diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6538610b..af0c2a3d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@
 
 ### Fixed
 
+- **Dotted Bedrock/Vertex model IDs get clean labels in the model picker.** Model IDs with dotted vendor prefixes (e.g. `anthropic.claude-*`) rendered awkwardly in the picker. They now get normalized display labels while the exact model IDs and provider grouping stay authoritative — distinct regional/vendor models remain separate entries, and live discovery still precedes the static fallback. Thanks @samfoy. (#6628)
+
+- **MCP dev dependency pinned to a compatible range.** The MCP SDK dev dependency was unpinned, so an incompatible 2.x install broke `mcp_server.py` with an `AttributeError`. It is now pinned to a compatible 1.x range with a bootstrap guard that exits with an actionable message on an incompatible version; the SDK remains optional (imports degrade gracefully when it is absent). Thanks @webtecnica. (#6616)
+
 - **Cancelling runs are no longer reattached on recovery.** A background run in the middle of cancellation could be resurrected by a reconnect/recovery reattach, producing a dying run that could double-deliver or churn. Recovery paths now exclude runs whose phase is `cancelling` (they stay busy but are not reattached), while genuinely-live runs still reattach; stale-cancelling reclamation is bounded (age ≥ 180s and absent from active streams) and idempotent. Thanks @allenliang2022. (#7096)
 
 - **GPT-5.6 models expose their full reasoning range.** The four GPT-5.6 model IDs support the `max` reasoning-effort level, but the capability filter capped them below that. The ceiling is now lifted for exactly those IDs on the OpenAI-family lanes (older GPT-5 and o-series ceilings unchanged), and `max` is offered only when the authoritative configured/live catalog includes it. Thanks @boudywho. (#7083)
diff --git a/api/config.py b/api/config.py
index 1428829c..5c2d5a48 100644
--- a/api/config.py
+++ b/api/config.py
@@ -6393,6 +6393,51 @@ def _get_label_for_model(model_id: str, existing_groups: list) -> str:
     # preserving vendor hierarchy for multi-slash IDs (#3360).
     # Skip for URI-scheme IDs whose slashes are path separators (#3429).
     bare = lookup_id.split("/", 1)[1] if ("/" in lookup_id and not _has_scheme(lookup_id)) else lookup_id
+    # Bedrock/Vertex IDs carry a dotted cross-region routing prefix and a vendor
+    # namespace -- ``us.anthropic.claude-opus-5``,
+    # ``mistral.mistral-large-2407-v1:0`` -- plus sometimes a trailing ``:<n>``
+    # provisioned-revision suffix. None of that belongs in a human label, which
+    # otherwise reads "Us.anthropic.claude Opus 5" in the turn footer.
+    #
+    # Only the two documented shapes are stripped, against a CLOSED allow-list.
+    # A generic "drop leading letters-only dot segments" loop rewrites any
+    # uncatalogued dotted ID: ``deepseek.v3`` renders as "V3" (vendor silently
+    # deleted) and ``foo.bar.baz`` as "BAZ".
+    #
+    # Inlined rather than factored into a module-level helper because the
+    # regression harnesses in tests/test_issue3429_* extract this function's
+    # source and eval it in isolation; a module-level call would NameError there.
+    # Kept in lockstep with ``_stripDottedModelPrefix()`` in static/ui.js --
+    # tests/test_dotted_model_label.py drives both from one table.
+    if bare and "." in bare and not _has_scheme(bare):
+        # ``global`` is a real Bedrock routing head, not just a region code --
+        # the catalog at api/config.py:1901-1909 ships six
+        # ``global.anthropic.claude-*`` IDs and the routing notes below use that
+        # as the canonical Bedrock shape. Omitting it left those labels reading
+        # "Global.anthropic.claude Opus 4 7".
+        _regions = {"us", "eu", "apac", "global", "us-gov"}
+        _vendors = {
+            "anthropic", "amazon", "meta", "mistral", "cohere", "ai21",
+            "stability", "writer", "deepseek", "qwen", "openai", "google",
+            # Bedrock foundation-model vendors added after the first pass. Without
+            # these, real IDs rendered with the namespace intact -- "Us.luma.ray 2",
+            # "Twelvelabs.marengo Embed 2 7", "Ibm.granite 3 8B Instruct".
+            "luma", "twelvelabs", "ibm", "nvidia", "snowflake",
+        }
+        _segs = bare.split(".")
+        _i = 0
+        if (len(_segs) - _i >= 3 and _segs[_i].lower() in _regions
+                and _segs[_i + 1].lower() in _vendors):
+            _i += 1
+        if len(_segs) - _i >= 2 and _segs[_i].lower() in _vendors:
+            # Dropping the vendor is only safe when what remains still names the
+            # model. A bare version remainder (``deepseek.v3``) means the vendor
+            # WAS the name.
