diff --git a/tests/test_cli.py b/tests/test_cli.py
index 2eb0fd4..aa06654 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -88,3 +88,109 @@ def test_cli_bookmark_alias_works(monkeypatch) -> None:
 
     assert result.exit_code == 0
     assert calls == ["123"]
+
+
+def test_cli_whoami_command(monkeypatch) -> None:
+    from twitter_cli.models import UserProfile
+
+    class FakeClient:
+        def fetch_me(self) -> UserProfile:
+            return UserProfile(id="42", name="Test User", screen_name="testuser")
+
+    monkeypatch.setattr("twitter_cli.cli._get_client", lambda config=None: FakeClient())
+    runner = CliRunner()
+
+    result = runner.invoke(cli, ["whoami"])
+    assert result.exit_code == 0
+
+    result_json = runner.invoke(cli, ["whoami", "--json"])
+    assert result_json.exit_code == 0
+    assert '"screenName": "testuser"' in result_json.output
+
+
+def test_cli_reply_command(monkeypatch) -> None:
+    calls = []
+
+    class FakeClient:
+        def create_tweet(self, text: str, reply_to_id=None) -> str:
+            calls.append({"text": text, "reply_to_id": reply_to_id})
+            return "999"
+
+    monkeypatch.setattr("twitter_cli.cli._get_client", lambda config=None: FakeClient())
+    runner = CliRunner()
+
+    result = runner.invoke(cli, ["reply", "12345", "Nice tweet!"])
+    assert result.exit_code == 0
+    assert calls[0]["reply_to_id"] == "12345"
+    assert calls[0]["text"] == "Nice tweet!"
+
+
+def test_cli_quote_command(monkeypatch) -> None:
+    calls = []
+
+    class FakeClient:
+        def quote_tweet(self, tweet_id: str, text: str) -> str:
+            calls.append({"tweet_id": tweet_id, "text": text})
+            return "888"
+
+    monkeypatch.setattr("twitter_cli.cli._get_client", lambda config=None: FakeClient())
+    runner = CliRunner()
+
+    result = runner.invoke(cli, ["quote", "12345", "Interesting!"])
+    assert result.exit_code == 0
+    assert calls[0]["tweet_id"] == "12345"
+    assert calls[0]["text"] == "Interesting!"
+
+
+def test_cli_follow_command(monkeypatch) -> None:
+    from twitter_cli.models import UserProfile
+    actions = []
+
+    class FakeClient:
+        def fetch_user(self, screen_name: str) -> UserProfile:
+            return UserProfile(id="42", name="Alice", screen_name=screen_name)
+
+        def follow_user(self, user_id: str) -> bool:
+            actions.append(("follow", user_id))
+            return True
+
+    monkeypatch.setattr("twitter_cli.cli._get_client", lambda config=None: FakeClient())
+    runner = CliRunner()
+
+    result = runner.invoke(cli, ["follow", "alice"])
+    assert result.exit_code == 0
+    assert actions == [("follow", "42")]
+
+
+def test_cli_unfollow_command(monkeypatch) -> None:
+    from twitter_cli.models import UserProfile
+    actions = []
+
+    class FakeClient:
+        def fetch_user(self, screen_name: str) -> UserProfile:
+            return UserProfile(id="42", name="Alice", screen_name=screen_name)
+
+        def unfollow_user(self, user_id: str) -> bool:
+            actions.append(("unfollow", user_id))
+            return True
+
+    monkeypatch.setattr("twitter_cli.cli._get_client", lambda config=None: FakeClient())
+    runner = CliRunner()
+
+    result = runner.invoke(cli, ["unfollow", "alice"])
+    assert result.exit_code == 0
+    assert actions == [("unfollow", "42")]
+
+
+def test_cli_compact_mode(tmp_path, tweet_factory) -> None:
+    json_path = tmp_path / "tweets.json"
+    json_path.write_text(tweets_to_json([tweet_factory("1")]), encoding="utf-8")
+
+    runner = CliRunner()
+    result = runner.invoke(cli, ["-c", "feed", "--input", str(json_path)])
+    assert result.exit_code == 0
+    # Compact output should have "author" field with @ prefix
+    assert '"@alice"' in result.output
+    # Compact output should NOT have full metrics keys
+    assert '"metrics"' not in result.output
+
diff --git a/tests/test_serialization.py b/tests/test_serialization.py
index 0df50e7..bb44fa6 100644
--- a/tests/test_serialization.py
+++ b/tests/test_serialization.py
@@ -20,3 +20,32 @@ def test_tweets_json_roundtrip(tweet_factory) -> None:
 
