diff --git a/agentdescent/cli.py b/agentdescent/cli.py
index 0e487bd0..eb13025c 100644
--- a/agentdescent/cli.py
+++ b/agentdescent/cli.py
@@ -47,7 +47,8 @@
 
 from . import runstore
 from .evolvespec import (KINDS, EvolveSpec, SpecError, budget_round_overshoot_warning,
-                         compose, estimate, load_spec, _POLICY_SLOTS)
+                         compose, estimate, fold_kind, load_spec, resolve_kind,
+                         _POLICY_SLOTS)
 
 __all__ = ["main", "doctor_report", "starter_spec"]
 
@@ -1105,6 +1106,8 @@ def write_starter_spec(
         if value is not None and (isinstance(value, bool) or not isinstance(value, int)
                                   or value < 1):
             raise ValueError(f"{flag} must be an integer >= 1, got {value!r}")
+    if kind is not None:
+        kind = resolve_kind(kind, where="--kind")
     agent_explicit = agent is not None
     if agent is None:
         agent, found = default_agent_ref()
@@ -3341,8 +3344,8 @@ def cmd_algorithms(a: argparse.Namespace) -> int:
               file=sys.stderr)
     as_json = getattr(a, "json", False)
     if a.action in (None, "list"):
-        if a.kind is not None and a.kind not in KINDS:
-            raise SpecError(f"--kind must be one of {list(KINDS)}, got {a.kind!r}")
+        if a.kind is not None:
+            a.kind = resolve_kind(a.kind, where="--kind")
         found = algorithms.listing(a.kind)
         # Same explanation MCP list_algorithms already returns for this kind
         # (#799): policy_slot evolves a policy value, so no named algorithm
@@ -3441,11 +3444,13 @@ def algorithms_run_payload(
     except algorithms.AlgorithmError as e:
         return {"ok": False, "error": str(e), "_stage": "pre"}
     out = out or f"agentdescent.{name}.spec.json"
-    if kind is not None and kind not in KINDS:
-        # The group-level --kind is free text; fail closed with the real choices
-        # before anything is written (#688).
-        return {"ok": False, "_stage": "pre",
-                "error": f"--kind must be one of {list(KINDS)}, got {kind!r}"}
+    if kind is not None:
+        # The group-level --kind is free text; fold aliases and fail closed
+        # with the real choices before anything is written (#688, #882).
+        try:
+            kind = resolve_kind(kind, where="--kind")
+        except SpecError as e:
+            return {"ok": False, "_stage": "pre", "error": str(e)}
     # The name is positional here: say so, route the one-file fix through
     # `algorithms run`, and name --kind when the kind was only guessed (#702).
     alg = algorithms.get(name)
@@ -4617,8 +4622,7 @@ def build_parser() -> argparse.ArgumentParser:
 
     s = sub.add_parser("init", help="write a starter spec for a path")
     s.add_argument("path")
-    s.add_argument("--kind", choices=("text", "skill_dir", "skill_library", "agent_dir",
-                                  "agent_code", "plugin", "policy_slot"))
+    s.add_argument("--kind", type=fold_kind, choices=KINDS)
     s.add_argument("--data", help="cases file, or a module:attribute problems ref for policy_slot")
     s.add_argument("--agent", default=None,
                    help="worker agent short name (default: the first of claude_code, "
@@ -4905,8 +4909,7 @@ def build_parser() -> argparse.ArgumentParser:
                     help="endpoint URL for that model (written as default_base_url)")
     s2.add_argument("--key-env", dest="key_env", default=None,
                     help="environment variable holding its key")
-    s2.add_argument("--kind", choices=("text", "skill_dir", "skill_library", "agent_dir",
-                                       "agent_code", "plugin", "policy_slot"),
+    s2.add_argument("--kind", type=fold_kind, choices=KINDS,
                     default=argparse.SUPPRESS,
                     help="spec kind (default: guessed from PATH, as init --kind)")
     s2.add_argument("--out", help="where to write the spec "
diff --git a/agentdescent/evolvespec.py b/agentdescent/evolvespec.py
index 22778265..a7bfd01c 100644
--- a/agentdescent/evolvespec.py
+++ b/agentdescent/evolvespec.py
@@ -45,6 +45,7 @@
 from __future__ import annotations
 
 import csv
+import difflib
 import json
 import os
 import shlex
@@ -73,6 +74,8 @@
     "KINDS",
     "KIND_ROWS",
     "SHORT_REFS",
+    "fold_kind",
+    "resolve_kind",
     "Composition",
     "EvolveSpec",
     "SpecError",
@@ -89,6 +92,40 @@
 KINDS: Tuple[str, ...] = ("text", "skill_dir", "skill_library", "agent_dir",
                           "agent_code", "plugin", "policy_slot")
 
