feat: add Atomic Chat as declarative OpenAI-compatible provider

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
+}

documentation/docs/getting-started/providers.md

@@ -25,6 +25,7 @@ goose is compatible with a wide range of LLM providers, allowing you to choose a
 | [Amazon Bedrock](https://aws.amazon.com/bedrock/)                           | Offers a variety of foundation models, including Claude, Jurassic-2, and others. **AWS environment variables must be set in advance, not configured through `goose configure`**                                           | Credential auth: `AWS_PROFILE`, or `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`, `AWS_REGION`<br /><br />Bearer token auth: `AWS_BEARER_TOKEN_BEDROCK` and `AWS_REGION`, `AWS_DEFAULT_REGION`, or `AWS_PROFILE` |
 | [Amazon SageMaker TGI](https://docs.aws.amazon.com/sagemaker/latest/dg/realtime-endpoints.html) | Run Text Generation Inference models through Amazon SageMaker endpoints. **AWS credentials must be configured in advance.** | `SAGEMAKER_ENDPOINT_NAME`, `AWS_REGION` (optional), `AWS_PROFILE` (optional)  |
 | [Anthropic](https://www.anthropic.com/)                                     | Offers Claude, an advanced AI model for natural language tasks.                                                                                                                                                           | `ANTHROPIC_API_KEY`, `ANTHROPIC_HOST` (optional)                                                                                                                                                                 |
+| [Atomic Chat](https://github.com/AtomicBot-ai/Atomic-Chat)                | Run local models with Atomic Chat's OpenAI-compatible server. **Because this provider runs locally, you must first [download a model](#local-llms).** | None required. Connects to local server at `localhost:1337` by default. |
 | [Avian](https://avian.io/)                                                   | Cost-effective inference API with DeepSeek, Kimi, GLM, and MiniMax models. OpenAI-compatible with streaming and function calling support.                                                                                  | `AVIAN_API_KEY`, `AVIAN_HOST` (optional)                                                                                                                                            |
 | [Azure OpenAI](https://learn.microsoft.com/en-us/azure/ai-services/openai/) | Access Azure-hosted OpenAI models, including GPT-4 and GPT-3.5. Supports both API key and Azure credential chain authentication.                                                                                          | `AZURE_OPENAI_ENDPOINT`, `AZURE_OPENAI_DEPLOYMENT_NAME`, `AZURE_OPENAI_API_KEY` (optional)                                                                                           |
 | [ChatGPT Codex](https://chatgpt.com/codex) | Access GPT-5 Codex models optimized for code generation and understanding. **Requires a ChatGPT Plus/Pro subscription.** | No manual key. Uses browser-based OAuth authentication for both CLI and Desktop. |
@@ -1210,6 +1211,55 @@ Here are some local providers we support:
     Make sure the model name you enter in goose matches the model identifier shown in LM Studio's server panel.
     :::
   </TabItem>
+  <TabItem value="atomic-chat" label="Atomic Chat">
+    [Atomic Chat](https://github.com/AtomicBot-ai/Atomic-Chat) lets you run open-source models locally with an OpenAI-compatible API server.
+
+    1. Download and install Atomic Chat from [atomic.chat](https://atomic.chat/) or [GitHub Releases](https://github.com/AtomicBot-ai/Atomic-Chat/releases).
+    2. Open Atomic Chat and download a model that supports tool calling (e.g., Qwen, Llama, or Mistral variants).
+    3. Start the local server in Atomic Chat. The server runs on `http://localhost:1337` by default
+
+    4. Configure goose to use Atomic Chat:
+
+    <Tabs groupId="interface">
+      <TabItem value="ui" label="goose Desktop" default>
+        1. Click the <PanelLeft className="inline" size={16} /> button in the top-left to open the sidebar.
+        2. Click the `Settings` button on the sidebar.
+        3. Click the `Models` tab.
+        4. Click `Configure providers`.
+        5. Choose `Atomic Chat` from the provider list and click `Configure`.
+        6. Click `Submit` (no API key is needed).
+        7. Select the model you have loaded in Atomic Chat.
+      </TabItem>
+      <TabItem value="cli" label="goose CLI">
+        1. Run:
+        ```sh
+        goose configure
+        ```
+        2. Select `Configure Providers` from the menu.
+        3. Choose `Atomic Chat` as the provider.
+        4. Enter the model name that matches the model loaded in Atomic Chat.
+
+        ```
+        ┌   goose-configure
+        │
+        ◇  What would you like to configure?
+        │  Configure Providers
+        │
+        ◇  Which model provider should we use?
+        │  Atomic Chat
+        │
+        ◇  Enter a model from that provider:
+        │  qwen2.5-7b-instruct
+        │
+        └  Configuration saved successfully
+        ```
+      </TabItem>
+    </Tabs>
+
+    :::tip Model Name
+    Make sure the model name you enter in goose matches the model identifier shown for your server in Atomic Chat. If the API listens on a different origin than `http://localhost:1337`, set `ATOMIC_CHAT_HOST` in goose to match (scheme, host, and port only).
+    :::
+  </TabItem>
   <TabItem value="docker" label="Docker Model Runner" default>
     1. [Get Docker](https://docs.docker.com/get-started/get-docker/)
     2. [Enable Docker Model Runner](https://docs.docker.com/ai/model-runner/#enable-dmr-in-docker-desktop)