     assert [tweet.id for tweet in restored] == ["1", "2"]
     assert restored[1].lang == "zh"
+
+
+def test_compact_serialization(tweet_factory) -> None:
+    from twitter_cli.serialization import tweet_to_compact_dict, tweets_to_compact_json
+    import json
+
+    tweet = tweet_factory(
+        "42",
+        created_at="Sat Mar 07 05:51:02 +0000 2026",
+        text="A" * 200,
+    )
+    compact = tweet_to_compact_dict(tweet)
+
+    assert compact["id"] == "42"
+    assert compact["author"] == "@alice"
+    assert compact["time"] == "Mar 07 05:51"
+    assert len(compact["text"]) <= 140
+    assert compact["text"].endswith("...")
+    assert compact["likes"] == 10
+    assert compact["rts"] == 2
+    # Should only have 6 keys
+    assert set(compact.keys()) == {"id", "author", "text", "likes", "rts", "time"}
+
+    # Test batch serialization
+    raw = tweets_to_compact_json([tweet])
+    parsed = json.loads(raw)
+    assert len(parsed) == 1
+    assert parsed[0]["author"] == "@alice"
+
diff --git a/twitter_cli/cli.py b/twitter_cli/cli.py
index 8412553..4757cbf 100644
--- a/twitter_cli/cli.py
+++ b/twitter_cli/cli.py
@@ -12,13 +12,17 @@ Read commands:
     twitter list <id>                 # list timeline
     twitter followers <handle>        # followers list
     twitter following <handle>        # following list
+    twitter whoami                    # current user profile
 
 Write commands:
     twitter post "text"               # post a tweet
+    twitter reply <id> "text"         # reply to a tweet
+    twitter quote <id> "text"         # quote-tweet
     twitter delete <id>               # delete a tweet
     twitter like/unlike <id>          # like/unlike
     twitter bookmark/unbookmark <id>  # bookmark/unbookmark
     twitter retweet/unretweet <id>    # retweet/unretweet
+    twitter follow/unfollow <handle>  # follow/unfollow
 """
 
 from __future__ import annotations
@@ -46,7 +50,13 @@ from .formatter import (
     print_user_profile,
     print_user_table,
 )
-from .serialization import tweets_from_json, tweets_to_json, user_profile_to_dict, users_to_json
+from .serialization import (
+    tweets_from_json,
+    tweets_to_compact_json,
+    tweets_to_json,
+    user_profile_to_dict,
+    users_to_json,
+)
 
 
 console = Console(stderr=True)
@@ -160,15 +170,19 @@ def _apply_filter(tweets, do_filter, config):
 
 @click.group()
 @click.option("--verbose", "-v", is_flag=True, help="Enable debug logging.")
+@click.option("--compact", "-c", is_flag=True, help="Compact output (minimal fields, LLM-friendly).")
 @click.version_option(version=__version__)
-def cli(verbose):
-    # type: (bool) -> None
+@click.pass_context
+def cli(ctx, verbose, compact):
+    # type: (Any, bool, bool) -> None
     """twitter — Twitter/X CLI tool 🐦"""
     _setup_logging(verbose)
+    ctx.ensure_object(dict)
+    ctx.obj["compact"] = compact
 
