[router][grpc] Support streaming parsing with Tool Choice in chat completions API (#12677)

sgl-router/py_test/e2e_grpc/function_call/test_tool_choice.py

@@ -274,9 +274,6 @@ class TestToolChoiceLlama32(CustomTestCase):
         self.assertIsNotNone(tool_calls)
         self.assertGreater(len(tool_calls), 0)
 
-    @unittest.skip(
-        "Skipping required streaming test as it is not supported by the router"
-    )
     def test_tool_choice_required_streaming(self):
         """Test tool_choice='required' in streaming mode"""
         tools = self.get_test_tools()
@@ -325,9 +322,6 @@ class TestToolChoiceLlama32(CustomTestCase):
         for tool_call in tool_calls:
             self.assertEqual(tool_call.function.name, "get_weather")
 
-    @unittest.skip(
-        "Skipping required streaming test as it is not supported by the router"
-    )
     def test_tool_choice_specific_function_streaming(self):
         """Test tool_choice with specific function in streaming mode"""
         tools = self.get_test_tools()
@@ -363,9 +357,6 @@ class TestToolChoiceLlama32(CustomTestCase):
 
         self.assertEqual(found_name, "get_weather")
 
-    @unittest.skip(
-        "Skipping required streaming arguments chunks json test as it is not supported by the router"
-    )
     def test_required_streaming_arguments_chunks_json(self):
         """In streaming required mode, complete tool call arguments should be valid JSON when all chunks are combined"""
         tools = self.get_test_tools()

sgl-router/py_test/integration/load_balancing/test_power_of_two.py

@@ -62,9 +62,15 @@ def test_power_of_two_prefers_less_loaded(mock_workers, router_manager):
         except Exception:
             pass
 
-    with concurrent.futures.ThreadPoolExecutor(max_workers=32) as ex:
-        list(ex.map(_direct_load, range(128)))
-    time.sleep(1)
+    # Start background load in a non-blocking way to keep slow worker busy
+    background_executor = concurrent.futures.ThreadPoolExecutor(max_workers=8)
+    background_futures = []
+    for i in range(32):
+        future = background_executor.submit(_direct_load, i)
+        background_futures.append(future)
+
+    # Wait longer for the load monitor to update (at least 2 monitor intervals)
+    time.sleep(3)
 
     def call(i):
         r = requests.post(
@@ -85,6 +91,9 @@ def test_power_of_two_prefers_less_loaded(mock_workers, router_manager):
         for wid in ex.map(call, range(200)):
             counts[wid] += 1
 
+    # Clean up background executor
+    background_executor.shutdown(wait=False)
+
     # Expect the slow worker (higher latency/inflight) to receive fewer requests
     fast_worker_id = [i for i in ids if i != slow_id][0]
     assert counts[slow_id] < counts[fast_worker_id], counts

sgl-router/src/routers/grpc/regular/responses/context.rs

 //! Context for /v1/responses endpoint handlers
 //!
 //! Bundles all dependencies needed by responses handlers to avoid passing
-//! 10+ parameters to every function (fixes clippy::too_many_arguments).
+//! 10+ parameters to every function.
 
 use std::{collections::HashMap, sync::Arc};
 

sgl-router/src/routers/grpc/regular/streaming.rs

@@ -210,6 +210,17 @@ impl StreamingProcessor {
                 model,
             );
 
+        // Check if JSON schema constraint was used (specific function or required mode)
+        let used_json_schema = match tool_choice {
+            Some(ToolChoice::Function { .. }) => true,
+            Some(ToolChoice::Value(ToolChoiceValue::Required)) => true,
+            Some(ToolChoice::AllowedTools { mode, .. }) => mode == "required",
+            _ => false,
+        };
+
+        // Check if this is the specific function case (LLM generates parameters only, no name field)
+        let is_specific_function = matches!(tool_choice, Some(ToolChoice::Function { .. }));
+
         let tool_parser_available = tools.is_some()
             && utils::check_tool_parser_availability(
                 &self.tool_parser_factory,
@@ -342,10 +353,24 @@ impl StreamingProcessor {
                     if !in_reasoning
                         && tool_choice_enabled
                         && tools.is_some()
-                        && tool_parser_available
+                        && (tool_parser_available || used_json_schema)
                     {
-                        let tool_chunks = self
-                            .process_tool_calls_stream(
+                        let tool_chunks = if is_specific_function {
+                            // Handle specific function case - emit tool call deltas with arguments
+                            Self::process_specific_function_stream(
+                                &delta,
+                                index,
+                                &mut has_tool_calls,
+                                tool_choice,
+                                request_id,
+                                model,
+                                created,
+                                system_fingerprint,
+                                history_tool_calls_count,
+                            )
+                        } else {
+                            // Use incremental parser for regular/required modes
+                            self.process_tool_calls_stream(
                                 &delta,
                                 index,
                                 &mut tool_parsers,
@@ -356,8 +381,10 @@ impl StreamingProcessor {
                                 created,
                                 system_fingerprint,
                                 history_tool_calls_count,
+                                used_json_schema,
                             )
-                            .await;
+                            .await
+                        };
 
                         for chunk in tool_chunks {
                             Self::format_sse_chunk_into(&mut sse_buffer, &chunk);
@@ -1089,6 +1116,101 @@ impl StreamingProcessor {
         (delta.to_string(), None, false)
     }
 
