diff --git a/AGENTS.md b/AGENTS.md
index 61cda54..9f53082 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -97,6 +97,28 @@ skiff fetch superpowers
 skiff install-external superpowers
 ```
 
+### 自定义仓库（Custom Sources）
+
+公司或团队维护、且一个仓库中包含多个 skill 时，使用命名 custom source：
+
+```bash
+skiff source add company \
+  git@git.company.com:platform/agent-skills.git \
+  --skills-path skills
+skiff list --source company
+skiff add company/internal-review -g
+```
+
+也可以接入已有本地 checkout：
+
+```bash
+skiff source add company --local ~/code/company-skills --skills-path skills
+```
+
+配置保存在 `~/.config/skiff/config.yaml`，Git source 默认 clone 到
+`~/.local/share/skiff/sources/<source>/`。项目 `.skills.yaml` 只记录逻辑
+source 名称，每台机器独立配置实际仓库地址。
+
 ### 社区（External NPM / GitHub）
 
 推荐使用 Vercel CLI 安装第三方 skill：
@@ -143,6 +165,7 @@ registry.yaml               ←──   skiff add / fetch
 | ---------------- | ---------------------------------- | ------------------------------- |
 | **Owned**        | `skills/<name>/`                   | 本仓库 commit                      |
 | **External Git** | `~/.local/share/skills/externals/` | `skiff fetch`                   |
+| **Custom Source** | `~/.local/share/skiff/sources/` 或本地路径 | `skiff source add/fetch` |
 | **External NPM** | `node_modules/`                    | `npx skills add` / `skills-npm` |
 
 ### 非 Skill 资料分类
@@ -176,6 +199,8 @@ skills:
   - name: superpowers
     source: registry
     ref: main
+  - name: internal-review
+    source: company
 
 targets:          # 可选，默认 all
   - cursor
diff --git a/skiff/README.md b/skiff/README.md
index bb31bf2..c8a44c6 100644
--- a/skiff/README.md
+++ b/skiff/README.md
@@ -13,7 +13,8 @@ cd /path/to/skills   # 本仓库根目录
 
 ## 命令风格
 
-接口对齐 [Vercel skills CLI](https://github.com/vercel-labs/skills) 的 `add` / `remove`，专用于 **~/.skills 自研 skill**。
+接口对齐 [Vercel skills CLI](https://github.com/vercel-labs/skills) 的 `add` / `remove`，
+统一管理 **~/.skills 自研 skill**、命名 custom source 和 registry 外部 skill。
 
 ```bash
 # 浏览可用自研 skill
@@ -56,7 +57,7 @@ skiff bootstrap
 
 | 命令 | 说明 |
 |------|------|
-| `skiff list` | 列出自研 skill 与 registry 中的外部 skill |
+| `skiff list [--source NAME]` | 列出所有来源或指定 source 中的 skill |
 | `skiff status [--target all\|cursor\|claude\|codex]` | 安装状态总览 |
 
 ### 项目初始化
@@ -112,6 +113,40 @@ skiff select --project ~/code/app    # 指定项目
 `skiff add <name>...`。使用 `-a` 限定 Agent 时，该范围会记录在对应的
 skill 条目中，后续 `skiff sync` 不会扩散到其他 Agent。
 
+### Custom source（多-skill 仓库）
+
+公司或团队维护的仓库通常包含多个 skill。使用命名 source 接入：
+
+```bash
+# Git 仓库，默认 clone 到 ~/.local/share/skiff/sources/company
+skiff source add company \
+  git@git.company.com:platform/agent-skills.git \
+  --ref main \
+  --skills-path internal/skills
+
+# 或接入已有本地仓库
+skiff source add company \
+  --local ~/code/company-agent-skills \
+  --skills-path skills
+
+skiff source list
+skiff source fetch company
+skiff list --source company
+skiff add company/code-review -g -a codex
+```
+
+| 命令 | 说明 |
+|------|------|
+| `skiff source add <name> <repo> [--ref REF] [--checkout PATH] [--skills-path PATH]` | 注册并克隆 Git source |
+| `skiff source add <name> --local PATH [--skills-path PATH]` | 接入已有本地仓库 |
+| `skiff source list` / `show <name>` | 查看 source |
+| `skiff source fetch <name>` / `fetch --all` | clone 或 fast-forward 更新 |
+| `skiff source remove <name>` | 移除配置并保留 checkout |
+
+配置保存在 `~/.config/skiff/config.yaml`。Git/SSH 认证复用本机 Git 配置，
+skiff 不保存 token。可以使用 `company/code-review`，也可以使用
+`skiff add code-review --source company`。多个来源包含同名 skill 时，必须明确来源。
+
 ### 项目级
 
 | 命令 | 说明 |
@@ -176,6 +211,7 @@ skiff/
 ├── paths.py         # 路径常量与 Agent 目标
 ├── skills.py        # 自研 skill 发现
 ├── registry.py      # registry.yaml 读写
+├── sources.py       # custom source 配置、发现与 Git 管理
 ├── project.py       # .skills.yaml 管理
 ├── symlinks.py      # 软链创建/检查/修复
 └── yaml_io.py       # 轻量 YAML 解析（无第三方依赖）
@@ -191,6 +227,8 @@ skiff/
 | `SKILLS_DIR` | `~/.skills/skills/` | 自研 skill 目录 |
 | `REGISTRY_FILE` | `~/.skills/registry.yaml` | 外部 skill 注册表 |
 | `EXTERNALS_DIR` | `~/.local/share/skills/externals/` | 已 fetch 的外部仓库；新条目按 repo/ref 共享缓存 |
+| `CONFIG_FILE` | `~/.config/skiff/config.yaml` | custom source 配置 |
+| `SOURCES_DIR` | `~/.local/share/skiff/sources/` | custom Git source 默认 checkout |
 