 
-def _fetch_and_display(fetch_fn, label, emoji, max_count, as_json, output_file, do_filter, config=None):
-    # type: (Any, str, str, Optional[int], bool, Optional[str], bool, Optional[dict]) -> None
+def _fetch_and_display(fetch_fn, label, emoji, max_count, as_json, output_file, do_filter, config=None, compact=False):
+    # type: (Any, str, str, Optional[int], bool, Optional[str], bool, Optional[dict], bool) -> None
     """Common fetch-filter-display logic for timeline-like commands."""
     if config is None:
         config = load_config()
@@ -188,6 +202,10 @@ def _fetch_and_display(fetch_fn, label, emoji, max_count, as_json, output_file,
         Path(output_file).write_text(tweets_to_json(filtered), encoding="utf-8")
         console.print("💾 Saved to %s\n" % output_file)
 
+    if compact:
+        click.echo(tweets_to_compact_json(filtered))
+        return
+
     if as_json:
         click.echo(tweets_to_json(filtered))
         return
@@ -196,8 +214,8 @@ def _fetch_and_display(fetch_fn, label, emoji, max_count, as_json, output_file,
     console.print()
 
 
-def _run_bookmarks_command(max_count, as_json, output_file, do_filter):
-    # type: (Optional[int], bool, Optional[str], bool) -> None
+def _run_bookmarks_command(max_count, as_json, output_file, do_filter, compact=False):
+    # type: (Optional[int], bool, Optional[str], bool, bool) -> None
     config = load_config()
 
     def _run():
@@ -211,6 +229,7 @@ def _run_bookmarks_command(max_count, as_json, output_file, do_filter):
             output_file,
             do_filter,
             config,
+            compact=compact,
         )
 
     _run_guarded(_run)
@@ -230,9 +249,11 @@ def _run_bookmarks_command(max_count, as_json, output_file, do_filter):
 @click.option("--input", "-i", "input_file", type=str, default=None, help="Load tweets from JSON file.")
 @click.option("--output", "-o", "output_file", type=str, default=None, help="Save filtered tweets to JSON file.")
 @click.option("--filter", "do_filter", is_flag=True, help="Enable score-based filtering.")
-def feed(feed_type, max_count, as_json, input_file, output_file, do_filter):
-    # type: (str, Optional[int], bool, Optional[str], Optional[str], bool) -> None
+@click.pass_context
+def feed(ctx, feed_type, max_count, as_json, input_file, output_file, do_filter):
+    # type: (Any, str, Optional[int], bool, Optional[str], Optional[str], bool) -> None
     """Fetch home timeline with optional filtering."""
+    compact = ctx.obj.get("compact", False)
     config = load_config()
     try:
         if input_file:
@@ -260,6 +281,10 @@ def feed(feed_type, max_count, as_json, input_file, output_file, do_filter):
         Path(output_file).write_text(tweets_to_json(filtered), encoding="utf-8")
         console.print("💾 Saved filtered tweets to %s\n" % output_file)
 
+    if compact:
+        click.echo(tweets_to_compact_json(filtered))
+        return
+
     if as_json:
         click.echo(tweets_to_json(filtered))
         return
@@ -275,10 +300,11 @@ def feed(feed_type, max_count, as_json, input_file, output_file, do_filter):
 @click.option("--json", "as_json", is_flag=True, help="Output as JSON.")
 @click.option("--output", "-o", "output_file", type=str, default=None, help="Save tweets to JSON file.")
 @click.option("--filter", "do_filter", is_flag=True, help="Enable score-based filtering.")
-def favorites(max_count, as_json, output_file, do_filter):
-    # type: (Optional[int], bool, Optional[str], bool) -> None
+@click.pass_context
+def favorites(ctx, max_count, as_json, output_file, do_filter):
+    # type: (Any, Optional[int], bool, Optional[str], bool) -> None
     """Fetch bookmarked (favorite) tweets."""
-    _run_bookmarks_command(max_count, as_json, output_file, do_filter)
+    _run_bookmarks_command(max_count, as_json, output_file, do_filter, compact=ctx.obj.get("compact", False))
 
