wip -- devserver

Author: realark

braintrust-sdk/src/main/java/dev/braintrust/config/BraintrustConfig.java

@@ -64,6 +64,13 @@ public final class BraintrustConfig extends BaseConfig {
     /** Custom X509 trust manager for OTLP exporter. Builder-only field, not backed by envars. */
     private final X509TrustManager x509TrustManager;
 
+    /**
+     * Maximum number of eval cases the remote eval devserver evaluates concurrently. Matches {@link
+     * dev.braintrust.eval.Eval#DEFAULT_MAX_CONCURRENCY}.
+     */
+    private final int devserverMaxConcurrency =
+            getConfig("BRAINTRUST_DEVSERVER_MAX_CONCURRENCY", 10);
+
     /** CORS origins to allow when running remote eval devserver */
     private final String devserverCorsOriginWhitelistCsv =
             getConfig(
@@ -260,6 +267,12 @@ public Builder devserverCorsOriginWhitelistCsv(String csv) {
             return this;
         }
 
+        public Builder devserverMaxConcurrency(int maxConcurrency) {
+            envOverrides.put(
+                    "BRAINTRUST_DEVSERVER_MAX_CONCURRENCY", String.valueOf(maxConcurrency));
+            return this;
+        }
+
         public BraintrustConfig build() {
             return new BraintrustConfig(envOverrides, sslContext, x509TrustManager);
         }