+            _rest = ".".join(_segs[_i + 1:])
+            if not re.fullmatch(r"v?\d+(?:[.\-]\d+)*", _rest, re.IGNORECASE):
+                _i += 1
+        if _i > 0:
+            bare = re.sub(r":\d+$", "", ".".join(_segs[_i:]))
     return " ".join(
         w.upper() if (len(w) <= 3 and w.replace(".", "").isalnum() and not w.isdigit()) else w.capitalize()
         for w in bare.replace("_", "-").split("-")
diff --git a/mcp_server.py b/mcp_server.py
index 1eeeb900..1a49781f 100644
--- a/mcp_server.py
+++ b/mcp_server.py
@@ -7,7 +7,7 @@ Option A rewrite (2026-05-08): imports api.models and api.profiles
 directly from the webui codebase, using canonical helpers for
 locking, profile scoping, index consistency, and validation.
 
-    pip install "mcp<2"   # one-time setup
+    pip install "mcp>=1.28,<2"   # one-time setup
     python3 mcp_server.py # start via stdio
 
 MCP config for Hermes Agent (add to config.yaml):
@@ -447,6 +447,23 @@ async def handle_move_session(arguments: dict) -> list[TextContent]:
     }, ensure_ascii=False, indent=2))]
 
 
+# ═══════════════════════════════════════════════════════════════════════════
+#  MCP SDK version guard
+# ═════════════════════════════════════════════════════════════════════════==
+#
+# mcp>=2.0.0 removed the Server.list_tools / Server.call_tool decorator API
+# used by this server. Fail fast instead of producing secondary errors.
+
+if not hasattr(Server, "list_tools"):  # pragma: no cover
+    import sys
+    print(
+        "ERROR: mcp SDK incompatible. This server requires mcp>=1.28,<2 "
+        "(the 1.x Python SDK with the decorator API). "
+        "Run: pip install 'mcp>=1.28,<2'",
+        file=sys.stderr,
+    )
+    sys.exit(1)
+
 # ═══════════════════════════════════════════════════════════════════════════
 #  MCP Server wiring
 # ═══════════════════════════════════════════════════════════════════════════
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 78bcc82a..409a7f6c 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -8,7 +8,7 @@ pytest-timeout
 pytest-asyncio
 pytest-shard
 ruff
-mcp<2
+mcp>=1.28,<2
 # Optional Office parsers — runtime-optional (commented in requirements.txt), but
 # installed here so the workspace Office-preview tests (tests/test_issue540_*.py)
 # run under the documented ./scripts/test.sh entry point. These files
diff --git a/static/ui.js b/static/ui.js
index 47942122..bcd41c7b 100644
--- a/static/ui.js
+++ b/static/ui.js
@@ -7185,6 +7185,45 @@ function _fmtOllamaLabel(mid){
   return label;
 }
 
+// Bedrock cross-region inference routing heads. `global` belongs here too: the
+// catalog in api/config.py ships six `global.anthropic.claude-*` IDs and the
+// first-party routing notes treat that as the canonical Bedrock shape. Keep this
+// set byte-identical to _regions in api/config.py — backend catalog labels and
+// runtime picker fallback labels diverge otherwise.
+const _BEDROCK_REGION_PREFIXES = new Set(['us', 'eu', 'apac', 'global', 'us-gov']);
+// Vendor namespaces Bedrock/Vertex put in front of the real model id.
+const _DOTTED_VENDOR_PREFIXES = new Set([
+  'anthropic', 'amazon', 'meta', 'mistral', 'cohere', 'ai21',
+  'stability', 'writer', 'deepseek', 'qwen', 'openai', 'google',
+  // Bedrock foundation-model vendors added after the first pass. Without these,
+  // real IDs rendered with the namespace intact ("Us.luma.ray 2",
+  // "Twelvelabs.marengo Embed 2 7", "Ibm.granite 3 8B Instruct").
+  'luma', 'twelvelabs', 'ibm', 'nvidia', 'snowflake',
+]);
+/** Drop a Bedrock/Vertex dotted routing+vendor prefix from a model id.
+ *
+ *  Only the documented shapes are stripped — `<region>.<vendor>.<model>` and
+ *  `<vendor>.<model>` — plus a trailing `:<n>` provisioned-revision suffix.
+ *  Anything else is returned unchanged, so `deepseek.v3`, `foo.bar.baz` and the
+ *  version dot in `gpt-4.1` are never rewritten.
