chore(release): 1.20.1 [skip ci]

## [1.20.1](https://github.com/asepharyana/zesdex/compare/v1.20.0...v1.20.1) (2026-08-28)

### Bug Fixes

* **agent:** subagent patuhi tool-calling contract + truncation char-safe ([e982cbe](https://github.com/asepharyana/zesdex/commit/e982cbeb041baea9cd500e2a29862a7eca9e6e17))

CHANGELOG.md

@@ -1,3 +1,53 @@
+## [1.20.1](https://github.com/asepharyana/zesdex/compare/v1.20.0...v1.20.1) (2026-08-28)
+
+
+### Bug Fixes
+
+* **agent:** subagent patuhi tool-calling contract + truncation char-safe ([e982cbe](https://github.com/asepharyana/zesdex/commit/e982cbeb041baea9cd500e2a29862a7eca9e6e17))
+
+# [1.20.0](https://github.com/asepharyana/zesdex/compare/v1.19.6...v1.20.0) (2026-08-28)
+
+
+### Features
+
+* **agent:** subagent tool paralel + auto-load AGENTS.md + verify cek setelah edit ([21e3ccc](https://github.com/asepharyana/zesdex/commit/21e3ccc891ab886044a5f0a770db710769d1287b))
+
+## [1.19.6](https://github.com/asepharyana/zesdex/compare/v1.19.5...v1.19.6) (2026-08-27)
+
+
+### Performance Improvements
+
+* **agent:** eksekusi tool read-only paralel seperti Claude Code ([74b1ad4](https://github.com/asepharyana/zesdex/commit/74b1ad43020a11ca27e60e3a24de0db5d1ab37b4))
+
+## [1.19.5](https://github.com/asepharyana/zesdex/compare/v1.19.4...v1.19.5) (2026-08-27)
+
+
+### Bug Fixes
+
+* **api:** model Opus default pakai claude-opus-5 (bukan -4-8) ([b28a5fe](https://github.com/asepharyana/zesdex/commit/b28a5fe384fd45255a6b249c7febd3b4ffc0fd2f))
+* **api:** update zesdex packages to version 1.19.4 ([b46935c](https://github.com/asepharyana/zesdex/commit/b46935c606d4f68ea227c7db27e4c2aa9b4e373c))
+
+## [1.19.4](https://github.com/asepharyana/zesdex/compare/v1.19.3...v1.19.4) (2026-08-27)
+
+
+### Bug Fixes
+
+* **api:** model claude selalu pakai Opus dari settings.json, bukan deepseek ([9aca45c](https://github.com/asepharyana/zesdex/commit/9aca45cb65d6913d14fecc10d70c180934f69d74))
+
+## [1.19.3](https://github.com/asepharyana/zesdex/compare/v1.19.2...v1.19.3) (2026-08-27)
+
+
+### Bug Fixes
+
+* **api:** model Opus pakai URL + API custom dari ~/.claude/settings.json ([1f91b44](https://github.com/asepharyana/zesdex/commit/1f91b447080e7106201d77585edb7d38b74e34bb))
+
+## [1.19.2](https://github.com/asepharyana/zesdex/compare/v1.19.1...v1.19.2) (2026-08-27)
+
+
+### Performance Improvements
+
+* **agent:** stabilkan async & parallel — satu runtime, bounded concurrency, isolasi error ([6a98d52](https://github.com/asepharyana/zesdex/commit/6a98d52d54a69f78710d852a69dda3ac0a4ead31))
+
 ## [1.19.1](https://github.com/asepharyana/zesdex/compare/v1.19.0...v1.19.1) (2026-08-27)
 
 

Cargo.lock

@@ -4862,7 +4862,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-api"
-version = "1.18.4"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "argon2",
@@ -4885,11 +4885,12 @@ dependencies = [
 
 [[package]]
 name = "zesdex-application"
-version = "1.18.4"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "base64",
  "chrono",
+ "futures-util",
  "serde",
  "serde_json",
  "sha2 0.11.0",
@@ -4902,7 +4903,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-bootstrap"
-version = "1.18.4"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "chrono",
@@ -4919,7 +4920,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-daemon"
-version = "1.18.4"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "base64",
@@ -4943,7 +4944,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-domain"
-version = "1.18.4"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "base64",
@@ -4959,7 +4960,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-gateway"
-version = "1.18.4"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "axum",
@@ -4986,7 +4987,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-grpc"
-version = "1.18.4"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "axum",
@@ -5003,7 +5004,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-infrastructure"
-version = "1.18.4"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "argon2",
@@ -5051,7 +5052,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-tui"
-version = "1.18.4"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "base64",
@@ -5077,7 +5078,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-web"
-version = "1.18.4"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "axum",
@@ -5097,7 +5098,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-ws"
-version = "1.18.4"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "axum",

Cargo.toml

@@ -15,7 +15,7 @@ members = [
 ]
 
 [workspace.package]
-version = "1.19.1"
+version = "1.20.1"
 edition = "2021"
 authors = ["asepharyana <superaseph@gmail.com>"]
 

apps/application/Cargo.toml

@@ -16,6 +16,7 @@ uuid.workspace = true
 anyhow.workspace = true
 tracing.workspace = true
 tokio.workspace = true
+futures-util.workspace = true
 base64.workspace = true
 sha2.workspace = true
 url.workspace = true

apps/application/src/agent/mod.rs

@@ -11,6 +11,17 @@ pub trait ToolExecutor: Send + Sync {
         tool_name: &str,
         args: &serde_json::Value,
     ) -> impl Future<Output = Result<String>> + Send;
+
+    /// Whether a tool is *read-only* and therefore safe to run concurrently
+    /// with other read-only tools in the same assistant message.
+    ///
+    /// Defaults to `false` (sequential) so a caller that does not know the
+    /// tool surface stays conservative. Concrete executors that know their
+    /// tools override this — e.g. return `true` for `read`/`grep`/`glob`.
+    fn is_parallel_safe(&self, tool_name: &str) -> bool {
+        let _ = tool_name;
+        false
+    }
 }
 
 /// Service for running agent turns asynchronously.

apps/application/src/agent/turn_service.rs

@@ -5,7 +5,7 @@ use tracing::{debug, info, warn};
 
 use zesdex_domain::agent::{AgentTurnParams, TurnEvent};
 use zesdex_domain::core::{ChatMessage, StreamEvent, ToolDef};
-use zesdex_domain::main_agent_prompt;
+use zesdex_domain::main_agent_prompt_with_project_context;
 
 use super::ToolExecutor;
 use crate::ports::ProviderService;
@@ -111,6 +111,46 @@ fn conversation_chars(messages: &[ChatMessage]) -> usize {
         .sum()
 }
 
+/// The maximum combined size (characters) of project-rule files injected into
+/// the system prompt, so a huge AGENTS.md cannot blow the context window.
+const PROJECT_CONTEXT_MAX_CHARS: usize = 12_000;
+
+/// Case-insensitive rule filenames auto-loaded from the workspace root into
+/// the system prompt, matching the Claude-Code/AGENTS.md convention.
+const RULE_FILENAMES: [&str; 6] = [
+    "AGENTS.md",
+    "agent.md",
+    "CLAUDE.md",
+    "claude.md",
+    ".cursorrules",
+    ".zesdexrules",
+];
+
+/// Build a compact "project context" block from the repo's convention files
+/// (AGENTS.md, CLAUDE.md, .cursorrules, …) found at the workspace root.
+///
+/// Follows the Claude-Code convention of loading AGENTS.md at startup so the
+/// model starts each turn with the repo's rules. Reads are best-effort and
+/// capped at [`PROJECT_CONTEXT_MAX_CHARS`] total; missing files are skipped.
+fn build_project_context(root: &std::path::Path) -> String {
+    let mut ctx = String::new();
+    for file in RULE_FILENAMES {
+        let full = root.join(file);
+        if let Ok(content) = std::fs::read_to_string(&full) {
+            ctx.push_str(&format!("\n### {file}\n```\n{}\n```", content.trim()));
+        }
+    }
+    let context = ctx.trim().to_string();
+    if context.len() <= PROJECT_CONTEXT_MAX_CHARS {
+        return context;
+    }
+    context
+        .chars()
+        .take(PROJECT_CONTEXT_MAX_CHARS)
+        .collect::<String>()
+        + "\n...[project context truncated]"
+}
+
 /// Track repeated tool-call errors so the loop can recover instead of
 /// burning iterations retrying the same failing tool.
 #[derive(Default)]
@@ -187,6 +227,53 @@ async fn execute_tool_call<T: ToolExecutor>(
     output
 }
 
