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>

src/lembas/services/prompts.py

@@ -801,7 +801,8 @@ BUILTIN: tuple[Fragment, ...] = (
             "would be tedious to work out again: a procedure, a decision and its reasons, "
             "a summary of a long document. Correct one with notes_edit when it turns out "
             "to be wrong, and remove it with notes_delete when it is no longer true — a "
-            "stale note is worse than no note."
+            "stale note is worse than no note. Anything short and durable about the "
+            "person themselves is a memory rather than a note."
         ),
     ),
     Fragment(
@@ -813,32 +814,58 @@ BUILTIN: tuple[Fragment, ...] = (
         variables=("memory_limit",),
         hint="Appears when memory_add and memory_forget are offered. What is "
         "remembered costs tokens on every request forever, which is why the "
-        "wording is about restraint.",
+        "wording is about restraint — and why it says to read what is already "
+        "there first: the same fact stored twice in different words costs the "
+        "window twice and makes either one ambiguous to remove afterwards.",
         default=(
             "- You can remember durable facts about this person — a preference, a "
             "constraint, a name, how they like to be addressed. Use memory_add for those: "
-            "one fact each, under {{memory_limit}} characters. Do not remember the details "
-            "of a single task, anything that will be untrue next month, or anything "
-            "secret — keys, passwords, or health details they have not asked you to keep. "
+            "one fact each, under {{memory_limit}} characters. Everything remembered is "
+            "already in this message, so read it before adding: saying the same thing "
+            "again in different words costs the window twice and makes either one hard "
+            "to remove afterwards. Do not remember the details of a single task, anything "
+            "that will be untrue next month, or anything secret — keys, passwords, or "
+            "health details they have not asked you to keep. Anything longer than a "
+            "sentence, or about the work rather than about them, does not belong here. "
             "When something you remembered turns out to be wrong, remove it with "
-            "memory_forget rather than adding a correction beside it."
+            "memory_forget, quoting it in full, rather than adding a correction beside it."
         ),
     ),
     Fragment(
         key="tool.skills",
-        label="Skills",
+        label="Skills: reading one",
         group=GROUP_TOOLS,
         order=240,
         families=("skills",),
-        hint="Appears when the skill tools are offered.",
+        requires=("skills",),
+        hint="Only once there is at least one skill. This used to be one "
+        "fragment gated on the family alone, so a person with no skills got "
+        "'the list below gives each one's name' above no list, and skill_get "
+        "in the tools array — which is exactly why models hunt for skills that "
+        "do not exist. The writing half is its own fragment below, because "
+        "that half is most useful precisely when there are none.",
         default=(
             "- Skills are procedures you have saved. The list below gives only each one's "
             "name and when to use it; read the full instructions with skill_get before "
-            "following one. If you work out a repeatable way to do something, save it with "
-            "skill_create. If following one shows it to be wrong or incomplete, improve it "
+            "following one. If following one shows it to be wrong or incomplete, improve it "
             "with skill_edit and say why — the previous version is kept and can be restored."
         ),
     ),
+    Fragment(
+        key="tool.skills_write",
+        label="Skills: saving one",
+        group=GROUP_TOOLS,
+        order=241,
+        families=("skills",),
+        hint="The other half, and deliberately NOT gated on there being any: "
+        "somebody with no skills is exactly who most needs to be told they can "
+        "save the first one.",
+        default=(
+            "- If you work out a repeatable way to do something you expect to be asked for "
+            "again, save it with skill_create. The description has to say when to use it, "
+            "since that is all you will see next time."
+        ),
+    ),
     # --- Context -------------------------------------------------------------
     Fragment(
         key="context.knowledge_scope",
@@ -864,11 +891,15 @@ BUILTIN: tuple[Fragment, ...] = (
         variables=("memories",),
         requires=("memories",),
         hint="The remembered facts themselves, injected whole on every turn. "
-        "Skipped entirely when there are none.",
+        "Skipped entirely when there are none. It used to say these 'still "
+        "apply', which nothing checks — and which taught a model to trust a "
+        "stale memory over what the person had just said.",
         default=(
             "### What you know about this person\n"
             "\n"
-            "The following was remembered in earlier conversations and still applies.\n"
+            "These were remembered in earlier conversations. If something here is "
+            "contradicted by what they say now, believe them and remove it with "
+            "memory_forget.\n"
             "\n"
             "{{memories}}"
         ),