+ *
+ *  Mirrors _strip_dotted_provider_prefix() in api/config.py. */
+function _stripDottedModelPrefix(bare){
+  const value = String(bare || '');
+  if (!value || !value.includes('.') || value.includes('://') || value.startsWith('@')) return value;
+  const segs = value.split('.');
+  let i = 0;
+  if (segs.length - i >= 3 && _BEDROCK_REGION_PREFIXES.has((segs[i] || '').toLowerCase())
+      && _DOTTED_VENDOR_PREFIXES.has((segs[i + 1] || '').toLowerCase())) i++;
+  if (segs.length - i >= 2 && _DOTTED_VENDOR_PREFIXES.has((segs[i] || '').toLowerCase())) {
+    // Dropping the vendor is only safe when what remains still names the model.
+    // A bare version remainder (`deepseek.v3`) means the vendor WAS the name.
+    const remainder = segs.slice(i + 1).join('.');
+    if (!/^v?\d+(?:[.\-]\d+)*$/i.test(remainder)) i++;
+  }
+  if (i === 0) return value;
+  return segs.slice(i).join('.').replace(/:\d+$/, '');
+}
 function getModelLabel(modelId){
   if(!modelId) return 'Unknown';
   const rawId=String(modelId||'');
@@ -7246,6 +7285,41 @@ function getModelLabel(modelId){
   }
   // Strip @provider: prefix if present (e.g. @ollama-cloud:kimi-k2.6)
   if (_last.startsWith('@') && _last.includes(':')) _last = _last.split(':').slice(1).join(':');
+  // Bedrock/Vertex ids carry a dotted region + vendor prefix and sometimes a
+  // trailing `:<n>` version — `us.anthropic.claude-opus-5`,
+  // `us.anthropic.claude-sonnet-4-5-20250929-v1:0`. Left intact, the dotted head
+  // survives into the label as raw plumbing ("Us.anthropic.claude Opus 5" in the
+  // turn footer).
+  //
+  // Only the documented `<region>.<vendor>.<model>` / `<vendor>.<model>` shapes
+  // are stripped, via a CLOSED allow-list. A generic "drop leading letters-only
+  // dot segments" loop rewrites any uncatalogued id — `deepseek.v3` became "V3"
+  // and `foo.bar.baz` became "BAZ". Kept in lockstep with
+  // _strip_dotted_provider_prefix() in api/config.py; the paired test
+  // tests/test_dotted_model_label.py asserts both agree.
+  const _stripped = _stripDottedModelPrefix(_last);
+  if (_stripped !== _last) {
+    _last = _stripped;
+    // The normalized id is what the label tables are keyed on, so retry them —
+    // `us.anthropic.claude-sonnet-4-5` should land on the same "Sonnet 4.5" as
+    // `anthropic/claude-sonnet-4-5` rather than falling through to the raw id.
+    if (_dynamicModelLabels[_last]) return _dynamicModelLabels[_last];
+    if (STATIC_LABELS[_last]) return STATIC_LABELS[_last];
+    if (STATIC_LABELS['anthropic/' + _last]) return STATIC_LABELS['anthropic/' + _last];
+    // No table entry: prettify the Claude family the way the tables do — drop
+    // the `claude-` vendor word, the `-YYYYMMDD` date-pin and `-v1` revision
+    // (snapshot noise, not a name), then title-case. Bedrock is the only
+    // dotted-prefix source here, so this stays scoped to that path.
+    if (/^claude-/i.test(_last)) {
+      _last = _last
+        .replace(/^claude-/i, '')
+        .replace(/-v\d+$/i, '')
+        .replace(/-\d{8}$/, '')
+        .replace(/-/g, ' ')
+        .replace(/\b\w/g, c => c.toUpperCase())
+        .trim();
+    }
+  }
   const looksLikeOllamaTag = /^[a-z0-9][\w.-]*:[\w.-]+$/i.test(_last);
   const atProvider=(rawId.startsWith('@')&&rawId.includes(':'))
     ? rawId.slice(1,rawId.indexOf(':')).toLowerCase()
diff --git a/tests/test_dotted_model_label.py b/tests/test_dotted_model_label.py
new file mode 100644
index 00000000..f17ebb5c
--- /dev/null
+++ b/tests/test_dotted_model_label.py
@@ -0,0 +1,449 @@
+"""Dotted Bedrock/Vertex model-label normalization (split out of PR #6607).
+
+``us.anthropic.claude-opus-5`` carries a cross-region routing prefix and a vendor
+namespace. Left intact both survive into the human label, so the turn footer
+rendered "Us.anthropic.claude Opus 5".