+// ---------------------------------------------------------------------------
+// Helper: bounded-parallel execution of read-only tool calls.
+// ---------------------------------------------------------------------------
+
+/// Maximum number of read-only tool calls executed concurrently in a single
+/// assistant batch. Models rarely emit more than a handful of reads per
+/// message; this cap keeps resource usage bounded while still removing the
+/// serial round-trip latency of many independent lookups.
+const MAX_PARALLEL_TOOLS: usize = 8;
+
+fn tool_executor_ref<T: ToolExecutor>(tool_executor: &T) -> &T {
+    tool_executor
+}
+
+/// Execute a batch of *read-only* tool calls concurrently (bounded by
+/// [`MAX_PARALLEL_TOOLS`]) and return their outputs **in the original call
+/// order**.
+///
+/// Order preservation matters: OpenAI/Anthropic tool-calling contracts expect
+/// tool-result messages to appear in the same order as the `tool_calls`
+/// emitted in the assistant message. Without it, the model sees shuffled
+/// results and loses track of which result belongs to which call.
+///
+/// Each call still pushes its `TurnEvent::ToolResult` (so the TUI shows each
+/// tool as it completes) but the returned `Vec` is ordered by the input index.
+async fn execute_tool_calls_in_parallel<T: ToolExecutor>(
+    tool_executor: &T,
+    turn_events: &Arc<Mutex<VecDeque<TurnEvent>>>,
+    tool_calls: &[zesdex_domain::core::ToolCall],
+) -> Vec<String> {
+    let semaphore = Arc::new(tokio::sync::Semaphore::new(MAX_PARALLEL_TOOLS));
+    let executor_ref = tool_executor_ref(tool_executor);
+
+    let futures = tool_calls.iter().map(|tc| {
+        let tc = tc.clone();
+        let events = turn_events.clone();
+        let sem = semaphore.clone();
+        async move {
+            // Acquire a permit to bound concurrency across the batch.
+            let _permit = sem.acquire_owned().await;
+            execute_tool_call(executor_ref, &events, &tc).await
+        }
+    });
+
+    futures_util::future::join_all(futures).await
+}
+
 // ---------------------------------------------------------------------------
 // Helper: emit usage event from optional LLM response metadata.
 // ---------------------------------------------------------------------------
@@ -294,9 +381,17 @@ impl<P: ProviderService, T: ToolExecutor> super::AgentTurnService for AgentTurnS
 
         // Insert system prompt at position 0 once and keep it there for the
         // entire turn, avoiding per-iteration clones of the full message list.
+        // Auto-load repo conventions (AGENTS.md / CLAUDE.md / .cursorrules)
+        // from the first workspace root, like Claude Code does at startup.
+        let project_context = params
+            .workspace_roots
+            .first()
+            .map(|root| build_project_context(root))
+            .unwrap_or_default();
+        let system_prompt = main_agent_prompt_with_project_context(&project_context);
         params
             .messages
-            .insert(0, ChatMessage::system(main_agent_prompt()));
+            .insert(0, ChatMessage::system(system_prompt));
         let original_count = params.messages.len();
 
         // Estimate request complexity from the last user message.
@@ -384,10 +479,42 @@ impl<P: ProviderService, T: ToolExecutor> super::AgentTurnService for AgentTurnS
                     params.messages.push(assistant_msg);
 
                     // ── Execute each tool call ──────────────────────────
-                    for tc in &tool_calls {
+                    //
-                        let output =
+                    // If the whole batch is made of *read-only* tools
-                            execute_tool_call(self.tool_executor.as_ref(), &params.turn_events, tc)
+                    // (read/grep/glob/…), run it concurrently with bounded
-                                .await;
+                    // parallelism — a big latency win for coding turns that
+                    // emit several independent lookups in one message. Any
+                    // single mutating tool forces the whole batch back to the
+                    // safe sequential path so writes never race.
+                    //
+                    // Results are always collected in the original call order
+                    // to honour the tool-calling contract.
+                    let parallel = tool_calls.len() > 1
+                        && tool_calls
+                            .iter()
+                            .all(|tc| self.tool_executor.is_parallel_safe(&tc.function.name));
+                    let outputs: Vec<String> = if parallel {
+                        execute_tool_calls_in_parallel(
+                            self.tool_executor.as_ref(),
+                            &params.turn_events,
+                            &tool_calls,
+                        )
+                        .await
+                    } else {
+                        let mut sequential = Vec::with_capacity(tool_calls.len());
+                        for tc in &tool_calls {
+                            let out = execute_tool_call(
+                                self.tool_executor.as_ref(),
+                                &params.turn_events,
+                                tc,
+                            )
+                            .await;
+                            sequential.push(out);
+                        }
+                        sequential
+                    };
+
+                    for (tc, output) in tool_calls.iter().zip(outputs) {
                         if output.starts_with("Error:") {
                             errors.record(&tc.function.name, &output, &mut params.messages);
                         }
@@ -479,7 +606,6 @@ pub async fn compact_messages_with_ai<P: ProviderService>(
 #[cfg(test)]
 mod tests {
     use super::*;
-
     #[test]
     fn truncate_short_output_is_unchanged() {
         let out = "short".to_string();
@@ -536,4 +662,83 @@ mod tests {
         ];
         assert_eq!(conversation_chars(&messages), 3 + 11 + 6);
     }
+
+    /// A fake executor that reports parallel-safety for read-only tools and
+    /// whose `execute` sleeps on the first call to prove the batch runs
+    /// concurrently (a sequential loop would pay the sleep per call).
+    struct FakeExecutor;
+
+    impl ToolExecutor for FakeExecutor {
+        async fn execute(&self, name: &str, _args: &serde_json::Value) -> anyhow::Result<String> {
+            if name == "read" {
+                // 30ms sleep on every read; a parallel batch of 3 would
+                // finish in ~30ms instead of ~90ms sequentially.
+                tokio::time::sleep(std::time::Duration::from_millis(30)).await;
+            }
+            Ok(format!("out:{name}"))
+        }
+
+        fn is_parallel_safe(&self, name: &str) -> bool {
+            matches!(name, "read" | "grep")
+        }
+    }
+
+    fn tc(name: &str, id: usize) -> zesdex_domain::core::ToolCall {
+        zesdex_domain::core::ToolCall {
+            id: format!("call_{id}"),
+            type_: "function".to_string(),
+            function: zesdex_domain::core::ToolFunction {
+                name: name.to_string(),
+                arguments: serde_json::Value::String(String::new()),
+            },
+        }
+    }
+
+    #[test]
+    fn parallel_batch_runs_concurrently_and_preserves_order() {
+        let executor = FakeExecutor;
+        let events = Arc::new(Mutex::new(VecDeque::new()));
+        let calls = vec![tc("read", 1), tc("grep", 2), tc("read", 3)];
+
+        // All three are parallel-safe.
+        assert!(calls
+            .iter()
+            .all(|c| executor.is_parallel_safe(&c.function.name)));
+
+        let rt = tokio::runtime::Builder::new_multi_thread()
+            .enable_time()
+            .build()
+            .unwrap();
+        let started = std::time::Instant::now();
+        let outputs = rt.block_on(execute_tool_calls_in_parallel(&executor, &events, &calls));
+        let elapsed = started.elapsed();
+
+        // Results are in *original* call order (read, grep, read).
+        assert_eq!(
+            outputs,
+            vec![
+                "out:read".to_string(),
+                "out:grep".to_string(),
+                "out:read".to_string()
+            ]
+        );
+        // Two reads sleep 30ms each; sequential would take ~60ms+ for the
+        // two reads, parallel keeps the whole batch under 60ms.
+        assert!(
+            elapsed < std::time::Duration::from_millis(60),
+            "batch took {elapsed:?}, expected parallel execution"
+        );
+        assert!(elapsed >= std::time::Duration::from_millis(25));
+    }
+
+    #[test]
+    fn mutating_batch_falls_back_to_sequential_path() {
+        // A batch containing a mutating tool is not eligible for the parallel
+        // path, so the main loop keeps results ordered and side-effects safe.
+        let executor = FakeExecutor;
+        let calls = [tc("read", 1), tc("edit", 2)];
+        assert!(!calls
+            .iter()
+            .all(|c| executor.is_parallel_safe(&c.function.name)));
+    }
 }

apps/domain/src/agent/prompt.rs

@@ -41,10 +41,43 @@ architectural plans and `todowrite` to maintain granular task checklists.
 4. TOOL EXECUTION: Execute individual tools (file edits, terminal commands) \
 within or guided by your workflows. If an error occurs, analyse and fix it.
 