 
 @cli.command(name="bookmarks")
@@ -286,10 +312,11 @@ def favorites(max_count, as_json, output_file, do_filter):
 @click.option("--json", "as_json", is_flag=True, help="Output as JSON.")
 @click.option("--output", "-o", "output_file", type=str, default=None, help="Save tweets to JSON file.")
 @click.option("--filter", "do_filter", is_flag=True, help="Enable score-based filtering.")
-def bookmarks(max_count, as_json, output_file, do_filter):
-    # type: (Optional[int], bool, Optional[str], bool) -> None
+@click.pass_context
+def bookmarks(ctx, max_count, as_json, output_file, do_filter):
+    # type: (Any, Optional[int], bool, Optional[str], bool) -> None
     """Fetch bookmarked tweets."""
-    _run_bookmarks_command(max_count, as_json, output_file, do_filter)
+    _run_bookmarks_command(max_count, as_json, output_file, do_filter, compact=ctx.obj.get("compact", False))
 
 
 @cli.command()
@@ -319,10 +346,12 @@ def user(screen_name, as_json):
 @click.option("--max", "-n", "max_count", type=int, default=None, help="Max number of tweets to fetch.")
 @click.option("--json", "as_json", is_flag=True, help="Output as JSON.")
 @click.option("--output", "-o", "output_file", type=str, default=None, help="Save tweets to JSON file.")
-def user_posts(screen_name, max_count, as_json, output_file):
-    # type: (str, int, bool, Optional[str]) -> None
+@click.pass_context
+def user_posts(ctx, screen_name, max_count, as_json, output_file):
+    # type: (Any, str, int, bool, Optional[str]) -> None
     """List a user's tweets. SCREEN_NAME is the @handle (without @)."""
     screen_name = screen_name.lstrip("@")
+    compact = ctx.obj.get("compact", False)
     config = load_config()
     def _run():
         client = _get_client(config)
@@ -331,6 +360,7 @@ def user_posts(screen_name, max_count, as_json, output_file):
         _fetch_and_display(
             lambda count: client.fetch_user_tweets(profile.id, count),
             "@%s tweets" % screen_name, "📝", max_count, as_json, output_file, False, config,
+            compact=compact,
         )
     _run_guarded(_run)
 
@@ -349,15 +379,18 @@ def user_posts(screen_name, max_count, as_json, output_file):
 @click.option("--json", "as_json", is_flag=True, help="Output as JSON.")
 @click.option("--output", "-o", "output_file", type=str, default=None, help="Save tweets to JSON file.")
 @click.option("--filter", "do_filter", is_flag=True, help="Enable score-based filtering.")
-def search(query, product, max_count, as_json, output_file, do_filter):
-    # type: (str, str, int, bool, Optional[str], bool) -> None
+@click.pass_context
+def search(ctx, query, product, max_count, as_json, output_file, do_filter):
+    # type: (Any, str, str, int, bool, Optional[str], bool) -> None
     """Search tweets by QUERY string."""
+    compact = ctx.obj.get("compact", False)
     config = load_config()
     def _run():
         client = _get_client(config)
         _fetch_and_display(
             lambda count: client.fetch_search(query, count, product),
             "'%s' (%s)" % (query, product), "🔍", max_count, as_json, output_file, do_filter, config,
+            compact=compact,
         )
     _run_guarded(_run)
 
@@ -368,10 +401,12 @@ def search(query, product, max_count, as_json, output_file, do_filter):
 @click.option("--json", "as_json", is_flag=True, help="Output as JSON.")
 @click.option("--output", "-o", "output_file", type=str, default=None, help="Save tweets to JSON file.")
 @click.option("--filter", "do_filter", is_flag=True, help="Enable score-based filtering.")
-def likes(screen_name, max_count, as_json, output_file, do_filter):
-    # type: (str, int, bool, Optional[str], bool) -> None
+@click.pass_context
+def likes(ctx, screen_name, max_count, as_json, output_file, do_filter):
+    # type: (Any, str, int, bool, Optional[str], bool) -> None
     """Show tweets liked by a user. SCREEN_NAME is the @handle (without @)."""
     screen_name = screen_name.lstrip("@")
+    compact = ctx.obj.get("compact", False)
     config = load_config()
     def _run():
         client = _get_client(config)
@@ -380,6 +415,7 @@ def likes(screen_name, max_count, as_json, output_file, do_filter):
         _fetch_and_display(
             lambda count: client.fetch_user_likes(profile.id, count),
             "@%s likes" % screen_name, "❤️", max_count, as_json, output_file, do_filter, config,
+            compact=compact,
         )
     _run_guarded(_run)
 