+    /// Helper: Process specific function case - emit tool call deltas with arguments
+    #[allow(clippy::too_many_arguments)]
+    fn process_specific_function_stream(
+        delta: &str,
+        index: u32,
+        has_tool_calls: &mut HashMap<u32, bool>,
+        tool_choice: &Option<ToolChoice>,
+        request_id: &str,
+        model: &str,
+        created: u64,
+        system_fingerprint: Option<&str>,
+        history_tool_calls_count: usize,
+    ) -> Vec<ChatCompletionStreamResponse> {
+        let mut chunks = Vec::new();
+
+        if let Some(ToolChoice::Function { function, .. }) = tool_choice {
+            let is_first_call = !has_tool_calls.contains_key(&index);
+
+            if is_first_call {
+                // First chunk: send name and id
+                has_tool_calls.insert(index, true);
+
+                let tool_call_id = utils::generate_tool_call_id(
+                    model,
+                    &function.name,
+                    0,
+                    history_tool_calls_count,
+                );
+
+                chunks.push(ChatCompletionStreamResponse {
+                    id: request_id.to_string(),
+                    object: "chat.completion.chunk".to_string(),
+                    created,
+                    model: model.to_string(),
+                    system_fingerprint: system_fingerprint.map(|s| s.to_string()),
+                    choices: vec![ChatStreamChoice {
+                        index,
+                        delta: ChatMessageDelta {
+                            role: Some("assistant".to_string()),
+                            content: None,
+                            tool_calls: Some(vec![ToolCallDelta {
+                                index: 0,
+                                id: Some(tool_call_id),
+                                tool_type: Some("function".to_string()),
+                                function: Some(FunctionCallDelta {
+                                    name: Some(function.name.clone()),
+                                    arguments: None,
+                                }),
+                            }]),
+                            reasoning_content: None,
+                        },
+                        logprobs: None,
+                        finish_reason: None,
+                        matched_stop: None,
+                    }],
+                    usage: None,
+                });
+            }
+
+            // Emit arguments delta
+            if !delta.is_empty() {
+                chunks.push(ChatCompletionStreamResponse {
+                    id: request_id.to_string(),
+                    object: "chat.completion.chunk".to_string(),
+                    created,
+                    model: model.to_string(),
+                    system_fingerprint: system_fingerprint.map(|s| s.to_string()),
+                    choices: vec![ChatStreamChoice {
+                        index,
+                        delta: ChatMessageDelta {
+                            role: Some("assistant".to_string()),
+                            content: None,
+                            tool_calls: Some(vec![ToolCallDelta {
+                                index: 0,
+                                id: None,
+                                tool_type: None,
+                                function: Some(FunctionCallDelta {
+                                    name: None,
+                                    arguments: Some(delta.to_string()),
+                                }),
+                            }]),
+                            reasoning_content: None,
+                        },
+                        logprobs: None,
+                        finish_reason: None,
+                        matched_stop: None,
+                    }],
+                    usage: None,
+                });
+            }
+        }
+
+        chunks
+    }
+
     /// Helper: Process tool calls in streaming mode
     #[allow(clippy::too_many_arguments)]
     async fn process_tool_calls_stream(
@@ -1103,17 +1225,27 @@ impl StreamingProcessor {
         created: u64,
         system_fingerprint: Option<&str>,
         history_tool_calls_count: usize,
+        use_json_parser: bool,
     ) -> Vec<ChatCompletionStreamResponse> {
         let mut chunks = Vec::new();
 
         // Create fresh parser for this index (not pooled, to avoid state pollution)
         tool_parsers.entry(index).or_insert_with(|| {
-            let parser = utils::create_tool_parser(
-                &self.tool_parser_factory,
-                self.configured_tool_parser.as_ref(),
-                model,
-            )
-            .expect("Parser should be available - checked upfront");
+            let parser = if use_json_parser {
+                utils::create_tool_parser(
+                    &self.tool_parser_factory,
+                    Some(&"json".to_string()),
+                    model,
+                )
+                .expect("JSON parser should be available")
+            } else {
+                utils::create_tool_parser(
+                    &self.tool_parser_factory,
+                    self.configured_tool_parser.as_ref(),
+                    model,
+                )
+                .expect("Parser should be available - checked upfront")
+            };
             Arc::new(tokio::sync::Mutex::new(parser))
         });
 

sgl-router/src/tool_parser/parsers/deepseek.rs

@@ -21,6 +21,8 @@ use crate::{
 /// - Unicode token delimiters
 /// - JSON arguments in code blocks
 /// - Support for multiple sequential tool calls
+///
+/// Reference: https://huggingface.co/deepseek-ai/DeepSeek-V3-0324?chat_template=default
 pub struct DeepSeekParser {
     /// Regex for extracting complete tool calls
     tool_call_extractor: Regex,

sgl-router/src/tool_parser/parsers/helpers.rs

@@ -217,8 +217,18 @@ pub fn handle_json_tool_streaming(
         }
     };
 
-    // Check if JSON is complete
-    let is_complete = end_idx == json_str.len() && serde_json::from_str::<Value>(json_str).is_ok();
+    // Check if JSON is complete - validate only the parsed portion
+    // Ensure end_idx is on a valid UTF-8 character boundary
+    let safe_end_idx = if json_str.is_char_boundary(end_idx) {
+        end_idx
+    } else {
+        // Find the nearest valid character boundary before end_idx
+        (0..end_idx)
+            .rev()
+            .find(|&i| json_str.is_char_boundary(i))
+            .unwrap_or(0)
+    };
+    let is_complete = serde_json::from_str::<Value>(&json_str[..safe_end_idx]).is_ok();
 
     // Validate tool name if present
     if let Some(name) = obj.get("name").and_then(|v| v.as_str()) {

sgl-router/src/tool_parser/parsers/json.rs

@@ -39,6 +39,12 @@ pub struct JsonParser {
 
     /// Separator between multiple tool calls
     tool_call_separator: &'static str,
+
+    /// Track whether we're parsing array format `[...]` vs single object `{...}`
+    is_array_format: bool,
+
+    /// Track whether we've already stripped the closing ] bracket (for array format)
+    array_closed: bool,
 }
 
 impl JsonParser {
@@ -52,6 +58,8 @@ impl JsonParser {
             current_tool_name_sent: false,
             streamed_args_for_tool: Vec::new(),
             tool_call_separator: ",",
+            is_array_format: false,
+            array_closed: false,
         }
     }
 
@@ -211,14 +219,31 @@ impl ToolParser for JsonParser {
         self.buffer.push_str(chunk);
         let current_text = &self.buffer.clone();
 
+        // Determine format on first parse (array vs single object)
+        if self.current_tool_id == -1 && self.has_tool_markers(current_text) {
+            self.is_array_format = current_text.trim().starts_with('[');
+        }
+
         // Check if current_text has tool_call
-        let has_tool_start = self.has_tool_markers(current_text)
-            || (self.current_tool_id >= 0 && current_text.starts_with(self.tool_call_separator));
+        // Once array is closed, don't treat [ or { as tool markers
+        let has_tool_start = (!self.array_closed && self.has_tool_markers(current_text))
+            || (self.current_tool_id > 0 && current_text.starts_with(self.tool_call_separator));
 
         if !has_tool_start {
-            let normal_text = self.buffer.clone();
+            let mut normal_text = self.buffer.clone();
             self.buffer.clear();
 
