Give non-latin names their own URL, and stop caching under test

config/test.exs

@@ -49,3 +49,8 @@ config :mcp_registry, :discovery,
 config :mcp_registry, :official_registry,
   page_delay_ms: 0,
   req_options: [plug: {Req.Test, McpRegistry.OfficialRegistry}, retry_delay: 0, max_retries: 2]
+
+# Off under test: the cache table is global while async tests each hold their
+# own database sandbox, so one test can be served a value computed from rows
+# another test can see and it cannot. See McpRegistry.Cache.
+config :mcp_registry, :cache_enabled, false

lib/mcp_registry/cache.ex

@@ -15,6 +15,14 @@ defmodule McpRegistry.Cache do
   Reads go straight to ETS with no GenServer in the path, so a hot page does
   not serialise behind a single process. The GenServer exists only to own the
   table so it survives the caller.
+
+  ## Off under test
+
+  The table is global while `async: true` tests each hold their own database
+  sandbox, so a value one test computed can be handed to another that cannot
+  see the rows behind it. That is a flaky failure with no bearing on the code
+  under test, and caching a count nobody is measuring buys nothing, so
+  `config/test.exs` turns it off.
   """
   use GenServer
 
@@ -34,6 +42,14 @@ defmodule McpRegistry.Cache do
   must never be the reason something fails.
   """
   def fetch(key, ttl \\ nil, fun) when is_function(fun, 0) do
+    if Application.get_env(:mcp_registry, :cache_enabled, true) do
+      cached(key, ttl, fun)
+    else
+      fun.()
+    end
+  end
+
+  defp cached(key, ttl, fun) do
     ttl = ttl || day()
     now = System.monotonic_time(:millisecond)
 

lib/mcp_registry/registry/capability.ex

@@ -33,9 +33,17 @@ defmodule McpRegistry.Registry.Capability do
   slug and cost length. Other schemes stay: `file`, `ui` and `s3` distinguish
   resources that would otherwise read alike.
 
-  Two names can in principle collide — `review_diff` and `review-diff`, or
-  the same URL under both http and https. `find/2` then answers with the
-  first, which is a worse page than it could be but never a wrong one.
+  A name with no Latin letters or digits at all — 192 of the catalogue's
+  21,837 prompts and resources are written in scripts that have none — would
+  otherwise reduce to nothing, and every such name on a server would collide
+  on the same empty slug with only the first reachable. Those fall back to a
+  short hash of the name, which is an unlovely URL but a working one, and the
+  page still shows the name as its publisher wrote it.
+
+  Two names that both survive can still in principle collide — `review_diff`
+  and `review-diff`, or the same URL under http and https. `find/2` then
+  answers with the first, which is a worse page than it could be but never a
+  wrong one.
   """
   def slug(name) when is_binary(name) do
     name
@@ -45,11 +53,21 @@ defmodule McpRegistry.Registry.Capability do
     |> String.trim("-")
     |> String.slice(0, 120)
     |> case do
-      "" -> "item"
+      "" -> "item-" <> hash(name)
       slug -> slug
     end
   end
 
+  # Stable across runs and processes: `:erlang.phash2/1` is specified to be
+  # portable, unlike `:erlang.phash/2`, so a URL minted today still resolves
+  # tomorrow. Base 36 keeps it short.
+  defp hash(name) do
+    name
+    |> :erlang.phash2()
+    |> Integer.to_string(36)
+    |> String.downcase()
+  end
+
   @doc """
   Finds the entry whose slug matches, or `nil`.
 

test/mcp_registry_web/live/capabilities_test.exs

@@ -31,6 +31,18 @@ defmodule McpRegistryWeb.ServerLive.CapabilitiesTest do
       assert Capability.slug("ui://widget/x") == "ui-widget-x"
     end
 
+    test "a name with no latin characters still gets its own URL" do
+      # 192 of the catalogue's items are written in scripts with no latin
+      # letters at all. Reduced to nothing they would share one slug, and
+      # only the first on each server would have been reachable.
+      a = Capability.slug("文档")
+      b = Capability.slug("指南")
+
+      refute a == b
+      refute a == "item"
+      assert Capability.find(["文档", "指南"], b) == "指南"
+    end
+
     test "find matches on the slug, so a rewritten name is still reachable" do
       items = ["file:///alerts.json", "review_diff"]