feat(client): add listLLMProviders() — closes provider-listing parity gap

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- **`axonflow.listLLMProviders()`** + `listLLMProviders(String type, Boolean enabled)` — list configured LLM providers and their per-provider health snapshot. Calls `GET /api/v1/llm-providers`. New `LLMProvider` and `LLMProviderHealth` types in `com.getaxonflow.sdk.types`. Async variant `listLLMProvidersAsync()`. Closes the parity gap with the Python SDK's `list_providers()` and the Go SDK's `ListProviders()`.
+
 ## [6.1.0] - 2026-04-25 — Plugin Batch 1 explainability fields on MCP responses
 
 Minor release. Surfaces fields the AxonFlow agent has emitted since v7.1.0 (Plugin Batch 1) but the SDK didn't declare. Pure field-additions on existing methods — additive only, no breaking changes. The pre-existing constructors are preserved as source-compat overloads. Documented in OpenAPI via platform v7.4.3.

src/main/java/com/getaxonflow/sdk/AxonFlow.java

@@ -1743,6 +1743,59 @@ public CompletableFuture<RollbackPlanResponse> rollbackPlanAsync(
   // MCP Connectors
   // ========================================================================
 
+  /**
+   * Lists configured LLM providers and their per-provider health snapshot.
+   *
+   * <p>Calls {@code GET /api/v1/llm-providers}. Mirrors the Python SDK's {@code
+   * list_providers()}, the Go SDK's {@code ListProviders()}, and the TypeScript
+   * SDK's {@code listProviders()}.
+   *
+   * @return list of configured providers
+   */
+  public List<LLMProvider> listLLMProviders() {
+    return listLLMProviders(null, null);
+  }
+
+  /**
+   * Lists configured LLM providers, optionally filtered by type and/or enabled flag.
+   *
+   * @param type filter by provider type (e.g. {@code "openai"}, {@code "anthropic"}); null for no
+   *     filter
+   * @param enabled filter by the enabled boolean; null for no filter
+   * @return list of matching providers
+   */
+  public List<LLMProvider> listLLMProviders(String type, Boolean enabled) {
+    return retryExecutor.execute(
+        () -> {
+          StringBuilder path = new StringBuilder("/api/v1/llm-providers");
+          boolean hasQuery = false;
+          if (type != null && !type.isEmpty()) {
+            path.append('?').append("type=").append(type);
+            hasQuery = true;
+          }
+          if (enabled != null) {
+            path.append(hasQuery ? '&' : '?').append("enabled=").append(enabled);
+          }
+          Request httpRequest = buildOrchestratorRequest("GET", path.toString(), null);
+          try (Response response = httpClient.newCall(httpRequest).execute()) {
+            JsonNode node = parseResponseNode(response);
+            JsonNode providers = node.has("providers") ? node.get("providers") : node;
+            return objectMapper.convertValue(
+                providers, new TypeReference<List<LLMProvider>>() {});
+          }
+        },
+        "listLLMProviders");
+  }
+
+  /**
+   * Asynchronously lists configured LLM providers.
+   *
+   * @return a future containing the list of providers
+   */
+  public CompletableFuture<List<LLMProvider>> listLLMProvidersAsync() {
+    return CompletableFuture.supplyAsync(this::listLLMProviders, asyncExecutor);
+  }
+
   /**
    * Lists available MCP connectors.
    *

src/main/java/com/getaxonflow/sdk/types/LLMProvider.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2025 AxonFlow
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.getaxonflow.sdk.types;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * A registered LLM provider returned by {@code GET /api/v1/llm-providers}.
+ *
+ * <p>Mirrors {@code LLMProvider} in the Python and Go SDKs and the {@code LLMProvider}
+ * TypeScript interface.
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public final class LLMProvider {
+
+  private final String name;
+  private final String type;
+  private final boolean enabled;
+  private final int priority;
+  private final int weight;
+  private final boolean hasApiKey;
+  private final LLMProviderHealth health;
+
+  public LLMProvider(
+      @JsonProperty("name") String name,
+      @JsonProperty("type") String type,
+      @JsonProperty("enabled") boolean enabled,
+      @JsonProperty("priority") int priority,
+      @JsonProperty("weight") int weight,
+      @JsonProperty("has_api_key") boolean hasApiKey,
+      @JsonProperty("health") LLMProviderHealth health) {
+    this.name = name;
+    this.type = type;
+    this.enabled = enabled;
+    this.priority = priority;
+    this.weight = weight;
+    this.hasApiKey = hasApiKey;
+    this.health = health;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getType() {
+    return type;
+  }
+
+  public boolean isEnabled() {
+    return enabled;
+  }
+
+  public int getPriority() {
+    return priority;
+  }
+
+  public int getWeight() {
+    return weight;
+  }
+
+  @JsonProperty("has_api_key")
+  public boolean hasApiKey() {
+    return hasApiKey;
+  }
+
+  /** Health snapshot; may be null if the platform did not return a health probe. */
+  public LLMProviderHealth getHealth() {
+    return health;
+  }
+}

