feat(agents): add gemini-3-pro and default to codex-max (closes #423)

code-rs/core/prompt_coder.md

@@ -50,7 +50,7 @@ agent {
     "task": "Implement JWT middleware (RS256) with key rotation and unit/integration tests. Preserve existing OAuth flows. Provide README usage snippet.",
     "context": "Service: services/api (Rust Axum). Secrets via env. CI: `cargo test --all`.",
     "files": ["services/api", "services/api/src", "services/api/Cargo.toml"],
-    "models": ["claude-sonnet-4.5","code-gpt-5.1-codex","gemini-2.5-pro"],
+    "models": ["claude-sonnet-4.5","code-gpt-5.1-codex-max","gemini-3-pro"],
     "output": "Middleware + passing tests + README snippet",
     "write": true // Allow changes - will launch every agent in a separate worktree
   }

code-rs/core/src/agent_defaults.rs

@@ -34,15 +34,16 @@ const CLOUD_GPT5_CODEX_WRITE: &[&str] = &[];
 /// CLI-name lookups.
 pub const DEFAULT_AGENT_NAMES: &[&str] = &[
     "code-gpt-5.1-codex-mini",
-    "code-gpt-5.1-codex",
+    "code-gpt-5.1-codex-max",
     "code-gpt-5.1",
     "claude-sonnet-4.5",
     "claude-opus-4.1",
     "claude-haiku-4.5",
+    "gemini-3-pro",
     "gemini-2.5-pro",
     "gemini-2.5-flash",
     "qwen-3-coder",
-    "cloud-gpt-5.1-codex",
+    "cloud-gpt-5.1-codex-max",
 ];
 
 #[derive(Debug, Clone)]
@@ -95,15 +96,15 @@ const AGENT_MODEL_SPECS: &[AgentModelSpec] = &[
         gating_env: None,
     },
     AgentModelSpec {
-        slug: "code-gpt-5.1-codex",
+        slug: "code-gpt-5.1-codex-max",
         family: "code",
         cli: "coder",
         read_only_args: CODE_GPT5_CODEX_READ_ONLY,
         write_args: CODE_GPT5_CODEX_WRITE,
-        model_args: &["--model", "gpt-5.1-codex"],
-        description: "Backup for complex coding tasks (along with claude-opus-4.1). Slower and more expensive, but slightly more capable if code-gpt-5.1-codex-mini did not succeed.",
+        model_args: &["--model", "gpt-5.1-codex-max"],
+        description: "Flagship coding agent. Use when you want maximum reasoning depth and fidelity; falls back to this when older code-gpt-5.1-codex is requested.",
         enabled_by_default: true,
-        aliases: &["code-gpt-5-codex", "coder", "code", "codex"],
+        aliases: &["code-gpt-5.1-codex", "code-gpt-5-codex", "coder", "code", "codex"],
         gating_env: None,
     },
     AgentModelSpec {
@@ -137,7 +138,7 @@ const AGENT_MODEL_SPECS: &[AgentModelSpec] = &[
         read_only_args: CLAUDE_OPUS_READ_ONLY,
         write_args: CLAUDE_OPUS_WRITE,
         model_args: &["--model", "opus"],
-        description: "Backup for complex coding tasks (along with code-gpt-5.1-codex). Slower and more expensive, but slightly more capable if claude-sonnet-4.5 did not succeed.",
+        description: "Backup for complex coding tasks (along with code-gpt-5.1-codex-max). Slower and more expensive, but slightly more capable if claude-sonnet-4.5 did not succeed.",
         enabled_by_default: true,
         aliases: &["claude-opus"],
         gating_env: None,
@@ -154,6 +155,18 @@ const AGENT_MODEL_SPECS: &[AgentModelSpec] = &[
         aliases: &["claude-haiku"],
         gating_env: None,
     },
+    AgentModelSpec {
+        slug: "gemini-3-pro",
+        family: "gemini",
+        cli: "gemini",
+        read_only_args: GEMINI_PRO_READ_ONLY,
+        write_args: GEMINI_PRO_WRITE,
+        model_args: &["--model", "gemini-3-pro-preview"],
+        description: "Gemini 3 Pro via the Gemini app CLI. Use for newest Gemini capabilities; mapped from the preview model name under the hood.",
+        enabled_by_default: true,
+        aliases: &["gemini-3-pro-preview", "gemini-3", "gemini3"],
+        gating_env: None,
+    },
     AgentModelSpec {
         slug: "gemini-2.5-pro",
         family: "gemini",
@@ -191,15 +204,15 @@ const AGENT_MODEL_SPECS: &[AgentModelSpec] = &[
         gating_env: None,
     },
     AgentModelSpec {
-        slug: "cloud-gpt-5.1-codex",
+        slug: "cloud-gpt-5.1-codex-max",
         family: "cloud",
         cli: "cloud",
         read_only_args: CLOUD_GPT5_CODEX_READ_ONLY,
         write_args: CLOUD_GPT5_CODEX_WRITE,
-        model_args: &["--model", "gpt-5.1-codex"],
-        description: "Cloud-hosted gpt-5.1-codex agent. Requires the CODE_ENABLE_CLOUD_AGENT_MODEL flag and carries the latency of a remote run.",
+        model_args: &["--model", "gpt-5.1-codex-max"],
+        description: "Cloud-hosted gpt-5.1-codex-max agent. Requires the CODE_ENABLE_CLOUD_AGENT_MODEL flag and carries the latency of a remote run.",
         enabled_by_default: false,
-        aliases: &["cloud-gpt-5-codex", "cloud"],
+        aliases: &["cloud-gpt-5.1-codex", "cloud-gpt-5-codex", "cloud"],
         gating_env: Some(CLOUD_MODEL_ENV_FLAG),
     },
 ];