@@ -388,9 +424,11 @@ def likes(screen_name, max_count, as_json, output_file, do_filter):
 @click.argument("tweet_id")
 @click.option("--max", "-n", "max_count", type=int, default=None, help="Max replies to fetch.")
 @click.option("--json", "as_json", is_flag=True, help="Output as JSON.")
-def tweet(tweet_id, max_count, as_json):
-    # type: (str, int, bool) -> None
+@click.pass_context
+def tweet(ctx, tweet_id, max_count, as_json):
+    # type: (Any, str, int, bool) -> None
     """View a tweet and its replies. TWEET_ID is the numeric tweet ID or full URL."""
+    compact = ctx.obj.get("compact", False)
     tweet_id = _normalize_tweet_id(tweet_id)
     config = load_config()
     try:
@@ -403,6 +441,10 @@ def tweet(tweet_id, max_count, as_json):
     except RuntimeError as exc:
         _exit_with_error(exc)
 
+    if compact:
+        click.echo(tweets_to_compact_json(tweets))
+        return
+
     if as_json:
         click.echo(tweets_to_json(tweets))
         return
@@ -420,15 +462,18 @@ def tweet(tweet_id, max_count, as_json):
 @click.option("--max", "-n", "max_count", type=int, default=None, help="Max tweets to fetch.")
 @click.option("--json", "as_json", is_flag=True, help="Output as JSON.")
 @click.option("--filter", "do_filter", is_flag=True, help="Enable score-based filtering.")
-def list_timeline(list_id, max_count, as_json, do_filter):
-    # type: (str, int, bool, bool) -> None
+@click.pass_context
+def list_timeline(ctx, list_id, max_count, as_json, do_filter):
+    # type: (Any, str, int, bool, bool) -> None
     """Fetch tweets from a Twitter List. LIST_ID is the numeric list ID."""
+    compact = ctx.obj.get("compact", False)
     config = load_config()
     def _run():
         client = _get_client(config)
         _fetch_and_display(
             lambda count: client.fetch_list_timeline(list_id, count),
             "list %s" % list_id, "📋", max_count, as_json, None, do_filter, config,
+            compact=compact,
         )
     _run_guarded(_run)
 
@@ -526,6 +571,98 @@ def post(text, reply_to):
         _exit_with_error(exc)
 