 ## 注意事项
 
diff --git a/skiff/__init__.py b/skiff/__init__.py
index 3e711ae..8a71d91 100644
--- a/skiff/__init__.py
+++ b/skiff/__init__.py
@@ -1,3 +1,3 @@
 """skiff — Agent Skills 安装与管理 CLI。"""
 
-__version__ = "0.4.0"
+__version__ = "0.5.0"
diff --git a/skiff/cli.py b/skiff/cli.py
index 5024aa6..d9c7888 100644
--- a/skiff/cli.py
+++ b/skiff/cli.py
@@ -16,6 +16,7 @@ from skiff.paths import (
     ALL_TARGETS,
     DRAFTS_DIR,
     EXTERNALS_DIR,
+    CONFIG_FILE,
     SKILLS_DIR,
     SKILLS_HOME,
     TEMPLATE_DIR,
@@ -38,13 +39,23 @@ from skiff.registry import (
 )
 from skiff.selector import SkillChoice, select_skills
 from skiff.skills import (
+    list_custom_skills,
     list_owned_skills,
     owned_skill_path,
     resolve_skill_source,
+    split_skill_spec,
     skill_description,
     validate_skill_dir,
     validate_skill_name,
 )
+from skiff.sources import (
+    fetch_source,
+    load_sources,
+    save_sources,
+    source_checkout,
+    source_skills_root,
+    validate_source_name,
+)
 from skiff.yaml_io import safe_dump
 from skiff.symlinks import check_link, copy_template, create_link, find_repo_root, remove_link
 
@@ -76,7 +87,18 @@ def _collect_skill_names(positional: list[str] | None, flagged: list[str] | None
     return names
 
 
-def _ensure_external_fetched(name: str) -> None:
+def _ensure_source_fetched(name: str, source: str | None = None) -> None:
+    name, source = split_skill_spec(name, source)
+    sources = load_sources()
+    if source in sources:
+        root = source_skills_root(source, sources[source])
+        if not root.is_dir():
+            _print(f"拉取 source: {source}")
+            fetch_source(source, sources[source])
+        return
+    if source not in (None, "registry"):
+        return
+
     registry = load_registry()
     if name not in registry:
         return
@@ -101,9 +123,16 @@ def _ensure_external_fetched(name: str) -> None:
     )
 
 
-def _install_skill(name: str, targets: list[str], project_root: Path | None = None) -> None:
-    _ensure_external_fetched(name)
-    skill_path, _ = resolve_skill_source(name)
+def _install_skill(
+    name: str,
+    targets: list[str],
+    project_root: Path | None = None,
+    *,
+    source: str | None = None,
+) -> str:
+    name, source = split_skill_spec(name, source)
+    _ensure_source_fetched(name, source)
+    skill_path, resolved_source = resolve_skill_source(name, source=source)
     links = [
         (target, agent_skill_dir(target, project_root=project_root) / name)
         for target in targets
@@ -124,7 +153,8 @@ def _install_skill(name: str, targets: list[str], project_root: Path | None = No
 
     for target, _ in links:
         scope = "全局" if project_root is None else "项目"
-        _print(f"已安装 ({scope}/{target}): {name} -> {skill_path}")
+        _print(f"已安装 ({scope}/{target}): {resolved_source}/{name} -> {skill_path}")
+    return resolved_source
 
 
 def _list_installed_names(project_root: Path | None, targets: list[str]) -> list[str]:
@@ -177,18 +207,32 @@ def cmd_list(args: argparse.Namespace) -> None:
     ensure_skills_home()
     owned = list_owned_skills()
     registry = load_registry()
+    custom = (
+        {}
+        if args.source in ("owned", "registry")
+        else list_custom_skills(args.source)
+    )
 
-    _print("自研 (owned):")
-    for name in owned:
-        _print(f"  {name}")
+    if args.source in (None, "owned"):
+        _print("自研 (owned):")
+        for name in owned:
+            _print(f"  {name}")
 
-    _print("\n外部 (registry):")
-    if not registry:
-        _print("  (无)")
-    else:
-        for name, entry in registry.items():
-            repo = entry.get("repo", "?")
-            _print(f"  {name}  ({repo})")
+    if args.source in (None, "registry"):
+        _print("\n外部 (registry):")
+        if not registry:
+            _print("  (无)")
+        else:
+            for name, entry in registry.items():
+                repo = entry.get("repo", "?")
+                _print(f"  {name}  ({repo})")
+
+    for source, names in custom.items():
+        _print(f"\n自定义 ({source}):")
+        if not names:
+            _print("  (无，或 source 尚未 fetch)")
+        for name in names:
+            _print(f"  {name}")
 
 
 def cmd_bootstrap(args: argparse.Namespace) -> None:
@@ -200,8 +244,14 @@ def cmd_bootstrap(args: argparse.Namespace) -> None:
     _print("已安装项目 skill 到所有 agent")
 