+VERIFY AFTER EDIT (CLAUDE-CODE STYLE):
+- After modifying code (edit/write), run the repo's check command via `bash` \
+before ending the turn: `cargo check` / `cargo clippy` / `cargo test` for Rust, \
+or the equivalent lint/test (`bun run lint && bun run test`, `npm test`, etc.) \
+for other stacks. Pick the project's actual verify command (see PROJECT \
+CONTEXT / AGENTS.md when present).
+- If the check fails, fix the errors you can see and re-run; only end the turn \
+after the check passes or you cannot resolve a failure yourself (then report it \
+explicitly).
+- Do NOT claim code compiles or works without running a real check.
+
 Respond conversationally, concisely, and helpfully."
         .to_string()
 }
 
+/// Build the main-agent system prompt including an injected block of project
+/// context (AGENTS.md / CLAUDE.md / project rules).
+///
+/// Like Claude Code, which loads AGENTS.md at startup so the model starts with
+/// the repo's conventions, this wraps [`main_agent_prompt`] and appends a
+/// clearly-delimited `## PROJECT CONTEXT` section carrying the rules the user
+/// keeps next to their code. When `project_context` is empty the returned
+/// prompt is identical to [`main_agent_prompt`], so callers can fall back
+/// safely.
+pub fn main_agent_prompt_with_project_context(project_context: &str) -> String {
+    let base = main_agent_prompt();
+    let context = project_context.trim();
+    if context.is_empty() {
+        return base;
+    }
+    format!(
+        "{base}\n\n\
+## PROJECT CONTEXT (repo rules — follow these conventions)\n\
+{context}"
+    )
+}
+
 /// Build a subagent directive prompt.
 ///
 /// The directive is embedded in a system message that also communicates the
@@ -119,6 +152,25 @@ mod tests {
         assert!(prompt.contains("WORKFLOW FIRST"));
     }
 
+    #[test]
+    fn project_context_prompt_appends_context_and_keeps_base() {
+        let base = main_agent_prompt();
+        let with_ctx = main_agent_prompt_with_project_context("## AGENTS.md\nUse cargo clippy.");
+        assert!(with_ctx.contains("Zesdex"), "base prompt must be preserved");
+        assert!(with_ctx.contains("PROJECT CONTEXT"));
+        assert!(with_ctx.contains("Use cargo clippy."));
+        assert!(with_ctx.contains(&base));
+        // The base section should appear before the context section.
+        assert!(with_ctx.find("PROJECT CONTEXT").unwrap() > with_ctx.find("Zesdex").unwrap());
+    }
+
+    #[test]
+    fn empty_project_context_returns_base_prompt() {
+        let base = main_agent_prompt();
+        assert_eq!(main_agent_prompt_with_project_context(""), base);
+        assert_eq!(main_agent_prompt_with_project_context("   "), base);
+    }
+
     #[test]
     fn subagent_directive_includes_directive_text() {
         let prompt = subagent_directive("test directive", "/home", "/home/project");

apps/domain/src/cms/app_config.rs

@@ -80,7 +80,7 @@ impl Default for AppConfig {
     ///
     /// ## Defaults
     /// - Zen provider: `deepseek-v4-flash-free` model
-    /// - Router provider: `claude-opus-4-8` model
+    /// - Router provider: `claude-opus-5` model
     /// - Default role: "default" → zen / deepseek-v4-flash-free, temp 0.7
     /// - `default_context_window`: 256,000 tokens
     fn default() -> Self {
@@ -99,7 +99,7 @@ impl Default for AppConfig {
             ProviderConfig {
                 api_base: "https://9router.asepharyana.my.id/v1".to_string(),
                 api_key_env: Some("ROUTER_API_KEY".to_string()),
-                default_model: Some("claude-opus-4-8".to_string()),
+                default_model: Some("claude-opus-5".to_string()),
                 default_api_key: None,
             },
         );

apps/domain/src/cms/mod.rs

@@ -47,6 +47,7 @@ pub use repository::SettingsRepository;
 pub use service::ConversationService;
 pub use service::MemoryService;
 pub use service::SettingsService;
+pub use settings::resolve_effective_model;
 pub use settings::InternetMode;
 pub use settings::Settings;
 pub use settings::SettingsFlags;

apps/domain/src/cms/settings.rs

@@ -23,6 +23,8 @@ use std::collections::HashMap;
 
 use serde::{Deserialize, Serialize};
 
+use super::app_config::AppConfig;
+
 /// Controls how much network access the agent is permitted during a session.
 ///
 /// ## Variants
@@ -112,3 +114,86 @@ impl Default for Settings {
         }
     }
 }
+
+/// Pick the effective model name for the main agent.
+///
+/// When `settings.provider` is `"claude"` (auto-detected from
+/// `~/.claude/settings.json`), the provider's `default_model` (or the
+/// app-level `default_model`) wins over a possibly-stale persisted
+/// `settings.model`. Otherwise the user's explicit `settings.model` is used.
+///
+/// Why: the user's custom Claude endpoint (URL + API key from
+/// `~/.claude/settings.json`) implies Opus as the model; a stale
+/// `settings.json` (e.g. "deepseek-v4-flash-free") must not override it.
+pub fn resolve_effective_model(settings: &Settings, app_config: &AppConfig) -> String {
+    if settings.provider == "claude" {
+        if let Some(m) = app_config
+            .providers
+            .get("claude")
+            .and_then(|p| p.default_model.clone())
+        {
+            return m;
+        }
+        return app_config.default_model.clone();
+    }
+    settings.model.clone()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::cms::app_config::AppConfig;
+
+    fn claude_app_config() -> AppConfig {
+        let mut cfg = AppConfig::default();
+        cfg.providers.insert(
+            "claude".to_string(),
+            crate::cms::ProviderConfig {
+                api_base: "https://9router.example/v1".to_string(),
+                api_key_env: Some("ANTHROPIC_API_KEY".to_string()),
+                default_model: Some("claude-opus-5".to_string()),
+                default_api_key: Some("sk-test".to_string()),
+            },
+        );
+        cfg.default_provider = "claude".to_string();
+        cfg.default_model = "claude-opus-5".to_string();
+        cfg
+    }
+
+    #[test]
+    fn claude_provider_uses_opus_model_over_stale_settings_model() {
+        let settings = Settings {
+            provider: "claude".to_string(),
+            model: "deepseek-v4-flash-free".to_string(), // stale persisted
+            ..Settings::default()
+        };
+
+        let model = resolve_effective_model(&settings, &claude_app_config());
+        assert_eq!(model, "claude-opus-5");
+    }
+
+    #[test]
+    fn non_claude_provider_uses_settings_model() {
+        let settings = Settings {
+            provider: "zen".to_string(),
+            model: "my-model".to_string(),
+            ..Settings::default()
+        };
+
+        let model = resolve_effective_model(&settings, &AppConfig::default());
+        assert_eq!(model, "my-model");
+    }
+
+    #[test]
+    fn claude_falls_back_to_app_default() {
+        let settings = Settings {
+            provider: "claude".to_string(),
+            model: String::new(),
+            ..Settings::default()
+        };
+
+        let cfg = AppConfig::default();
+        let model = resolve_effective_model(&settings, &cfg);
+        assert_eq!(model, cfg.default_model);
+    }
+}

apps/domain/src/lib.rs

@@ -58,6 +58,9 @@ pub use agent::*;
 // Sub-module items need explicit re-exports
 pub use agent::defaults::*;
 pub use agent::progress::AgentProgress;
-pub use agent::prompt::{compaction_prompt, main_agent_prompt, subagent_directive};
+pub use agent::prompt::{
+    compaction_prompt, main_agent_prompt, main_agent_prompt_with_project_context,
+    subagent_directive,
+};
 pub use subagent::*;
 pub use workflow::*;

apps/infrastructure/src/best_practice/explore.rs

@@ -15,7 +15,7 @@
 //!    read of up to 3 relevant files).
 //! 4. Join the result and return a concise bullet summary as a tool message.
 
-use anyhow::{Context, Result};
+use anyhow::Result;
 use serde_json::{json, Value};
 use tracing::{info, warn};
 
@@ -118,7 +118,7 @@ impl Tool for ExploreCodebase {
             model,
         );
 
-        let rt = tokio::runtime::Runtime::new().context("create explore tokio runtime")?;
+        let rt = crate::runtime::runtime();
         let result = rt.block_on(run_agent(
             subagent_ctx,
             &directive,

apps/infrastructure/src/lib.rs

@@ -34,6 +34,7 @@ pub mod llm;
 pub mod mcp;
 pub mod middleware;
 pub mod persistence;
+pub mod runtime;
 pub mod subagent;
 pub mod tools;
 pub mod utils;

apps/infrastructure/src/persistence/cms/app_config_repo.rs

@@ -72,6 +72,55 @@ fn detect_claude_settings_provider() -> Option<(ProviderConfig, Option<String>)>
     ))
 }
 
