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 +1,10 @@
+## [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)
 
 

Cargo.lock

@@ -4862,7 +4862,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-api"
-version = "1.19.5"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "argon2",
@@ -4885,7 +4885,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-application"
-version = "1.19.5"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "base64",
@@ -4903,7 +4903,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-bootstrap"
-version = "1.19.5"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "chrono",
@@ -4920,7 +4920,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-daemon"
-version = "1.19.5"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "base64",
@@ -4944,7 +4944,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-domain"
-version = "1.19.5"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "base64",
@@ -4960,7 +4960,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-gateway"
-version = "1.19.5"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "axum",
@@ -4987,7 +4987,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-grpc"
-version = "1.19.5"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "axum",
@@ -5004,7 +5004,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-infrastructure"
-version = "1.19.5"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "argon2",
@@ -5052,7 +5052,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-tui"
-version = "1.19.5"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "base64",
@@ -5078,7 +5078,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-web"
-version = "1.19.5"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "axum",
@@ -5098,7 +5098,7 @@ dependencies = [
 
 [[package]]
 name = "zesdex-ws"
-version = "1.19.5"
+version = "1.19.6"
 dependencies = [
  "anyhow",
  "axum",

Cargo.toml

@@ -15,7 +15,7 @@ members = [
 ]
 
 [workspace.package]
-version = "1.20.0"
+version = "1.20.1"
 edition = "2021"
 authors = ["asepharyana <superaseph@gmail.com>"]
 

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

@@ -220,7 +220,7 @@ pub async fn run_agent(
             .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() {
@@ -229,6 +229,12 @@ pub async fn run_agent(
             return Ok(content);
         }
 
+        // Push the assistant message (with its tool_calls) BEFORE executing
+        // so the tool-calling contract is honoured: tool results reference
+        // the calls declared in the preceding assistant message. Without
+        // this, the history is malformed (`[...tool, tool, assistant]`).
+        messages.push(response_msg);
+
         // 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);
@@ -266,11 +272,6 @@ pub async fn run_agent(
 
             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)));
-        }
     }
 
     info!("Subagent reached iteration limit ({MAX_ITERATIONS})");

apps/infrastructure/src/utils.rs

@@ -275,7 +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
             };
@@ -301,7 +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
         };
@@ -348,3 +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);
+    }
+}