defn, _fn = get_factor(fname)
+            except FactorError as exc:
+                return f"无法创建：{exc}"
+            comps.append(CompositeComponent(name=fname, weight=weight, direction=defn.direction))
+        if not comps:
+            return "未解析到任何因子组件"
+        from app.application.services.job_executor import new_id
+
+        cf = CompositeDefinition(
+            name=name, description=str(_pick(args, "description", "") or ""), components=comps
+        )
+        with session_factory() as session:
+            saved = SqlAlchemyCompositeRepository(session).save(
+                cf.model_copy(update={"id": new_id("CF")})
+            )
+            session.commit()
+        return (
+            f"组合已保存：{saved.id} {saved.name}（"
+            + ", ".join(f"{c.name}:{c.weight}" for c in saved.components)
+            + "）"
+        )
+
+    def get_backtest_result(args: dict) -> str:
+        exp_id = str(_pick(args, "experiment_id", "")).upper()
+        with session_factory() as session:
+            exp = exp_repo_f(session).get(exp_id)
+        if exp is None:
+            return f"Experiment {exp_id} 不存在"
+        try:
+            result = BacktestResult.model_validate_json(exp.result_json)
+        except Exception:  # noqa: BLE001
+            return f"{exp_id} 不是回测结果"
+        sm = result.summary
+        return (
+            f"回测 {exp_id} {sm.start}~{sm.end}：总收益 {sm.total_return_pct:.2f}%，"
+            f"年化 {sm.annual_return_pct:.2f}%，Sharpe {sm.sharpe:.2f}，"
+            f"最大回撤 {sm.max_drawdown_pct:.2f}%，期末 {sm.final_equity:,.0f} 元；"
+            f"交易 {sm.total_trades} 笔胜率 {sm.win_rate_pct:.1f}%；"
+            f"选股记录 {len(result.selection_history)} / 信号 {len(result.signal_history)} / "
+            f"成交 {len(result.fills)}；未建模 {len(result.unimplemented)} 项"
+        )
+
+    def create_experiment(args: dict) -> str:
+        """把成功 Job 兜底归档为 Experiment（研究工具已自动归档；本工具用于补档）。"""
+        job_id = str(_pick(args, "job_id", "")).upper()
+        if not job_id:
+            return "请提供 job_id"
+        from app.application.services.job_executor import new_id
+        from app.domain.entities.research import ExperimentRecord
+        from app.infrastructure.persistence.sqlalchemy.repositories.jobs_impl import (
+            SqlAlchemyJobRepository,
+        )
+
+        with session_factory() as session:
+            job = SqlAlchemyJobRepository(session).get(job_id)
+            if job is None:
+                return f"Job {job_id} 不存在"
+            if job.status != "success" or not job.result_json:
+                return f"Job {job_id} 未成功（无结果可归档）"
+            if job.experiment_id:
+                return f"Job {job_id} 已归档为 {job.experiment_id}"
+            exp_repo = exp_repo_f(session)
+            summary = None
+            try:
+                if job.kind == "backtest":
+                    r = BacktestResult.model_validate_json(job.result_json)
+                    summary = (
+                        f"总收益 {r.summary.total_return_pct:.2f}% · 年化 "
+                        f"{r.summary.annual_return_pct:.2f}% · 回撤 {r.summary.max_drawdown_pct:.2f}%"
+                    )
+            except Exception:  # noqa: BLE001
+                pass
+            exp = ExperimentRecord(
+                id=new_id("EXP"),
+                kind=job.kind,
+                spec_json=job.spec_json,
+                result_json=job.result_json,
+                summary_text=summary,
+                job_id=job.id,
+                created_at=job.created_at,
+            )
+            exp_repo.save(exp)
+            job.experiment_id = exp.id
+            SqlAlchemyJobRepository(session).update(job)
+            session.commit()
+        return f"已归档：{exp.id}（Job {job_id} → Experiment）"