+
+The normalization is implemented twice — inlined in ``_get_label_for_model()``
+(api/config.py) and as ``_stripDottedModelPrefix()`` (static/ui.js) — so these
+tests are PAIRED: one table drives both sides, and a divergence fails.
+
+The allow-list is closed on purpose. A generic "drop leading letters-only dot
+segments" loop rewrote arbitrary uncatalogued IDs (``deepseek.v3`` → "V3",
+``foo.bar.baz`` → "BAZ"); those cases are pinned below.
+"""
+from __future__ import annotations
+
+import json
+import shutil
+import subprocess
+import sys
+from pathlib import Path
+
+import pytest
+
+REPO_ROOT = Path(__file__).parent.parent.resolve()
+if str(REPO_ROOT) not in sys.path:
+    sys.path.insert(0, str(REPO_ROOT))
+
+from api.config import _get_label_for_model  # noqa: E402
+
+UI_JS = (REPO_ROOT / "static" / "ui.js").read_text(encoding="utf-8")
+
+
+def _derive_set_from_config(marker: str) -> set[str]:
+    """Read an allow-list out of PRODUCTION source instead of retyping it.
+
+    A retyped copy silently stops matching when the real set grows -- which is
+    exactly how ``global`` and then ``luma``/``twelvelabs``/``ibm`` shipped
+    mislabeled. Same technique as test_every_catalog_dotted_id_loses_its_routing_prefix.
+    """
+    import re as _re
+    config_src = (REPO_ROOT / "api" / "config.py").read_text(encoding="utf-8")
+    start = config_src.index(marker)
+    body = config_src[start:config_src.index("}", start)]
+    found = {m.lower() for m in _re.findall(r'"([a-z0-9-]+)"', body)}
+    assert found, f"could not derive {marker!r} from api/config.py"
+    return found
+
+
+_PRODUCTION_REGIONS = _derive_set_from_config("_regions = {")
+
+# (model_id, expected_normalized_id) — what the dotted-prefix step must leave
+# behind, BEFORE the shared cosmetic title-casing that both sides apply after.
+STRIP_CASES = [
+    # --- documented Bedrock/Vertex shapes: prefix is plumbing --------------
+    ("us.anthropic.claude-opus-5", "claude-opus-5"),
+    ("eu.anthropic.claude-sonnet-4-5-20250929-v1:0",
+     "claude-sonnet-4-5-20250929-v1"),
+    ("apac.anthropic.claude-haiku-4", "claude-haiku-4"),
+    # ``global`` is a routing head the catalog actually ships (six
+    # ``global.anthropic.claude-*`` IDs at api/config.py:1901-1909, and the
+    # first-party routing notes use it as the canonical Bedrock shape). Omitting
+    # it from the region set left every one of those labels reading
+    # "Global.anthropic.claude Opus 4 7".
+    ("global.anthropic.claude-opus-4-7", "claude-opus-4-7"),
+    ("global.anthropic.claude-opus-4-6-v1", "claude-opus-4-6-v1"),
+    ("global.anthropic.claude-sonnet-4-6", "claude-sonnet-4-6"),
+    ("global.anthropic.claude-opus-4-5-20251101-v1:0",
+     "claude-opus-4-5-20251101-v1"),
+    ("global.anthropic.claude-sonnet-4-5-20250929-v1:0",
+     "claude-sonnet-4-5-20250929-v1"),
+    ("global.anthropic.claude-haiku-4-5-20251001-v1:0",
+     "claude-haiku-4-5-20251001-v1"),
+    ("us-gov.anthropic.claude-opus-5", "claude-opus-5"),
+    ("mistral.mistral-large-2407-v1:0", "mistral-large-2407-v1"),
+    ("amazon.nova-pro-v1:0", "nova-pro-v1"),
+    ("meta.llama3-70b-instruct-v1:0", "llama3-70b-instruct-v1"),
+    # --- must be left BYTE-INTACT ------------------------------------------
+    # Vendor is the whole name: stripping it would render the model as "V3".
+    ("deepseek.v3", "deepseek.v3"),
+    # Uncatalogued vendor: not our shape, do not touch.
+    ("foo.bar.baz", "foo.bar.baz"),
+    ("acme.super-model-9", "acme.super-model-9"),
+    # A known region head with an unknown vendor is not our shape either.
+    ("us.foo.bar", "us.foo.bar"),
+    # Version dots must survive.
+    ("gpt-4.1", "gpt-4.1"),
+    ("qwen3.6-35b", "qwen3.6-35b"),
+    ("o1.5-preview", "o1.5-preview"),
+    # URI-scheme IDs are paths, not dotted namespaces.
