feat: add Atomic Chat as declarative OpenAI-compatible provider (#9210)

Co-authored-by: Yana Lyalyuk <yanalyalyuk@MacBook-Pro-Yana.local>
Co-authored-by: Cursor <cursoragent@cursor.com>

crates/goose/src/config/declarative_providers.rs

@@ -879,6 +879,44 @@ mod tests {
         assert_eq!(result, "https://from-env.com/path");
     }
 
+    #[test]
+    fn test_atomic_chat_json_deserializes() {
+        let json = include_str!("../providers/declarative/atomic_chat.json");
+        let config: DeclarativeProviderConfig =
+            serde_json::from_str(json).expect("atomic_chat.json should parse");
+        assert_eq!(config.name, "atomic_chat");
+        assert_eq!(config.display_name, "Atomic Chat");
+        assert_eq!(
+            config.description.as_deref(),
+            Some("Local models through Atomic Chat\u{2019}s OpenAI-compatible server")
+        );
+        assert!(matches!(config.engine, ProviderEngine::OpenAI));
+        assert_eq!(config.api_key_env, "");
+        assert!(!config.requires_auth);
+        assert!(config.skip_canonical_filtering);
+        assert_eq!(config.dynamic_models, Some(true));
+        assert_eq!(config.supports_streaming, Some(true));
+        assert_eq!(config.base_url, "${ATOMIC_CHAT_HOST}/v1/chat/completions");
+        assert!(config.models.is_empty());
+        assert!(config.model_doc_link.is_none());
+        assert!(config.setup_steps.is_empty());
+
+        let env_vars = config.env_vars.as_ref().expect("env_vars should be set");
+        assert_eq!(env_vars.len(), 1);
+        assert_eq!(env_vars[0].name, "ATOMIC_CHAT_HOST");
+        assert!(!env_vars[0].required);
+        assert!(!env_vars[0].secret);
+        assert_eq!(env_vars[0].primary, Some(true));
+        assert_eq!(
+            env_vars[0].default,
+            Some("http://localhost:1337".to_string())
+        );
+        assert_eq!(
+            env_vars[0].description.as_deref(),
+            Some("Base URL of the Atomic Chat server (default: http://localhost:1337)")
+        );
+    }
+
     #[test]
     fn test_routstr_json_deserializes() {
         let json = include_str!("../providers/declarative/routstr.json");

crates/goose/src/providers/catalog.rs

@@ -703,6 +703,28 @@ const SETUP_METADATA: &[CuratedSetupMetadata] = &[
             default_value: None,
         }],
     },
+    CuratedSetupMetadata {
+        provider_id: "atomic_chat",
+        category: ProviderSetupCategory::Model,
+        setup_method: ProviderSetupMethod::ConfigFields,
+        group: ProviderSetupGroup::Additional,
+        display_name: None,
+        description: None,
+        docs_url: Some("https://github.com/AtomicBot-ai/Atomic-Chat?tab=readme-ov-file#readme"),
+        aliases: &[],
+        native_connect_query: None,
+        binary_name: None,
+        setup_capabilities: setup_capabilities(false, false, false),
+        show_only_when_installed: false,
+        synthetic: false,
+        secret_field_default: None,
+        field_overrides: &[CuratedFieldMetadata {
+            key: "ATOMIC_CHAT_HOST",
+            label: "Host URL",
+            placeholder: Some("http://localhost:1337"),
+            default_value: Some("http://localhost:1337"),
+        }],
+    },
     CuratedSetupMetadata {
         provider_id: "nvidia",
         category: ProviderSetupCategory::Model,
@@ -1093,6 +1115,22 @@ mod tests {
                 .collect::<Vec<_>>(),
             ["DATABRICKS_HOST", "DATABRICKS_TOKEN"]
         );
+
+        let atomic_chat = entries
+            .iter()
+            .find(|entry| entry.provider_id == "atomic_chat")
+            .expect("setup catalog should include atomic_chat declarative provider");
+        assert_eq!(atomic_chat.setup_method, ProviderSetupMethod::ConfigFields);
+        let host_field = atomic_chat
+            .fields
+            .iter()
+            .find(|field| field.key == "ATOMIC_CHAT_HOST")
+            .expect("atomic_chat should expose ATOMIC_CHAT_HOST");
+        assert_eq!(host_field.label, "Host URL");
+        assert_eq!(
+            host_field.default_value.as_deref(),
+            Some("http://localhost:1337")
+        );
     }
 
     #[tokio::test]
@@ -1105,6 +1143,7 @@ mod tests {
 
         assert!(provider_ids.contains("claude-acp"));
         assert!(provider_ids.contains("codex-acp"));
+        assert!(provider_ids.contains("atomic_chat"));
         assert!(!provider_ids.contains("claude_code"));
         assert!(!provider_ids.contains("codex"));
         assert!(!provider_ids.contains("gemini_cli"));

crates/goose/src/providers/declarative/atomic_chat.json

@@ -0,0 +1,23 @@
+{
+  "name": "atomic_chat",
+  "engine": "openai",
+  "display_name": "Atomic Chat",
+  "description": "Local models through Atomic Chat\u2019s OpenAI-compatible server",
+  "api_key_env": "",
+  "base_url": "${ATOMIC_CHAT_HOST}/v1/chat/completions",
+  "env_vars": [
+    {
+      "name": "ATOMIC_CHAT_HOST",
+      "required": false,
+      "secret": false,
+      "primary": true,
+      "default": "http://localhost:1337",
+      "description": "Base URL of the Atomic Chat server (default: http://localhost:1337)"
+    }
+  ],
+  "dynamic_models": true,
+  "models": [],
+  "supports_streaming": true,
+  "requires_auth": false,
+  "skip_canonical_filtering": true
+}