+/// Apply a detected Claude provider + custom model onto an `AppConfig`.
+///
+/// Pure (no I/O) so it can be unit-tested. Flow:
+///   1. Always `insert`s the "claude" provider (refreshing a possibly stale
+///      persisted entry with the current base URL + key from settings.json).
+///   2. Registers known Claude model roles if missing.
+///   3. Always sets `default_provider = "claude"` and
+///      `default_model = custom_model.unwrap_or("claude-opus-5")` so Opus
+///      is the default whenever `~/.claude/settings.json` is present.
+fn apply_claude_provider(
+    cfg: &mut AppConfig,
+    claude_provider: ProviderConfig,
+    custom_model: Option<String>,
+) {
+    cfg.providers.insert("claude".to_string(), claude_provider);
+
+    let claude_models: [(&str, &str); 3] = [
+        ("claude-opus-5", "claude-opus-5"),
+        ("claude-sonnet-5", "claude-sonnet-5"),
+        ("claude-haiku-4-5", "claude-haiku-4-5-20251001"),
+    ];
+    for (role_name, model_name) in &claude_models {
+        cfg.model_roles
+            .entry(role_name.to_string())
+            .or_insert(ModelRole {
+                provider: "claude".to_string(),
+                model: model_name.to_string(),
+                max_tokens: Some(8192),
+                context_window: Some(200_000),
+                temperature: Some(0.7),
+            });
+    }
+
+    if let Some(custom) = &custom_model {
+        cfg.model_roles.entry(custom.clone()).or_insert(ModelRole {
+            provider: "claude".to_string(),
+            model: custom.clone(),
+            max_tokens: Some(8192),
+            context_window: Some(200_000),
+            temperature: Some(0.7),
+        });
+    }
+
+    // Always prefer the Claude provider + Opus model when settings.json
+    // is present — this is the user's explicit custom endpoint choice.
+    cfg.default_provider = "claude".to_string();
+    cfg.default_model = custom_model.unwrap_or_else(|| "claude-opus-5".to_string());
+}
+
 impl AppConfigRepository for JsonAppConfigRepository {
     fn load(&self, base_dir: &Path) -> Result<AppConfig, RepositoryError> {
         let path = base_dir.join("app_config.json");
@@ -87,41 +136,7 @@ impl AppConfigRepository for JsonAppConfigRepository {
         }
 
         if let Some((claude_provider, custom_model)) = detect_claude_settings_provider() {
-            cfg.providers
+            apply_claude_provider(&mut cfg, claude_provider, custom_model);
-                .entry("claude".to_string())
-                .or_insert(claude_provider);
-
-            let claude_models: [(&str, &str); 3] = [
-                ("claude-opus-4-8", "claude-opus-4-8"),
-                ("claude-sonnet-5", "claude-sonnet-5"),
-                ("claude-haiku-4-5", "claude-haiku-4-5-20251001"),
-            ];
-            for (role_name, model_name) in &claude_models {
-                cfg.model_roles
-                    .entry(role_name.to_string())
-                    .or_insert(ModelRole {
-                        provider: "claude".to_string(),
-                        model: model_name.to_string(),
-                        max_tokens: Some(8192),
-                        context_window: Some(200_000),
-                        temperature: Some(0.7),
-                    });
-            }
-
-            if let Some(custom) = &custom_model {
-                cfg.model_roles.entry(custom.clone()).or_insert(ModelRole {
-                    provider: "claude".to_string(),
-                    model: custom.clone(),
-                    max_tokens: Some(8192),
-                    context_window: Some(200_000),
-                    temperature: Some(0.7),
-                });
-            }
-
-            if cfg.default_provider == defaults.default_provider {
-                cfg.default_provider = "claude".to_string();
-                cfg.default_model = custom_model.unwrap_or_else(|| "claude-opus-4-8".to_string());
-            }
         }
 
         Ok(cfg)
@@ -134,3 +149,106 @@ impl AppConfigRepository for JsonAppConfigRepository {
         Ok(())
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::collections::HashMap;
+
+    fn claude_provider(base: &str, key: Option<&str>) -> ProviderConfig {
+        ProviderConfig {
+            api_base: base.to_string(),
+            api_key_env: Some("ANTHROPIC_API_KEY".to_string()),
+            default_model: Some("claude-opus-5".to_string()),
+            default_api_key: key.map(|s| s.to_string()),
+        }
+    }
+
+    #[test]
+    fn claude_settings_parse_env() {
+        let parsed: ClaudeSettings = serde_json::from_str(
+            r#"{"env":{"ANTHROPIC_BASE_URL":"https://9router.example/v1","ANTHROPIC_API_KEY":"sk-test"}}"#,
+        )
+        .unwrap();
+        let env = parsed.env.unwrap();
+        assert_eq!(
+            env.anthropic_base_url.as_deref(),
+            Some("https://9router.example/v1")
+        );
+        assert_eq!(env.anthropic_api_key.as_deref(), Some("sk-test"));
+    }
+
+    #[test]
+    fn apply_claude_refreshes_stale_provider_and_sets_opus_default() {
+        // Simulate a previously-persisted app_config.json with a STALE claude
+        // provider + non-opus default (e.g. user had switched provider).
+        let mut cfg = AppConfig {
+            providers: {
+                let mut m = HashMap::new();
+                m.insert(
+                    "claude".to_string(),
+                    claude_provider("https://old.example/v1", Some("sk-old")),
+                );
+                m
+            },
+            model_roles: HashMap::new(),
+            default_provider: "router".to_string(),
+            default_model: "other-model".to_string(),
+            default_context_window: 256_000,
+        };
+
+        // Detect returned a fresh provider from ~/.claude/settings.json.
+        apply_claude_provider(
+            &mut cfg,
+            claude_provider("https://9router.example/v1", Some("sk-new")),
+            None,
+        );
+
+        let claude = cfg.providers.get("claude").unwrap();
+        assert_eq!(claude.api_base, "https://9router.example/v1");
+        assert_eq!(claude.default_api_key.as_deref(), Some("sk-new"));
+        // Insert (not or_insert) → stale entry refreshed.
+        assert_eq!(cfg.default_provider, "claude");
+        assert_eq!(cfg.default_model, "claude-opus-5");
+
+        // Claude model roles registered.
+        assert!(cfg.model_roles.contains_key("claude-opus-5"));
+        assert!(cfg.model_roles.contains_key("claude-sonnet-5"));
+        assert!(cfg.model_roles.contains_key("claude-haiku-4-5"));
+    }
+
+    #[test]
+    fn apply_claude_honors_custom_model_from_settings() {
+        let mut cfg = AppConfig::default();
+        apply_claude_provider(
+            &mut cfg,
+            claude_provider("https://9router.example/v1", Some("sk-new")),
+            Some("claude-opus-5".to_string()),
+        );
+        assert_eq!(cfg.default_model, "claude-opus-5");
+        assert!(cfg.model_roles.contains_key("claude-opus-5"));
+    }
+
+    #[test]
+    fn detect_uses_env_creds_as_fallback() {
+        // When ~/.claude/settings.json is absent/unreadable, the env-var
+        // fallback should produce a "claude" provider. Set env vars, call
+        // detect, and assert the resulting provider uses them.
+        std::env::set_var("ANTHROPIC_BASE_URL", "https://env.example/v1");
+        std::env::set_var("ANTHROPIC_API_KEY", "sk-env");
+        match detect_claude_settings_provider() {
+            Some((provider, _custom)) => {
+                // If the real settings.json exists it wins (base could be the
+                // real 9router URL); otherwise env creds are used. Either way,
+                // the provider must have api_key_env pointing at ANTHROPIC_API_KEY.
+                assert_eq!(provider.api_key_env.as_deref(), Some("ANTHROPIC_API_KEY"));
+            }
+            None => {
+                // No file + no env (shouldn't happen since we just set env).
+                panic!("expected env fallback to produce a provider");
+            }
+        }
+        std::env::remove_var("ANTHROPIC_BASE_URL");
+        std::env::remove_var("ANTHROPIC_API_KEY");
+    }
+}

apps/infrastructure/src/runtime.rs

@@ -0,0 +1,62 @@
+//! Process-wide shared Tokio runtime for sync → async bridging.
+//!
+//! Many `Tool::run` implementations are synchronous but need to drive async
+//! work (LLM calls, subagent execution). Creating a fresh
+//! [`tokio::runtime::Runtime`] on every call is expensive (spawns a thread
+//! pool + runtime each time) and can fail randomly under thread pressure.
+//!
+//! # Flow
+//!
+//! [`runtime()`] returns a lazily-initialised process-wide runtime created
+//! exactly once via [`std::sync::OnceLock`]. Callers use
+//! `runtime().block_on(...)` exactly like they would with a local runtime —
+//! the only difference is the runtime is shared, so the cost is paid once per
+//! process instead of once per tool call.
+//!
+//! # Safety
+//!
+//! `block_on` panics if called from within a running Tokio runtime. The
+//! tools that use this helper are synchronous (`Tool::run`), so this is safe
+//! in practice. Async code should never call `runtime().block_on`.
+
+use std::sync::OnceLock;
+
+/// Maximum worker threads for the shared runtime. Kept modest — tools are
+/// mostly I/O-bound and rarely need more concurrency than this.
+const RUNTIME_WORKER_THREADS: usize = 8;
+
+static SHARED_RUNTIME: OnceLock<tokio::runtime::Runtime> = OnceLock::new();
+
+/// Return the process-wide shared Tokio runtime, initialising it on first use.
+///
+/// The runtime is configured with `worker_threads = 8` and
+/// `enable_all()` (time + IO drivers) so streams, timers, and network calls
+/// all work. If initialisation fails (extremely rare — resource exhaustion at
+/// startup), the process aborts with a clear message rather than returning
+/// an error on every subsequent call.
+pub fn runtime() -> &'static tokio::runtime::Runtime {
+    SHARED_RUNTIME.get_or_init(|| {
+        tokio::runtime::Builder::new_multi_thread()
+            .worker_threads(RUNTIME_WORKER_THREADS)
+            .thread_name("zesdex-shared-rt")
+            .enable_all()
+            .build()
+            .expect("failed to create shared tokio runtime")
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::runtime;
+
+    #[test]
+    fn runtime_is_singleton() {
+        assert!(std::ptr::eq(runtime(), runtime()));
+    }
+
+    #[test]
+    fn runtime_blocks_and_resolves() {
+        let val = runtime().block_on(async { 6 * 7 });
+        assert_eq!(val, 42);
+    }
+}

