diff --git a/Cargo.lock b/Cargo.lock
index b10d847..3cf8ffd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -160,6 +160,15 @@ dependencies = [
  "cpufeatures",
 ]
 
+[[package]]
+name = "bs58"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf88ba1141d185c399bee5288d850d63b8369520c1eafc32a0430b5b6c287bf4"
+dependencies = [
+ "tinyvec",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.20.2"
@@ -1485,7 +1494,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c51c9ae4df8a7fba42103df5c621fa3c37eccf3a3c650879e90fc48b11cc192c"
 dependencies = [
  "hashbrown 0.16.1",
- "thiserror 2.0.18",
+ "thiserror",
 ]
 
 [[package]]
@@ -1705,11 +1714,12 @@ dependencies = [
 
 [[package]]
 name = "serde_with"
-version = "3.18.0"
+version = "3.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd5414fad8e6907dbdd5bc441a50ae8d6e26151a03b1de04d89a5576de61d01f"
+checksum = "76a5c54c7310e7b8b9577c286d7e399ddd876c3e12b3ed917a8aabc4b96e9e8c"
 dependencies = [
  "base64",
+ "bs58",
  "chrono",
  "hex",
  "indexmap 1.9.3",
@@ -1724,9 +1734,9 @@ dependencies = [
 
 [[package]]
 name = "serde_with_macros"
-version = "3.18.0"
+version = "3.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3db8978e608f1fe7357e211969fd9abdcae80bac1ba7a3369bb7eb6b404eb65"
+checksum = "84d57bc0c8b9a17920c178daa6bb924850d54a9c97ab45194bb8c17ad66bb660"
 dependencies = [
  "darling",
  "proc-macro2",
diff --git a/src/agent.rs b/src/agent.rs
index a37843f..2278def 100644
--- a/src/agent.rs
+++ b/src/agent.rs
@@ -332,7 +332,7 @@ pub async fn handle_prompt(
 
         if cancel.is_cancelled() {
             // Mark any pending tool calls as cancelled before returning.
-            for (_id_str, tc_id) in announced.iter() {
+            for tc_id in announced.values() {
                 let upd = ToolCallUpdate::new(
                     tc_id.clone(),
                     ToolCallUpdateFields::new().status(ToolCallStatus::Failed),