A menu for what a chat may use, and three keys

Six smaller things, all of them about the interface not saying what is true.

The @ button only ever inserted the character, which the @ key already does
without a button. It becomes the scope menu: what this chat may use, switched
off per chat. Chat.scope_json is filtered inside resolve_tools AFTER the
capability, permission and instance gates -- exactly as chat.knowledge_bases
narrows knowledge_search -- so a crafted POST turning something on reaches a
tool the gates already removed, and there is a test that writes the column
directly to prove it. Absent means on, for every key, so "why is this off?" has
one answer. It is keyed on the gate rather than the tool name, so notes is one
switch rather than five. The switches carry no role="menuitem", deliberately:
ui.js closes a picker when a menuitem is clicked, which is right for an action
menu and wrong for a list you want to set several of -- which is why the menu
needs no JavaScript at all. Typing @ is untouched.

With no skills, nothing should mention them. tool.skills was gated on the family
alone, so somebody with an empty library was told "the list below gives each
one's name" above no list, handed skill_get, and watched the model spend a round
finding out. It requires skills now; the writing half moved to
tool.skills_write, which is deliberately not gated, because saving the first one
is what somebody with none most needs. And core.tool_list finally reads
tool_names, which had been resolved and documented with no fragment using it.

The composer's toolbar is one row again. .composer__actions is last in the DOM
with margin-left:auto, so the moment an agent chat added a connection, a
directory and a mode, Send and the microphone dropped to a second line.
chat.css has no media queries by design and the fix is not to add one:
.composer__context is the single child allowed to shrink and scroll sideways.
There is a test asserting the file still contains no @media.

The effort picker shows the level in force. "Effort: default" named no level and
was true of nothing in particular; chat.resolved_effort is the chat's own value
and build_request reads the same field, so what is shown is what is sent. The
model's default is a seed, copied onto the row at creation and on a model
change, and never consulted at request time -- a fallback would resurrect it
underneath a cleared effort and make "off" silently do nothing. "off" is a
sentinel and not an empty value, because start_chat declares Form("") and cannot
tell absent from empty: with value="" the reader picks off and gets high.

Alt+M dictates, Alt+R reads the last reply aloud, Ctrl+Enter sends from
anywhere. All three click the button that already does the job, so audio.js
keeps its one delegated listener. Alt+M and not Alt+D, which is the address bar
in Chrome and Firefox. Ctrl+Enter never means Stop -- Send and Stop are the same
element, and Esc already stops. Driven under a DOM stub before committing, per
the rule in CLAUDE.md, and tests/test_commands_js.py pins that every key has a
row in SHORTCUTS, since /help reads that list.

And the memory tooling, which had seven defects. The worst: memory_forget was a
case-insensitive substring first-match delete with nothing warning about it, so
forgetting "coffee" against "Drinks coffee black" and "Allergic to coffee"
silently removed whichever was older -- a wrong deletion nobody would ever find
out about, from a tool whose description invited exactly the short fragment that
misfires. It matches exactly first, then by substring, and refuses an ambiguous
one while naming what it matched. add() refuses an exact duplicate. The
at-the-limit refusal no longer tells the model to delete one to make room: past
the block's budget it is not shown all of them and would be guessing, which
feeds straight back into the first defect. And context.memories no longer claims
the memories "still apply", which nothing checks and which taught a model to
trust a stale one over what the person had just said.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/test_chat.py

@@ -699,3 +699,79 @@ def test_the_sidebar_shows_an_unread_dot(client: TestClient, db, registered, mak
     page = client.get("/chat").text
     assert f'id="unread-{chat_id}" class="unread-dot"' in page
     assert 'hx-get="/api/chats/unread"' in page
+
+
+# --- The composer's one row --------------------------------------------------
+def test_the_send_button_is_the_last_thing_in_the_toolbar(client: TestClient, db, registered):
+    """What the layout depends on. `.composer__actions` is pushed right by
+    `margin-left: auto` and refuses to shrink, and both only work while it is
+    the last child -- when the row wrapped instead, it was the last child that
+    dropped to a second line, so an agent chat pushed Send and the microphone
+    off the row entirely."""
+    _add_connection(db)
+    html = client.get("/chat").text
+    toolbar = html.split('class="composer__toolbar"', 1)[1]
+
+    assert 'class="composer__actions"' in toolbar
+    assert toolbar.index("composer__actions") > toolbar.index("composer__tools")
+    assert "data-composer-action" in toolbar
+
+
+def test_the_agent_controls_shrink_rather_than_pushing_send_off_the_row(
+    client: TestClient, db, registered
+):
+    """They live in `.composer__context`, which is the only flex child allowed
+    to shrink and scroll. Anything moved out of it stops shrinking and starts
+    pushing Send onto a second line again -- which is what this whole row was
+    rearranged to stop."""
+    from lembas.db.models import SshProfile
+    from lembas.services import settings_store
+
+    _add_connection(db)
+    settings_store.update(db, {"enabled": True}, key=settings_store.AGENTS)
+    db.add(
+        SshProfile(
+            owner_id=_user_id(db),
+            name="Test box",
+            host="127.0.0.1",
+            port=22,
+            username="t",
+            host_key="k",
+            host_fingerprint="f",
+            default_dir="/work",
+        )
+    )
+    db.commit()
+
+    html = client.get("/chat").text
+    if "composer__context" not in html:
+        pytest.skip("agent chats are unavailable here")
+
+    # The three that appear when Agent is chosen sit between the start of
+    # `.composer__context` and the start of `.composer__actions` -- which is
+    # what puts them inside the one child that is allowed to give, and keeps
+    # the actions last.
+    opens = html.index('class="composer__context"')
+    actions = html.index('class="composer__actions"')
+    for control in ("ssh_profile_id", "data-dir-browse", 'name="agent_mode"'):
+        assert opens < html.index(control) < actions, control
+
+
+def test_the_chat_stylesheet_has_no_media_queries(client: TestClient):
+    """A stated design constraint, pinned so nobody 'fixes' a layout with a
+    breakpoint later. The composer fits at every width by saying which child
+    gives, not by rearranging itself at a threshold."""
+    from pathlib import Path
+
+    import lembas
+
+    css = Path(lembas.__file__).parent / "web/static/css/chat.css"
+    assert "@media" not in css.read_text()
+
+
+def _user_id(db):
+    from sqlalchemy import select
+
+    from lembas.db.models import User
+
+    return db.scalar(select(User.id))