+            // Strip ] only once (the closing bracket of JSON array format)
+            // Only for array format and only if we haven't already closed it
+            if self.is_array_format
+                && !self.array_closed
+                && self.current_tool_id > 0
+                && normal_text.starts_with("]")
+            {
+                normal_text = normal_text.strip_prefix("]").unwrap().to_string();
+                self.array_closed = true;
+            }
+
             return Ok(StreamingParseResult {
                 normal_text,
                 calls: vec![],
@@ -233,12 +258,12 @@ impl ToolParser for JsonParser {
         let start_idx = if let Some(bracket_pos) = current_text.find('[') {
             let brace_pos = current_text.find('{');
             match brace_pos {
-                Some(bp) if bp < bracket_pos => bp,
+                Some(bp) => bp,
                 _ => bracket_pos,
             }
         } else if let Some(brace_pos) = current_text.find('{') {
             brace_pos
-        } else if self.current_tool_id >= 0 && current_text.starts_with(self.tool_call_separator) {
+        } else if self.current_tool_id > 0 && current_text.starts_with(self.tool_call_separator) {
             self.tool_call_separator.len()
         } else {
             0
@@ -274,5 +299,7 @@ impl ToolParser for JsonParser {
             &mut self.current_tool_name_sent,
             &mut self.streamed_args_for_tool,
         );
+        self.is_array_format = false;
+        self.array_closed = false;
     }
 }

sgl-router/src/tool_parser/parsers/kimik2.rs

@@ -21,6 +21,8 @@ use crate::{
 /// - Token-based delimiters
 /// - Function calls with explicit indexing
 /// - JSON arguments
+///
+/// Reference: https://huggingface.co/moonshotai/Kimi-K2-Instruct/blob/main/docs/tool_call_guidance.md
 pub struct KimiK2Parser {
     /// Regex for extracting complete tool calls
     tool_call_extractor: Regex,

sgl-router/src/tool_parser/parsers/llama.rs

@@ -181,7 +181,7 @@ impl ToolParser for LlamaParser {
 
         // Check if current_text has tool_call
         let has_tool_start = self.has_tool_markers(current_text)
-            || (self.current_tool_id >= 0 && current_text.starts_with(self.tool_call_separator));
+            || (self.current_tool_id > 0 && current_text.starts_with(self.tool_call_separator));
 
         if !has_tool_start {
             // Only clear buffer if we're sure no tool call is starting
@@ -205,7 +205,7 @@ impl ToolParser for LlamaParser {
         // Determine start index for JSON parsing
         let start_idx = if let Some(pos) = current_text.find(self.bot_token) {
             pos + self.bot_token.len()
-        } else if self.current_tool_id >= 0 && current_text.starts_with(self.tool_call_separator) {
+        } else if self.current_tool_id > 0 && current_text.starts_with(self.tool_call_separator) {
             self.tool_call_separator.len()
         } else {
             0

sgl-router/src/tool_parser/parsers/mistral.rs

@@ -17,10 +17,7 @@ use crate::{
 /// Handles the Mistral-specific format:
 /// `[TOOL_CALLS] [{"name": "func", "arguments": {...}}, ...]`
 ///
-/// Features:
-/// - Bracket counting for proper JSON array extraction
-/// - Support for multiple tool calls in a single array
-/// - String-aware parsing to handle nested brackets in JSON
+/// Reference: https://huggingface.co/mistralai/Mistral-7B-Instruct-v0.3?chat_template=default
 pub struct MistralParser {
     /// Parser for handling incomplete JSON during streaming
     partial_json: PartialJson,
@@ -42,7 +39,11 @@ pub struct MistralParser {
 
     /// Token configuration
     bot_token: &'static str,
+    eot_token: &'static str,
     tool_call_separator: &'static str,
+
+    /// Track whether we've already stripped the closing ] bracket
+    array_closed: bool,
 }
 
 impl MistralParser {
@@ -56,7 +57,9 @@ impl MistralParser {
             current_tool_name_sent: false,
             streamed_args_for_tool: Vec::new(),
             bot_token: "[TOOL_CALLS] [",
+            eot_token: "]",
             tool_call_separator: ", ",
+            array_closed: false,
         }
     }
 
@@ -207,14 +210,27 @@ impl ToolParser for MistralParser {
 
         // Check if current_text has tool_call
         let has_tool_start = self.has_tool_markers(current_text)
-            || (self.current_tool_id >= 0 && current_text.starts_with(self.tool_call_separator));
+            || (self.current_tool_id > 0 && current_text.starts_with(self.tool_call_separator));
 
         if !has_tool_start {
             // Only clear buffer if we're sure no tool call is starting
             if helpers::ends_with_partial_token(&self.buffer, self.bot_token).is_none() {
-                let normal_text = self.buffer.clone();
+                let mut normal_text = self.buffer.clone();
                 self.buffer.clear();
 
+                // Strip ] only once (the closing bracket of [TOOL_CALLS] array)
+                // current_tool_id > 0 means we've parsed at least one tool
+                if !self.array_closed
+                    && self.current_tool_id > 0
+                    && normal_text.starts_with(self.eot_token)
+                {
+                    normal_text = normal_text
+                        .strip_prefix(self.eot_token)
+                        .unwrap()
+                        .to_string();
+                    self.array_closed = true;
+                }
+
                 return Ok(StreamingParseResult {
                     normal_text,
                     calls: vec![],
@@ -231,7 +247,7 @@ impl ToolParser for MistralParser {
         // Determine start index for JSON parsing
         let start_idx = if let Some(pos) = current_text.find(self.bot_token) {
             pos + self.bot_token.len()
-        } else if self.current_tool_id >= 0 && current_text.starts_with(self.tool_call_separator) {
+        } else if self.current_tool_id > 0 && current_text.starts_with(self.tool_call_separator) {
             self.tool_call_separator.len()
         } else {
             0
@@ -266,5 +282,6 @@ impl ToolParser for MistralParser {
             &mut self.current_tool_name_sent,
             &mut self.streamed_args_for_tool,
         );
+        self.array_closed = false;
     }
 }

sgl-router/src/tool_parser/parsers/pythonic.rs

@@ -9,6 +9,7 @@ use std::sync::OnceLock;
 ///
 /// This format is used by Llama models and uses Python literals
 /// rather than JSON for arguments.
+/// Reference: https://huggingface.co/meta-llama/Llama-4-Scout-17B-16E-Instruct?chat_template=default
 use async_trait::async_trait;
 use num_traits::ToPrimitive;
 use regex::Regex;

sgl-router/src/tool_parser/parsers/qwen.rs

@@ -19,10 +19,11 @@ use crate::{
 /// `<tool_call>\n{"name": "func", "arguments": {...}}\n</tool_call>`
 ///
 /// Features:
-/// - XML-style tags with JSON content
-/// - Support for multiple sequential tool calls
-/// - Newline-aware parsing
-/// - Buffering for partial end tokens
+/// - Tool Call Tags: `<tool_call>` and `</tool_call>` wrap each individual call
+/// - Each individual call is separated by `\n`
+/// - Function Call Object: JSON object with "name" and "arguments" fields
+///
+/// Reference: https://huggingface.co/Qwen/Qwen2.5-0.5B-Instruct?chat_template=default
 pub struct QwenParser {
     /// Parser for handling incomplete JSON during streaming
     partial_json: PartialJson,
@@ -49,8 +50,9 @@ pub struct QwenParser {
     normal_text_buffer: String,
 