apps/infrastructure/src/subagent/auto/engine.rs

@@ -130,7 +130,7 @@ pub fn spawn_background_review(
             );
             format!(
                 "{}...\n[diff truncated at {} characters]",
-                &diff[..MAX_DIFF_CHARS],
+                crate::utils::truncate_chars(&diff, MAX_DIFF_CHARS),
                 MAX_DIFF_CHARS
             )
         } else {

apps/infrastructure/src/subagent/engine.rs

@@ -14,7 +14,8 @@ use tracing::{debug, info, instrument};
 use crate::llm::provider::LlmClient;
 use crate::subagent::context::SubagentContext;
 use crate::subagent::division::{tools_for, AccessTier};
-use crate::tools::{tool_defs, ToolCtx};
+use crate::tools::{tool_defs, Tool, ToolCtx};
+use serde_json::Value;
 use zesdex_domain::agent::progress::AgentProgress;
 use zesdex_domain::core::tool_call::sanitize_tool_arguments;
 use zesdex_domain::core::ChatMessage;
@@ -23,6 +24,126 @@ use zesdex_domain::subagent_directive;
 /// Maximum number of tool-call iterations before the engine gives up.
 const MAX_ITERATIONS: u32 = 25;
 
+/// A single tool-result message is truncated before entering the subagent's
+/// context so it cannot blow the window (matches the main turn service).
+const TOOL_OUTPUT_MAX_CHARS: usize = 12_000;
+
+/// Maximum consecutive identical tool errors before the engine injects a
+/// recovery note steering the model to a different approach.
+const MAX_CONSECUTIVE_TOOL_ERRORS: usize = 3;
+
+/// Maximum number of read-only tool calls executed concurrently in a single
+/// subagent batch. Read-only tools (read/grep/glob/…) block on disk I/O, so
+/// running them on parallel OS threads removes the serial round-trip latency
+/// for a batch of independent lookups, mirroring the main turn loop.
+const MAX_PARALLEL_TOOLS: usize = 8;
+
+/// Execute a batch of tool calls, running read-only tools concurrently when
+/// the whole batch is parallel-safe.
+///
+/// Returns one `(tool_call_id, tool_name, result)` per call **in the original
+/// call order** (OpenAI/Anthropic tool-result ordering contract). `Tool::run`
+/// is synchronous, so real parallelism comes from scoped OS threads; `Tool`
+/// and `ToolCtx` are `Send + Sync`, so the borrowed references can be shared
+/// across the short-lived scoped threads.
+///
+/// If any single tool in the batch mutates state (edit/write/bash/git/…), the
+/// whole batch falls back to the safe sequential path so writes never race.
+fn execute_tool_batch(
+    tools: &[Box<dyn Tool>],
+    tool_ctx: &ToolCtx,
+    tool_calls: &[zesdex_domain::core::ToolCall],
+) -> Vec<(String, String, String)> {
+    let parallel = tool_calls.len() > 1
+        && tool_calls
+            .iter()
+            .all(|tc| crate::tools::tool_is_parallel_safe(&tc.function.name));
+
+    if !parallel {
+        // Sequential fallback (kept identical to the historical behavior).
+        return tool_calls
+            .iter()
+            .map(|tc| {
+                let tool_name = tc.function.name.clone();
+                let args = sanitize_tool_arguments(&tc.function.arguments);
+                let result = run_one_tool(tools, tool_ctx, &tool_name, &args);
+                (tc.id.clone(), tool_name, result)
+            })
+            .collect();
+    }
+
+    // Bounded parallel path: process the batch in windows of
+    // `MAX_PARALLEL_TOOLS` so concurrency stays bounded, joining each window
+    // before the next so results stay in original order.
+    let mut ordered = Vec::with_capacity(tool_calls.len());
+    for window in tool_calls.chunks(MAX_PARALLEL_TOOLS) {
+        let window_results = std::thread::scope(|s| {
+            let handles: Vec<_> = window
+                .iter()
+                .map(|tc| {
+                    let tool_name = tc.function.name.clone();
+                    let args = sanitize_tool_arguments(&tc.function.arguments);
+                    s.spawn(move || {
+                        debug!("Subagent executing tool: {tool_name}");
+                        run_one_tool(tools, tool_ctx, &tool_name, &args)
+                    })
+                })
+                .collect();
+            handles
+                .into_iter()
+                .map(|h| {
+                    h.join()
+                        .unwrap_or_else(|_| "Error: tool panicked".to_string())
+                })
+                .collect::<Vec<_>>()
+        });
+        for (tc, result) in window.iter().zip(window_results) {
+            ordered.push((tc.id.clone(), tc.function.name.clone(), result));
+        }
+    }
+    ordered
+}
+
+/// Run a single synchronous tool call and capture its result string.
+fn run_one_tool(
+    tools: &[Box<dyn Tool>],
+    tool_ctx: &ToolCtx,
+    tool_name: &str,
+    args: &Value,
+) -> String {
+    if let Some(tool) = tools.iter().find(|t| t.name() == tool_name) {
+        match tool.run(tool_ctx, args) {
+            Ok(output) => output,
+            Err(e) => format!("Error: {e}"),
+        }
+    } else {
+        format!("Unknown tool: {tool_name}")
+    }
+}
+
+/// Pick a `max_tokens` budget proportional to the directive's length.
+fn adaptive_max_tokens(directive_len: usize) -> u32 {
+    if directive_len <= 80 {
+        800
+    } else if directive_len <= 400 {
+        1600
+    } else {
+        4096
+    }
+}
+
+fn truncate_tool_output(output: String) -> String {
+    if output.len() <= TOOL_OUTPUT_MAX_CHARS {
+        return output;
+    }
+    let mut result: String = output.chars().take(TOOL_OUTPUT_MAX_CHARS).collect();
+    result.push_str(&format!(
+        "\n...[truncated {} chars]",
+        output.len() - TOOL_OUTPUT_MAX_CHARS
+    ));
+    result
+}
+
 /// Emit an `AgentProgress` event onto the turn-event queue, if one is
 /// configured in the `ToolCtx`.
 fn report_progress(tool_ctx: &ToolCtx, progress: AgentProgress) {
@@ -85,15 +206,21 @@ pub async fn run_agent(
         Some(ctx.base_url.clone()),
     );
 
+    let max_tokens = adaptive_max_tokens(directive.len());
+
+    // Track repeated tool errors so the agent can recover from a dead end.
+    let mut consecutive_errors = 0usize;
+    let mut last_tool = String::new();
+
     // Limited iteration loop so we don't run forever
     for iteration in 0..MAX_ITERATIONS {
         use zesdex_application::ports::ProviderService;
         let (response_msg, _usage) = client
-            .chat(&messages, Some(defs.clone()), Some(4096), None)
+            .chat(&messages, Some(defs.clone()), Some(max_tokens), Some(0.2))
             .await?;
 
         let content = response_msg.content.clone().unwrap_or_default();
-        let tool_calls = response_msg.tool_calls.unwrap_or_default();
+        let tool_calls = response_msg.tool_calls.clone().unwrap_or_default();
 
         // If no tool calls, we're done — return content
         if tool_calls.is_empty() {
@@ -102,37 +229,48 @@ pub async fn run_agent(
             return Ok(content);
         }
 
-        // Execute tool calls
+        // Push the assistant message (with its tool_calls) BEFORE executing
-        for tc in &tool_calls {
+        // so the tool-calling contract is honoured: tool results reference
-            let tool_name = &tc.function.name;
+        // the calls declared in the preceding assistant message. Without
-            let args = sanitize_tool_arguments(&tc.function.arguments);
+        // this, the history is malformed (`[...tool, tool, assistant]`).
+        messages.push(response_msg);
 
-            debug!("Subagent executing tool: {tool_name}");
+        // Execute tool calls — read-only batches run concurrently (bounded,
+        // order preserved); any mutating tool forces the safe sequential path.
+        let results = execute_tool_batch(&tools, &tool_ctx, &tool_calls);
+
+        for (id, tool_name, result) in results {
+            debug!("Subagent tool {tool_name} finished");
 
             report_progress(
                 &tool_ctx,
                 AgentProgress::running(
                     "subagent",
-                    format!("{}:{}", directive, tool_name),
+                    format!("{}:{tool_name}", directive),
                     Some(tool_name.clone()),
                 ),
             );
 
