diff --git a/src/soup_cli/commands/data.py b/src/soup_cli/commands/data.py
index 3df4489..92703dc 100644
--- a/src/soup_cli/commands/data.py
+++ b/src/soup_cli/commands/data.py
@@ -301,7 +301,7 @@ def dedup(
     semantic: bool = typer.Option(
         False, "--semantic",
         help="Use embedding cosine (SemDeDup) instead of MinHash. Catches "
-             "paraphrases MinHash misses. Requires soup-cli[train].",
+             "paraphrases MinHash misses. Requires soup-cli\\[train].",
     ),
     embed_model: str = typer.Option(
         DEFAULT_EMBED_MODEL, "--embed-model",
diff --git a/src/soup_cli/commands/eval.py b/src/soup_cli/commands/eval.py
index f2410b3..c0ccbbe 100644
--- a/src/soup_cli/commands/eval.py
+++ b/src/soup_cli/commands/eval.py
@@ -108,7 +108,7 @@ def benchmark(
     except ImportError:
         console.print(
             "[red]lm-eval not installed.[/]\n"
-            "Install with: [bold]pip install 'soup-cli[eval]'[/]"
+            "Install with: [bold]pip install 'soup-cli\\[eval]'[/]"
         )
         raise typer.Exit(1)
 
diff --git a/src/soup_cli/commands/export.py b/src/soup_cli/commands/export.py
index 96f61be..a43c88b 100644
--- a/src/soup_cli/commands/export.py
+++ b/src/soup_cli/commands/export.py
@@ -579,7 +579,7 @@ def _export_onnx(
     except ImportError:
         console.print(
             "[red]optimum not installed.[/]\n"
-            "Install with: [bold]pip install 'soup-cli[onnx]'[/]\n"
+            "Install with: [bold]pip install 'soup-cli\\[onnx]'[/]\n"
             "Or directly: [bold]pip install optimum[onnx][/]"
         )
         raise typer.Exit(1)
@@ -664,7 +664,7 @@ def _export_tensorrt(
     if not trtllm_available:
         console.print(
             "[red]tensorrt_llm not installed.[/]\n"
-            "Install with: [bold]pip install 'soup-cli[tensorrt]'[/]\n"
+            "Install with: [bold]pip install 'soup-cli\\[tensorrt]'[/]\n"
             "Or follow: https://github.com/NVIDIA/TensorRT-LLM#installation"
         )
         raise typer.Exit(1)
@@ -857,7 +857,7 @@ def _export_awq(
     except ImportError:
         console.print(
             "[red]autoawq not installed.[/]\n"
-            "Install with: [bold]pip install 'soup-cli[awq]'[/]\n"
+            "Install with: [bold]pip install 'soup-cli\\[awq]'[/]\n"
             "Or directly: [bold]pip install autoawq[/]"
         )
         raise typer.Exit(1)
@@ -989,7 +989,7 @@ def _export_gptq(
     except ImportError:
         console.print(
             "[red]auto-gptq not installed.[/]\n"
-            "Install with: [bold]pip install 'soup-cli[gptq]'[/]\n"
+            "Install with: [bold]pip install 'soup-cli\\[gptq]'[/]\n"
             "Or directly: [bold]pip install auto-gptq[/]"
         )
         raise typer.Exit(1)
diff --git a/src/soup_cli/commands/generate.py b/src/soup_cli/commands/generate.py
index d361ea5..46c28da 100644
--- a/src/soup_cli/commands/generate.py
+++ b/src/soup_cli/commands/generate.py
@@ -487,7 +487,7 @@ def _run_dedup_pipeline(path: Path) -> None:
     except ImportError:
         console.print(
             "[yellow]Dedup: datasketch not installed, skipping. "
-            "Install: pip install 'soup-cli[data]'[/]"
+            "Install: pip install 'soup-cli\\[data]'[/]"
         )
 
 
diff --git a/src/soup_cli/commands/merge_sharded_fsdp_weights.py b/src/soup_cli/commands/merge_sharded_fsdp_weights.py
index 0255c25..5906a91 100644
--- a/src/soup_cli/commands/merge_sharded_fsdp_weights.py
+++ b/src/soup_cli/commands/merge_sharded_fsdp_weights.py
@@ -70,7 +70,7 @@ def merge_sharded_fsdp_weights(
     except ImportError as exc:
         console.print(
             "[red]torch + safetensors are required for consolidation. "
-            "Install with: [bold]pip install 'soup-cli[train]'[/][/]"
+            "Install with: [bold]pip install 'soup-cli\\[train]'[/][/]"
         )
         raise typer.Exit(code=1) from exc
 
diff --git a/src/soup_cli/commands/serve.py b/src/soup_cli/commands/serve.py
index bb9d725..a9b3930 100644
--- a/src/soup_cli/commands/serve.py
+++ b/src/soup_cli/commands/serve.py
@@ -460,7 +460,7 @@ def serve(
     except ImportError:
         console.print(
             "[red]FastAPI/uvicorn not installed.[/]\n"
-            "Install with: [bold]pip install 'soup-cli[serve]'[/]"
+            "Install with: [bold]pip install 'soup-cli\\[serve]'[/]"
         )
         raise typer.Exit(1)
 