     /// Token configuration
-    bot_token: &'static str,
-    eot_token: &'static str,
+    /// Start/end tokens for each individual tool call (not the entire sequence)
+    individual_tool_start_token: &'static str,
+    individual_tool_end_token: &'static str,
     tool_call_separator: &'static str,
 }
 
@@ -70,8 +72,8 @@ impl QwenParser {
             current_tool_name_sent: false,
             streamed_args_for_tool: Vec::new(),
             normal_text_buffer: String::new(),
-            bot_token: "<tool_call>\n",
-            eot_token: "\n</tool_call>",
+            individual_tool_start_token: "<tool_call>\n",
+            individual_tool_end_token: "\n</tool_call>",
             tool_call_separator: "\n",
         }
     }
@@ -157,11 +159,13 @@ impl ToolParser for QwenParser {
 
         // Check if current_text has tool_call
         let has_tool_start = self.has_tool_markers(current_text)
-            || (self.current_tool_id >= 0 && current_text.starts_with(self.tool_call_separator));
+            || (self.current_tool_id > 0 && current_text.starts_with(self.tool_call_separator));
 
         if !has_tool_start {
             // Only clear buffer if we're sure no tool call is starting
-            if helpers::ends_with_partial_token(&self.buffer, self.bot_token).is_none() {
+            if helpers::ends_with_partial_token(&self.buffer, self.individual_tool_start_token)
+                .is_none()
+            {
                 let normal_text = self.buffer.clone();
                 self.buffer.clear();
 
@@ -170,7 +174,7 @@ impl ToolParser for QwenParser {
                     calls: vec![],
                 });
             } else {
-                // Might be partial bot_token, keep buffering
+                // Might be partial individual_tool_start_token, keep buffering
                 return Ok(StreamingParseResult::default());
             }
         }
@@ -179,9 +183,9 @@ impl ToolParser for QwenParser {
         let tool_indices = helpers::get_tool_indices(tools);
 
         // Determine start index for JSON parsing
-        let start_idx = if let Some(pos) = current_text.find(self.bot_token) {
-            pos + self.bot_token.len()
-        } else if self.current_tool_id >= 0 && current_text.starts_with(self.tool_call_separator) {
+        let start_idx = if let Some(pos) = current_text.find(self.individual_tool_start_token) {
+            pos + self.individual_tool_start_token.len()
+        } else if self.current_tool_id > 0 && current_text.starts_with(self.tool_call_separator) {
             self.tool_call_separator.len()
         } else {
             0
@@ -205,7 +209,7 @@ impl ToolParser for QwenParser {
             self.normal_text_buffer.push_str(&result.normal_text);
 
             // Check if buffer contains complete end token (without leading newline)
-            let end_token_without_newline = &self.eot_token[1..]; // "</tool_call>"
+            let end_token_without_newline = &self.individual_tool_end_token[1..]; // "</tool_call>"
             if self.normal_text_buffer.contains(end_token_without_newline) {
                 // Complete end token found - clean it and return
                 let cleaned_text = self

sgl-router/tests/tool_parser_json.rs

@@ -5,6 +5,9 @@
 use serde_json::json;
 use sglang_router_rs::tool_parser::{JsonParser, ToolParser};
 
