diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
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diff --git a/README.md b/README.md
index ee397a7..0e558fc 100644
--- a/README.md
+++ b/README.md
@@ -112,6 +112,57 @@ That is the entire integration. No schema changes, no new infrastructure.
| `jamjet-runtime-plugins` | ClassLoader-isolated plugin system with ServiceLoader and hot-reload |
| `jamjet-runtime-server` | Standalone Javalin REST server — same API surface as the Rust runtime |
| `jamjet-spring-boot-starter` | Spring Boot auto-configuration: embeds the runtime as Spring beans |
+| `jamjet-cloud-sdk` | Drop-in observability for Spring AI / LangChain4j (mirrors Python `jamjet.cloud`) |
+| `jamjet-cloud-spring-boot-starter` | Spring Boot auto-config for the Cloud SDK |
+
+---
+
+## JamJet Cloud SDK
+
+Drop-in observability for Spring AI and LangChain4j agents. Mirrors the Python `jamjet.cloud` SDK.
+
+### Spring Boot
+
+```xml
+
+ dev.jamjet
+ jamjet-cloud-spring-boot-starter
+ 0.2.0
+
+```
+
+```yaml
+# application.yml
+jamjet:
+ cloud:
+ api-key: ${JJ_API_KEY}
+ project: my-app
+```
+
+That's it. Every Spring AI `ChatClient` / `ChatModel` call and every LangChain4j `ChatLanguageModel` call is captured automatically.
+
+### Plain Java (LangChain4j without Spring)
+
+```xml
+
+ dev.jamjet
+ jamjet-cloud-sdk
+ 0.2.0
+
+```
+
+```java
+JamjetCloud.configure(JamjetCloudConfig.builder()
+ .apiKey(System.getenv("JJ_API_KEY"))
+ .project("my-app")
+ .build());
+
+var model = OpenAiChatModel.builder()
+ .apiKey(System.getenv("OPENAI_API_KEY"))
+ .modelName("gpt-4o-mini")
+ .listeners(List.of(new JamjetChatModelListener()))
+ .build();
+```
---
diff --git a/jamjet-cloud-sdk/pom.xml b/jamjet-cloud-sdk/pom.xml
index da671a7..099e0f1 100644
--- a/jamjet-cloud-sdk/pom.xml
+++ b/jamjet-cloud-sdk/pom.xml
@@ -7,7 +7,7 @@
dev.jamjetjamjet-runtime-java-parent
- 0.1.1
+ 0.2.0jamjet-cloud-sdk
@@ -35,11 +35,50 @@
slf4j-api
+
+
+ io.micrometer
+ micrometer-observation
+ 1.13.6
+ true
+
+
+
+
+ dev.langchain4j
+ langchain4j-core
+ 0.36.2
+ true
+
+
org.junit.jupiterjunit-jupitertest
+
+ org.assertj
+ assertj-core
+ test
+
+
+ dev.langchain4j
+ langchain4j-open-ai
+ 0.36.2
+ test
+
+
+ org.wiremock
+ wiremock-standalone
+ 3.9.2
+ test
+
+
+ org.awaitility
+ awaitility
+ 4.2.2
+ test
+
diff --git a/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/FailureModeClassifier.java b/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/FailureModeClassifier.java
new file mode 100644
index 0000000..90872e3
--- /dev/null
+++ b/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/FailureModeClassifier.java
@@ -0,0 +1,43 @@
+package dev.jamjet.cloud;
+
+import java.net.SocketTimeoutException;
+import java.net.http.HttpTimeoutException;
+import java.time.Duration;
+import java.util.regex.Pattern;
+
+/**
+ * Maps a Throwable to a string failure_mode that matches the cloud's
+ * events_failure_mode_check constraint and the Python SDK enum.
+ *
+ *
Cross-SDK contract: same string values for rate_limit, auth, timeout,
+ * bad_request, server_error, unknown.