 
-def _installed_links(name: str, targets: list[str], project_root: Path | None = None) -> list[tuple[str, Path, Path]]:
-    skill_path, _ = resolve_skill_source(name)
+def _installed_links(
+    name: str,
+    targets: list[str],
+    project_root: Path | None = None,
+    *,
+    source: str | None = None,
+) -> list[tuple[str, Path, Path]]:
+    skill_path, _ = resolve_skill_source(name, source=source)
     rows: list[tuple[str, Path, Path]] = []
     for target in targets:
         link = agent_skill_dir(target, project_root=project_root) / name
@@ -214,16 +264,22 @@ def cmd_status(args: argparse.Namespace) -> None:
     targets = resolve_agent_args(flatten_agent_args(args.agents))
     owned = list_owned_skills()
     registry = load_registry()
-    all_names = owned + [n for n in registry if n not in owned]
+    custom = list_custom_skills()
+    entries = [("owned", name) for name in owned]
+    entries.extend(("registry", name) for name in registry)
+    entries.extend((source, name) for source, names in custom.items() for name in names)
 
     _print(f"skills 仓库: {SKILLS_HOME.resolve()}")
     _print(f"agents: {', '.join(targets)}\n")
 
-    for name in all_names:
-        kind = "owned" if name in owned else "external"
-        _print(f"[{kind}] {name}")
+    for source, name in entries:
+        _print(f"[{source}] {name}")
         try:
-            rows = _installed_links(name, targets)
+            skill_path, _ = resolve_skill_source(name, source=source)
+            rows = [
+                (target, agent_skill_dir(target) / name, skill_path)
+                for target in targets
+            ]
         except SystemExit:
             _print("  (未 fetch)")
             continue
@@ -256,12 +312,24 @@ def cmd_add(args: argparse.Namespace) -> None:
     ensure_skills_home()
 
     if args.list_available:
-        _print_available_skills()
+        if args.source:
+            cmd_list(argparse.Namespace(source=args.source))
+        else:
+            _print_available_skills()
         _print("使用 skiff add <name> 安装，或 skiff add <name> -g 全局安装")
         return
 
     if args.all:
-        names = list_owned_skills()
+        if args.source:
+            if args.source == "owned":
+                names = list_owned_skills()
+            elif args.source == "registry":
+                names = list(load_registry())
+            else:
+                _ensure_source_fetched("", args.source)
+                names = list_custom_skills(args.source)[args.source]
+        else:
+            names = list_owned_skills()
         targets = resolve_agent_args(["*"])
     else:
         names = _collect_skill_names(args.skills, args.skills_flag)
@@ -272,8 +340,20 @@ def cmd_add(args: argparse.Namespace) -> None:
     project_root = None if args.global_scope else _project_root(args.project)
 
     for name in names:
-        validate_skill_name(name)
-        _install_skill(name, targets, project_root=project_root)
+        skill_name, source = split_skill_spec(name, args.source)
+        validate_skill_name(skill_name)
+        resolved_source = _install_skill(
+            skill_name,
+            targets,
+            project_root=project_root,
+            source=source,
+        )
+        if project_root is not None:
+            add_skill_to_manifest(
+                project_root / ".skills.yaml",
+                skill_name,
+                source=resolved_source,
+            )
 
 
 def cmd_select(args: argparse.Namespace) -> None:
@@ -313,6 +393,10 @@ def cmd_select(args: argparse.Namespace) -> None:
         for name, entry in registry.items()
         if name not in collisions
     )
+    choice_sources = {
+        **{name: "owned" for name in owned_names},
+        **{name: "registry" for name in registry if name not in collisions},
+    }
 
     try:
         selected = select_skills(choices)
@@ -329,7 +413,12 @@ def cmd_select(args: argparse.Namespace) -> None:
     successful = set(selected & installed)
     for name in names:
         try:
-            _install_skill(name, targets, project_root=project_root)
+            _install_skill(
+                name,
+                targets,
+                project_root=project_root,
+                source=choice_sources[name],
+            )
             successful.add(name)
         except (OSError, subprocess.CalledProcessError, SystemExit) as exc:
             failures.append((name, str(exc)))
@@ -440,6 +529,94 @@ def cmd_fetch(args: argparse.Namespace) -> None:
         )
 
