feat: Gemini CLI OAuth with Cloud Code API

FEATURE_PARITY.md

@@ -3,6 +3,7 @@
 This document tracks feature parity between IronClaw (Rust implementation) and OpenClaw (TypeScript reference implementation). Use this to coordinate work across developers.
 
 **Legend:**
+
 - ✅ Implemented
 - 🚧 Partial (in progress or incomplete)
 - ❌ Not implemented
@@ -183,7 +184,7 @@ This document tracks feature parity between IronClaw (Rust implementation) and O
 | Skills (modular capabilities) | ✅ | ✅ | Prompt-based skills with trust gating, attenuation, activation criteria, catalog, selector |
 | Skill routing blocks | ✅ | 🚧 | ActivationCriteria (keywords, patterns, tags) but no "Use when / Don't use when" blocks |
 | Skill path compaction | ✅ | ❌ | ~ prefix to reduce prompt tokens |
-| Thinking modes (low/med/high) | ✅ | ❌ | Configurable reasoning depth |
+| Thinking modes (low/med/high) | ✅ | 🚧 | thinkingConfig for Gemini models (includeThoughts); no per-level control yet |
 | Per-model thinkingDefault override | ✅ | ❌ | Override thinking level per model |
 | Block-level streaming | ✅ | ❌ | |
 | Tool-level streaming | ✅ | ❌ | |
@@ -216,7 +217,7 @@ This document tracks feature parity between IronClaw (Rust implementation) and O
 | Anthropic (Claude) | ✅ | 🚧 | - | Via NEAR AI proxy; Opus 4.5, Sonnet 4, Sonnet 4.6 |
 | OpenAI | ✅ | 🚧 | - | Via NEAR AI proxy |
 | AWS Bedrock | ✅ | ✅ | - | Native Converse API via aws-sdk-bedrockruntime (requires `--features bedrock`) |
-| Google Gemini | ✅ | ✅ | P3 | Via `gemini` adapter |
+| Google Gemini | ✅ | ✅ | - | OAuth (PKCE + S256), function calling, thinkingConfig, generationConfig |
 | io.net | ✅ | ✅ | P3 | Via `ionet` adapter |
 | Mistral | ✅ | ✅ | P3 | Via `mistral` adapter |
 | Yandex AI Studio | ✅ | ✅ | P3 | Via `yandex` adapter |
@@ -457,7 +458,7 @@ This document tracks feature parity between IronClaw (Rust implementation) and O
 | Device pairing | ✅ | ❌ | |
 | Tailscale identity | ✅ | ❌ | |
 | Trusted-proxy auth | ✅ | ❌ | Header-based reverse proxy auth |
-| OAuth flows | ✅ | 🚧 | NEAR AI OAuth |
+| OAuth flows | ✅ | 🚧 | NEAR AI OAuth + Gemini OAuth (PKCE, S256, loopback redirect, offline access) |
 | DM pairing verification | ✅ | ✅ | ironclaw pairing approve, host APIs |
 | Allowlist/blocklist | ✅ | 🚧 | allow_from + pairing store |
 | Per-group tool policies | ✅ | ❌ | |
@@ -514,6 +515,7 @@ This document tracks feature parity between IronClaw (Rust implementation) and O
 ## Implementation Priorities
 
 ### P0 - Core (Already Done)
+
 - ✅ TUI channel with approval overlays
 - ✅ HTTP webhook channel
 - ✅ DM pairing (ironclaw pairing list/approve, host APIs)
@@ -541,13 +543,15 @@ This document tracks feature parity between IronClaw (Rust implementation) and O
 - ✅ OpenAI-compatible / OpenRouter provider support
 
 ### P1 - High Priority
+
 - ❌ Slack channel (real implementation)
 - ✅ Telegram channel (WASM, DM pairing, caption, /start)
 - ❌ WhatsApp channel
 - ✅ Multi-provider failover (`FailoverProvider` with retryable error classification)
 - ✅ Hooks system (core lifecycle hooks + bundled/plugin/workspace hooks + outbound webhooks)
 
 ### P2 - Medium Priority
+
 - ❌ Media handling (images, PDFs)
 - ✅ Ollama/local model support (via rig::providers::ollama)
 - ❌ Configuration hot-reload
@@ -556,6 +560,7 @@ This document tracks feature parity between IronClaw (Rust implementation) and O
 - ❌ Partial output preservation on abort
 
 ### P3 - Lower Priority
+
 - ❌ Discord channel
 - ❌ Matrix channel
 - ❌ Other messaging platforms

docs/LLM_PROVIDERS.md

@@ -1,8 +1,8 @@
 # LLM Provider Configuration
 
 IronClaw defaults to NEAR AI for model access, but supports any OpenAI-compatible
-endpoint as well as Anthropic and Ollama directly. This guide covers the most common
-configurations.
+endpoint as well as Anthropic, Ollama, and Google Gemini directly. This guide covers
+the most common configurations.
 