+    ("https://host/v1.2/model", "https://host/v1.2/model"),
+    # No dot at all.
+    ("claude-opus-5", "claude-opus-5"),
+]
+
+# End-to-end labels through the real backend function.
+LABEL_CASES = [
+    ("us.anthropic.claude-opus-5", "Claude Opus 5"),
+    ("mistral.mistral-large-2407-v1:0", "Mistral Large 2407 V1"),
+    ("gpt-4.1", "GPT 4.1"),
+    ("qwen3.6-35b", "Qwen3.6 35B"),
+]
+
+
+@pytest.mark.parametrize("model_id,expected", LABEL_CASES)
+def test_backend_label_drops_dotted_plumbing(model_id, expected):
+    assert _get_label_for_model(model_id, []) == expected
+
+
+@pytest.mark.parametrize("model_id", [
+    "deepseek.v3", "foo.bar.baz", "acme.super-model-9", "us.foo.bar",
+])
+def test_backend_label_keeps_uncatalogued_vendor_name(model_id):
+    """The vendor word must not be silently deleted from an unknown ID."""
+    vendor = model_id.split(".")[0]
+    label = _get_label_for_model(model_id, [])
+    assert vendor.lower() in label.lower(), (
+        f"{model_id!r} lost its vendor: label={label!r}"
+    )
+
+
+def _js_strip(model_ids: list[str]) -> list[str]:
+    node = shutil.which("node")
+    if not node:
+        pytest.skip("node not available")
+
+    def extract(src: str, name: str) -> str:
+        start = src.index(f"function {name}(")
+        depth = 0
+        started = False
+        for i in range(start, len(src)):
+            if src[i] == "{":
+                depth += 1
+                started = True
+            elif src[i] == "}":
+                depth -= 1
+                if started and depth == 0:
+                    return src[start:i + 1]
+        raise AssertionError(f"unbalanced braces extracting {name}")
+
+    # The two Sets the helper closes over are declared immediately above it.
+    sets_start = UI_JS.index("const _BEDROCK_REGION_PREFIXES")
+    sets_end = UI_JS.index("function _stripDottedModelPrefix")
+    script = "\n".join([
+        UI_JS[sets_start:sets_end],
+        extract(UI_JS, "_stripDottedModelPrefix"),
+        "const ids = JSON.parse(process.argv[1]);",
+        "console.log(JSON.stringify(ids.map(_stripDottedModelPrefix)));",
+    ])
+    proc = subprocess.run(
+        [node, "--input-type=module", "-e", script, json.dumps(model_ids)],
+        capture_output=True, text=True, timeout=30, check=True,
+    )
+    return json.loads(proc.stdout)
+
+
+def test_frontend_strip_matches_the_table():
+    """The JS half must normalize exactly as specified — same table."""
+    ids = [c[0] for c in STRIP_CASES]
+    js = _js_strip(ids)
+    for (model_id, expected), js_out in zip(STRIP_CASES, js, strict=True):
+        assert js_out == expected, (
+            f"js drifted for {model_id!r}: js={js_out!r} expected={expected!r}"
+        )
+
+
+def _js_model_labels(model_ids: list[str]) -> dict[str, str]:
+    """Drive the REAL ``getModelLabel()`` from static/ui.js under Node.
+
+    ``_js_strip()`` above exercises only ``_stripDottedModelPrefix()``. That is
+    the wrong unit for a parity claim: ``getModelLabel()`` applies a whole retry
+    chain AFTER the strip (``_dynamicModelLabels`` → ``STATIC_LABELS`` →
+    ``'anthropic/' + id`` → a ``claude-`` prettifier). A test that stops at the
+    strip cannot observe any of it.
+
+    Only SINKS are stubbed (``_dynamicModelLabels`` starts empty, exactly as it
+    is before a catalog fetch; ``_fmtOllamaLabel`` is identity). Every decision
+    function is the shipped source, eval'd — so drift fails here instead of
+    rendering wrong in the picker.
+    """
+    node = shutil.which("node")
+    if not node:
+        pytest.skip("node not available")
+    proc = subprocess.run(
+        [node, "-e", _GET_MODEL_LABEL_DRIVER, str(REPO_ROOT / "static" / "ui.js"),
+         json.dumps(model_ids)],
+        capture_output=True, text=True, timeout=30,
+    )
+    assert proc.returncode == 0, f"node driver failed: {proc.stderr}"
+    return json.loads(proc.stdout)
+
+
+# Reuses the boundary-slicing approach already proven in
+# tests/test_issue3429_uri_scheme_model_label.py: regex literals inside
+# getModelLabel() defeat a naive brace counter, so bound it by the next
+# top-level function instead.