 
+def cmd_source_add(args: argparse.Namespace) -> None:
+    validate_source_name(args.name)
+    sources = load_sources()
+    if args.name in sources:
+        raise SystemExit(f"source 已存在: {args.name}")
+    if bool(args.repo) == bool(args.local):
+        raise SystemExit("必须且只能指定 Git repo 或 --local")
+    entry: dict[str, str] = {"skills_path": args.skills_path}
+    if args.local:
+        local = Path(args.local).expanduser().resolve()
+        if not local.is_dir():
+            raise SystemExit(f"本地仓库不存在: {local}")
+        entry["local_path"] = str(local)
+    else:
+        entry.update({"repo": args.repo, "ref": args.ref})
+        if args.checkout:
+            entry["checkout"] = str(Path(args.checkout).expanduser().resolve())
+    # 注册前先校验路径不能逃出仓库。
+    source_skills_root(args.name, entry)
+    if not args.local and not args.no_fetch:
+        _print(f"克隆 source: {args.name}")
+        fetch_source(args.name, entry)
+    sources[args.name] = entry
+    save_sources(sources)
+    _print(f"已添加 source: {args.name} ({CONFIG_FILE})")
+
+
+def cmd_source_list(args: argparse.Namespace) -> None:
+    del args
+    sources = load_sources()
+    if not sources:
+        _print("未配置 custom source")
+        return
+    for name, entry in sources.items():
+        kind = "local" if entry.get("local_path") else "git"
+        _print(
+            f"{name} [{kind}] checkout={source_checkout(name, entry)} "
+            f"skills={source_skills_root(name, entry)}"
+        )
+
+
+def cmd_source_show(args: argparse.Namespace) -> None:
+    sources = load_sources()
+    if args.name not in sources:
+        raise SystemExit(f"未配置 source: {args.name}")
+    entry = sources[args.name]
+    _print(f"name: {args.name}")
+    for key, value in entry.items():
+        _print(f"{key}: {value}")
+    _print(f"checkout: {source_checkout(args.name, entry)}")
+    _print(f"skills_root: {source_skills_root(args.name, entry)}")
+
+
+def cmd_source_fetch(args: argparse.Namespace) -> None:
+    sources = load_sources()
+    names = list(sources) if args.all else [args.name]
+    if not names or names == [None]:
+        raise SystemExit("请指定 source 名称，或使用 --all")
+    for name in names:
+        if name not in sources:
+            raise SystemExit(f"未配置 source: {name}")
+        _print(f"更新 source: {name}")
+        fetch_source(name, sources[name])
+
+
+def cmd_source_remove(args: argparse.Namespace) -> None:
+    sources = load_sources()
+    if args.name not in sources:
+        raise SystemExit(f"未配置 source: {args.name}")
+    entry = sources[args.name]
+    if args.delete_checkout and entry.get("local_path"):
+        raise SystemExit("不会删除 --local 指定的仓库")
+    checkout = source_checkout(args.name, entry)
+    if args.delete_checkout and (
+        checkout in (Path("/"), Path.home().resolve()) or not (checkout / ".git").is_dir()
+    ):
+        raise SystemExit(f"拒绝删除不安全或非 Git checkout: {checkout}")
+    sources.pop(args.name)
+    save_sources(sources)
+    _print(f"已移除 source 配置: {args.name}")
+    if args.delete_checkout:
+        import shutil
+
+        if checkout.is_dir():
+            shutil.rmtree(checkout)
+            _print(f"已删除 checkout（不可恢复）: {checkout}")
+
+
 def cmd_enable(args: argparse.Namespace) -> None:
     _warn_deprecated("skiff enable", "skiff add <name>")
     ensure_skills_home()
@@ -447,13 +624,10 @@ def cmd_enable(args: argparse.Namespace) -> None:
     root = _project_root(args.project)
     manifest_path = root / ".skills.yaml"
 
-    registry = load_registry()
-    if args.name in registry:
-        extra = {"source": "registry", "ref": registry[args.name].get("ref", "main")}
-        add_skill_to_manifest(manifest_path, args.name, source="registry", extra=extra)
-    else:
-        owned_skill_path(args.name)
-        add_skill_to_manifest(manifest_path, args.name, source="owned")
+    name, source = split_skill_spec(args.name)
+    _ensure_source_fetched(name, source)
+    _, resolved_source = resolve_skill_source(name, source=source)
+    add_skill_to_manifest(manifest_path, name, source=resolved_source)
 
     targets = resolve_agent_args(flatten_agent_args(args.agents))
     _, data = load_manifest(manifest_path)
@@ -461,8 +635,8 @@ def cmd_enable(args: argparse.Namespace) -> None:
     if manifest_targets:
         targets = [t for t in targets if t in manifest_targets]
 
-    _install_skill(args.name, targets, project_root=root)
-    _print(f"已启用项目 skill: {args.name} @ {root}")
+    _install_skill(name, targets, project_root=root, source=resolved_source)
+    _print(f"已启用项目 skill: {resolved_source}/{name} @ {root}")
 
 
 def cmd_disable(args: argparse.Namespace) -> None:
@@ -492,6 +666,7 @@ def cmd_sync(args: argparse.Namespace) -> None:
 
     for entry in iter_manifest_skills(data):
         name = entry["name"]
+        _ensure_source_fetched(name, entry.get("source"))
         skill_path, _ = resolve_manifest_skill(entry)
         skill_targets = targets
         if entry.get("targets"):
@@ -603,7 +778,7 @@ def cmd_doctor(args: argparse.Namespace) -> None:
         issues += 1
 
     for name in list_owned_skills():
-        for target, link, expected in _installed_links(name, targets):
+        for target, link, expected in _installed_links(name, targets, source="owned"):
             status = check_link(link, expected)
             if status.ok:
                 continue
@@ -623,6 +798,16 @@ def cmd_doctor(args: argparse.Namespace) -> None:
             _err(f"✗ 外部 skill 未 fetch: {name}")
             issues += 1
 
+    for source, entry in load_sources().items():
+        checkout = source_checkout(source, entry)
+        root = source_skills_root(source, entry)
+        if not checkout.is_dir():
+            _err(f"✗ source checkout 不存在: {source} -> {checkout}")
+            issues += 1
+        elif not root.is_dir():
+            _err(f"✗ source skills_path 不存在: {source} -> {root}")
+            issues += 1
+
     if issues == 0:
         _print("\n全部正常")
     else:
@@ -668,7 +853,8 @@ def build_parser() -> argparse.ArgumentParser:
     )
     p_bootstrap.set_defaults(func=cmd_bootstrap)
 