 
+@cli.command(name="reply")
+@click.argument("tweet_id")
+@click.argument("text")
+def reply_tweet(tweet_id, text):
+    # type: (str, str) -> None
+    """Reply to a tweet. TWEET_ID is the tweet to reply to, TEXT is the reply content."""
+    tweet_id = _normalize_tweet_id(tweet_id)
+    config = load_config()
+    try:
+        client = _get_client(config)
+        console.print("💬 Replying to %s..." % tweet_id)
+        new_id = client.create_tweet(text, reply_to_id=tweet_id)
+        console.print("[green]✅ Reply posted![/green]")
+        console.print("🔗 https://x.com/i/status/%s" % new_id)
+    except RuntimeError as exc:
+        _exit_with_error(exc)
+
+
+@cli.command(name="quote")
+@click.argument("tweet_id")
+@click.argument("text")
+def quote_tweet(tweet_id, text):
+    # type: (str, str) -> None
+    """Quote-tweet a tweet. TWEET_ID is the tweet to quote, TEXT is the commentary."""
+    tweet_id = _normalize_tweet_id(tweet_id)
+    config = load_config()
+    try:
+        client = _get_client(config)
+        console.print("🔄 Quoting tweet %s..." % tweet_id)
+        new_id = client.quote_tweet(tweet_id, text)
+        console.print("[green]✅ Quote tweet posted![/green]")
+        console.print("🔗 https://x.com/i/status/%s" % new_id)
+    except RuntimeError as exc:
+        _exit_with_error(exc)
+
+
+@cli.command(name="whoami")
+@click.option("--json", "as_json", is_flag=True, help="Output as JSON.")
+def whoami(as_json):
+    # type: (bool,) -> None
+    """Show the currently authenticated user's profile."""
+    config = load_config()
+    try:
+        client = _get_client(config)
+        console.print("👤 Fetching current user...")
+        profile = client.fetch_me()
+    except RuntimeError as exc:
+        _exit_with_error(exc)
+
+    if as_json:
+        click.echo(json.dumps(user_profile_to_dict(profile), ensure_ascii=False, indent=2))
+    else:
+        console.print()
+        print_user_profile(profile, console)
+
+
+@cli.command(name="follow")
+@click.argument("screen_name")
+def follow_user(screen_name):
+    # type: (str,) -> None
+    """Follow a user. SCREEN_NAME is the @handle (without @)."""
+    screen_name = screen_name.lstrip("@")
+    config = load_config()
+    try:
+        client = _get_client(config)
+        console.print("👤 Looking up @%s..." % screen_name)
+        profile = client.fetch_user(screen_name)
+        console.print("➕ Following @%s..." % screen_name)
+        client.follow_user(profile.id)
+        console.print("[green]✅ Now following @%s[/green]" % screen_name)
+    except RuntimeError as exc:
+        _exit_with_error(exc)
+
+
+@cli.command(name="unfollow")
+@click.argument("screen_name")
+def unfollow_user(screen_name):
+    # type: (str,) -> None
+    """Unfollow a user. SCREEN_NAME is the @handle (without @)."""
+    screen_name = screen_name.lstrip("@")
+    config = load_config()
+    try:
+        client = _get_client(config)
+        console.print("👤 Looking up @%s..." % screen_name)
+        profile = client.fetch_user(screen_name)
+        console.print("➖ Unfollowing @%s..." % screen_name)
+        client.unfollow_user(profile.id)
+        console.print("[green]✅ Unfollowed @%s[/green]" % screen_name)
+    except RuntimeError as exc:
+        _exit_with_error(exc)
+
+
 @cli.command(name="delete")
 @click.argument("tweet_id")
 @click.confirmation_option(prompt="Are you sure you want to delete this tweet?")
diff --git a/twitter_cli/client.py b/twitter_cli/client.py
index 16aa195..9c4d7c6 100644
--- a/twitter_cli/client.py
+++ b/twitter_cli/client.py
@@ -575,6 +575,76 @@ class TwitterClient:
         self._write_delay()
         return True
 