+mod common;
+use common::{create_test_tools, streaming_helpers::*};
+
 #[tokio::test]
 async fn test_simple_json_tool_call() {
     let parser = JsonParser::new();
@@ -159,3 +162,556 @@ async fn test_json_format_detection() {
     assert!(parser.has_tool_markers(r#"[{"name": "test"}]"#));
     assert!(!parser.has_tool_markers("plain text"));
 }
+
+// Streaming tests for JSON array format
+#[tokio::test]
+async fn test_json_array_streaming_required_mode() {
+    use sglang_router_rs::protocols::common::Tool;
+
+    // Test that simulates the exact streaming pattern from required mode
+    let mut parser = JsonParser::new();
+
+    // Define test tools
+    let tools = vec![Tool {
+        tool_type: "function".to_string(),
+        function: sglang_router_rs::protocols::common::Function {
+            name: "get_weather".to_string(),
+            description: Some("Get weather".to_string()),
+            parameters: serde_json::json!({}),
+            strict: None,
+        },
+    }];
+
+    // Simulate the EXACT chunks from the debug log
+    let chunks = vec![
+        "[{",
+        " \"",
+        "name",
+        "\":",
+        " \"",
+        "get",
+        "_weather",
+        "\",",
+        " \"",
+        "parameters",
+        "\":",
+        " {",
+        " \"",
+        "city",
+        "\":",
+        " \"",
+        "Paris",
+        "\"",
+        " }",
+        " }]",
+    ];
+
+    let mut all_results = Vec::new();
+    let mut all_normal_text = String::new();
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
+        all_results.extend(result.calls);
+        all_normal_text.push_str(&result.normal_text);
+    }
+
+    // We should have gotten tool call chunks
+    assert!(
+        !all_results.is_empty(),
+        "Should have emitted tool call chunks"
+    );
+
+    // Should not have emitted any normal text (including the closing ])
+    assert_eq!(
+        all_normal_text, "",
+        "Should not emit normal text for JSON array format"
+    );
+
+    // Check that we got the function name
+    let has_name = all_results
+        .iter()
+        .any(|item| item.name.as_ref().is_some_and(|n| n == "get_weather"));
+    assert!(has_name, "Should have emitted function name");
+
+    // Check that we got the parameters
+    let has_params = all_results.iter().any(|item| !item.parameters.is_empty());
+    assert!(has_params, "Should have emitted parameters");
+}
+
+#[tokio::test]
+async fn test_json_array_multiple_tools_streaming() {
+    use sglang_router_rs::protocols::common::Tool;
+
+    // Test with multiple tools in array
+    let mut parser = JsonParser::new();
+
+    let tools = vec![
+        Tool {
+            tool_type: "function".to_string(),
+            function: sglang_router_rs::protocols::common::Function {
+                name: "get_weather".to_string(),
+                description: Some("Get weather".to_string()),
+                parameters: serde_json::json!({}),
+                strict: None,
+            },
+        },
+        Tool {
+            tool_type: "function".to_string(),
+            function: sglang_router_rs::protocols::common::Function {
+                name: "get_news".to_string(),
+                description: Some("Get news".to_string()),
+                parameters: serde_json::json!({}),
+                strict: None,
+            },
+        },
+    ];
+
+    // Split into smaller, more realistic chunks
+    let chunks = vec![
+        "[{",
+        "\"name\":",
+        "\"get_weather\"",
+        ",\"parameters\":",
+        "{\"city\":",
+        "\"SF\"}",
+        "}",
+        ",",
+        "{\"name\":",
+        "\"get_news\"",
+        ",\"parameters\":",
+        "{\"topic\":",
+        "\"tech\"}",
+        "}]",
+    ];
+
+    let mut all_results = Vec::new();
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
+        all_results.extend(result.calls);
+    }
+
+    // Should have gotten tool calls for both functions
+    let has_weather = all_results
+        .iter()
+        .any(|item| item.name.as_ref().is_some_and(|n| n == "get_weather"));
+    let has_news = all_results
+        .iter()
+        .any(|item| item.name.as_ref().is_some_and(|n| n == "get_news"));
+
+    assert!(has_weather, "Should have get_weather tool call");
+    assert!(has_news, "Should have get_news tool call");
+}
+
+#[tokio::test]
+async fn test_json_array_closing_bracket_separate_chunk() {
+    use sglang_router_rs::protocols::common::Tool;
+
+    // Test case where the closing ] comes as a separate chunk
+    let mut parser = JsonParser::new();
+
+    let tools = vec![Tool {
+        tool_type: "function".to_string(),
+        function: sglang_router_rs::protocols::common::Function {
+            name: "get_weather".to_string(),
+            description: Some("Get weather".to_string()),
+            parameters: json!({}),
+            strict: None,
+        },
+    }];
+
+    // Closing ] as separate chunk, followed by normal text
+    let chunks = vec![
+        "[{",
+        "\"",
+        "name",
+        "\":",
+        "\"",
+        "get",
+        "_weather",
+        "\",",
+        "\"",
+        "parameters",
+        "\":",
+        "{",
+        "\"",
+        "city",
+        "\":",
+        "\"",
+        "Paris",
+        "\"",
+        "}",
+        "}",
+        "]",
+        " Here's",
+        " the",
+        " weather",
+        " info",
+    ];
+
+    let mut all_normal_text = String::new();
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
+        all_normal_text.push_str(&result.normal_text);
+    }
+
+    // Should emit only the third chunk as normal text, NOT the ]
+    assert_eq!(
+        all_normal_text, " Here's the weather info",
+        "Should emit only normal text without ], got: '{}'",
+        all_normal_text
+    );
+}
+
+#[tokio::test]
+async fn test_json_single_object_with_trailing_text() {
+    use sglang_router_rs::protocols::common::Tool;
+
+    // Test single object format (no array) with trailing text
+    let mut parser = JsonParser::new();
+
+    let tools = vec![Tool {
+        tool_type: "function".to_string(),
+        function: sglang_router_rs::protocols::common::Function {
+            name: "get_weather".to_string(),
+            description: Some("Get weather".to_string()),
+            parameters: serde_json::json!({}),
+            strict: None,
+        },
+    }];
+
+    let chunks = vec![
+        "{",
+        "\"",
+        "name",
+        "\":",
+        "\"",
+        "get_weather",
+        "\",",
+        "\"",
+        "parameters",
+        "\":",
+        "{",
+        "\"city",
+        "\":",
+        "\"Paris",
+        "\"}",
+        "}",
+        " Here's",
+        " the",
+        " weather",
+    ];
+
+    let mut all_normal_text = String::new();
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
+        all_normal_text.push_str(&result.normal_text);
+    }
+
+    // Should emit the trailing text as normal_text (no ] to strip for single object)
+    assert_eq!(
+        all_normal_text, " Here's the weather",
+        "Should emit normal text for single object format, got: '{}'",
+        all_normal_text
+    );
+}
+
+#[tokio::test]
+async fn test_json_single_object_with_bracket_in_text() {
+    use sglang_router_rs::protocols::common::Tool;
+
+    // Test that ] in normal text is NOT stripped for single object format
+    let mut parser = JsonParser::new();
+
+    let tools = vec![Tool {
+        tool_type: "function".to_string(),
+        function: sglang_router_rs::protocols::common::Function {
+            name: "get_weather".to_string(),
+            description: Some("Get weather".to_string()),
+            parameters: serde_json::json!({}),
+            strict: None,
+        },
+    }];
+
+    let chunks = vec![
+        "{",
+        "\"name",
+        "\":",
+        "\"get_weather",
+        "\",",
+        "\"parameters",
+        "\":",
+        "{",
+        "\"city",
+        "\":",
+        "\"Paris",
+        "\"}",
+        "}",
+        "]",
+        " Here's",
+        " the",
+        " weather",
+    ];
+
+    let mut all_normal_text = String::new();
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
+        all_normal_text.push_str(&result.normal_text);
+    }
+
+    // For single object format, ] should NOT be stripped (it's part of normal text)
+    assert_eq!(
+        all_normal_text, "] Here's the weather",
+        "Should preserve ] in normal text for single object format, got: '{}'",
+        all_normal_text
+    );
+}
+
+#[tokio::test]
+async fn test_json_array_bracket_in_text_after_tools() {
+    use sglang_router_rs::protocols::common::Tool;
+
+    // Test that ] in normal text AFTER array tools is preserved
+    let mut parser = JsonParser::new();
+
+    let tools = vec![Tool {
+        tool_type: "function".to_string(),
+        function: sglang_router_rs::protocols::common::Function {
+            name: "get_weather".to_string(),
+            description: Some("Get weather".to_string()),
+            parameters: serde_json::json!({}),
+            strict: None,
+        },
+    }];
+
+    let chunks = vec![
+        "[",
+        "{",
+        "\"name",
+        "\":",
+        "\"get_weather",
+        "\",",
+        "\"parameters",
+        "\":",
+        "{",
+        "\"city",
+        "\":",
+        "\"Paris",
+        "\"}",
+        "}",
+        "]",
+        " Array",
+        " notation:",
+        " arr",
+        "[",
+        "0",
+        "]",
+    ];
+
+    let mut all_normal_text = String::new();
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
+        all_normal_text.push_str(&result.normal_text);
+    }
+
+    // Should preserve ] in normal text after array tools complete
+    assert_eq!(
+        all_normal_text, " Array notation: arr[0]",
+        "Should preserve ] in normal text after array tools, got: '{}'",
+        all_normal_text
+    );
+}
+// =============================================================================
+// REALISTIC STREAMING TESTS
+// =============================================================================
+
+#[tokio::test]
+async fn test_json_bug_incomplete_tool_name_string() {
+    let tools = create_test_tools();
+    let mut parser = JsonParser::new();
+
+    // This exact sequence triggered the bug:
+    // Parser receives {"name": " and must NOT parse it as empty name
+    let chunks = vec![
+        r#"{"#,
+        r#"""#,
+        r#"name"#,
+        r#"""#,
+        r#":"#,
+        r#" "#,
+        r#"""#, // ← Critical moment: parser has {"name": "
+        // At this point, partial_json should NOT allow incomplete strings
+        // when current_tool_name_sent=false
+        r#"search"#, // Use valid tool name from create_test_tools()
+        r#"""#,
+        r#", "#,
+        r#"""#,
+        r#"arguments"#,
+        r#"""#,
+        r#": {"#,
+        r#"""#,
+        r#"query"#,
+        r#"""#,
+        r#": "#,
+        r#"""#,
+        r#"rust programming"#,
+        r#"""#,
+        r#"}}"#,
+    ];
+
+    let mut got_tool_name = false;
+    let mut saw_empty_name = false;
+
+    for chunk in chunks.iter() {
+        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
+
+        for call in result.calls {
+            if let Some(name) = &call.name {
+                if name.is_empty() {
+                    saw_empty_name = true;
+                }
+                if name == "search" {
+                    got_tool_name = true;
+                }
+            }
+        }
+    }
+
+    assert!(
+        !saw_empty_name,
+        "Parser should NEVER return empty tool name"
+    );
+    assert!(got_tool_name, "Should have parsed tool name correctly");
+}
+
+#[tokio::test]
+async fn test_json_realistic_chunks_simple_tool() {
+    let tools = create_test_tools();
+    let mut parser = JsonParser::new();
+
+    let input = r#"{"name": "get_weather", "arguments": {"city": "Paris"}}"#;
+    let chunks = create_realistic_chunks(input);
+
+    assert!(chunks.len() > 10, "Should have many small chunks");
+
+    let mut got_tool_name = false;
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
+        for call in result.calls {
+            if let Some(name) = call.name {
+                assert_eq!(name, "get_weather");
+                got_tool_name = true;
+            }
+        }
+    }
+
+    assert!(got_tool_name, "Should have parsed tool name");
+}
+
+#[tokio::test]
+async fn test_json_strategic_chunks_with_quotes() {
+    let tools = create_test_tools();
+    let mut parser = JsonParser::new();
+
+    let input = r#"{"name": "search", "arguments": {"query": "rust programming"}}"#;
+    let chunks = create_strategic_chunks(input);
+
+    // Strategic chunks break after quotes and colons
+    assert!(chunks.iter().any(|c| c.ends_with('"')));
+
+    let mut got_tool_name = false;
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
+        for call in result.calls {
+            if call.name.is_some() {
+                got_tool_name = true;
+            }
+        }
+    }
+
+    assert!(got_tool_name, "Should have parsed tool name");
+}
+
+#[tokio::test]
+async fn test_json_incremental_arguments_streaming() {
+    let tools = create_test_tools();
+    let mut parser = JsonParser::new();
+
+    let input = r#"{"name": "search", "arguments": {"query": "test", "limit": 10}}"#;
+    let chunks = create_realistic_chunks(input);
+
+    let mut tool_name_sent = false;
+    let mut got_arguments = false;
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
+        for call in result.calls {
+            if call.name.is_some() {
+                tool_name_sent = true;
+            }
+            if tool_name_sent && !call.parameters.is_empty() {
+                got_arguments = true;
+            }
+        }
+    }
+
+    assert!(tool_name_sent, "Should have sent tool name");
+    assert!(got_arguments, "Should have sent arguments");
+}
+
+#[tokio::test]
+async fn test_json_very_long_url_in_arguments() {
+    let tools = create_test_tools();
+    let mut parser = JsonParser::new();
+
+    // Simulate long URL arriving in many chunks
+    let long_url = "https://example.com/very/long/path/".to_string() + &"segment/".repeat(50);
+    let input = format!(
+        r#"{{"name": "search", "arguments": {{"query": "{}"}}}}"#,
+        long_url
+    );
+    let chunks = create_realistic_chunks(&input);
+
+    assert!(chunks.len() > 100, "Long URL should create many chunks");
+
+    let mut got_tool_name = false;
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
+        for call in result.calls {
+            if call.name.is_some() {
+                got_tool_name = true;
+            }
+        }
+    }
+
+    assert!(got_tool_name, "Should have parsed tool name");
+}
+
+#[tokio::test]
+async fn test_json_unicode() {
+    let tools = create_test_tools();
+    let mut parser = JsonParser::new();
+
+    let input = r#"{"name": "search", "arguments": {"query": "Hello 世界 🌍"}}"#;
+    let chunks = create_realistic_chunks(input);
+
+    let mut got_tool_name = false;
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
+        for call in result.calls {
+            if call.name.is_some() {
+                got_tool_name = true;
+            }
+        }
+    }
+
+    assert!(got_tool_name, "Should have parsed with unicode");
+}

