fix: switch mutated anthropic provider to native AnthropicSchema

- override_providers!: anthropic now uses AnthropicSchema() + /v1 stripped base URL
- openai stays ChatCompletionSchema() on full base URL
- Add mutate regression test: schema type, base_url, cache_control emission

Author: Sixzero

src/OpenRouterCLIProxyAPI.jl

@@ -169,19 +169,27 @@ Set `gemini=true` to also override google-ai-studio.
 """
 function override_providers!(base_url::String, api_key_env_var::String;
                              gemini::Bool=false, verbose::Bool=false)
-    schemas = Dict("anthropic" => ChatCompletionAnthropicSchema(), "openai" => ChatCompletionSchema())
-    for name in ("anthropic", "openai")
-        set_provider!(
-            name,
-            base_url,
-            "Bearer",
-            api_key_env_var,
-            Dict{String,String}(),
-            cli_proxy_model_transform,
-            schemas[name],
-            "$name (overridden to cli_proxy_api)"
-        )
-    end
+    anthropic_base_url = replace(base_url, r"/v1/?$" => "")
+    set_provider!(
+        "anthropic",
+        anthropic_base_url,
+        "Bearer",
+        api_key_env_var,
+        Dict{String,String}(),
+        cli_proxy_model_transform,
+        AnthropicSchema(),
+        "anthropic (overridden to cli_proxy_api)"
+    )
+    set_provider!(
+        "openai",
+        base_url,
+        "Bearer",
+        api_key_env_var,
+        Dict{String,String}(),
+        cli_proxy_model_transform,
+        ChatCompletionSchema(),
+        "openai (overridden to cli_proxy_api)"
+    )
 
     if gemini
         google_proxy_transform(id::AbstractString) = replace(id, r"^google/" => "")

test/runtests.jl

@@ -1,10 +1,46 @@
 using OpenRouterCLIProxyAPI
 using Test
 using Aqua
+using OpenRouter
+using OpenRouter: AnthropicSchema, ChatCompletionSchema, build_payload, get_provider_info, set_provider!
+
+function restore_provider!(name::String, info)
+    set_provider!(
+        name,
+        info.base_url,
+        info.auth_header_format,
+        info.api_key_env_var,
+        copy(info.default_headers),
+        info.model_name_transform,
+        info.schema,
+        info.notes,
+    )
+end
 
 @testset "OpenRouterCLIProxyAPI.jl" begin
     @testset "Code quality (Aqua.jl)" begin
         # Aqua.test_all(OpenRouterCLIProxyAPI)
     end
-    # Write your tests here.
+
+    @testset "mutate keeps Anthropic native request shape for caching" begin
+        original = Dict(name => get_provider_info(name) for name in ("anthropic", "openai", "google-ai-studio"))
+
+        try
+            setup_cli_proxy!(; mutate=true, base_url="http://localhost:8317/v1")
+
+            anthropic = get_provider_info("anthropic")
+            openai = get_provider_info("openai")
+
+            @test anthropic.schema isa AnthropicSchema
+            @test anthropic.base_url == "http://localhost:8317"
+            @test openai.schema isa ChatCompletionSchema
+            @test openai.base_url == "http://localhost:8317/v1"
+            @test build_payload(anthropic.schema, "hello", "claude-3-5-haiku-20241022", nothing, false; cache=:last)["messages"][1]["content"][1]["cache_control"] == Dict("type" => "ephemeral")
+        finally
+            for (name, info) in original
+                set_provider!(name, info.base_url, info.auth_header_format, info.api_key_env_var,
+                    copy(info.default_headers), info.model_name_transform, info.schema, info.notes)
+            end
+        end
+    end
 end