fix anthropic thinking effort json placement

1 files changed, 9 insertions, 3 deletions

diff --git a/libpanto/src/anthropic_messages_json.zig b/libpanto/src/anthropic_messages_json.zig
index 3ad6069..99d89eb 100644
--- a/libpanto/src/anthropic_messages_json.zig
+++ b/libpanto/src/anthropic_messages_json.zig
@@ -55,7 +55,7 @@ pub fn serializeRequest(
     // Extended thinking configuration.
     // `.disabled`  — omit the field entirely.
     // `.enabled`   — manual budget: { type, budget_tokens, display }.
-    // `.adaptive`  — adaptive mode: { type, display } + top-level effort.
+    // `.adaptive`  — adaptive mode: { type, display } + output_config.effort.
     switch (cfg.thinking) {
         .disabled => {},
         .enabled => {
@@ -82,8 +82,11 @@ pub fn serializeRequest(
             try s.objectField("display");
             try s.write("summarized");
             try s.endObject();
+            try s.objectField("output_config");
+            try s.beginObject();
             try s.objectField("effort");
             try s.write(@tagName(cfg.effort));
+            try s.endObject();
         },
     }
 
@@ -1285,7 +1288,9 @@ test "serializeRequest - thinking adaptive default effort" {
     try testing.expectEqualStrings("adaptive", th.get("type").?.string);
     try testing.expectEqualStrings("summarized", th.get("display").?.string);
     try testing.expect(th.get("budget_tokens") == null);
-    try testing.expectEqualStrings("medium", root.get("effort").?.string);
+    try testing.expect(root.get("effort") == null);
+    const oc = root.get("output_config").?.object;
+    try testing.expectEqualStrings("medium", oc.get("effort").?.string);
 }
 
 test "serializeRequest - thinking adaptive explicit effort levels" {
@@ -1312,7 +1317,8 @@ test "serializeRequest - thinking adaptive explicit effort levels" {
 
         var parsed = try std.json.parseFromSlice(std.json.Value, allocator, body, .{});
         defer parsed.deinit();
-        try testing.expectEqualStrings(entry.name, parsed.value.object.get("effort").?.string);
+        const oc = parsed.value.object.get("output_config").?.object;
+        try testing.expectEqualStrings(entry.name, oc.get("effort").?.string);
     }
 }