+
+def fold_kind(value: Any) -> Any:
+    """Canonical :data:`KINDS` entry when ``value`` is a case/hyphen alias.
+
+    ``skill-library`` and ``SKILL_LIBRARY`` become ``skill_library``. A value
+    that is not such an alias is returned unchanged, so argparse ``choices=``
+    can still report an unknown flag.
+    """
+    if isinstance(value, str):
+        folded = value.strip().casefold().replace("-", "_")
+        if folded in KINDS:
+            return folded
+    return value
+
+
+def resolve_kind(value: Any, *, where: str = "kind") -> str:
+    """The :data:`KINDS` entry ``value`` names, ignoring case and ``-`` vs ``_``.
+
+    Raises :class:`SpecError` when nothing matches. A near-miss typo
+    (``skil_library``) appends ``did you mean 'skill_library'?``.
+    """
+    folded = fold_kind(value)
+    if folded in KINDS:
+        return folded
+    shown = list(KINDS) if where.startswith("-") else KINDS
+    msg = f"{where} must be one of {shown}, got {value!r}"
+    if isinstance(value, str) and value.strip():
+        close = difflib.get_close_matches(
+            value.strip().casefold().replace("-", "_"), list(KINDS), n=1,
+            cutoff=0.75)
+        if close:
+            msg += f"; did you mean {close[0]!r}?"
+    raise SpecError(msg)
+
 #: The composition table, for readers and for the test that checks it against
 #: the quickstarts. Values are the *names* of what is assembled; :func:`compose`
 #: is the code.
@@ -265,6 +302,12 @@ class EvolveSpec:
     record_rollouts: bool = True
     version: int = 1
 
+    def __post_init__(self) -> None:
+        # Aliases such as ``skill-library`` become the canonical kind so later
+        # checks (absolutise, compose) see ``skill_library``. Unknown values
+        # stay as written; :func:`compose` / :func:`resolve_kind` name them.
+        self.kind = fold_kind(self.kind)
+
     # -- (de)serialisation ------------------------------------------------
 
     @classmethod
@@ -1117,8 +1160,9 @@ def compose(spec: EvolveSpec, *, usage: Optional[Usage] = None,
     defaults the kind wants. Raises :class:`SpecError` for anything the spec
     gets wrong, *before* a single rollout runs -- which is what ``plan`` is for.
     """
-    if spec.kind not in KINDS:
-        raise SpecError(f"kind must be one of {KINDS}, got {spec.kind!r}")
+    resolved = resolve_kind(spec.kind)
+    if resolved != spec.kind:
+        spec = replace(spec, kind=resolved)
     if spec.agent is None:
         raise SpecError("agent is required (for kind='text' it is the model)")
     if spec.version != 1:
diff --git a/agentdescent/mcp.py b/agentdescent/mcp.py
index 88d72772..1ed85d9c 100644
--- a/agentdescent/mcp.py
+++ b/agentdescent/mcp.py
@@ -428,10 +428,17 @@ def doctor(self, home: Optional[str] = None) -> Dict[str, Any]:
 
     def list_algorithms(self, kind: Optional[str] = None) -> Dict[str, Any]:
         from . import algorithms
-        from .evolvespec import KINDS
+        from .evolvespec import KINDS, SpecError, resolve_kind
 
