fix(muse): Muse Code 1.4.8's argument hint, skill suggestions and skill rows in the slash palette

web/src/fixtures/panes/README.md

@@ -1858,6 +1858,11 @@ signature.
 | `muse--approval-ls-147.txt` | Muse Code 1.4.7 `ls` approval, `⟩` on option 1 (#424) | `blocked` |
 | `muse--approval-date-147.txt` | Muse Code 1.4.7 `date` approval, `⟩` on option 2 (#424) | `blocked` |
 | `muse--trust-prompt-147.txt` | Muse Code 1.4.7 workspace trust prompt (#424) | `blocked` |
+| `muse--palette-hint.txt` | Muse Code 1.4.8, `/model` typed: the box reads `❯ /model [<model-id>]`, the hint in the bottom rule's colour, over one `/model` suggestion. The read is `/model` | `idle` |
+| `muse--palette-hint-skills.txt` | `/resume` typed: its hint, and three suggestions, the bold `/resume` first and two built-in `resume-*` skills under it. The read is `/resume`, since Enter runs the bold row | `idle` |
+| `muse--palette-hint-moved.txt` | Same, after Down: the bold has moved to `/resume-claude`, so the read must not verify `/resume` | `idle` |
+| `muse--palette-typed-arg.txt` | `/model x` typed: the hint is gone and `x` wears the typed-text colour. The read is `/model x` | `idle` |
+| `muse--palette-skill.txt` | `/plan` typed: its one suggestion is a built-in skill row, `  /plan · built-in · default skill  On an explicit…`, tags between the command and the gap. The read is `/plan`. Visible-screen read 2026-10-15, cwd swapped for the sandbox path and model label renamed `mini` | `idle` |
 
 **Nothing was approved blindly.** The one approved command was `ls -la` on the
 empty sandbox (output verified); the trust prompt covered a throwaway `/tmp`
@@ -1866,6 +1871,11 @@ left open at the end were dismissed with `Escape`. A second session
 (2026-09-26, tasks popup, same throwaway sandbox) approved `sleep 120/100/110/150`
 (backgrounded, no output) and `ls -la /tmp` (listing verified).
 
+The four `muse--palette-*` rows of 2026-10-15 are visible-screen captures of Muse Code 1.4.8 in a
+throwaway Herdr session (`herdr pane read --source visible --format ansi`). The statusline's
+shortened cwd was swapped for `/private/tmp/collie-muse-sandbox`, the same 32 characters, and its
+model label renamed `mini`. Nothing was submitted while capturing.
+
 
 ## opencode corpus (captured 2026-09-26, opencode 1.18.32, herdr 0.9.0, private Herdr session)
 

web/src/fixtures/panes/muse--palette-hint-moved.txt

@@ -0,0 +1,10 @@
+
+  Muse Code 1.4.8
+
+── Voice input (⌥ + v to start) ───────────────────────────────────────────────────────────────────────────────────────
+❯ /resume [--last|<id-or-name>]                           
+  /resume                                    Resume an earlier Muse Code session                                       
+  /resume-claude · built-in · default skill  Continue a Claude Code session here                                       
+  /resume-codex · built-in · default skill   Continue a Codex session here
+───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+  mini · high · /private/tmp/collie-muse-sandbox · Auto-review

web/src/fixtures/panes/muse--palette-hint-skills.txt

@@ -0,0 +1,10 @@
+
+  Muse Code 1.4.8
+
+── Voice input (⌥ + v to start) ───────────────────────────────────────────────────────────────────────────────────────
+❯ /resume [--last|<id-or-name>]                           
+  /resume                                    Resume an earlier Muse Code session                                       
+  /resume-claude · built-in · default skill  Continue a Claude Code session here                                       
+  /resume-codex · built-in · default skill   Continue a Codex session here
+───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+  mini · high · /private/tmp/collie-muse-sandbox · Auto-review