-            let result = if let Some(tool) = tools.iter().find(|t| t.name() == tool_name) {
+            // Error-recovery: if the same tool keeps failing, inject a
-                match tool.run(&tool_ctx, &args) {
+            // system note steering the model to a different approach.
-                    Ok(output) => output,
+            if result.starts_with("Error:") {
-                    Err(e) => format!("Error: {e}"),
+                if last_tool.as_str() == tool_name.as_str() {
+                    consecutive_errors += 1;
+                } else {
+                    consecutive_errors = 1;
+                    last_tool = tool_name.clone();
+                }
+                if consecutive_errors >= MAX_CONSECUTIVE_TOOL_ERRORS {
+                    messages.push(ChatMessage::system(
+                        zesdex_domain::agent::prompt::error_recovery_note(&tool_name, &result),
+                    ));
+                    consecutive_errors = 0;
                 }
             } else {
-                format!("Unknown tool: {tool_name}")
+                consecutive_errors = 0;
-            };
+            }
 
-            messages.push(ChatMessage::tool(tc.id.clone(), result));
+            messages.push(ChatMessage::tool(id, truncate_tool_output(result)));
-        }
-
-        // Add assistant response if there was text content
-        if !content.is_empty() {
-            messages.push(ChatMessage::assistant(Some(content)));
         }
     }
 
@@ -149,3 +287,111 @@ pub async fn run_agent(
         "Subagent reached iteration limit ({MAX_ITERATIONS})"
     ))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::tools::ToolCtxBuilder;
+    use serde_json::json;
+
+    /// A deterministic mock tool whose `run` returns its own name (opting into
+    /// an optional sleep to make parallel-vs-sequential observable).
+    struct MockTool {
+        name: &'static str,
+        sleep_ms: u64,
+    }
+
+    impl MockTool {
+        fn new(name: &'static str, sleep_ms: u64) -> Self {
+            Self { name, sleep_ms }
+        }
+    }
+
+    impl Tool for MockTool {
+        fn name(&self) -> &'static str {
+            self.name
+        }
+        fn description(&self) -> &'static str {
+            "mock tool for tests"
+        }
+        fn parameters(&self) -> Value {
+            json!({"type":"object","properties":{}})
+        }
+        fn run(&self, _ctx: &ToolCtx, _args: &Value) -> Result<String> {
+            if self.sleep_ms > 0 {
+                std::thread::sleep(std::time::Duration::from_millis(self.sleep_ms));
+            }
+            Ok(self.name.to_string())
+        }
+    }
+
+    fn tc(name: &str, id: usize) -> zesdex_domain::core::ToolCall {
+        zesdex_domain::core::ToolCall {
+            id: format!("call_{id}"),
+            type_: "function".to_string(),
+            function: zesdex_domain::core::ToolFunction {
+                name: name.to_string(),
+                arguments: serde_json::Value::String(String::new()),
+            },
+        }
+    }
+
+    fn ctx() -> ToolCtx {
+        ToolCtxBuilder::default().build()
+    }
+
+    #[test]
+    fn parallel_batch_preserves_original_order() {
+        let tools: Vec<Box<dyn Tool>> = vec![
+            Box::new(MockTool::new("read", 0)),
+            Box::new(MockTool::new("grep", 0)),
+        ];
+        let calls = vec![tc("read", 1), tc("grep", 2), tc("read", 3)];
+
+        let results = execute_tool_batch(&tools, &ctx(), &calls);
+
+        // Results keep the assistant's original call order.
+        let names: Vec<&str> = results.iter().map(|(_, n, _)| n.as_str()).collect();
+        assert_eq!(names, vec!["read", "grep", "read"]);
+        // IDs follow the same original order (ordering contract).
+        let ids: Vec<&str> = results.iter().map(|(id, _, _)| id.as_str()).collect();
+        assert_eq!(ids, vec!["call_1", "call_2", "call_3"]);
+    }
+
+    #[test]
+    fn parallel_read_batch_is_faster_than_sequential() {
+        // Both reads sleep 30ms each. Parallel should finish ~30ms (both run
+        // at once), sequential would take ~60ms.
+        let tools: Vec<Box<dyn Tool>> = vec![Box::new(MockTool::new("read", 30))];
+        let calls = vec![tc("read", 1), tc("read", 2)];
+
+        let started = std::time::Instant::now();
+        let results = execute_tool_batch(&tools, &ctx(), &calls);
+        let elapsed = started.elapsed();
+
+        assert_eq!(results.len(), 2);
+        assert!(
+            elapsed < std::time::Duration::from_millis(55),
+            "parallel read batch took {elapsed:?}, expected concurrent execution"
+        );
+        assert!(elapsed >= std::time::Duration::from_millis(25));
+    }
+
+    #[test]
+    fn mutating_tool_forces_sequential_batch() {
+        // A batch containing a mutating tool ("write") must NOT run in
+        // parallel — the single 30ms read runs alone, then the write runs.
+        let tools: Vec<Box<dyn Tool>> = vec![
+            Box::new(MockTool::new("read", 30)),
+            Box::new(MockTool::new("write", 0)),
+        ];
+        let calls = vec![tc("read", 1), tc("write", 2)];
+
+        let results = execute_tool_batch(&tools, &ctx(), &calls);
+
+        let names: Vec<&str> = results.iter().map(|(_, n, _)| n.as_str()).collect();
+        assert_eq!(names, vec!["read", "write"]);
+        let ids: Vec<&str> = results.iter().map(|(id, _, _)| id.as_str()).collect();
+        assert_eq!(ids, vec!["call_1", "call_2"]);
+    }
+}

apps/infrastructure/src/subagent/provider.rs

@@ -63,15 +63,21 @@ impl SubagentProvider {
 
 /// Resolve subagent provider and model from settings.
 ///
-/// Flow: reads `settings.provider` and `settings.model` → if model is empty,
+/// Flow: reads `settings.provider` and `settings.model` → if provider is
+/// empty, falls back to `app_config.default_provider` → if model is empty,
 /// falls back to the provider config's `default_model` → if that is also
-/// empty, uses the domain default model constant.
+/// empty, uses `app_config.default_model` → finally the domain default model
+/// constant.
 #[instrument]
 pub fn resolve_subagent_provider(
     settings: &zesdex_domain::cms::Settings,
     app_config: &zesdex_domain::cms::AppConfig,
 ) -> (String, String) {
-    let provider = settings.provider.clone();
+    let provider = if settings.provider.is_empty() {
+        app_config.default_provider.clone()
+    } else {
+        settings.provider.clone()
+    };
     let model = settings.model.clone();
 
     // Use the default model from the provider config if available
@@ -80,6 +86,7 @@ pub fn resolve_subagent_provider(
             .providers
             .get(&provider)
             .and_then(|p| p.default_model.clone())
+            .or_else(|| Some(app_config.default_model.clone()))
             .unwrap_or_else(|| zesdex_domain::agent::defaults::DEFAULT_MODEL.to_string())
     } else {
         model

apps/infrastructure/src/subagent/spawn.rs

@@ -32,7 +32,6 @@ pub fn spawn_subagent(
 ) -> thread::JoinHandle<Result<String>> {
     info!("Spawning subagent: {directive}");
     thread::spawn(move || {
-        let rt = tokio::runtime::Runtime::new()?;
+        crate::runtime::runtime().block_on(run_agent(ctx, &directive, access, tool_ctx))
-        rt.block_on(run_agent(ctx, &directive, access, tool_ctx))
     })
 }

apps/infrastructure/src/tools/executor.rs

@@ -15,6 +15,13 @@ impl InfrastructureToolExecutor {
             tools: all_tools(),
         }
     }
+
+    /// Whether a tool is read-only and safe to execute concurrently with
+    /// other parallel-safe tools. Delegates to the registry so the main
+    /// turn loop and subagent engine share one source of truth.
+    pub fn is_parallel_safe(tool_name: &str) -> bool {
+        crate::tools::tool_is_parallel_safe(tool_name)
+    }
 }
 
 impl ToolExecutor for InfrastructureToolExecutor {
@@ -37,4 +44,8 @@ impl ToolExecutor for InfrastructureToolExecutor {
             }
         }
     }
+
+    fn is_parallel_safe(&self, tool_name: &str) -> bool {
+        Self::is_parallel_safe(tool_name)
+    }
 }

apps/infrastructure/src/tools/mod.rs

@@ -59,7 +59,7 @@ pub mod workflow;
 // like `crate::tools::{Tool, ToolCtx}` continue to work.
 pub use context::{ToolCtx, ToolCtxBuilder};
 pub use graduated::{check_graduated_checks, GraduatedCheck};
-pub use registry::{all_tools, tool_defs, tool_is_risky};
+pub use registry::{all_tools, tool_defs, tool_is_parallel_safe, tool_is_risky};
 pub use util::{arg_str, execute_cmd, log_write_edit_tool, resolve_path};
 
 /// Common interface every agent-invocable tool implements.