code-rs/core/src/agent_tool.rs

@@ -1310,7 +1310,7 @@ pub fn create_agent_tool(allowed_models: &[String]) -> OpenAiTool {
                 },
             }),
                 description: Some(
-                    "Optional array of model names (e.g., ['claude-sonnet-4.5','code-gpt-5.1-codex','code-gpt-5.1-codex-mini','gemini-2.5-pro'])".to_string(),
+                    "Optional array of model names (e.g., ['claude-sonnet-4.5','code-gpt-5.1-codex-max','code-gpt-5.1-codex-mini','gemini-3-pro'])".to_string(),
                 ),
         },
     );

code-rs/core/src/config.rs

@@ -2426,7 +2426,7 @@ impl Config {
                 || agent.name.eq_ignore_ascii_case("cloud")
             {
                 tracing::warn!(
-                    "legacy agent name '{}' detected; update config to use model slugs (e.g., code-gpt-5.1-codex)",
+                    "legacy agent name '{}' detected; update config to use model slugs (e.g., code-gpt-5.1-codex-max)",
                     agent.name
                 );
             }
@@ -3879,8 +3879,9 @@ model_verbosity = "high"
             .map(|agent| agent.name.to_ascii_lowercase())
             .collect();
 
-        assert!(enabled_names.contains("code-gpt-5.1-codex"));
+        assert!(enabled_names.contains("code-gpt-5.1-codex-max"));
         assert!(enabled_names.contains("claude-sonnet-4.5"));
+        assert!(enabled_names.contains("gemini-3-pro"));
         assert!(enabled_names.contains("gemini-2.5-pro"));
         assert!(enabled_names.contains("qwen-3-coder"));
         Ok(())

code-rs/core/src/slash_commands.rs

@@ -242,7 +242,7 @@ mod tests {
         assert!(plan_prompt.contains("final, comprehensive plan"));
         // Default agents list should include non-Codex providers when no [[agents]] configured
         assert!(plan_prompt.contains("code-gpt-5.1"));
-        assert!(!plan_prompt.contains("cloud-gpt-5.1-codex"));
+        assert!(!plan_prompt.contains("cloud-gpt-5.1-codex-max"));
 
         // Test /solve command
         let result = handle_slash_command("/solve fix the bug in authentication", None);

code-rs/core/tests/gemini_model_args.rs

@@ -2,6 +2,9 @@ use code_core::agent_defaults::agent_model_spec;
 
 #[test]
 fn gemini_specs_use_long_model_flag() {
+    let latest = agent_model_spec("gemini-3-pro").expect("spec present");
+    assert_eq!(latest.model_args, ["--model", "gemini-3-pro-preview"]);
+
     let pro = agent_model_spec("gemini-2.5-pro").expect("spec present");
     assert_eq!(pro.model_args, ["--model", "gemini-2.5-pro"]);
 

code-rs/tui/src/chatwidget.rs

@@ -26058,7 +26058,7 @@ mod tests {
 
         chat.auto_on_assistant_final();
 
-        // With cloud-gpt-5.1-codex gated off, the review request is still queued but
+        // With cloud-gpt-5.1-codex-max gated off, the review request is still queued but
         // may be processed synchronously; ensure the review slot was populated.
         if chat.auto_state.awaiting_review() {
             // Review remains pending; nothing else to assert.