web/src/fixtures/panes/muse--palette-hint.txt

@@ -0,0 +1,8 @@
+
+  Muse Code 1.4.8
+
+── Voice input (⌥ + v to start) ───────────────────────────────────────────────────────────────────────────────────────
+❯ /model [<model-id>]                                     
+  /model  Choose model                                                                                                 
+───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+  mini · high · /private/tmp/collie-muse-sandbox · Auto-review

web/src/fixtures/panes/muse--palette-skill.txt

@@ -0,0 +1,8 @@
+
+  Muse Code 1.4.8
+
+── Voice input (⌥ + v to start) ───────────────────────────────────────────────────────────────────────────────────────
+❯ /plan                                  
+  /plan · built-in · default skill  On an explicit planning request, always call `read_skill` for this skill before an…
+───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+  mini · high · /private/tmp/collie-muse-sandbox · Auto-review

web/src/fixtures/panes/muse--palette-typed-arg.txt

@@ -0,0 +1,7 @@
+
+  Muse Code 1.4.8
+
+── Voice input (⌥ + v to start) ───────────────────────────────────────────────────────────────────────────────────────
+❯ /model x                                                
+───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+  mini · high · /private/tmp/collie-muse-sandbox · Auto-review                                                         

web/src/lib/harness/muse.test.ts

@@ -61,7 +61,12 @@ const PINNED = [
   "muse--draft-wrapped.txt",
   "muse--fresh-idle.txt",
   "muse--palette-exact.txt",
+  "muse--palette-hint-moved.txt",
+  "muse--palette-hint-skills.txt",
+  "muse--palette-hint.txt",
   "muse--palette-partial.txt",
+  "muse--palette-skill.txt",
+  "muse--palette-typed-arg.txt",
   "muse--quoted-dialogs-bare.txt",
   "muse--tasks-popup-approval.txt",
   "muse--tasks-popup-draft.txt",

web/src/lib/harness/muse/chrome.test.ts

@@ -55,6 +55,30 @@ describe("extractInputDraft — the verify half of type-then-verify", () => {
     );
   });
 
+  it("drops Muse 1.4.8's argument hint, painted in the rule's colour, after an exact command", () => {
+    // `❯ /model [<model-id>]` over one `/model` suggestion: the hint is not typed text.
+    expect(extractInputDraft(lines("muse--palette-hint.txt"))).toBe("/model");
+  });
+
+  it("reads the command alone when the highlighted first suggestion of several names it", () => {
+    // `/resume` lists two built-in skills under it; the bold first row is the one Enter runs.
+    expect(extractInputDraft(lines("muse--palette-hint-skills.txt"))).toBe("/resume");
+  });
+
+  it("stalls safe once the highlight has moved off the typed command", () => {
+    // After Down, Enter would run `/resume-claude`, so the typed text must not verify.
+    expect(extractInputDraft(lines("muse--palette-hint-moved.txt"))).not.toBe("/resume");
+  });
+
+  it("reads a command whose one suggestion is a built-in skill row, tags and all", () => {
+    // `  /plan · built-in · default skill  On an explicit planning request…` (Muse 1.4.8).
+    expect(extractInputDraft(lines("muse--palette-skill.txt"))).toBe("/plan");
+  });
+
+  it("keeps a typed argument, which arrives in the typed-text colour once the hint is gone", () => {
+    expect(extractInputDraft(lines("muse--palette-typed-arg.txt"))).toBe("/model x");
+  });
+
   it("reads attach tokens verbatim (the attach grammar verifies them, not this) (#278)", () => {
     expect(extractInputDraft(lines("muse--draft-image-chip.txt"))).toBe("[Image #1]");
     expect(extractInputDraft(lines("muse--draft-quoted-path.txt"))).toBe(