-        if kind is not None and kind not in KINDS:
-            return {"error": f"unknown kind {kind!r}; choose from {list(KINDS)}"}
+        if kind is not None:
+            try:
+                kind = resolve_kind(kind)
+            except SpecError as e:
+                extra = ""
+                text = str(e)
+                if "did you mean" in text:
+                    extra = "; " + text.split("; ", 1)[1]
+                return {"error": f"unknown kind {kind!r}; choose from {list(KINDS)}{extra}"}
         payload: Dict[str, Any] = {
             "algorithms": [a.describe() for a in algorithms.listing(kind)],
             "surface": "card",
diff --git a/changelog.d/882-kind-aliases.md b/changelog.d/882-kind-aliases.md
new file mode 100644
index 00000000..406e946f
--- /dev/null
+++ b/changelog.d/882-kind-aliases.md
@@ -0,0 +1,4 @@
+Fixed
+`--kind` and spec `kind` now fold case and `-`/`_` (`skill-library` →
+`skill_library`) and a near-miss typo ends with "did you mean 'skill_library'?",
+matching how algorithm and parameter names already resolve (#882).
diff --git a/tests/test_algorithms.py b/tests/test_algorithms.py
index d2951957..d81257ad 100644
--- a/tests/test_algorithms.py
+++ b/tests/test_algorithms.py
@@ -489,7 +489,11 @@ def test_mcp_lists_and_describes_the_registry():
         ["archive_selection", "evoskill"]
     assert [a["name"] for a in t.list_algorithms("agent_dir")["algorithms"]] == \
         ["archive_selection", "evoskill"]
+    assert [a["name"] for a in t.list_algorithms("skill-library")["algorithms"]] == \
+        [a["name"] for a in t.list_algorithms("skill_library")["algorithms"]]
     assert "unknown kind" in t.list_algorithms("nope")["error"]
+    err = t.list_algorithms("skil_library")["error"]
+    assert "unknown kind" in err and "did you mean 'skill_library'?" in err
     card = t.describe_algorithm("rrsi")
     assert card["name"] == "rrsi" and any(p["name"] == "b_max" for p in card["params"])
     assert "unknown algorithm" in t.describe_algorithm("nope")["error"]
diff --git a/tests/test_cli_algorithms_bare.py b/tests/test_cli_algorithms_bare.py
index ee838e9f..f49a741c 100644
--- a/tests/test_cli_algorithms_bare.py
+++ b/tests/test_cli_algorithms_bare.py
@@ -49,3 +49,27 @@ def test_bare_algorithms_bad_kind_names_the_flag(capsys):
 def test_show_refuses_kind(capsys):
     assert cli.main(["algorithms", "--kind", "text", "show", "gepa"]) == 2
     assert "--kind" in capsys.readouterr().err
+
+
+def test_list_kind_folds_hyphen_and_case(capsys):
+    """#882: `--kind skill-library` / `SKILL_LIBRARY` filter like `skill_library`."""
+    assert cli.main(["algorithms", "list", "--kind", "skill_library", "--json"]) == 0
+    canonical = [card["name"] for card in json.loads(capsys.readouterr().out)]
+    assert "evoskill" in canonical and "archive_selection" in canonical
+    assert "gepa" not in canonical
+    for alias in ("skill-library", "SKILL_LIBRARY"):
+        assert cli.main(["algorithms", "list", "--kind", alias, "--json"]) == 0
+        assert [card["name"] for card in json.loads(capsys.readouterr().out)] == canonical
+        assert cli.main(["algorithms", "--kind", alias, "--json"]) == 0
+        assert [card["name"] for card in json.loads(capsys.readouterr().out)] == canonical
+
+
+def test_list_kind_suggests_a_near_miss(capsys):
+    assert cli.main(["algorithms", "list", "--kind", "skil_library"]) == 2
+    err = capsys.readouterr().err
+    assert "--kind must be one of" in err
+    assert "did you mean 'skill_library'?" in err
+    assert cli.main(["--json", "algorithms", "list", "--kind", "skil_library"]) == 2
+    payload = json.loads(capsys.readouterr().out)
+    assert payload["ok"] is False
+    assert "did you mean 'skill_library'?" in payload["error"]
diff --git a/tests/test_evolvespec.py b/tests/test_evolvespec.py
index 36e5376a..81d38581 100644
--- a/tests/test_evolvespec.py
+++ b/tests/test_evolvespec.py
@@ -17,7 +17,8 @@
 )
 from agentdescent.advantage import AdvantageAcceptance, AdvantageConflict
 from agentdescent.evolvespec import (
-    KIND_ROWS, KINDS, SHORT_REFS, build_policies, estimate, to_ref,
+    KIND_ROWS, KINDS, SHORT_REFS, build_policies, estimate, fold_kind,
+    resolve_kind, to_ref,
 )
 from agentdescent.evolution import SeededAppendRules, SingleSlot
 from agentdescent.fusion import KeepContradictions, ReflectiveFusion
@@ -104,6 +105,39 @@ def test_every_kind_has_a_row_in_the_composition_table():
         assert set(row) == {"strategy", "run", "propose", "reward", "blast_radius"}
 