+    def fetch_me(self):
+        # type: () -> UserProfile
+        """Fetch the currently authenticated user's profile."""
+        url = "https://x.com/i/api/1.1/account/multi/list.json"
+        data = self._api_get(url)
+        if isinstance(data, list) and data:
+            user_data = data[0].get("user", {})
+            if user_data:
+                return UserProfile(
+                    id=str(user_data.get("id_str", "")),
+                    name=user_data.get("name", ""),
+                    screen_name=user_data.get("screen_name", ""),
+                    bio=user_data.get("description", ""),
+                    location=user_data.get("location", ""),
+                    url=_deep_get(user_data, "entities", "url", "urls", 0, "expanded_url") or "",
+                    followers_count=_parse_int(user_data.get("followers_count"), 0),
+                    following_count=_parse_int(user_data.get("friends_count"), 0),
+                    tweets_count=_parse_int(user_data.get("statuses_count"), 0),
+                    likes_count=_parse_int(user_data.get("favourites_count"), 0),
+                    verified=bool(user_data.get("verified", False)),
+                    profile_image_url=user_data.get("profile_image_url_https", ""),
+                    created_at=user_data.get("created_at", ""),
+                )
+        raise RuntimeError("Failed to fetch current user info")
+
+    def quote_tweet(self, tweet_id, text):
+        # type: (str, str) -> str
+        """Quote-tweet a tweet.  Returns the new tweet ID."""
+        variables = {
+            "tweet_text": text,
+            "attachment_url": "https://x.com/i/status/%s" % tweet_id,
+            "media": {"media_entities": [], "possibly_sensitive": False},
+            "semantic_annotation_ids": [],
+            "dark_request": False,
+        }
+        data = self._graphql_post("CreateTweet", variables, FEATURES)
+        self._write_delay()
+        result = _deep_get(data, "data", "create_tweet", "tweet_results", "result")
+        if result:
+            return result.get("rest_id", "")
+        raise RuntimeError("Failed to create quote tweet")
+
+    def follow_user(self, user_id):
+        # type: (str) -> bool
+        """Follow a user by user ID.  Returns True on success."""
+        url = "https://x.com/i/api/1.1/friendships/create.json"
+        body = {"user_id": user_id}
+        headers = self._build_headers(url=url, method="POST")
+        headers["Content-Type"] = "application/x-www-form-urlencoded"
+        session = _get_cffi_session()
+        response = session.post(url, headers=headers, data=body, timeout=30)
+        if response.status_code >= 400:
+            raise RuntimeError("Failed to follow user: HTTP %d" % response.status_code)
+        self._write_delay()
+        return True
+
+    def unfollow_user(self, user_id):
+        # type: (str) -> bool
+        """Unfollow a user by user ID.  Returns True on success."""
+        url = "https://x.com/i/api/1.1/friendships/destroy.json"
+        body = {"user_id": user_id}
+        headers = self._build_headers(url=url, method="POST")
+        headers["Content-Type"] = "application/x-www-form-urlencoded"
+        session = _get_cffi_session()
+        response = session.post(url, headers=headers, data=body, timeout=30)
+        if response.status_code >= 400:
+            raise RuntimeError("Failed to unfollow user: HTTP %d" % response.status_code)
+        self._write_delay()
+        return True
+
     def _fetch_timeline(self, operation_name, count, get_instructions, extra_variables=None, override_base_variables=False, field_toggles=None):
         # type: (str, int, Callable[[Any], Any], Optional[Dict[str, Any]], bool, Optional[Dict[str, Any]]) -> List[Tweet]
         """Generic timeline fetcher with pagination and deduplication.
diff --git a/twitter_cli/serialization.py b/twitter_cli/serialization.py
index ece85cd..429a668 100644
--- a/twitter_cli/serialization.py
+++ b/twitter_cli/serialization.py
@@ -129,6 +129,36 @@ def tweets_to_json(tweets: Iterable[Tweet]) -> str:
     return json.dumps([tweet_to_dict(tweet) for tweet in tweets], ensure_ascii=False, indent=2)
 
 
+def tweet_to_compact_dict(tweet: Tweet) -> Dict[str, Any]:
+    """Convert a Tweet into a compact dict with minimal fields for LLM consumption."""
+    text = tweet.text.replace("\n", " ").strip()
+    if len(text) > 140:
+        text = text[:137] + "..."
+    # Short time: "Mar 07 05:51" from "Sat Mar 07 05:51:02 +0000 2026"
+    parts = tweet.created_at.split()
+    if len(parts) >= 4:
+        time_str = "%s %s %s" % (parts[1], parts[2], parts[3][:5])
+    else:
+        time_str = tweet.created_at
+    return {
+        "id": tweet.id,
+        "author": "@%s" % tweet.author.screen_name,
+        "text": text,
+        "likes": tweet.metrics.likes,
+        "rts": tweet.metrics.retweets,
+        "time": time_str,
+    }
+
+
+def tweets_to_compact_json(tweets: Iterable[Tweet]) -> str:
+    """Serialize Tweet objects to compact JSON (minimal fields for LLM/pipe usage)."""
+    return json.dumps(
+        [tweet_to_compact_dict(tweet) for tweet in tweets],
+        ensure_ascii=False,
+        indent=2,
+    )
+
+
 def user_profile_to_dict(user: UserProfile) -> Dict[str, Any]:
     """Convert a UserProfile dataclass into a JSON-safe dict."""
     return {