sgl-router/tests/tool_parser_llama.rs

@@ -5,7 +5,7 @@
 use sglang_router_rs::tool_parser::{LlamaParser, ToolParser};
 
 mod common;
-use common::create_test_tools;
+use common::{create_test_tools, streaming_helpers::*};
 
 #[tokio::test]
 async fn test_llama_python_tag_format() {
@@ -397,3 +397,59 @@ async fn test_llama_streaming_multiple_tools_chunked() {
         }
     }
 }
+
+// =============================================================================
+// REALISTIC STREAMING TESTS
+// =============================================================================
+
+#[tokio::test]
+async fn test_llama_realistic_chunks_with_python_tag() {
+    let tools = create_test_tools();
+    let mut parser = LlamaParser::new();
+
+    let input = r#"<|python_tag|>{"name": "calculate", "parameters": {"x": 10, "y": 20}}"#;
+    let chunks = create_realistic_chunks(input);
+
+    assert!(chunks.len() > 15, "Should have many small chunks");
+
+    let mut got_tool_name = false;
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
+        for call in result.calls {
+            if let Some(name) = call.name {
+                assert_eq!(name, "calculate");
+                got_tool_name = true;
+            }
+        }
+    }
+
+    assert!(got_tool_name, "Should have parsed tool name");
+}
+
+#[tokio::test]
+async fn test_llama_python_tag_arrives_in_parts() {
+    let tools = create_test_tools();
+    let mut parser = LlamaParser::new();
+
+    // Python tag itself arrives in small chunks
+    let chunks = vec![
+        "<|p", "yth", "on_", "tag", "|>{", r#"""#, "na", r#"me""#, ": ", r#"""#, "sea", "rch",
+        r#"""#, ", ", r#"""#, "par", "ame", "ter", "s", r#"""#, ": {", r#"""#, "q", r#"""#, ": ",
+        r#"""#, "tes", "t", r#"""#, "}}",
+    ];
+
+    let mut got_tool_name = false;
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
+        for call in result.calls {
+            if let Some(name) = call.name {
+                assert_eq!(name, "search");
+                got_tool_name = true;
+            }
+        }
+    }
+
+    assert!(got_tool_name, "Should have parsed tool name");
+}