 
+@pytest.mark.parametrize("raw, canonical", [
+    ("skill-library", "skill_library"),
+    ("SKILL_LIBRARY", "skill_library"),
+    ("skill-dir", "skill_dir"),
+    ("Text", "text"),
+    ("policy-slot", "policy_slot"),
+    ("AGENT_CODE", "agent_code"),
+])
+def test_resolve_kind_folds_hyphen_and_case(raw, canonical):
+    """#882: kind aliases match how algorithm / param names already fold."""
+    assert fold_kind(raw) == canonical
+    assert resolve_kind(raw) == canonical
+
+
+def test_from_dict_stores_the_canonical_kind(tmp_path):
+    spec = _dir_spec(str(tmp_path), kind="skill-library")
+    assert spec.kind == "skill_library"
+
+
+def test_resolve_kind_suggests_a_near_miss():
+    with pytest.raises(SpecError, match=r"did you mean 'skill_library'\?"):
+        resolve_kind("skil_library")
+    with pytest.raises(SpecError, match=r"--kind must be one of") as e:
+        resolve_kind("skil_library", where="--kind")
+    assert "did you mean 'skill_library'?" in str(e.value)
+
+
+def test_resolve_kind_unknown_has_no_guess():
+    with pytest.raises(SpecError, match="kind must be one of") as e:
+        resolve_kind("nope")
+    assert "did you mean" not in str(e.value)
+
+
 def test_every_short_ref_resolves_to_a_public_factory():
     for name, target in SHORT_REFS.items():
         assert ":" in target
diff --git a/tests/test_guess_kind_skill_library.py b/tests/test_guess_kind_skill_library.py
index 63cfef39..f0104d7f 100644
--- a/tests/test_guess_kind_skill_library.py
+++ b/tests/test_guess_kind_skill_library.py
@@ -68,3 +68,32 @@ def test_algorithms_run_evoskill_on_library(tmp_path, capsys, monkeypatch):
                       .read_text(encoding="utf-8"))
     assert spec["kind"] == "skill_library"
     assert spec["algorithm"]["name"] == "evoskill"
+
+
+
+def test_init_kind_alias_writes_canonical_skill_library(tmp_path, capsys, monkeypatch):
+    """#882: `init --kind skill-library` writes the same spec as `--kind skill_library`."""
+    monkeypatch.chdir(tmp_path)
+    lib = tmp_path / "skills"
+    _skill(lib, "alpha")
+    _skill(lib, "beta")
+    assert cli.main(["init", "skills", "--kind", "skill-library", "--json"]) == 0
+    out = json.loads(capsys.readouterr().out)
+    assert out["kind"] == "skill_library"
+    spec = json.loads(Path(out["spec"]).read_text(encoding="utf-8"))
+    assert spec["kind"] == "skill_library"
+    assert spec["layout"] == "skill_library"
+
+
+def test_algorithms_run_kind_alias_on_library(tmp_path, capsys, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    lib = tmp_path / "skills"
+    _skill(lib, "alpha")
+    _skill(lib, "beta")
+    cli.main(["algorithms", "run", "evoskill", "skills",
+              "--kind", "SKILL_LIBRARY", "--json"])
+    capsys.readouterr()
+    spec = json.loads((tmp_path / "agentdescent.evoskill.spec.json")
+                      .read_text(encoding="utf-8"))
+    assert spec["kind"] == "skill_library"
+    assert spec["algorithm"]["name"] == "evoskill"