+ */
+public final class FailureModeClassifier {
+
+ private static final Pattern STATUS_4XX_5XX = Pattern.compile("(?i)\\b(?:HTTP\\s+|status(?:\\s+code)?\\s*:?\\s*)?([45]\\d{2})\\b");
+
+ private FailureModeClassifier() {}
+
+ public static String classify(Throwable t) {
+ return classify(t, null);
+ }
+
+ public static String classify(Throwable t, Duration ignored) {
+ if (t == null) return "unknown";
+ if (t instanceof SocketTimeoutException || t instanceof HttpTimeoutException) {
+ return "timeout";
+ }
+ String msg = t.getMessage();
+ if (msg != null) {
+ var m = STATUS_4XX_5XX.matcher(msg);
+ if (m.find()) {
+ int status = Integer.parseInt(m.group(1));
+ if (status == 429) return "rate_limit";
+ if (status == 401 || status == 403) return "auth";
+ if (status >= 400 && status < 500) return "bad_request";
+ if (status >= 500) return "server_error";
+ }
+ }
+ return "unknown";
+ }
+}
diff --git a/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/JamjetCloud.java b/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/JamjetCloud.java
index e17c9a1..0d1b91f 100644
--- a/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/JamjetCloud.java
+++ b/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/JamjetCloud.java
@@ -110,7 +110,8 @@ static CloudHttpClient httpClient() {
return httpClient;
}
- static JamjetCloudConfig config() {
+ /** Public for instrumentation modules outside this package. May return null before configure(). */
+ public static JamjetCloudConfig config() {
return config;
}
diff --git a/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/Span.java b/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/Span.java
index aebadc4..e599799 100644
--- a/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/Span.java
+++ b/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/Span.java
@@ -29,6 +29,7 @@ public final class Span {
private Double costUsd;
private String status = "pending";
private String failureMode;
+ private java.util.Map payload;
Span(String traceId, String spanId, String kind, String name, int sequence,
String agentName, String agentCardUri) {
@@ -48,6 +49,10 @@ public final class Span {
public Span outputTokens(long v) { this.outputTokens = v; return this; }
public Span costUsd(double v) { this.costUsd = v; return this; }
+ public Span payload(java.util.Map v) { this.payload = v; return this; }
+
+ public java.util.Map payload() { return payload; }
+
/** Mark the span complete with status="ok" and emit it. */
public void finish() {
finish("ok");
@@ -71,7 +76,7 @@ public void fail(String mode) {
finish("error");
}
- Map toEventMap() {
+ public Map toEventMap() {
Map m = new LinkedHashMap<>();
m.put("type", "span");
m.put("trace_id", traceId);
@@ -89,6 +94,7 @@ Map toEventMap() {
if (agentName != null) m.put("agent_name", agentName);
if (agentCardUri != null) m.put("agent_card_uri", agentCardUri);
if (failureMode != null) m.put("failure_mode", failureMode);
+ if (payload != null) m.put("payload", payload);
return m;
}
diff --git a/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/instrumentation/langchain4j/JamjetChatModelListener.java b/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/instrumentation/langchain4j/JamjetChatModelListener.java
new file mode 100644
index 0000000..98640e2
--- /dev/null
+++ b/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/instrumentation/langchain4j/JamjetChatModelListener.java
@@ -0,0 +1,94 @@
+package dev.jamjet.cloud.instrumentation.langchain4j;
+
+import dev.jamjet.cloud.FailureModeClassifier;
+import dev.jamjet.cloud.JamjetCloud;
+import dev.jamjet.cloud.JamjetCloudConfig;
+import dev.jamjet.cloud.Span;
+import dev.langchain4j.model.chat.listener.ChatModelErrorContext;
+import dev.langchain4j.model.chat.listener.ChatModelListener;
+import dev.langchain4j.model.chat.listener.ChatModelRequestContext;
+import dev.langchain4j.model.chat.listener.ChatModelResponseContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * Bridges LangChain4j {@code ChatModelListener} callbacks to the JamJet
+ * Cloud event stream. Mirrors {@code JamjetObservationHandler} for the
+ * Spring AI path — same kind ("llm_call"), same payload shape.