sgl-router/tests/tool_parser_mistral.rs

@@ -155,3 +155,120 @@ Let me execute these searches for you."#;
     assert_eq!(tools[0].function.name, "web_search");
     assert_eq!(tools[1].function.name, "get_weather");
 }
+
+#[tokio::test]
+async fn test_mistral_streaming_closing_bracket() {
+    use sglang_router_rs::protocols::common::Tool;
+
+    // Test that closing ] is stripped for Mistral array format
+    let mut parser = MistralParser::new();
+
+    let tools = vec![Tool {
+        tool_type: "function".to_string(),
+        function: sglang_router_rs::protocols::common::Function {
+            name: "get_weather".to_string(),
+            description: Some("Get weather".to_string()),
+            parameters: json!({}),
+            strict: None,
+        },
+    }];
+
+    let chunks = vec![
+        "[TOOL_CALLS] ",
+        "[{",
+        "\"",
+        "name",
+        "\":",
+        "\"",
+        "get",
+        "_weather",
+        "\",",
+        "\"",
+        "arguments",
+        "\":",
+        "{",
+        "\"",
+        "city",
+        "\":",
+        "\"",
+        "Paris",
+        "\"",
+        "}",
+        "}",
+        "]",
+        " Here's",
+        " the weather",
+        " info",
+    ];
+
+    let mut all_normal_text = String::new();
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
+        all_normal_text.push_str(&result.normal_text);
+    }
+
+    // Should emit only the third chunk as normal text, NOT the ]
+    assert_eq!(
+        all_normal_text, " Here's the weather info",
+        "Should not emit ] for Mistral array format, got: '{}'",
+        all_normal_text
+    );
+}
+
+#[tokio::test]
+async fn test_mistral_streaming_bracket_in_text_after_tools() {
+    use sglang_router_rs::protocols::common::Tool;
+
+    // Test that ] in normal text AFTER tool calls is preserved
+    let mut parser = MistralParser::new();
+
+    let tools = vec![Tool {
+        tool_type: "function".to_string(),
+        function: sglang_router_rs::protocols::common::Function {
+            name: "get_weather".to_string(),
+            description: Some("Get weather".to_string()),
+            parameters: json!({}),
+            strict: None,
+        },
+    }];
+
+    let chunks = vec![
+        "[TOOL_CALLS] ",
+        "[",
+        "{",
+        "\"name",
+        "\":",
+        "\"get_weather",
+        "\",",
+        "\"arguments",
+        "\":",
+        "{\"",
+        "city",
+        "\":",
+        "\"Paris",
+        "\"}",
+        "}",
+        "]",
+        " Array",
+        " notation:",
+        " arr",
+        "[",
+        "0",
+        "]",
+    ];
+
+    let mut all_normal_text = String::new();
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
+        all_normal_text.push_str(&result.normal_text);
+    }
+
+    // Should preserve ] in normal text after tools complete
+    assert_eq!(
+        all_normal_text, " Array notation: arr[0]",
+        "Should preserve ] in normal text after tools, got: '{}'",
+        all_normal_text
+    );
+}

sgl-router/tests/tool_parser_qwen.rs

@@ -6,7 +6,7 @@ use serde_json::json;
 use sglang_router_rs::tool_parser::{QwenParser, ToolParser};
 
 mod common;
-use common::create_test_tools;
+use common::{create_test_tools, streaming_helpers::*};
 
 #[tokio::test]
 async fn test_qwen_single_tool() {
@@ -250,3 +250,58 @@ async fn test_buffer_efficiency_with_multiple_tools() {
         }
     }
 }
+
+// =============================================================================
+// REALISTIC STREAMING TESTS
+// =============================================================================
+
+#[tokio::test]
+async fn test_qwen_realistic_chunks_with_xml_tags() {
+    let tools = create_test_tools();
+    let mut parser = QwenParser::new();
+
+    let input = "<tool_call>\n{\"name\": \"get_weather\", \"arguments\": {\"city\": \"Tokyo\"}}\n</tool_call>";
+    let chunks = create_realistic_chunks(input);
+
+    assert!(chunks.len() > 20, "Should have many small chunks");
+
+    let mut got_tool_name = false;
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
+        for call in result.calls {
+            if let Some(name) = call.name {
+                assert_eq!(name, "get_weather");
+                got_tool_name = true;
+            }
+        }
+    }
+
+    assert!(got_tool_name, "Should have parsed tool name");
+}
+
+#[tokio::test]
+async fn test_qwen_xml_tag_arrives_in_parts() {
+    let tools = create_test_tools();
+    let mut parser = QwenParser::new();
+
+    let chunks = vec![
+        "<to", "ol_", "cal", "l>\n", "{", r#"""#, "na", "me", r#"""#, ": ", r#"""#, "tra", "nsl",
+        "ate", r#"""#, ", ", r#"""#, "arg", "ume", "nts", r#"""#, ": {", r#"""#, "tex", "t",
+        r#"""#, ": ", r#"""#, "hel", "lo", r#"""#, "}}\n", "</t", "ool", "_ca", "ll>",
+    ];
+
+    let mut got_tool_name = false;
+
+    for chunk in chunks {
+        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
+        for call in result.calls {
+            if let Some(name) = call.name {
+                assert_eq!(name, "translate");
+                got_tool_name = true;
+            }
+        }
+    }
+
+    assert!(got_tool_name, "Should have parsed tool name");
+}