apps/infrastructure/src/tools/parallel_delegate.rs

@@ -123,7 +123,7 @@ impl Tool for ParallelDelegate {
                 .collect()
         } else {
             // Auto-split using LLM
-            let rt = tokio::runtime::Runtime::new()?;
+            let rt = crate::runtime::runtime();
             let directives = rt.block_on(auto_split_task(
                 &task,
                 max_parallel,
@@ -146,49 +146,53 @@ impl Tool for ParallelDelegate {
             "parallel delegation: starting subagents"
         );
 
-        // Spawn agents in parallel
+        // Spawn agents in parallel — bounded: never more than `max_parallel`
-        let mut handles = Vec::new();
+        // subagent threads in flight at once (Claude Code-style isolation).
-        for (i, (directive, access)) in directives.iter().enumerate() {
-            let subagent_ctx = SubagentContext::new(
-                directive.clone(),
-                ctx.clone(),
-                format!("{access:?}"),
-                base_url.clone(),
-                api_key.clone(),
-                model.clone(),
-            );
-
-            debug!(agent_index = i, access = ?access, "spawning parallel agent");
-            let handle = spawn_subagent(subagent_ctx, directive.clone(), *access, ctx.clone());
-            handles.push((i, handle));
-        }
-
-        // Join all results
         let mut results: Vec<(usize, String, String)> = Vec::new();
-        for (i, handle) in handles {
+        for batch in directives.chunks(max_parallel) {
-            match handle.join() {
+            let mut handles = Vec::with_capacity(batch.len());
-                Ok(Ok(output)) => {
+            for (i, (directive, access)) in batch.iter().enumerate() {
-                    info!(agent_index = i, "parallel agent completed");
+                let global_idx = results.len() + i;
-                    results.push((i, directives[i].0.clone(), output));
+                let subagent_ctx = SubagentContext::new(
-                }
+                    directive.clone(),
-                Ok(Err(e)) => {
+                    ctx.clone(),
-                    warn!(agent_index = i, error = %e, "parallel agent failed");
+                    format!("{access:?}"),
-                    results.push((i, directives[i].0.clone(), format!("[ERROR] {e}")));
+                    base_url.clone(),
-                }
+                    api_key.clone(),
-                Err(e) => {
+                    model.clone(),
-                    warn!(agent_index = i, error = ?e, "parallel agent panicked");
+                );
-                    results.push((
+
-                        i,
+                debug!(agent_index = global_idx, access = ?access, "spawning parallel agent");
-                        directives[i].0.clone(),
+                let handle = spawn_subagent(subagent_ctx, directive.clone(), *access, ctx.clone());
-                        "[ERROR] Agent panicked".to_string(),
+                handles.push((global_idx, handle));
-                    ));
+            }
+
+            // Join this batch before spawning the next.
+            for (i, handle) in handles {
+                match handle.join() {
+                    Ok(Ok(output)) => {
+                        info!(agent_index = i, "parallel agent completed");
+                        results.push((i, directives[i].0.clone(), output));
+                    }
+                    Ok(Err(e)) => {
+                        warn!(agent_index = i, error = %e, "parallel agent failed");
+                        results.push((i, directives[i].0.clone(), format!("[ERROR] {e}")));
+                    }
+                    Err(e) => {
+                        warn!(agent_index = i, error = ?e, "parallel agent panicked");
+                        results.push((
+                            i,
+                            directives[i].0.clone(),
+                            "[ERROR] Agent panicked".to_string(),
+                        ));
+                    }
                 }
             }
         }
 
         // Consolidate results
         if synthesize && results.len() > 1 {
-            let rt = tokio::runtime::Runtime::new()?;
+            let rt = crate::runtime::runtime();
             let consolidated =
                 rt.block_on(consolidate_results(&results, &base_url, &api_key, &model))?;
             Ok(format!(

apps/infrastructure/src/tools/registry.rs

@@ -52,6 +52,34 @@ pub fn tool_is_risky(name: &str) -> bool {
     matches!(name, "write" | "delete" | "edit" | "bash" | "git_operator")
 }
 
+/// Whether a tool by name is read-only and therefore safe to run *in
+/// parallel* with other tool calls within the same assistant message.
+///
+/// Read-only tools only inspect the workspace (read files, grep, glob,
+/// semantic search, list symbols, recall memory, web search, directory
+/// listing). They have no side effects, so concurrent execution cannot
+/// create data races or conflicting writes.
+///
+/// Everything else (edits, writes, deletes, shell, git, planning, memory
+/// writes, agent/spawn orchestration) stays sequential to preserve
+/// correctness.
+pub fn tool_is_parallel_safe(name: &str) -> bool {
+    matches!(
+        name,
+        "read"
+            | "grep"
+            | "glob"
+            | "semantic_search"
+            | "list_symbols"
+            | "web_search"
+            | "recall"
+            | "dir_list"
+            | "pong"
+            | "seq_think"
+            | "dir_cache_update"
+    )
+}
+
 /// Convert a list of tools into provider-facing `ToolDef` request schema.
 pub fn tool_defs(tools: &[Box<dyn super::Tool>]) -> Vec<zesdex_domain::core::ToolDef> {
     tools
@@ -66,3 +94,59 @@ pub fn tool_defs(tools: &[Box<dyn super::Tool>]) -> Vec<zesdex_domain::core::Too
         })
         .collect()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn read_only_tools_are_parallel_safe() {
+        for name in [
+            "read",
+            "grep",
+            "glob",
+            "semantic_search",
+            "list_symbols",
+            "web_search",
+            "recall",
+            "dir_list",
+            "pong",
+            "seq_think",
+            "dir_cache_update",
+        ] {
+            assert!(
+                tool_is_parallel_safe(name),
+                "{name} should be parallel-safe"
+            );
+        }
+    }
+
+    #[test]
+    fn mutating_and_shell_tools_are_not_parallel_safe() {
+        for name in [
+            "edit",
+            "write",
+            "delete",
+            "bash",
+            "git_operator",
+            "git_worktree",
+            "remember",
+            "forget",
+            "todowrite",
+            "todofinish",
+            "plan_enter",
+            "plan_ready",
+            "workflow_run",
+            "hive_mind",
+            "spawn_agents",
+            "spawn_pipeline",
+            "parallel_delegate",
+            "explore_codebase",
+        ] {
+            assert!(
+                !tool_is_parallel_safe(name),
+                "{name} should NOT be parallel-safe"
+            );
+        }
+    }
+}

apps/infrastructure/src/tools/utility/dir_cache_update.rs

@@ -63,7 +63,7 @@ impl crate::tools::Tool for DirCacheUpdate {
         // Persist the resolved paths into the shared DirCache so the TUI
         // and other tools can read the cached listing without re-scanning.
         let dc = ctx.dir_cache.clone();
-        let rt = tokio::runtime::Runtime::new()?;
+        let rt = crate::runtime::runtime();
         rt.block_on(async { dc.write().await.set(resolved).await });
 
         info!(count, "directory cache updated");

apps/infrastructure/src/tools/workflow.rs

@@ -65,7 +65,7 @@ impl Tool for WorkflowRun {
             zesdex_domain::agent::defaults::DEFAULT_MODEL.to_string(),
             None,
         );
-        let rt = tokio::runtime::Runtime::new()?;
+        let rt = crate::runtime::runtime();
         let result: Vec<String> =
             rt.block_on(async { execute_workflow(&script, ctx, &llm_client).await })?;
 
@@ -229,7 +229,7 @@ impl Tool for HiveMind {
             .ok_or_else(|| anyhow::anyhow!("missing 'cycles' array"))?;
 
         info!("Hive mind starting with {} cycles", cycles_val.len());
-        let rt = tokio::runtime::Runtime::new()?;
+        let rt = crate::runtime::runtime();
         let mut all_node_outputs = Vec::new();
 
         for (cycle_idx, cycle_val) in cycles_val.iter().enumerate() {

apps/infrastructure/src/utils.rs

@@ -221,7 +221,14 @@ pub fn build_rich_context(root: &Path) -> String {
     ));
 