+ *
+ *
Honors {@link JamjetCloudConfig#captureIo()}: when false, prompt and
+ * response payloads are omitted (server-side redaction is the authoritative
+ * backstop on Team+ tier).
+ */
+public final class JamjetChatModelListener implements ChatModelListener {
+
+ private static final Logger LOG = LoggerFactory.getLogger(JamjetChatModelListener.class);
+ private static final String SCOPE_KEY = "jamjet.span";
+
+ @Override
+ public void onRequest(ChatModelRequestContext rc) {
+ try {
+ String model = rc.request().model();
+ String name = "langchain4j." + (model != null ? model : "chat");
+ Span span = JamjetCloud.newSpan("llm_call", name);
+ if (model != null) span.model(model);
+ if (captureIo()) {
+ Map p = new LinkedHashMap<>();
+ p.put("messages", rc.request().messages());
+ span.payload(p);
+ }
+ rc.attributes().put(SCOPE_KEY, span);
+ } catch (Throwable t) {
+ LOG.warn("JamjetChatModelListener.onRequest failed", t);
+ }
+ }
+
+ @Override
+ public void onResponse(ChatModelResponseContext rc) {
+ Span span = (Span) rc.attributes().get(SCOPE_KEY);
+ if (span == null) return;
+ try {
+ var usage = rc.response().tokenUsage();
+ if (usage != null) {
+ if (usage.inputTokenCount() != null) span.inputTokens(usage.inputTokenCount());
+ if (usage.outputTokenCount() != null) span.outputTokens(usage.outputTokenCount());
+ }
+ if (captureIo()) {
+ @SuppressWarnings("unchecked")
+ Map p = (Map) span.payload();
+ if (p == null) {
+ p = new LinkedHashMap<>();
+ span.payload(p);
+ }
+ if (rc.response().aiMessage() != null) {
+ p.put("response", rc.response().aiMessage().text());
+ }
+ }
+ span.finish("ok");
+ } catch (Throwable t) {
+ LOG.warn("JamjetChatModelListener.onResponse failed", t);
+ try { span.finish("error"); } catch (Throwable ignored) {}
+ }
+ }
+
+ @Override
+ public void onError(ChatModelErrorContext rc) {
+ Span span = (Span) rc.attributes().get(SCOPE_KEY);
+ if (span == null) return;
+ try {
+ span.payload(null);
+ span.fail(FailureModeClassifier.classify(rc.error()));
+ } catch (Throwable t) {
+ LOG.warn("JamjetChatModelListener.onError failed", t);
+ try { span.finish("error"); } catch (Throwable ignored) {}
+ }
+ }
+
+ private static boolean captureIo() {
+ JamjetCloudConfig cfg = JamjetCloud.config();
+ return cfg != null && cfg.captureIo();
+ }
+}
diff --git a/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/instrumentation/spring/JamjetObservationHandler.java b/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/instrumentation/spring/JamjetObservationHandler.java
new file mode 100644
index 0000000..45a52b2
--- /dev/null
+++ b/jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/instrumentation/spring/JamjetObservationHandler.java
@@ -0,0 +1,86 @@
+package dev.jamjet.cloud.instrumentation.spring;
+
+import dev.jamjet.cloud.FailureModeClassifier;
+import dev.jamjet.cloud.JamjetCloud;
+import dev.jamjet.cloud.Span;
+import io.micrometer.common.KeyValue;
+import io.micrometer.observation.Observation;
+import io.micrometer.observation.ObservationHandler;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Bridges Spring AI Micrometer observations to the JamJet Cloud event stream.
+ *
+ *