@@ -537,7 +537,7 @@ def serve(
         if not is_vllm_available():
             console.print(
                 "[red]vLLM not installed.[/]\n"
-                "Install with: [bold]pip install 'soup-cli[serve-fast]'[/]"
+                "Install with: [bold]pip install 'soup-cli\\[serve-fast]'[/]"
             )
             raise typer.Exit(1)
 
@@ -548,7 +548,7 @@ def serve(
         if not check_sglang_available():
             console.print(
                 "[red]SGLang not installed.[/]\n"
-                "Install with: [bold]pip install 'soup-cli[sglang]'[/]"
+                "Install with: [bold]pip install 'soup-cli\\[sglang]'[/]"
             )
             raise typer.Exit(1)
 
diff --git a/src/soup_cli/commands/train.py b/src/soup_cli/commands/train.py
index d9a2121..b96bea8 100644
--- a/src/soup_cli/commands/train.py
+++ b/src/soup_cli/commands/train.py
@@ -377,7 +377,7 @@ def train(
         "--track-energy",
         help=(
             "Measure the training window's energy + CO2 via codecarbon "
-            "(offline; requires `pip install soup-cli[carbon]`). Feeds the "
+            "(offline; requires `pip install soup-cli\\[carbon]`). Feeds the "
             "kWh / CO2 into --annex-xi. v0.71.3."
         ),
     ),
@@ -711,7 +711,7 @@ def train(
         except ImportError:
             console.print(
                 "[red]wandb not installed.[/]\n"
-                "Run: [bold]pip install 'soup-cli[wandb]'[/]"
+                "Run: [bold]pip install 'soup-cli\\[wandb]'[/]"
             )
             raise typer.Exit(1)
         except Exception as wandb_err:
@@ -1484,7 +1484,7 @@ def train(
         else:
             console.print(
                 "[yellow]--track-energy:[/] no reading "
-                "(install `pip install soup-cli[carbon]`)"
+                "(install `pip install soup-cli\\[carbon]`)"
             )
 
     # --- v0.71.15 #244 --energy-out: persist for `soup bom emit --energy` -
@@ -1504,7 +1504,7 @@ def train(
         else:
             console.print(
                 "[yellow]--energy-out skipped:[/] no energy reading "
-                "(set --track-energy + install `pip install soup-cli[carbon]`)"
+                "(set --track-energy + install `pip install soup-cli\\[carbon]`)"
             )
 
     # --- v0.59.0 --annex-xi: Annex XI/XII auto-doc -----------------------
diff --git a/src/soup_cli/commands/tui.py b/src/soup_cli/commands/tui.py
index 9b2a509..1c9c66b 100644
--- a/src/soup_cli/commands/tui.py
+++ b/src/soup_cli/commands/tui.py
@@ -17,7 +17,7 @@ console = Console()
 def _missing_dep_panel() -> str:
     return (
         "[red]Textual is not installed.[/]\n\n"
-        "[bold]Install:[/] pip install 'soup-cli[tui]'\n"
+        "[bold]Install:[/] pip install 'soup-cli\\[tui]'\n"
         "[dim]Or directly:[/] pip install textual"
     )
 
diff --git a/src/soup_cli/commands/ui.py b/src/soup_cli/commands/ui.py
index 1af3467..69a90b1 100644
--- a/src/soup_cli/commands/ui.py
+++ b/src/soup_cli/commands/ui.py
@@ -68,7 +68,7 @@ def ui(
     except ImportError:
         console.print(
             "[red]FastAPI/uvicorn not installed.[/]\n"
-            "Install with: [bold]pip install 'soup-cli[ui]'[/]"
+            "Install with: [bold]pip install 'soup-cli\\[ui]'[/]"
         )
         raise typer.Exit(1)
 
diff --git a/tests/test_v07136.py b/tests/test_v07136.py
index dbc1782..d9e10fb 100644
--- a/tests/test_v07136.py
+++ b/tests/test_v07136.py
@@ -378,6 +378,107 @@ class TestGreedySemdedup:
             rep.threshold = 0.5
 