-    p_list = sub.add_parser("list", help="列出 ~/.skills 中的 skill 目录")
+    p_list = sub.add_parser("list", help="列出所有 source 中的 skill")
+    p_list.add_argument("--source", help="只列出指定来源（owned、registry 或 custom source）")
     p_list.set_defaults(func=cmd_list)
 
     p_status = sub.add_parser("status", help="安装状态总览")
@@ -684,6 +870,7 @@ def build_parser() -> argparse.ArgumentParser:
     p_add.add_argument("-s", "--skill", dest="skills_flag", action="append", metavar="SKILL")
     p_add.add_argument("--list", dest="list_available", action="store_true", help="列出可用自研 skill，不安装")
     p_add.add_argument("--all", action="store_true", help="安装全部自研 skill 到全部 agent")
+    p_add.add_argument("--source", help="指定 skill 来源（也可使用 source/name）")
     _add_common_flags(p_add)
     p_add.set_defaults(func=cmd_add)
 
@@ -728,6 +915,40 @@ def build_parser() -> argparse.ArgumentParser:
     p_fetch.add_argument("name", help="registry 名称")
     p_fetch.set_defaults(func=cmd_fetch)
 
+    p_source = sub.add_parser("source", help="管理包含多个 skills 的自定义仓库")
+    source_sub = p_source.add_subparsers(dest="source_command", required=True)
+
+    p_source_add = source_sub.add_parser("add", help="注册 Git 或本地 skill source")
+    p_source_add.add_argument("name", help="source 名称")
+    p_source_add.add_argument("repo", nargs="?", help="Git 仓库 URL")
+    p_source_add.add_argument("--local", help="已有本地仓库路径")
+    p_source_add.add_argument("--ref", default="main", help="Git 分支或 tag（默认 main）")
+    p_source_add.add_argument("--checkout", help="Git checkout 路径")
+    p_source_add.add_argument("--skills-path", default="skills", help="仓库内 skills 父目录")
+    p_source_add.add_argument("--no-fetch", action="store_true", help="仅写配置，不立即 clone")
+    p_source_add.set_defaults(func=cmd_source_add)
+
+    p_source_list = source_sub.add_parser("list", help="列出已配置 source")
+    p_source_list.set_defaults(func=cmd_source_list)
+
+    p_source_show = source_sub.add_parser("show", help="显示 source 详情")
+    p_source_show.add_argument("name")
+    p_source_show.set_defaults(func=cmd_source_show)
+
+    p_source_fetch = source_sub.add_parser("fetch", help="克隆或更新 source")
+    p_source_fetch.add_argument("name", nargs="?")
+    p_source_fetch.add_argument("--all", action="store_true")
+    p_source_fetch.set_defaults(func=cmd_source_fetch)
+
+    p_source_remove = source_sub.add_parser("remove", help="移除 source 配置")
+    p_source_remove.add_argument("name")
+    p_source_remove.add_argument(
+        "--delete-checkout",
+        action="store_true",
+        help="同时永久删除 skiff 管理的 checkout",
+    )
+    p_source_remove.set_defaults(func=cmd_source_remove)
+
     p_enable = sub.add_parser("enable", help=argparse.SUPPRESS)
     p_enable.add_argument("name")
     p_enable.add_argument("-a", "--agent", dest="agents", nargs="+", action="append")
diff --git a/skiff/paths.py b/skiff/paths.py
index a40af1e..11089b9 100644
--- a/skiff/paths.py
+++ b/skiff/paths.py
@@ -11,6 +11,8 @@ TEMPLATE_DIR = SKILLS_DIR / "_template"
 DRAFTS_DIR = SKILLS_HOME / ".drafts"
 REGISTRY_FILE = SKILLS_HOME / "registry.yaml"
 EXTERNALS_DIR = HOME / ".local" / "share" / "skills" / "externals"
+CONFIG_FILE = HOME / ".config" / "skiff" / "config.yaml"
+SOURCES_DIR = HOME / ".local" / "share" / "skiff" / "sources"
 PROJECT_MANIFEST = ".skills.yaml"
 
 AGENT_GLOBAL: dict[str, Path] = {
diff --git a/skiff/project.py b/skiff/project.py
index 0fa33f6..9fe11e5 100644
--- a/skiff/project.py
+++ b/skiff/project.py
@@ -68,12 +68,13 @@ def add_skill_to_manifest(
     item: dict[str, Any] = {"name": name, "source": source}
     if extra:
         item.update(extra)
-    for index, entry in enumerate(entries):
-        if entry["name"] == name:
-            entries[index] = item
-            break
-    else:
+    existing_index = next((i for i, entry in enumerate(entries) if entry["name"] == name), None)
+    if existing_index is None:
         entries.append(item)
+    elif entries[existing_index] == item:
+        return
+    else:
+        entries[existing_index] = item
 
     data["skills"] = [_entry_to_yaml(e) for e in entries]
     save_manifest(file_path, data)
diff --git a/skiff/skills.py b/skiff/skills.py
index 24cbb1d..27cf381 100644
--- a/skiff/skills.py
+++ b/skiff/skills.py
@@ -7,6 +7,7 @@ from pathlib import Path
 
 from skiff.paths import SKILLS_DIR, TEMPLATE_DIR, ensure_skills_home
 from skiff.registry import external_skill_path, load_registry
+from skiff.sources import list_source_skills, load_sources, source_skills_root
 
 
 def list_owned_skills() -> list[str]:
@@ -31,26 +32,81 @@ def owned_skill_path(name: str) -> Path:
     return path
 