web/src/lib/harness/muse/chrome.ts

@@ -144,14 +144,20 @@ export function extractInputDraft(lines: StyledLine[]): string | null {
   // keeps the legacy read and stalls safe: Enter on partial input accepts the highlighted
   // suggestion (probed: `/us` ran `/usage`), so verifying the typed text there would bless a
   // command the operator did not type.
+  //
+  // Muse 1.4.8 adds two things (live, 2026-10-15): an argument hint after a complete command
+  // (`❯ /model [<model-id>]`), and skills listed under a command they prefix (`/resume` over
+  // `/resume-claude` and `/resume-codex`). Several rows qualify only when the first one is the
+  // highlighted one, bold, since Enter runs the highlighted row (probed: Down moved the bold to
+  // `/resume-claude`).
   const trimmed = prompt.trim();
   if (trimmed.startsWith("/")) {
-    const run: string[] = [];
-    for (let i = tail.prompt + 1; i < tail.rule; i++) run.push(texts[i]!);
-    if (run.length === 1) {
-      const suggestion = parsePaletteRow(run[0]!);
-      if (suggestion !== null && suggestion.command === trimmed) return trimmed;
-    }
+    const typed = withoutArgumentHint(lines[tail.prompt]!, lines[tail.rule]!, trimmed);
+    const run: number[] = [];
+    for (let i = tail.prompt + 1; i < tail.rule; i++) run.push(i);
+    const head = run.length === 0 ? null : parsePaletteRow(texts[run[0]!]!);
+    const several = run.length > 1 && run.every((i) => texts[i]!.startsWith("  /")) && rowIsHighlighted(lines[run[0]!]!, typed);
+    if (head !== null && head.command === typed && (run.length === 1 || several)) return typed;
   }
   const parts = [prompt.trim()];
   for (let i = tail.prompt + 1; i < tail.rule; i++) {
@@ -166,6 +172,26 @@ export function extractInputDraft(lines: StyledLine[]): string | null {
   return draft;
 }
 
+/**
+ * The typed slash command with Muse's argument hint taken off. The hint (` [<model-id>]`) follows a
+ * complete command in Muse's muted chrome colour, the colour of the box's own bottom rule, and goes
+ * the moment an argument is typed, which arrives in the typed-text colour. So a trailing ` […]` run
+ * is the hint only when it wears the rule's colour; a literally typed `[x]` is kept.
+ */
+function withoutArgumentHint(row: StyledLine, rule: StyledLine, typed: string): string {
+  const last = row.segments.findLast((seg) => seg.text.trim() !== "");
+  const hint = last?.text.trim() ?? "";
+  if (last === undefined || !/^\[[^\]]*\]$/.test(hint) || !last.text.startsWith(" ")) return typed;
+  const ruleFg = rule.segments.find((seg) => seg.text.trim() !== "")?.fg;
+  if (ruleFg === undefined || last.fg !== ruleFg || !typed.endsWith(hint)) return typed;
+  return typed.slice(0, -hint.length).trimEnd();
+}
+
+/** Whether a palette row's command is painted bold, Muse's mark for the highlighted suggestion. */
+function rowIsHighlighted(row: StyledLine, command: string): boolean {
+  return row.segments.some((seg) => seg.bold === true && seg.text.trim() === command);
+}
+
 /** Whether Muse's free-text composer is on screen at the tail (the weaker, purely geometric claim). */
 export function hasComposer(lines: StyledLine[]): boolean {
   const tail = locateTail(lines);

web/src/lib/harness/muse/markers.ts

@@ -263,7 +263,10 @@ export function parseSubmitRow(text: string): { n: number; checked: number } | n
 // trimmed: the indent is structural. Only ever read under a slash-led prompt row (chrome.ts): the
 // palette opens for slash input alone, so that gate keeps a prose continuation starting with `/`
 // (a path) from parsing as a suggestion.
-const PALETTE_ROW = /^  (\/\S+)\s{2,}(\S.*)$/;
+//
+// Muse 1.4.8 lists skills in the same palette with their tags between the command and the gap
+// (`  /plan · built-in · default skill  On an explicit…`), so ` · tag` runs may follow the command.
+const PALETTE_ROW = /^  (\/\S+)(?: · [^·]+?)*\s{2,}(\S.*)$/;
 
 /** Parse a palette suggestion row into its command, or null. */
 export function parsePaletteRow(text: string): { command: string } | null {