+
     return [
         Tool(
             "search_stocks",
@@ -418,9 +540,52 @@ def build_tools(factories: dict | None = None) -> list[Tool]:
             },
             create_strategy,
         ),
+        Tool(
+            "inspect_factor",
+            "查看因子目录元数据（公式/方向/lookback/输入列）",
+            {
+                "type": "object",
+                "properties": {"name": {"type": "string"}},
+                "required": ["name"],
+            },
+            inspect_factor,
+        ),
+        Tool(
+            "create_composite_factor",
+            "创建并保存多因子组合（factors 格式：momentum_60:0.7,volatility_60:0.3）",
+            {
+                "type": "object",
+                "properties": {
+                    "name": {"type": "string"},
+                    "factors": {"type": "string"},
+                    "description": {"type": "string"},
+                },
+                "required": ["name", "factors"],
+            },
+            create_composite_factor,
+        ),
+        Tool(
+            "get_backtest_result",
+            "读取回测 Experiment 的详细结果（收益/回撤/交易/意图与成交统计）",
+            {
+                "type": "object",
+                "properties": {"experiment_id": {"type": "string"}},
+                "required": ["experiment_id"],
+            },
+            get_backtest_result,
+        ),
+        Tool(
+            "create_experiment",
+            "把成功 Job 兜底归档为 Experiment（补档；研究工具已自动归档）",
+            {
+                "type": "object",
+                "properties": {"job_id": {"type": "string"}},
+                "required": ["job_id"],
+            },
+            create_experiment,
+        ),
     ]
 
-
 def _code_version(job, exp_repo_f) -> str:
     try:
         with default_factories()["session_factory"]() as session:
diff --git a/backend/tests/test_agent_v3_tools.py b/backend/tests/test_agent_v3_tools.py
new file mode 100644
index 0000000..9356376
--- /dev/null
+++ b/backend/tests/test_agent_v3_tools.py
@@ -0,0 +1,132 @@
+"""D4 Agent 补齐至 v3 §25（14 工具）测试：inspect_factor / create_composite_factor /
+get_backtest_result / create_experiment。tmp SQLite + 真实 repo factories。"""
+
+from __future__ import annotations
+
+from datetime import date, datetime
+
+import pytest
+from app.agent.tools_impl import build_tools
+from app.domain.entities.factor import FactorDefinition
+from app.domain.entities.market import Stock
+from app.domain.entities.research import (
+    ExperimentRecord,
+    JobRecord,
+    JobStatus,
+    ResearchSpec,
+)
+from app.infrastructure.persistence.sqlalchemy.base import Base
+from app.infrastructure.persistence.sqlalchemy.repositories.factor_impl import (
+    SqlAlchemyFactorRepository,
+)
+from app.infrastructure.persistence.sqlalchemy.repositories.jobs_impl import (
+    SqlAlchemyExperimentRepository,
+    SqlAlchemyJobRepository,
+)
+from app.infrastructure.persistence.sqlalchemy.repositories.market_impl import (
+    SqlAlchemyDailyBarRepository,
+    SqlAlchemyStockRepository,
+)
+from app.quant.factors import list_factors
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from conftest_quant import bars_dataframe_to_daily_bars, synthetic_daily
+
+_SYMS = ["600000.SH", "600001.SH", "600002.SH"]
+
+
+@pytest.fixture()
+def tools(tmp_path):
+    engine = create_engine(f"sqlite:///{tmp_path / 'agent.db'}", future=True)
+    Base.metadata.create_all(engine)
+    Session = sessionmaker(bind=engine, expire_on_commit=False)
+
+    df = synthetic_daily({s: 0.006 - 0.0015 * i for i, s in enumerate(_SYMS)}, n=320)
+    with Session() as session:
+        SqlAlchemyStockRepository(session).upsert_many(
+            [Stock(symbol=s, name=f"测试{i}", list_date=date(1999, 1, 1)) for i, s in enumerate(_SYMS)]