 
+def split_skill_spec(spec: str, source: str | None = None) -> tuple[str, str | None]:
+    if "/" not in spec:
+        return spec, source
+    qualified_source, name = spec.split("/", 1)
+    if not qualified_source or not name or "/" in name:
+        raise SystemExit(f"skill 限定名称无效: {spec!r}（应为 source/name）")
+    if source and source != qualified_source:
+        raise SystemExit(
+            f"skill 来源冲突: {spec!r} 与 --source {source!r} 不一致"
+        )
+    return name, qualified_source
+
+
+def list_custom_skills(source: str | None = None) -> dict[str, list[str]]:
+    sources = load_sources()
+    if source:
+        if source not in sources:
+            raise SystemExit(f"未配置 source: {source}")
+        return {source: list_source_skills(source, sources[source])}
+    return {name: list_source_skills(name, entry) for name, entry in sources.items()}
+
+
 def resolve_skill_source(name: str, *, source: str | None = None) -> tuple[Path, str]:
-    """返回 (skill_path, kind)，kind 为 owned 或 external。"""
+    """返回 (skill_path, source)，未指定来源时拒绝同名歧义。"""
     ensure_skills_home()
+    name, source = split_skill_spec(name, source)
 
     owned = SKILLS_DIR / name
-    if source in (None, "owned") and (owned / "SKILL.md").is_file():
+    if source == "owned":
+        if not (owned / "SKILL.md").is_file():
+            raise SystemExit(f"owned source 中找不到 skill: {name}")
         return owned, "owned"
 
     registry = load_registry()
-    if source in (None, "registry") and name in registry:
+    if source == "registry":
+        if name not in registry:
+            raise SystemExit(f"registry 中找不到 skill: {name}")
         path = external_skill_path(name, registry[name])
         if not (path / "SKILL.md").is_file():
             raise SystemExit(
                 f"外部 skill {name!r} 尚未 fetch 或 path 中缺少 SKILL.md。"
                 f"请运行: skiff fetch {name}"
             )
-        return path, "external"
+        return path, "registry"
 
+    sources = load_sources()
+    if source:
+        if source not in sources:
+            raise SystemExit(
+                f"项目依赖 source {source!r}，但本机尚未配置。"
+                f"请运行: skiff source add {source} <repo>"
+            )
+        path = source_skills_root(source, sources[source]) / name
+        if not (path / "SKILL.md").is_file():
+            raise SystemExit(f"source {source!r} 中找不到 skill: {name}")
+        return path, source
+
+    candidates: list[tuple[Path, str]] = []
     if (owned / "SKILL.md").is_file():
-        return owned, "owned"
+        candidates.append((owned, "owned"))
+    if name in registry:
+        candidates.append((external_skill_path(name, registry[name]), "registry"))
+    for source_name, entry in sources.items():
+        path = source_skills_root(source_name, entry) / name
+        if (path / "SKILL.md").is_file():
+            candidates.append((path, source_name))
+
+    if len(candidates) > 1:
+        choices = ", ".join(f"{candidate_source}/{name}" for _, candidate_source in candidates)
+        raise SystemExit(f"skill 名称存在多个来源，请明确指定: {choices}")
+    if candidates:
+        path, resolved_source = candidates[0]
+        if resolved_source == "registry" and not path.exists():
+            raise SystemExit(f"外部 skill {name!r} 尚未 fetch。请先运行: skiff fetch {name}")
+        return path, resolved_source
 
     raise SystemExit(f"找不到 skill: {name}")
 
