1 files changed, 81 insertions, 0 deletions

diff --git a/src/config_file.zig b/src/config_file.zig
index 229a5b2..e5bbe99 100644
--- a/src/config_file.zig
+++ b/src/config_file.zig
@@ -146,6 +146,10 @@ pub fn buildProviderConfig(
             .model = wire_model,
             .api_version = if (def_opt) |d| (d.api_version orelse "2023-06-01") else "2023-06-01",
             .max_tokens = max_tokens,
+            .thinking = if (def_opt) |d| d.thinking else .enabled,
+            .effort = if (def_opt) |d| d.effort else .medium,
+            .thinking_budget_tokens = if (def_opt) |d| d.thinking_budget_tokens else 32_000,
+            .thinking_interleaved = if (def_opt) |d| d.thinking_interleaved else false,
         } },
     }
 }
@@ -911,6 +915,10 @@ test "buildProviderConfig: anthropic ref pulls knobs from model defs" {
         .reasoning = .high,
         .max_tokens = 8192,
         .api_version = try a.dupe(u8, "2023-06-01"),
+        .thinking = .enabled,
+        .effort = .medium,
+        .thinking_budget_tokens = 16_000,
+        .thinking_interleaved = false,
     });
 
     const ref = try parseModelRef("anthropic:sonnet");
@@ -919,6 +927,10 @@ test "buildProviderConfig: anthropic ref pulls knobs from model defs" {
     try testing.expectEqualStrings("claude-sonnet-4-20250514", pc.anthropic_messages.model);
     try testing.expectEqual(@as(u32, 8192), pc.anthropic_messages.max_tokens);
     try testing.expectEqualStrings("sk-ant", pc.anthropic_messages.api_key);
+    try testing.expectEqual(panto.Thinking.enabled, pc.anthropic_messages.thinking);
+    try testing.expectEqual(panto.Effort.medium, pc.anthropic_messages.effort);
+    try testing.expectEqual(@as(?u32, 16_000), pc.anthropic_messages.thinking_budget_tokens);
+    try testing.expectEqual(false, pc.anthropic_messages.thinking_interleaved);
 }
 
 test "buildProviderConfig: missing alias uses the alias verbatim as wire model" {
@@ -947,6 +959,75 @@ test "buildProviderConfig: missing alias uses the alias verbatim as wire model"
     try testing.expectEqual(panto.ReasoningEffort.default, pc.openai_chat.reasoning);
 }
 
+test "buildProviderConfig: anthropic adaptive thinking threaded from model def" {
+    const a = testing.allocator;
+    var env = emptyEnv(a);
+    defer env.deinit();
+    try env.put("ANTHROPIC_API_KEY", "sk-ant");
+
+    const src =
+        \\[providers.anthropic]
+        \\style = "anthropic_messages"
+        \\base_url = "https://api.anthropic.com"
+        \\api_key_env_var = "ANTHROPIC_API_KEY"
+    ;
+    const doc = try parseDoc(a, src);
+    defer doc.deinit();
+    var cfg = try resolve(a, &env, doc.root);
+    defer cfg.deinit();
+
+    var models = models_toml.ModelRegistry.init(a);
+    defer models.deinit();
+    try models.entries.append(a, .{
+        .provider = try a.dupe(u8, "anthropic"),
+        .alias = try a.dupe(u8, "opus"),
+        .model = try a.dupe(u8, "claude-opus-4-8"),
+        .reasoning = .default,
+        .max_tokens = null,
+        .api_version = null,
+        .thinking = .adaptive,
+        .effort = .high,
+        .thinking_budget_tokens = null,
+        .thinking_interleaved = false,
+    });
+
+    const ref = try parseModelRef("anthropic:opus");
+    const pc = try buildProviderConfig(&cfg, &models, ref);
+    try testing.expectEqual(panto.Thinking.adaptive, pc.anthropic_messages.thinking);
+    try testing.expectEqual(panto.Effort.high, pc.anthropic_messages.effort);
+    try testing.expectEqual(@as(?u32, null), pc.anthropic_messages.thinking_budget_tokens);
+}
+
+test "buildProviderConfig: anthropic missing alias falls back to struct defaults" {
+    const a = testing.allocator;
+    var env = emptyEnv(a);
+    defer env.deinit();
+    try env.put("ANTHROPIC_API_KEY", "sk-ant");
+
+    const src =
+        \\[providers.anthropic]
+        \\style = "anthropic_messages"
+        \\base_url = "https://api.anthropic.com"
+        \\api_key_env_var = "ANTHROPIC_API_KEY"
+    ;
+    const doc = try parseDoc(a, src);
+    defer doc.deinit();
+    var cfg = try resolve(a, &env, doc.root);
+    defer cfg.deinit();
+
+    var models = models_toml.ModelRegistry.init(a);
+    defer models.deinit();
+
+    // No model def at all — alias used verbatim, defaults applied.
+    const ref = try parseModelRef("anthropic:claude-haiku-4-5-20251001");
+    const pc = try buildProviderConfig(&cfg, &models, ref);
+    try testing.expectEqual(APIStyle.anthropic_messages, pc.style());
+    try testing.expectEqual(panto.Thinking.enabled, pc.anthropic_messages.thinking);
+    try testing.expectEqual(panto.Effort.medium, pc.anthropic_messages.effort);
+    try testing.expectEqual(@as(?u32, 32_000), pc.anthropic_messages.thinking_budget_tokens);
+    try testing.expectEqual(false, pc.anthropic_messages.thinking_interleaved);
+}
+
 test "buildProviderConfig: unknown provider errors" {
     const a = testing.allocator;
     var env = emptyEnv(a);