src/main/java/com/getaxonflow/sdk/types/LLMProviderHealth.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2025 AxonFlow
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.getaxonflow.sdk.types;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * Health snapshot for a registered LLM provider, returned inside an {@link
+ * LLMProvider} record from {@code GET /api/v1/llm-providers}.
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public final class LLMProviderHealth {
+
+  private final String status;
+  private final String message;
+  private final String lastChecked;
+
+  public LLMProviderHealth(
+      @JsonProperty("status") String status,
+      @JsonProperty("message") String message,
+      @JsonProperty("last_checked") String lastChecked) {
+    this.status = status;
+    this.message = message;
+    this.lastChecked = lastChecked;
+  }
+
+  /** Coarse health label: {@code "healthy"}, {@code "unhealthy"}, or {@code "unknown"}. */
+  public String getStatus() {
+    return status;
+  }
+
+  /** Optional human-readable detail (e.g. {@code "billing exceeded"}); may be null. */
+  public String getMessage() {
+    return message;
+  }
+
+  /** ISO 8601 timestamp of the last health probe; may be null. */
+  @JsonProperty("last_checked")
+  public String getLastChecked() {
+    return lastChecked;
+  }
+}

src/test/java/com/getaxonflow/sdk/AxonFlowTest.java

@@ -571,6 +571,81 @@ void orchestratorHealthCheckAsyncShouldReturnFuture(WireMockRuntimeInfo wmRuntim
     assertThat(health.isHealthy()).isTrue();
   }
 
+  // ========================================================================
+  // LLM Providers
+  // ========================================================================
+
+  @Test
+  @DisplayName("listLLMProviders should return providers with health snapshot")
+  void listLLMProvidersShouldReturnProvidersWithHealth() {
+    stubFor(
+        get(urlEqualTo("/api/v1/llm-providers"))
+            .willReturn(
+                aResponse()
+                    .withStatus(200)
+                    .withHeader("Content-Type", "application/json")
+                    .withBody(
+                        "{\"providers\":[" +
+                            "{\"name\":\"anthropic\",\"type\":\"anthropic\",\"enabled\":true,\"has_api_key\":true,\"health\":{\"status\":\"healthy\",\"message\":\"provider is operational\",\"last_checked\":\"2026-04-28T08:45:12Z\"}}," +
+                            "{\"name\":\"openai\",\"type\":\"openai\",\"enabled\":true,\"has_api_key\":true,\"health\":{\"status\":\"unhealthy\",\"message\":\"billing exceeded\"}}" +
+                            "]}")));
+
+    List<LLMProvider> providers = axonflow.listLLMProviders();
+
+    assertThat(providers).hasSize(2);
+    assertThat(providers.get(0).getName()).isEqualTo("anthropic");
+    assertThat(providers.get(0).getHealth().getStatus()).isEqualTo("healthy");
+    assertThat(providers.get(1).getName()).isEqualTo("openai");
+    assertThat(providers.get(1).getHealth().getStatus()).isEqualTo("unhealthy");
+    assertThat(providers.get(1).getHealth().getMessage()).isEqualTo("billing exceeded");
+  }
+
+  @Test
+  @DisplayName("listLLMProviders with type filter passes query string")
+  void listLLMProvidersWithTypeFilterPassesQueryString() {
+    stubFor(
+        get(urlEqualTo("/api/v1/llm-providers?type=anthropic"))
+            .willReturn(
+                aResponse()
+                    .withStatus(200)
+                    .withHeader("Content-Type", "application/json")
+                    .withBody("{\"providers\":[]}")));
+
+    List<LLMProvider> providers = axonflow.listLLMProviders("anthropic", null);
+    assertThat(providers).isEmpty();
+  }
+
+  @Test
+  @DisplayName("listLLMProviders with enabled filter passes query string")
+  void listLLMProvidersWithEnabledFilterPassesQueryString() {
+    stubFor(
+        get(urlEqualTo("/api/v1/llm-providers?enabled=false"))
+            .willReturn(
+                aResponse()
+                    .withStatus(200)
+                    .withHeader("Content-Type", "application/json")
+                    .withBody("{\"providers\":[]}")));
+
+    List<LLMProvider> providers = axonflow.listLLMProviders(null, false);
+    assertThat(providers).isEmpty();
+  }
+
+  @Test
+  @DisplayName("listLLMProvidersAsync returns a CompletableFuture")
+  void listLLMProvidersAsyncShouldReturnFuture() throws Exception {
+    stubFor(
+        get(urlEqualTo("/api/v1/llm-providers"))
+            .willReturn(
+                aResponse()
+                    .withStatus(200)
+                    .withHeader("Content-Type", "application/json")
+                    .withBody("{\"providers\":[]}")));
+
+    CompletableFuture<List<LLMProvider>> future = axonflow.listLLMProvidersAsync();
+    List<LLMProvider> providers = future.get();
+    assertThat(providers).isEmpty();
+  }
+
   // ========================================================================
   // MCP Connectors
   // ========================================================================