 ## Provider Overview
 
@@ -11,7 +11,7 @@ configurations.
 | NEAR AI | `nearai` | OAuth (browser) | Default; multi-model |
 | Anthropic | `anthropic` | `ANTHROPIC_API_KEY` | Claude models |
 | OpenAI | `openai` | `OPENAI_API_KEY` | GPT models |
-| Google Gemini | `gemini` | `GEMINI_API_KEY` | Gemini models |
+| Google Gemini | `gemini_oauth` | OAuth (browser) | Gemini models; function calling |
 | io.net | `ionet` | `IONET_API_KEY` | Intelligence API |
 | Mistral | `mistral` | `MISTRAL_API_KEY` | Mistral models |
 | Yandex AI Studio | `yandex` | `YANDEX_API_KEY` | YandexGPT models |
@@ -60,6 +60,47 @@ Popular models: `gpt-4o`, `gpt-4o-mini`, `o3-mini`
 
 ---
 
+## Google Gemini (OAuth)
+
+Uses Google OAuth with PKCE (S256) for authentication — no API key required.
+On first run, a browser opens for Google account login. Credentials (including
+refresh token) are saved to `~/.gemini/oauth_creds.json` with `0600` permissions.
+
+```env
+LLM_BACKEND=gemini_oauth
+GEMINI_MODEL=gemini-2.5-flash
+```
+
+### Supported features
+
+| Feature | Status | Notes |
+|---|---|---|
+| Function calling | ✅ | `functionDeclarations` / `functionCall` / `functionResponse` |
+| `generationConfig` | ✅ | `temperature`, `maxOutputTokens` passed from request |
+| `thinkingConfig` | ✅ | `includeThoughts: true` for `gemini-3`/`thinking` models |
+| `toolConfig` | ✅ | `functionCallingConfig.mode`: `AUTO`/`ANY`/`NONE` |
+| SSE streaming | ✅ | Cloud Code API with `streamGenerateContent?alt=sse` |
+| Token refresh | ✅ | Automatic via refresh token |
+
+### Popular models
+
+| Model | ID | Notes |
+|---|---|---|
+| Gemini 3.1 Pro | `gemini-3.1-pro-preview` | Latest, strongest reasoning |
+| Gemini 3 Flash | `gemini-3-flash-preview` | Fast preview with thinking |
+| Gemini 2.5 Pro | `gemini-2.5-pro` | Stable, strong reasoning |
+| Gemini 2.5 Flash | `gemini-2.5-flash` | Fast, good quality |
+| Gemini 2.5 Flash Lite | `gemini-2.5-flash-lite` | Fastest, lightweight |
+
+### Cloud Code API vs standard API
+
+Models containing `preview` or `gemini-3` in the name route through the
+Cloud Code API (`cloudcode-pa.googleapis.com`) which supports SSE streaming
+and project-scoped access. Other models use the standard Generative Language
+API (`generativelanguage.googleapis.com`).
+
+---
+
 ## Ollama (local)
 
 Install Ollama from [ollama.com](https://ollama.com), pull a model, then:

src/config/llm.rs

@@ -118,12 +118,28 @@ pub struct LlmConfig {
     pub provider: Option<RegistryProviderConfig>,
     /// AWS Bedrock config (populated when backend=bedrock, requires --features bedrock).
     pub bedrock: Option<BedrockConfig>,
+    /// Gemini OAuth config (populated when backend=gemini_oauth)
+    pub gemini_oauth: Option<GeminiOauthConfig>,
     /// HTTP request timeout in seconds for LLM API calls.
-    /// Default: 120. Increase for local LLMs (Ollama, vLLM, LM Studio) that
-    /// need more time for prompt evaluation on consumer hardware.
     pub request_timeout_secs: u64,
 }
 
+/// Configuration for Gemini OAuth integration.
+#[derive(Debug, Clone)]
+pub struct GeminiOauthConfig {
+    pub model: String,
+    pub credentials_path: PathBuf,
+}
+
+impl GeminiOauthConfig {
+    pub fn default_credentials_path() -> PathBuf {
+        dirs::home_dir()
+            .unwrap_or_else(|| PathBuf::from("."))
+            .join(".gemini")
+            .join("oauth_creds.json")
+    }
+}
+
 /// NEAR AI configuration.
 #[derive(Debug, Clone)]
 pub struct NearAiConfig {
@@ -185,6 +201,7 @@ impl LlmConfig {
             },
             provider: None,
             bedrock: None,
+            gemini_oauth: None,
             request_timeout_secs: 120,
         }
     }
@@ -316,6 +333,19 @@ impl LlmConfig {
 
         let request_timeout_secs = parse_optional_env("LLM_REQUEST_TIMEOUT_SECS", 120)?;
 
+        let gemini_oauth = if backend_lower == "gemini_oauth" || backend_lower == "gemini-oauth" {
+            let model = Self::resolve_model("GEMINI_MODEL", settings, "gemini-2.5-flash")?;
+            let credentials_path = optional_env("GEMINI_CREDENTIALS_PATH")?
+                .map(PathBuf::from)
+                .unwrap_or_else(GeminiOauthConfig::default_credentials_path);
+            Some(GeminiOauthConfig {
+                model,
+                credentials_path,
+            })
+        } else {
+            None
+        };
+
         Ok(Self {
             backend: if is_nearai {
                 "nearai".to_string()
@@ -330,6 +360,7 @@ impl LlmConfig {
             nearai,
             provider,
             bedrock,
+            gemini_oauth,
             request_timeout_secs,
         })
     }

src/config/mod.rs

@@ -38,7 +38,8 @@ pub use self::embeddings::EmbeddingsConfig;
 pub use self::heartbeat::HeartbeatConfig;
 pub use self::hygiene::HygieneConfig;
 pub use self::llm::{
-    BedrockConfig, CacheRetention, LlmConfig, NearAiConfig, RegistryProviderConfig,
+    BedrockConfig, CacheRetention, GeminiOauthConfig, LlmConfig, NearAiConfig,
+    RegistryProviderConfig,
 };
 pub use self::routines::RoutineConfig;
 pub use self::safety::SafetyConfig;