diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index 77f11fd5..de6cc8e2 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -53,7 +53,9 @@
       "Bash(gh pr diff:*)",
       "Bash(gh pr checks:*)",
       "Bash(gh run view:*)",
-      "Bash(gh pr checkout:*)"
+      "Bash(gh pr checkout:*)",
+      "mcp__acp__Bash",
+      "mcp__acp__Edit"
     ],
     "deny": [],
     "ask": []
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 19bc611a..106a1145 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- **IN Clause with Ecto.Query.Tagged Structs** - Fixed issue #63 where `~w()` sigil word lists in IN clauses returned zero results due to Tagged struct wrapping. Now properly extracts list values from `Ecto.Query.Tagged` structs before generating IN clauses, enabling these patterns to work correctly.
+
 ## [0.8.8] - 2026-01-23
 
 ### Fixed
diff --git a/lib/ecto/adapters/libsql/connection.ex b/lib/ecto/adapters/libsql/connection.ex
index e72af65b..1d296eec 100644
--- a/lib/ecto/adapters/libsql/connection.ex
+++ b/lib/ecto/adapters/libsql/connection.ex
@@ -1249,6 +1249,27 @@ defmodule Ecto.Adapters.LibSql.Connection do
     [expr(left, sources, query), " IN (", args, ?)]
   end
 
+  # Catch-all for IN with non-list right side (e.g. Ecto.Query.Tagged from ~w() sigil, JSON-encoded arrays)
+  # This handles cases where the right side has been pre-processed or wrapped by Ecto
+  defp expr({:in, _, [left, right]}, sources, query) do
+    case right do
+      %Ecto.Query.Tagged{value: val} when is_list(val) ->
+        # Extract list from Tagged struct and generate proper IN clause
+        args = Enum.map_intersperse(val, ?,, &expr(&1, sources, query))
+        [expr(left, sources, query), " IN (", args, ?)]
+
+      _ ->
+        # Default fallback: use JSON_EACH to handle JSON-encoded arrays or other complex types
+        [
+          expr(left, sources, query),
+          " IN (SELECT value FROM JSON_EACH(",
+          expr(right, sources, query),
+          ?),
+          ?)
+        ]
+    end
+  end
+
   # LIKE
   defp expr({:like, _, [left, right]}, sources, query) do
     [expr(left, sources, query), " LIKE ", expr(right, sources, query)]
diff --git a/test/issue_63_in_clause_test.exs b/test/issue_63_in_clause_test.exs
index 1298dbe5..5651f826 100644
--- a/test/issue_63_in_clause_test.exs
+++ b/test/issue_63_in_clause_test.exs
@@ -121,4 +121,32 @@ defmodule EctoLibSql.Issue63InClauseTest do
     # Empty IN clause should match nothing
     assert result == []
   end
+
+  test "IN clause with literal word list (~w) - e.g. oban" do
+    # test data matching Oban's state values
+    Ecto.Adapters.SQL.query!(TestRepo, """
+    INSERT INTO test_items (state, name, inserted_at, updated_at)
+    VALUES ('scheduled', 'job1', datetime('now'), datetime('now')),
+           ('retryable', 'job2', datetime('now'), datetime('now')),
+           ('available', 'job3', datetime('now'), datetime('now')),
+           ('completed', 'job4', datetime('now'), datetime('now'))
+    """)
+
+    # This is how Oban's Lite engine queries jobs - using ~w() sigil
+    # ~w() creates a compile-time list that Ecto wraps in %Ecto.Query.Tagged{}
+    # This was causing "datatype mismatch" because the Tagged struct wasn't
+    # being handled by the IN clause expression generator
+    query =
+      from(t in "test_items",
+        where: t.state in ~w(scheduled retryable),
+        select: t.name
+      )
+
+    # should not raise "datatype mismatch" error
+    result = TestRepo.all(query)
+
+    assert length(result) == 2
+    assert "job1" in result
+    assert "job2" in result
+  end
 end