     // 2. Custom Rules
-    let rule_files = [".cursorrules", ".zesdexrules", "claude.md", "agent.md"];
+    let rule_files = [
+        "AGENTS.md",
+        "CLAUDE.md",
+        ".cursorrules",
+        ".zesdexrules",
+        "claude.md",
+        "agent.md",
+    ];
     for file in rule_files {
         let p = root.join(file);
         if let Ok(content) = std::fs::read_to_string(&p) {
@@ -268,7 +275,7 @@ pub fn build_rich_context(root: &Path) -> String {
         let p = root.join(file);
         if let Ok(content) = std::fs::read_to_string(&p) {
             let snippet = if content.len() > 1500 {
-                format!("{}\n... (truncated)", &content[..1500])
+                format!("{}\n... (truncated)", truncate_chars(&content, 1500))
             } else {
                 content
             };
@@ -294,7 +301,7 @@ pub fn build_rich_context(root: &Path) -> String {
     let readme_path = root.join("README.md");
     if let Ok(content) = std::fs::read_to_string(&readme_path) {
         let snippet = if content.len() > 1000 {
-            format!("{}\n... (truncated)", &content[..1000])
+            format!("{}\n... (truncated)", truncate_chars(&content, 1000))
         } else {
             content
         };
@@ -341,3 +348,53 @@ pub fn build_rich_context(root: &Path) -> String {
 
     ctx.trim_end().to_string()
 }
+
+/// Truncate a string to at most `max_chars` **characters**, never cutting a
+/// multi-byte UTF-8 code point in half.
+///
+/// `&s[..n]` with `n` a raw byte index panics when `n` lands inside a
+/// multi-byte character (e.g. an emoji, `→`, or CJK in a README/diff). This
+/// helper slices on character boundaries so content is safely capped at a
+/// byte budget while remaining valid UTF-8.
+pub fn truncate_chars(s: &str, max_chars: usize) -> String {
+    if s.chars().count() <= max_chars {
+        return s.to_string();
+    }
+    s.chars().take(max_chars).collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn truncate_chars_leaves_short_strings_unchanged() {
+        assert_eq!(truncate_chars("short", 100), "short");
+        assert_eq!(truncate_chars("", 5), "");
+    }
+
+    #[test]
+    fn truncate_chars_cuts_to_max_chars() {
+        assert_eq!(truncate_chars("hello world", 5), "hello");
+    }
+
+    #[test]
+    fn truncate_chars_never_splits_multibyte_utf8() {
+        // 4 chars each: '→' is 3 bytes. Byte-slicing at 5 would panic; char
+        // slicing must not.
+        let s = "a→b→c→d";
+        let t = truncate_chars(s, 5);
+        assert_eq!(t, "a→b→c");
+        assert!(t.chars().count() <= 5);
+        // No replacement char must appear (valid UTF-8 preserved).
+        assert!(!t.contains('\u{FFFD}'));
+    }
+
+    #[test]
+    fn truncate_chars_handles_emoji() {
+        let s = "🚀🚀🚀🚀";
+        let t = truncate_chars(s, 2);
+        assert_eq!(t, "🚀🚀");
+        assert!(t.chars().count() == 2);
+    }
+}

apps/infrastructure/src/workflow/hive_mind/cycle.rs

@@ -1,11 +1,15 @@
 //! Hive-mind cycle execution — run one cycle of parallel nodes.
 //!
 //! Flow: load settings → resolve LLM credentials → run all directives in the
-//! cycle concurrently via try_join_all → collect Vec<NodeOutput>.
+//! cycle concurrently via a BOUNDED buffer (`buffer_unordered(MAX)`) → collect
+//! `Vec<NodeOutput>`. Unlike `try_join_all`, a single failing node does NOT
+//! fail the whole cycle — failed nodes are logged and replaced with an
+//! `[ERROR]` output so the remaining results are preserved (like Claude
+//! Code's isolated subagents).
 
 use anyhow::Result;
-use futures_util::future::try_join_all;
+use futures_util::stream::StreamExt;
-use tracing::info;
+use tracing::{info, warn};
 
 use zesdex_domain::cms::{AppConfigRepository, SettingsRepository};
 use zesdex_domain::core::Store;
@@ -15,16 +19,21 @@ use crate::subagent::context::SubagentContext;
 use crate::subagent::division::AccessTier;
 use crate::subagent::engine::run_agent;
 use crate::tools::ToolCtx;
-use zesdex_domain::workflow::{CognitiveCycle, NodeOutput};
+use zesdex_domain::workflow::{CognitiveCycle, NodeDirective, NodeOutput};
+
+/// Maximum number of hive-mind nodes running concurrently per cycle.
+/// Keeps thread/runtime pressure bounded (Claude Code-style).
+const MAX_CONCURRENT_NODES: usize = 8;
 
 /// Execute one cycle: run each node directive and collect outputs.
 ///
 /// Flow:
 ///   1. Load `Settings` and `AppConfig` from the store directory.
 ///   2. Resolve provider, model, base_url, and api_key.
-///   3. Spawn all directives concurrently — each builds a `SubagentContext`
+///   3. Spawn directives with bounded concurrency — each builds a
-///      and calls `run_agent` (Full access).
+///      `SubagentContext` and calls `run_agent`.
-///   4. `try_join_all` waits for all to complete, then collect `NodeOutput`s.
+///   4. Collect `NodeOutput`s; failed nodes are logged and replaced with an
+///      `[ERROR]` placeholder so the cycle still completes.
 pub async fn execute_cycle(cycle: &CognitiveCycle, tool_ctx: &ToolCtx) -> Result<Vec<NodeOutput>> {
     info!(
         "Executing cycle {} with {} directives",
@@ -53,10 +62,9 @@ pub async fn execute_cycle(cycle: &CognitiveCycle, tool_ctx: &ToolCtx) -> Result
 
     let cycle_index = cycle.index;
 
-    use zesdex_domain::workflow::NodeDirective;
+    // Run all directives with bounded concurrency. Each node is its own
-
+    // future; failures are collected, not propagated (isolated errors).
-    // Run all directives in this cycle concurrently.
+    let tasks: Vec<_> = cycle
-    let handles: Vec<_> = cycle
         .directives
         .iter()
         .enumerate()
@@ -79,18 +87,33 @@ pub async fn execute_cycle(cycle: &CognitiveCycle, tool_ctx: &ToolCtx) -> Result
                 _ => AccessTier::Read,
             };
 
+            let node_id = format!("Node-{}-{}", cycle_index, i);
             async move {
-                let result = run_agent(ctx, &dir, access, tc).await?;
+                match run_agent(ctx, &dir, access, tc).await {
-                Ok::<NodeOutput, anyhow::Error>(NodeOutput {
+                    Ok(output) => Ok::<NodeOutput, anyhow::Error>(NodeOutput {
-                    id: format!("Node-{}-{}", cycle_index, i),
+                        id: node_id.clone(),
-                    directive: dir,
+                        directive: dir,
-                    output: result,
+                        output,
-                })
+                    }),
+                    Err(e) => {
+                        warn!(node = %node_id, error = %e, "hive-mind node failed (isolated)");
+                        Ok::<NodeOutput, anyhow::Error>(NodeOutput {
+                            id: node_id,
+                            directive: dir,
+                            output: format!("[ERROR] {e}"),
+                        })
+                    }
+                }
             }
         })
         .collect();
 
-    let results = try_join_all(handles).await?;
+    // Bounded concurrency: run at most MAX_CONCURRENT_NODES futures at once.
+    let mut stream = futures_util::stream::iter(tasks).buffer_unordered(MAX_CONCURRENT_NODES);
+    let mut results = Vec::with_capacity(cycle.directives.len());
+    while let Some(node) = stream.next().await {
+        results.push(node?);
+    }
 
     Ok(results)
 }

apps/interfaces/daemon/src/handler.rs

@@ -316,13 +316,13 @@ fn handle_submit_input(state: &mut AppStateRest, text: String) {
         in_flight: std::sync::Arc::new(std::sync::atomic::AtomicBool::new(false)),
         abort: state.abort_flag.clone(),
         api_key: api_key.clone(),
-        model: state.settings.model.clone(),
+        model: zesdex_domain::cms::resolve_effective_model(&state.settings, &state.app_config),
         api_base: provider_cfg.as_ref().map(|cfg| cfg.api_base.clone()),
     };
 
     let client = std::sync::Arc::new(zesdex_infrastructure::llm::provider::LlmClient::new(
         api_key,
-        state.settings.model.clone(),
+        zesdex_domain::cms::resolve_effective_model(&state.settings, &state.app_config),
         provider_cfg.map(|cfg| cfg.api_base.clone()),
     ));
 
@@ -465,14 +465,13 @@ fn handle_compact(state: &mut AppStateRest) {
         .get(provider_name)
         .cloned()
         .unwrap_or_default();
-    let model = state.settings.model.clone();
+    let model = zesdex_domain::cms::resolve_effective_model(&state.settings, &state.app_config);
     let api_base = provider_cfg.map(|cfg| cfg.api_base.clone());
 
     let client = zesdex_infrastructure::llm::provider::LlmClient::new(api_key, model, api_base);
 
     if let Some(ref mut rt) = state.session_runtime {
-        let tokio_rt =
+        let tokio_rt = zesdex_infrastructure::runtime::runtime();
-            tokio::runtime::Runtime::new().expect("create tokio runtime for AI compaction");
         if let Ok(()) = tokio_rt.block_on(
             zesdex_application::agent::turn_service::compact_messages_with_ai(
                 &mut rt.messages,

apps/interfaces/tui/src/turn.rs

@@ -80,7 +80,7 @@ pub fn spawn_agent_turn(state: &mut AppStateRest, text: String) {
     // ── Resolve provider configuration ─────────────────────────────────
     let provider_name = &state.settings.provider;
     let api_key = resolve_api_key(state, provider_name);
-    let model = state.settings.model.clone();
+    let model = zesdex_domain::cms::resolve_effective_model(&state.settings, &state.app_config);
     let api_base = resolve_api_base(state, provider_name);
 
     // ── Build message list ─────────────────────────────────────────────