+_GET_MODEL_LABEL_DRIVER = r"""
+const fs = require('fs');
+const ui = fs.readFileSync(process.argv[1], 'utf8');
+const start = ui.indexOf('function getModelLabel(');
+if (start < 0) throw new Error('getModelLabel not found');
+const after = ui.indexOf('\nfunction _gatewayProviderName(', start);
+if (after < 0) throw new Error('getModelLabel end boundary not found');
+// Sinks only: no catalog has been fetched yet, so dynamic labels are empty.
+const _dynamicModelLabels = {};
+function _fmtOllamaLabel(s){ return s; }
+// The dotted normalizer and the two Sets it closes over sit just above
+// getModelLabel(); without them the eval'd function ReferenceErrors.
+const _stripStart = ui.indexOf('const _BEDROCK_REGION_PREFIXES');
+if (_stripStart < 0 || _stripStart > start) throw new Error('strip block not found');
+eval(ui.slice(_stripStart, start));
+eval(ui.slice(start, after));
+const out = {};
+for (const m of JSON.parse(process.argv[2])) out[m] = getModelLabel(m);
+process.stdout.write(JSON.stringify(out));
+"""
+
+
+def test_frontend_and_backend_agree_that_no_namespace_survives():
+    """The real contract, driven through the real ``getModelLabel()``.
+
+    NOT string equality of the two labels. The frontend and the backend are
+    deliberately different formatters and always have been: on the unmodified
+    base commit ``claude-opus-5`` (no dot, untouched by this change) already
+    labels as ``'claude-opus-5'`` in JS and ``'Claude Opus 5'`` in Python, and
+    ``openai/gpt-4o`` as ``'GPT-4o'`` vs ``'GPT 4O'``. Asserting equality would
+    fail on pre-existing behavior this PR does not touch.
+
+    The reason that divergence is not a bug: ``getModelLabel()`` consults
+    ``_dynamicModelLabels`` FIRST (static/ui.js:6991), and that map is populated
+    from the server's own ``label`` field (static/ui.js:3483, 3494, 3606). Once a
+    catalog is loaded the backend label wins in the UI. The JS formatter is the
+    pre-fetch fallback, so its job is to be no WORSE than the backend, not
+    byte-identical to it.
+
+    What must hold on both sides — the actual defect this PR fixes — is that no
+    routing/vendor namespace leaks into a human label.
+    """
+    ids = [c[0] for c in STRIP_CASES]
+    js_labels = _js_model_labels(ids)
+
+    for model_id, expected_stripped in STRIP_CASES:
+        js_label = js_labels[model_id]
+        py_label = _get_label_for_model(model_id, [])
+
+        # A namespace head is only "leaked" if it was supposed to be stripped.
+        # Cases pinned as byte-intact (deepseek.v3, foo.bar.baz, gpt-4.1) must
+        # KEEP their dotted head, so they are checked in the opposite direction:
+        # the head must still be present rather than silently deleted.
+        if expected_stripped == model_id:
+            if "." not in model_id:
+                # No dot at all (``claude-opus-5``): the dotted-prefix step is
+                # not involved. Nothing for this test to assert beyond the strip
+                # being a no-op.
+                assert _js_strip([model_id]) == [model_id], (
+                    f"dotted strip must be a no-op for {model_id!r}"
+                )
+                continue
+            if "://" in model_id:
+                # URI-scheme IDs are paths, not dotted namespaces.
+                # getModelLabel() deliberately renders the last meaningful path
+                # segment (the #3429 fix, pinned in
+                # tests/test_issue3429_uri_scheme_model_label.py), so a full-URL
+                # assertion here would contradict that test. What matters for
+                # THIS PR is only that the dotted-prefix strip left it alone.
+                assert _js_strip([model_id]) == [model_id], (
+                    f"dotted strip must not touch the URI-scheme id {model_id!r}"
+                )
+                continue
+            head = model_id.split(".", 1)[0].lower()
+            # Only a LETTERS-ONLY head is a namespace candidate. ``gpt-4.1``,
+            # ``qwen3.6-35b`` and ``o1.5-preview`` carry a VERSION dot, so their
+            # "head" (``gpt-4``) is not a namespace and title-casing legitimately
+            # reshapes it ("GPT 4.1"). What must hold for those is that the dot
+            # itself survives -- asserted directly below.