diff --git a/skiff/sources.py b/skiff/sources.py
new file mode 100644
index 0000000..bbc9811
--- /dev/null
+++ b/skiff/sources.py
@@ -0,0 +1,106 @@
+"""命名 custom skill source 的配置、发现与 Git 管理。"""
+
+from __future__ import annotations
+
+import subprocess
+from pathlib import Path
+from typing import Any
+
+from skiff import yaml_io
+from skiff.paths import CONFIG_FILE, SOURCES_DIR
+
+RESERVED_SOURCES = {"owned", "registry"}
+
+
+def validate_source_name(name: str) -> None:
+    from skiff.skills import validate_skill_name
+
+    validate_skill_name(name)
+    if name in RESERVED_SOURCES:
+        raise SystemExit(f"source 名称为保留字: {name}")
+
+
+def load_sources(path: Path | None = None) -> dict[str, dict[str, Any]]:
+    path = path or CONFIG_FILE
+    if not path.is_file():
+        return {}
+    data = yaml_io.safe_load(path.read_text(encoding="utf-8")) or {}
+    if not isinstance(data, dict):
+        raise SystemExit(f"skiff 配置格式错误: {path}")
+    raw = data.get("sources", {})
+    if raw is None:
+        return {}
+    if not isinstance(raw, dict):
+        raise SystemExit(f"skiff 配置 sources 格式错误: {path}")
+    return {str(name): entry for name, entry in raw.items() if isinstance(entry, dict)}
+
+
+def save_sources(sources: dict[str, dict[str, Any]], path: Path | None = None) -> None:
+    path = path or CONFIG_FILE
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(
+        yaml_io.safe_dump({"sources": sources}, allow_unicode=True, sort_keys=False),
+        encoding="utf-8",
+    )
+
+
+def source_checkout(name: str, entry: dict[str, Any]) -> Path:
+    local_path = entry.get("local_path")
+    if local_path:
+        return Path(str(local_path)).expanduser().resolve()
+    checkout = entry.get("checkout")
+    if checkout:
+        return Path(str(checkout)).expanduser().resolve()
+    return (SOURCES_DIR / name).resolve()
+
+
+def source_skills_root(name: str, entry: dict[str, Any]) -> Path:
+    checkout = source_checkout(name, entry)
+    raw_subpath = str(entry.get("skills_path", "skills") or "skills")
+    subpath = Path(raw_subpath)
+    if subpath.is_absolute():
+        raise SystemExit(f"source {name!r} 的 skills_path 必须是仓库内相对路径")
+    root = (checkout / subpath).resolve()
+    try:
+        root.relative_to(checkout)
+    except ValueError:
+        raise SystemExit(f"source {name!r} 的 skills_path 不能超出仓库目录") from None
+    return root
+
+
+def list_source_skills(name: str, entry: dict[str, Any]) -> list[str]:
+    root = source_skills_root(name, entry)
+    if not root.is_dir():
+        return []
+    return [
+        item.name
+        for item in sorted(root.iterdir())
+        if item.is_dir() and not item.name.startswith("_") and (item / "SKILL.md").is_file()
+    ]
+
+
+def fetch_source(name: str, entry: dict[str, Any]) -> Path:
+    if entry.get("local_path"):
+        checkout = source_checkout(name, entry)
+        if not checkout.is_dir():
+            raise SystemExit(f"source {name!r} 的本地仓库不存在: {checkout}")
+        return checkout
+
+    repo = entry.get("repo")
+    if not repo:
+        raise SystemExit(f"source {name!r} 缺少 repo 或 local_path")
+    checkout = source_checkout(name, entry)
+    ref = str(entry.get("ref", "main") or "main")
+    if checkout.exists():
+        if not (checkout / ".git").exists():
+            raise SystemExit(f"source checkout 已存在但不是 Git 仓库: {checkout}")
+        subprocess.run(["git", "-C", str(checkout), "fetch", "--all", "--tags"], check=True)
+        subprocess.run(["git", "-C", str(checkout), "checkout", ref], check=True)
+        subprocess.run(["git", "-C", str(checkout), "pull", "--ff-only"], check=True)
+    else:
+        checkout.parent.mkdir(parents=True, exist_ok=True)
+        subprocess.run(
+            ["git", "clone", "--branch", ref, "--", str(repo), str(checkout)],
+            check=True,
+        )
+    return checkout
diff --git a/tests/test_custom_sources.py b/tests/test_custom_sources.py
new file mode 100644
index 0000000..1befa54
--- /dev/null
+++ b/tests/test_custom_sources.py
@@ -0,0 +1,204 @@
+from __future__ import annotations
+
+import os
+import subprocess
+import sys
+import tempfile
+import unittest
+from pathlib import Path
+
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+
+
+def write_skill(root: Path, name: str) -> Path:
+    skill = root / name
+    skill.mkdir(parents=True)
+    skill.joinpath("SKILL.md").write_text(
+        f"---\nname: {name}\ndescription: >-\n"
+        f"  测试 {name} skill。\n---\n\n# {name}\n",
+        encoding="utf-8",
+    )
+    return skill
+
+
+class CustomSourceTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self.temp_dir = tempfile.TemporaryDirectory()
+        self.home = Path(self.temp_dir.name)
+        self.skills_home = self.home / ".skills"
+        (self.skills_home / "skills").mkdir(parents=True)
+        (self.skills_home / "registry.yaml").write_text("", encoding="utf-8")
+
+    def tearDown(self) -> None:
+        self.temp_dir.cleanup()
+
+    def run_skiff(self, *args: str) -> subprocess.CompletedProcess[str]:
+        env = os.environ.copy()
+        env["HOME"] = str(self.home)
+        env["PYTHONPATH"] = str(REPO_ROOT)
+        return subprocess.run(
+            [sys.executable, "-m", "skiff", *args],
+            cwd=REPO_ROOT,
+            env=env,
+            text=True,
+            capture_output=True,
+            check=False,
+        )
+
+    def test_local_source_lists_and_installs_qualified_skill(self) -> None:
+        company = self.home / "company"
+        expected = write_skill(company / "internal" / "skills", "code-review")
+
+        added = self.run_skiff(
+            "source",
+            "add",
+            "company",
+            "--local",
+            str(company),
+            "--skills-path",
+            "internal/skills",
+        )
+        listed = self.run_skiff("list", "--source", "company")
+        installed = self.run_skiff("add", "company/code-review", "-g", "-a", "codex")
+
+        self.assertEqual(added.returncode, 0, added.stderr)
+        self.assertEqual(listed.returncode, 0, listed.stderr)
+        self.assertIn("code-review", listed.stdout)
+        self.assertEqual(installed.returncode, 0, installed.stderr)
+        link = self.home / ".codex" / "skills" / "code-review"
+        self.assertTrue(link.is_symlink())