 
+class TestExtrasHintsAreEscaped:
+    """Rich eats `[extra]` as a markup tag unless it is escaped.
+
+    Unescaped, `pip install 'soup-cli[eval]'` renders as
+    `pip install 'soup-cli'` -- which installs the base package WITHOUT the
+    extra the user is missing, so following the hint appears to succeed and
+    the feature still fails. Found during v0.71.36; same class as the
+    v0.71.28 \\[mcp] fix, which only fixed its own site.
+
+    Sites that do NOT go through Rich (plain exception text, docstrings)
+    must NOT be escaped -- a backslash would show up literally.
+    """
+
+    # Rich style tags. A hint string carrying one of these is console.print
+    # output; a bare `raise ImportError("... soup-cli[mlx]")` is NOT and must
+    # be left alone (escaping it would print a literal backslash).
+    _RICH_TAGS = ("[/]", "[bold]", "[red]", "[yellow]", "[green]", "[dim]")
+
+    def test_rich_renders_unescaped_bracket_away(self):
+        """Pin the underlying Rich behaviour this whole class exists for."""
+        from io import StringIO
+
+        from rich.console import Console
+
+        def render(markup):
+            buf = StringIO()
+            Console(file=buf, force_terminal=False, width=100).print(markup)
+            return buf.getvalue().strip()
+
+        assert render("[bold]pip install 'soup-cli[train]'[/]") == (
+            "pip install 'soup-cli'"
+        ), "unescaped bracket must be eaten (this is the bug)"
+        assert render("[bold]pip install 'soup-cli\\[train]'[/]") == (
+            "pip install 'soup-cli[train]'"
+        ), "escaped bracket must survive (this is the fix)"
+
+    def test_no_unescaped_extras_hint_in_rich_markup(self):
+        """Every hint carrying Rich markup must escape its bracket."""
+        import pathlib
+        import re
+
+        import soup_cli
+
+        root = pathlib.Path(soup_cli.__file__).parent
+        bad_re = re.compile(r"(?<!\\)soup-cli\[[a-z][a-z0-9-]*\]")
+        offenders = []
+        for path in sorted(root.rglob("*.py")):
+            rel = path.relative_to(root).as_posix()
+            for lineno, line in enumerate(
+                path.read_text(encoding="utf-8").splitlines(), start=1
+            ):
+                if line.strip().startswith("#"):
+                    continue  # a code comment never reaches Rich
+                if not any(tag in line for tag in self._RICH_TAGS):
+                    continue  # not Rich output — must NOT be escaped
+                if bad_re.search(line):
+                    offenders.append(f"{rel}:{lineno}: {line.strip()}")
+        assert not offenders, (
+            "unescaped soup-cli[extra] inside Rich markup — the bracket is "
+            "eaten and the printed command installs WITHOUT the extra:\n"
+            + "\n".join(offenders)
+        )
+
+    @pytest.mark.parametrize(
+        "argv,extra",
+        [
+            (["data", "dedup", "--help"], "soup-cli[train]"),
+            (["train", "--help"], "soup-cli[carbon]"),
+        ],
+    )
+    def test_typer_help_keeps_the_extra_bracket(self, argv, extra):
+        """Typer help is Rich-rendered too — the bracket must survive.
+
+        `--semantic` help shipped as "Requires soup-cli." before this fix.
+        """
+        from typer.testing import CliRunner
+
+        from soup_cli.cli import app
+
+        res = CliRunner(env={"COLUMNS": "200"}).invoke(app, argv)
+        assert res.exit_code == 0, (res.output, repr(res.exception))
+        assert extra in _clean(res.output), (
+            f"{extra!r} missing from `{' '.join(argv)}` — Rich ate the bracket"
+        )
+
+    def test_plain_exception_hints_are_not_escaped(self):
+        """The counter-rule: non-Rich text must NOT gain a backslash.
+
+        `raise ImportError("... pip install 'soup-cli[mlx]'")` never reaches
+        Rich, so escaping it would surface a literal backslash to the user.
+        """
+        import pathlib
+
+        import soup_cli
+
+        root = pathlib.Path(soup_cli.__file__).parent
+        text = (root / "trainer" / "mlx_sft.py").read_text(encoding="utf-8")
+        assert "'soup-cli[mlx]'" in text
+        assert "soup-cli\\[mlx]" not in text
+
+
 class TestDedupSemanticCli:
     def _write(self, tmp_path, rows):
         path = tmp_path / "data.jsonl"