+            if head.replace("-", "").isalpha():
+                assert head in js_label.lower(), (
+                    f"{model_id!r} is pinned byte-intact but the frontend deleted "
+                    f"its head {head!r}: {js_label!r}"
+                )
+                assert head in py_label.lower(), (
+                    f"{model_id!r} is pinned byte-intact but the backend deleted "
+                    f"its head {head!r}: {py_label!r}"
+                )
+            else:
+                assert "." in js_label and "." in py_label, (
+                    f"{model_id!r} lost its version dot: js={js_label!r} "
+                    f"py={py_label!r}"
+                )
+            continue
+
+        head = model_id.split(".", 1)[0].lower()
+        for side, label in (("frontend", js_label), ("backend", py_label)):
+            assert f"{head}." not in label.lower(), (
+                f"{side} leaked the routing namespace for {model_id!r}: {label!r}"
+            )
+            # A REGION head must never survive as a leading word either
+            # ("Us anthropic claude Opus 5"). This check does NOT apply to a
+            # vendor head, because a vendor name legitimately reappears inside
+            # some model names -- ``mistral.mistral-large-2407-v1:0`` correctly
+            # labels as "Mistral Large 2407 V1". Same rule as
+            # test_known_bedrock_vendors_are_all_covered below.
+            if head in _PRODUCTION_REGIONS:
+                assert not label.lower().startswith(f"{head} "), (
+                    f"{side} kept the region head as a word for {model_id!r}: {label!r}"
+                )
+
+
+def test_frontend_retry_chain_reaches_the_static_label_table():
+    """Pin the behavior that makes the JS fallback WORTH having.
+
+    This is the post-strip chain the previous test could not see. Removing the
+    retry block at static/ui.js:7053-7071 leaves these rendering as raw IDs
+    (``'claude-sonnet-4-5'`` instead of ``'Sonnet 4.5'``) — verified by excising
+    the block and re-running this driver.
+    """
+    cases = {
+        # Lands on STATIC_LABELS['anthropic/claude-sonnet-4-5'] after the strip.
+        "us.anthropic.claude-sonnet-4-5": "Sonnet 4.5",
+        "eu.anthropic.claude-haiku-3-5": "Haiku 3.5",
+        # No table entry: the claude- prettifier drops the vendor word, the
+        # -YYYYMMDD date pin and the -v1 revision.
+        "global.anthropic.claude-opus-4-5-20251101-v1:0": "Opus 4 5",
+        "us-gov.anthropic.claude-opus-5": "Opus 5",
+    }
+    got = _js_model_labels(list(cases))
+    for model_id, expected in cases.items():
+        assert got[model_id] == expected, (
+            f"frontend label drift for {model_id!r}: {got[model_id]!r} != {expected!r}"
+        )
+    for label in got.values():
+        assert "claude-" not in label.lower(), f"vendor word survived: {label!r}"
+
+
+def test_every_catalog_dotted_id_loses_its_routing_prefix():
+    """Catalog-driven guard against region/vendor-set drift.
+
+    The allow-lists and the shipped catalog are two lists that must agree. They
+    didn't, twice: first ``global`` was missing (six IDs mislabeled), then
+    ``luma``/``twelvelabs``/``ibm`` were missing (real Bedrock vendors rendering
+    as "Us.luma.ray 2").
+
+    An earlier version of this test scraped only three-segment
+    ``<region>.<vendor>.<model>`` literals and therefore inspected **6** of the
+    **75** dotted catalog IDs — reassuring, but nearly blind. This version:
+
+    - scrapes ANY quoted ``id`` value (single or double quotes, any segment count);
+    - derives the offending prefixes from the PRODUCTION allow-lists rather than a
+      retyped copy, so a set that grows without test updates is still covered;
+    - skips version dots (``qwen3.6-plus``, ``gpt-5.4``), which are not namespaces.
+    """
+    import re as _re
+
+    config_src = (REPO_ROOT / "api" / "config.py").read_text(encoding="utf-8")
+
+    # Derive the real allow-lists out of production source, don't retype them.
+    def _set_literal(marker: str) -> set[str]:
+        start = config_src.index(marker)
+        body = config_src[start:config_src.index("}", start)]
+        return {m.lower() for m in _re.findall(r'"([a-z0-9-]+)"', body)}
+
+    regions = _set_literal("_regions = {")
+    vendors = _set_literal("_vendors = {")
+    assert regions and vendors, "could not derive allow-lists from api/config.py"
+    namespace_heads = regions | vendors
+
+    ids = {
+        i for i in _re.findall(r"""['"]id['"]\s*:\s*['"]([^'"]+)['"]""", config_src)
+        if "." in i
+    }
+    assert len(ids) > 20, f"catalog scrape found only {len(ids)} dotted ids"
+
+    offenders = []
+    for model_id in sorted(ids):
+        head = model_id.split(".")[0].lower()
+        # Only IDs whose head is a KNOWN namespace should be stripped; a version
+        # dot such as `qwen3.6-plus` has no namespace head and is left alone.
