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Fix research_status polling tool falsely deduplicated across auto-continue iterations

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The dedup logic compared only tool name+args, ignoring the unique tool call
IDs that native providers (Anthropic) assign to each invocation. When the
model called research_status {} in iteration 1, auto-continued, and called
it again in iteration 2 with identical args but a new ID, the second call
was marked DUP IN MSG and skipped. With no tool executed and no text, the
stream errored with 'No response received from the model.'

Three-part fix:
- ID-aware DUP IN MSG: check_duplicate_in_previous_message() uses tool call
  IDs when both are non-empty (different IDs = different invocations)
- History cutoff: only checks messages from before the current iteration to
  prevent within-iteration false positives
- DUP IN ITER: last_executed_tool on IterationState catches stuttered
  duplicates across chunks within the same response

Regression test reproduces the exact bug (fails without fix, passes with).
This commit is contained in:
Dhanji R. Prasanna
2026-02-12 15:54:24 +11:00
parent 88d2b9592b
commit 68f8f13b38
4 changed files with 156 additions and 11 deletions
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56
crates/g3-core/src/lib.rs
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@@ -1376,9 +1376,12 @@ impl<W: UiWriter> Agent<W> {
/// Check if a tool call is a duplicate of the last tool call in the previous assistant message.
/// Returns Some("DUP IN MSG") if it's a duplicate, None otherwise.
fn check_duplicate_in_previous_message(&self, tool_call: &ToolCall) -> Option<String> {
// Find the most recent assistant message
for msg in self.context_window.conversation_history.iter().rev() {
fn check_duplicate_in_previous_message(&self, tool_call: &ToolCall, history_cutoff: usize) -> Option<String> {
// Find the most recent assistant message, but only look at messages that
// existed before the current streaming iteration started. This prevents
// tool calls within the same response from being marked as DUP IN MSG
// against messages added during the current iteration's tool execution.
for msg in self.context_window.conversation_history[..history_cutoff].iter().rev() {
if !matches!(msg.role, MessageRole::Assistant) {
continue;
}
@@ -1386,13 +1389,27 @@ impl<W: UiWriter> Agent<W> {
// Check structured tool_calls first (native tool calling)
if !msg.tool_calls.is_empty() {
if let Some(last_tc) = msg.tool_calls.last() {
let prev = ToolCall {
tool: last_tc.name.clone(),
args: last_tc.input.clone(),
id: last_tc.id.clone(),
};
if streaming::are_tool_calls_duplicate(&prev, tool_call) {
return Some("DUP IN MSG".to_string());
// When both tool calls have non-empty IDs from native providers
// (e.g. Anthropic "toolu_*"), each API invocation gets a unique ID.
// Different IDs mean distinct invocations — not duplicates.
// This is critical for polling tools like research_status that are
// called repeatedly with identical arguments across turns.
if !last_tc.id.is_empty() && !tool_call.id.is_empty() {
if last_tc.id == tool_call.id {
return Some("DUP IN MSG".to_string());
}
// Different IDs = different invocations, not a duplicate
} else {
// Fallback for JSON-based tool calls (embedded models) where
// IDs are auto-generated and not meaningful for dedup.
let prev = ToolCall {
tool: last_tc.name.clone(),
args: last_tc.input.clone(),
id: last_tc.id.clone(),
};
if streaming::are_tool_calls_duplicate(&prev, tool_call) {
return Some("DUP IN MSG".to_string());
}
}
}
// Only check the most recent assistant message
@@ -2280,6 +2297,12 @@ Skip if nothing new. Be brief."#;
// Create fresh iteration state for this streaming iteration
let mut iter = streaming::IterationState::new();
// Snapshot history length before this iteration. Used by DUP IN MSG
// detection to avoid comparing against messages added during this
// iteration's own tool executions (which would false-positive on
// multi-tool responses where the model issues the same tool twice).
let history_len_before_iteration = self.context_window.conversation_history.len();
while let Some(chunk_result) = stream.next().await {
match chunk_result {
Ok(chunk) => {
@@ -2356,9 +2379,19 @@ Skip if nothing new. Be brief."#;
// Always process all tool calls - they will be executed after stream ends
// De-duplicate tool calls (sequential duplicates in chunk + duplicates from previous message)
let last_executed_in_iter = iter.last_executed_tool.clone();
let deduplicated_tools =
streaming::deduplicate_tool_calls(completed_tools, |tc| {
self.check_duplicate_in_previous_message(tc)
// First check against the last tool executed in this
// iteration (catches duplicates across chunks within
// the same streaming response).
if let Some(ref last) = last_executed_in_iter {
if streaming::are_tool_calls_duplicate(last, tc) {
return Some("DUP IN ITER".to_string());
}
}
// Then check against messages from before this iteration
self.check_duplicate_in_previous_message(tc, history_len_before_iteration)
});
// Process each tool call
@@ -2640,6 +2673,7 @@ Skip if nothing new. Be brief."#;
// 2. At the end when no tools were executed (handled in the "no tool executed" branch)
iter.tool_executed = true;
iter.last_executed_tool = Some(tool_call.clone());
state.any_tool_executed = true; // Track across all iterations
// Reset the JSON tool call filter state after each tool execution