+        )
+        SqlAlchemyDailyBarRepository(session).upsert_many(bars_dataframe_to_daily_bars(df))
+        SqlAlchemyFactorRepository(session).upsert_many(
+            [FactorDefinition.from_registry_def(d) for d in list_factors()]
+        )
+        # 造一条成功 Job（无 experiment 关联，供 create_experiment 补档）
+        spec = ResearchSpec(
+            type="backtest",
+            universe={"exclude_st": False, "min_listing_days": 0, "symbols": _SYMS},
+            factors=[{"name": "momentum_60", "weight": 1.0}],
+            selection={"top_n": 1},
+            rebalance="monthly",
+            period=(date(2024, 5, 1), date(2024, 8, 31)),
+        )
+        from app.quant.engine import LocalEngine
+
+        result = LocalEngine().run_backtest(df, spec)
+        SqlAlchemyJobRepository(session).create(
+            JobRecord(id="JOB-D4", kind="backtest",
+                      spec_json=spec.model_dump_json(), status=JobStatus.SUCCESS,
+                      result_json=result.model_dump_json(),
+                      experiment_id=None,
+                      created_at=datetime.now(), finished_at=datetime.now())
+        )
+        SqlAlchemyExperimentRepository(session).save(
+            ExperimentRecord(id="EXP-D4", kind="backtest", spec_json=spec.model_dump_json(),
+                             result_json=result.model_dump_json(),
+                             summary_text="d4", job_id="JOB-D4",
+                             created_at=datetime.now())
+        )
+        session.commit()
+
+    factories = {
+        "session_factory": lambda: Session(),
+        "stock_repo_factory": lambda s: SqlAlchemyStockRepository(s),
+        "daily_repo_factory": lambda s: SqlAlchemyDailyBarRepository(s),
+        "experiment_repo_factory": lambda s: SqlAlchemyExperimentRepository(s),
+        "engine": None,
+    }
+    return build_tools(factories=factories)
+
+
+def _invoke(tools, name: str, args: dict) -> str:
+    tool = next(t for t in tools if t.name == name)
+    return tool.invoke(args)
+
+
+class TestV3Tools:
+    def test_tool_count_14(self, tools) -> None:
+        names = {t.name for t in tools}
+        assert len(names) == 14
+        assert {
+            "inspect_factor", "create_composite_factor", "get_backtest_result", "create_experiment"
+        } <= names
+
+    def test_inspect_factor(self, tools) -> None:
+        out = _invoke(tools, "inspect_factor", {"name": "momentum_60"})
+        assert "momentum_60" in out and "公式" in out and "lookback" in out
+        miss = _invoke(tools, "inspect_factor", {"name": "no_such"})
+        assert "不在目录" in miss
+
+    def test_create_composite_factor(self, tools) -> None:
+        out = _invoke(
+            tools, "create_composite_factor",
+            {"name": "动量低波", "factors": "momentum_60:0.7,volatility_60:0.3"},
+        )
+        assert "组合已保存" in out and "CF-" in out
+        bad = _invoke(tools, "create_composite_factor",
+                      {"name": "x", "factors": "no_such:1"})
+        assert "无法创建" in bad
+
+    def test_get_backtest_result(self, tools) -> None:
+        out = _invoke(tools, "get_backtest_result", {"experiment_id": "EXP-D4"})
+        assert "总收益" in out and "成交" in out
+        miss = _invoke(tools, "get_backtest_result", {"experiment_id": "EXP-NONE"})
+        assert "不存在" in miss
+
+    def test_create_experiment_backfills_job(self, tools) -> None:
+        out = _invoke(tools, "create_experiment", {"job_id": "JOB-D4"})
+        assert "已归档" in out and "JOB-D4" in out
+        again = _invoke(tools, "create_experiment", {"job_id": "JOB-D4"})
+        assert "已归档为" in again  # 幂等提示
+        bad = _invoke(tools, "create_experiment", {"job_id": "JOB-NONE"})
+        assert "不存在" in bad