+        self.assertEqual(link.resolve(), expected.resolve())
+        config = self.home / ".config" / "skiff" / "config.yaml"
+        self.assertIn("company:", config.read_text(encoding="utf-8"))
+
+    def test_project_add_persists_resolved_source_in_manifest(self) -> None:
+        company = self.home / "company"
+        expected = write_skill(company / "skills", "code-review")
+        project = self.home / "project"
+        project.mkdir()
+        added = self.run_skiff("source", "add", "company", "--local", str(company))
+        self.assertEqual(added.returncode, 0, added.stderr)
+
+        result = self.run_skiff(
+            "add",
+            "company/code-review",
+            "--project",
+            str(project),
+            "-a",
+            "codex",
+        )
+
+        self.assertEqual(result.returncode, 0, result.stderr)
+        manifest = project.joinpath(".skills.yaml").read_text(encoding="utf-8")
+        self.assertIn('name: "code-review"', manifest)
+        self.assertIn("source: company", manifest)
+        self.assertEqual(
+            (project / ".agents" / "skills" / "code-review").resolve(),
+            expected.resolve(),
+        )
+
+    def test_project_add_updates_manifest_when_source_changes(self) -> None:
+        write_skill(self.skills_home / "skills", "code-review")
+        company = self.home / "company"
+        write_skill(company / "skills", "code-review")
+        project = self.home / "project"
+        project.mkdir()
+        project.joinpath(".skills.yaml").write_text(
+            "skills:\n  - code-review\n",
+            encoding="utf-8",
+        )
+        added = self.run_skiff("source", "add", "company", "--local", str(company))
+        self.assertEqual(added.returncode, 0, added.stderr)
+
+        result = self.run_skiff(
+            "add",
+            "company/code-review",
+            "--project",
+            str(project),
+            "-a",
+            "codex",
+        )
+
+        self.assertEqual(result.returncode, 0, result.stderr)
+        manifest = project.joinpath(".skills.yaml").read_text(encoding="utf-8")
+        self.assertIn("source: company", manifest)
+
+    def test_unqualified_duplicate_requires_explicit_source(self) -> None:
+        write_skill(self.skills_home / "skills", "code-review")
+        company = self.home / "company"
+        write_skill(company / "skills", "code-review")
+        added = self.run_skiff("source", "add", "company", "--local", str(company))
+        self.assertEqual(added.returncode, 0, added.stderr)
+
+        result = self.run_skiff("add", "code-review", "-g", "-a", "codex")
+
+        self.assertNotEqual(result.returncode, 0)
+        self.assertIn("owned/code-review", result.stderr)
+        self.assertIn("company/code-review", result.stderr)
+
+    def test_sync_uses_manifest_source(self) -> None:
+        company = self.home / "company"
+        expected = write_skill(company / "skills", "code-review")
+        project = self.home / "project"
+        project.mkdir()
+        project.joinpath(".skills.yaml").write_text(
+            "skills:\n  - name: code-review\n    source: company\n"
+            "targets:\n  - codex\n",
+            encoding="utf-8",
+        )
+        added = self.run_skiff("source", "add", "company", "--local", str(company))
+        self.assertEqual(added.returncode, 0, added.stderr)
+
+        result = self.run_skiff("sync", "--project", str(project), "-a", "codex")
+
+        self.assertEqual(result.returncode, 0, result.stderr)
+        link = project / ".agents" / "skills" / "code-review"
+        self.assertEqual(link.resolve(), expected.resolve())
+
+    def test_sync_reports_missing_machine_source(self) -> None:
+        project = self.home / "project"
+        project.mkdir()
+        project.joinpath(".skills.yaml").write_text(
+            "skills:\n  - name: code-review\n    source: company\n",
+            encoding="utf-8",
+        )
+
+        result = self.run_skiff("sync", "--project", str(project), "-a", "codex")
+
+        self.assertNotEqual(result.returncode, 0)
+        self.assertIn("本机尚未配置", result.stderr)
+        self.assertIn("skiff source add company", result.stderr)
+
+    def test_git_source_is_cloned_to_default_checkout(self) -> None:
+        upstream = self.home / "upstream"
+        write_skill(upstream / "skills", "release-check")
+        subprocess.run(["git", "init", "-b", "main", str(upstream)], check=True, capture_output=True)
+        subprocess.run(["git", "-C", str(upstream), "add", "."], check=True)
+        subprocess.run(
+            [
+                "git",
+                "-C",
+                str(upstream),
+                "-c",
+                "user.name=Test",
+                "-c",
+                "user.email=test@example.com",
+                "commit",
+                "-m",
+                "initial",
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+        result = self.run_skiff("source", "add", "company", str(upstream))
+
+        self.assertEqual(result.returncode, 0, result.stderr)
+        checkout = self.home / ".local" / "share" / "skiff" / "sources" / "company"
+        self.assertTrue((checkout / ".git").is_dir())
+        self.assertTrue((checkout / "skills" / "release-check" / "SKILL.md").is_file())
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/tests/test_select.py b/tests/test_select.py
index 0be534a..923a84b 100644
--- a/tests/test_select.py
+++ b/tests/test_select.py
@@ -139,7 +139,7 @@ class SelectCommandTests(unittest.TestCase):
                 patch.object(
                     cli,
                     "_install_skill",
-                    side_effect=lambda name, targets, project_root: installed.append(name),
+                    side_effect=lambda name, targets, project_root, **kwargs: installed.append(name),
                 ),
             ):
                 cli.cmd_select(args)
@@ -195,7 +195,7 @@ class SelectCommandTests(unittest.TestCase):
             links["claude"].mkdir(parents=True)
 
             with (
-                patch.object(cli, "_ensure_external_fetched"),
+                patch.object(cli, "_ensure_source_fetched"),
                 patch.object(cli, "resolve_skill_source", return_value=(skill, "owned")),
                 patch.object(
                     cli,