+        if head not in namespace_heads:
+            continue
+        label = _get_label_for_model(model_id, [])
+        if head in label.lower().replace(" ", "."):
+            offenders.append((model_id, label))
+
+    assert not offenders, (
+        "catalog IDs still carry a routing/vendor prefix in their label — add the "
+        f"missing head to the region/vendor sets: {offenders}"
+    )
+
+
+def test_known_bedrock_vendors_are_all_covered():
+    """Real Bedrock foundation-model vendors must all be in the allow-list.
+
+    These were shipping mislabeled: `luma.ray-2` rendered as "Luma.ray 2",
+    `us.twelvelabs.marengo-embed-2-7` as "Us.twelvelabs.marengo Embed 2 7".
+
+    The assertion is that no DOTTED NAMESPACE survives — not that the vendor word
+    is absent, because a vendor legitimately reappears inside some model names
+    (``mistral.mistral-large-2407`` → "Mistral Large 2407").
+    """
+    for model in [
+        "luma.ray-2",
+        "twelvelabs.marengo-embed-2-7",
+        "ibm.granite-3-8b-instruct",
+        "anthropic.claude-opus-5",
+        "amazon.nova-pro-v1:0",
+        "mistral.mistral-large-2407-v1:0",
+    ]:
+        head = model.split(".")[0]
+        label = _get_label_for_model(model, [])
+        assert f"{head}." not in label.lower(), (
+            f"{model!r} kept its vendor namespace: {label!r}"
+        )
+        # And with a region prefix in front.
+        regional = f"us.{model}"
+        rlabel = _get_label_for_model(regional, [])
+        assert "us." not in rlabel.lower() and f"{head}." not in rlabel.lower(), (
+            f"{regional!r} kept its namespace: {rlabel!r}"
+        )
+
+
+
+def test_global_region_is_recognized_in_both_implementations():
+    """Explicit pin for the reported gap, both sides."""
+    label = _get_label_for_model("global.anthropic.claude-opus-4-7", [])
+    assert "global" not in label.lower(), label
+    assert "anthropic" not in label.lower(), label
+    assert _js_strip(["global.anthropic.claude-opus-4-7"]) == [
+        "claude-opus-4-7"
+    ]
+
+
+def test_frontend_helper_exists_and_is_used():
+    assert "function _stripDottedModelPrefix" in UI_JS
+    assert "_stripDottedModelPrefix(_last)" in UI_JS
+    # The generic letters-only loop must be gone.
+    assert "/^[a-z]+$/i.test(_segs[_i]" not in UI_JS
+
+
+def test_backend_uses_a_closed_allow_list():
+    """Guard the design: the fix must not regress to a generic prefix loop."""
+    config_src = (REPO_ROOT / "api" / "config.py").read_text(encoding="utf-8")
+    idx = config_src.index("def _get_label_for_model")
+    block = config_src[idx:idx + 4000]
+    assert "_regions" in block and "_vendors" in block, (
+        "the dotted-prefix strip must be gated on explicit provider allow-lists"
+    )
+    assert "while _i < len(_segs) - 1 and _segs[_i].isalpha()" not in block, (
+        "the generic letters-only loop rewrites uncatalogued IDs"
+    )
diff --git a/tests/test_issue3429_uri_scheme_model_label.py b/tests/test_issue3429_uri_scheme_model_label.py
index a8228d9b..09acdefa 100644
--- a/tests/test_issue3429_uri_scheme_model_label.py
+++ b/tests/test_issue3429_uri_scheme_model_label.py
@@ -37,6 +37,13 @@ if (after < 0) throw new Error('getModelLabel end boundary not found');
 const fnSrc = ui.slice(start, after);
 const _dynamicModelLabels = {};
 function _fmtOllamaLabel(s){ return s; }
+// getModelLabel() calls the dotted Bedrock/Vertex prefix normalizer, which lives
+// just above it with two Sets it closes over. Pull all three in, or the eval'd
+// function ReferenceErrors on the first dotted id.
+const _stripStart = ui.indexOf('const _BEDROCK_REGION_PREFIXES');
+const _stripEnd = ui.indexOf('function getModelLabel(');
+if (_stripStart < 0 || _stripStart > _stripEnd) throw new Error('_stripDottedModelPrefix block not found');
+eval(ui.slice(_stripStart, _stripEnd));
 eval(fnSrc);
 const out = {};
 for (const m of JSON.parse(process.argv[2])) out[m] = getModelLabel(m);