sgl-router/tests/tool_parser_streaming.rs

-//! Realistic Streaming Parser Tests
-//!
-//! Tests incremental parsing with realistic char-level chunks (2-5 chars)
-//! that simulate how LLM tokens actually arrive.
-//!
-//! These tests are designed to catch bugs like `{"name": "` being parsed
-//! as an empty tool name.
-
-use sglang_router_rs::tool_parser::{JsonParser, LlamaParser, QwenParser, ToolParser};
-
-mod common;
-use common::{create_test_tools, streaming_helpers::*};
-
-// =============================================================================
-// THE BUG SCENARIO - Most Critical Test
-// =============================================================================
-
-#[tokio::test]
-async fn test_json_bug_incomplete_tool_name_string() {
-    let tools = create_test_tools();
-    let mut parser = JsonParser::new();
-
-    // This exact sequence triggered the bug:
-    // Parser receives {"name": " and must NOT parse it as empty name
-    let chunks = vec![
-        r#"{"#,
-        r#"""#,
-        r#"name"#,
-        r#"""#,
-        r#":"#,
-        r#" "#,
-        r#"""#, // ← Critical moment: parser has {"name": "
-        // At this point, partial_json should NOT allow incomplete strings
-        // when current_tool_name_sent=false
-        r#"search"#, // Use valid tool name from create_test_tools()
-        r#"""#,
-        r#", "#,
-        r#"""#,
-        r#"arguments"#,
-        r#"""#,
-        r#": {"#,
-        r#"""#,
-        r#"query"#,
-        r#"""#,
-        r#": "#,
-        r#"""#,
-        r#"rust programming"#,
-        r#"""#,
-        r#"}}"#,
-    ];
-
-    let mut got_tool_name = false;
-    let mut saw_empty_name = false;
-
-    for chunk in chunks.iter() {
-        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
-
-        for call in result.calls {
-            if let Some(name) = &call.name {
-                if name.is_empty() {
-                    saw_empty_name = true;
-                }
-                if name == "search" {
-                    got_tool_name = true;
-                }
-            }
-        }
-    }
-
-    assert!(
-        !saw_empty_name,
-        "Parser should NEVER return empty tool name"
-    );
-    assert!(got_tool_name, "Should have parsed tool name correctly");
-}
-
-// =============================================================================
-// JSON PARSER REALISTIC STREAMING
-// =============================================================================
-
-#[tokio::test]
-async fn test_json_realistic_chunks_simple_tool() {
-    let tools = create_test_tools();
-    let mut parser = JsonParser::new();
-
-    let input = r#"{"name": "get_weather", "arguments": {"city": "Paris"}}"#;
-    let chunks = create_realistic_chunks(input);
-
-    assert!(chunks.len() > 10, "Should have many small chunks");
-
-    let mut got_tool_name = false;
-
-    for chunk in chunks {
-        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
-        for call in result.calls {
-            if let Some(name) = call.name {
-                assert_eq!(name, "get_weather");
-                got_tool_name = true;
-            }
-        }
-    }
-
-    assert!(got_tool_name, "Should have parsed tool name");
-}
-
-#[tokio::test]
-async fn test_json_strategic_chunks_with_quotes() {
-    let tools = create_test_tools();
-    let mut parser = JsonParser::new();
-
-    let input = r#"{"name": "search", "arguments": {"query": "rust programming"}}"#;
-    let chunks = create_strategic_chunks(input);
-
-    // Strategic chunks break after quotes and colons
-    assert!(chunks.iter().any(|c| c.ends_with('"')));
-
-    let mut got_tool_name = false;
-
-    for chunk in chunks {
-        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
-        for call in result.calls {
-            if call.name.is_some() {
-                got_tool_name = true;
-            }
-        }
-    }
-
-    assert!(got_tool_name, "Should have parsed tool name");
-}
-
-#[tokio::test]
-async fn test_json_incremental_arguments_streaming() {
-    let tools = create_test_tools();
-    let mut parser = JsonParser::new();
-
-    let input = r#"{"name": "search", "arguments": {"query": "test", "limit": 10}}"#;
-    let chunks = create_realistic_chunks(input);
-
-    let mut tool_name_sent = false;
-    let mut got_arguments = false;
-
-    for chunk in chunks {
-        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
-        for call in result.calls {
-            if call.name.is_some() {
-                tool_name_sent = true;
-            }
-            if tool_name_sent && !call.parameters.is_empty() {
-                got_arguments = true;
-            }
-        }
-    }
-
-    assert!(tool_name_sent, "Should have sent tool name");
-    assert!(got_arguments, "Should have sent arguments");
-}
-
-// =============================================================================
-// LLAMA PARSER REALISTIC STREAMING
-// =============================================================================
-
-#[tokio::test]
-async fn test_llama_realistic_chunks_with_python_tag() {
-    let tools = create_test_tools();
-    let mut parser = LlamaParser::new();
-
-    let input = r#"<|python_tag|>{"name": "calculate", "parameters": {"x": 10, "y": 20}}"#;
-    let chunks = create_realistic_chunks(input);
-
-    assert!(chunks.len() > 15, "Should have many small chunks");
-
-    let mut got_tool_name = false;
-
-    for chunk in chunks {
-        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
-        for call in result.calls {
-            if let Some(name) = call.name {
-                assert_eq!(name, "calculate");
-                got_tool_name = true;
-            }
-        }
-    }
-
-    assert!(got_tool_name, "Should have parsed tool name");
-}
-
-#[tokio::test]
-async fn test_llama_python_tag_arrives_in_parts() {
-    let tools = create_test_tools();
-    let mut parser = LlamaParser::new();
-
-    // Python tag itself arrives in small chunks
-    let chunks = vec![
-        "<|p", "yth", "on_", "tag", "|>{", r#"""#, "na", r#"me""#, ": ", r#"""#, "sea", "rch",
-        r#"""#, ", ", r#"""#, "par", "ame", "ter", "s", r#"""#, ": {", r#"""#, "q", r#"""#, ": ",
-        r#"""#, "tes", "t", r#"""#, "}}",
-    ];
-
-    let mut got_tool_name = false;
-
-    for chunk in chunks {
-        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
-        for call in result.calls {
-            if let Some(name) = call.name {
-                assert_eq!(name, "search");
-                got_tool_name = true;
-            }
-        }
-    }
-
-    assert!(got_tool_name, "Should have parsed tool name");
-}
-
-// =============================================================================
-// QWEN PARSER REALISTIC STREAMING
-// =============================================================================
-
-#[tokio::test]
-async fn test_qwen_realistic_chunks_with_xml_tags() {
-    let tools = create_test_tools();
-    let mut parser = QwenParser::new();
-
-    let input = "<tool_call>\n{\"name\": \"get_weather\", \"arguments\": {\"city\": \"Tokyo\"}}\n</tool_call>";
-    let chunks = create_realistic_chunks(input);
-
-    assert!(chunks.len() > 20, "Should have many small chunks");
-
-    let mut got_tool_name = false;
-
-    for chunk in chunks {
-        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
-        for call in result.calls {
-            if let Some(name) = call.name {
-                assert_eq!(name, "get_weather");
-                got_tool_name = true;
-            }
-        }
-    }
-
-    assert!(got_tool_name, "Should have parsed tool name");
-}
-
-#[tokio::test]
-async fn test_qwen_xml_tag_arrives_in_parts() {
-    let tools = create_test_tools();
-    let mut parser = QwenParser::new();
-
-    let chunks = vec![
-        "<to", "ol_", "cal", "l>\n", "{", r#"""#, "na", "me", r#"""#, ": ", r#"""#, "tra", "nsl",
-        "ate", r#"""#, ", ", r#"""#, "arg", "ume", "nts", r#"""#, ": {", r#"""#, "tex", "t",
-        r#"""#, ": ", r#"""#, "hel", "lo", r#"""#, "}}\n", "</t", "ool", "_ca", "ll>",
-    ];
-
-    let mut got_tool_name = false;
-
-    for chunk in chunks {
-        let result = parser.parse_incremental(chunk, &tools).await.unwrap();
-        for call in result.calls {
-            if let Some(name) = call.name {
-                assert_eq!(name, "translate");
-                got_tool_name = true;
-            }
-        }
-    }
-
-    assert!(got_tool_name, "Should have parsed tool name");
-}
-
-// =============================================================================
-// EDGE CASES WITH REALISTIC CHUNKS
-// =============================================================================
-
-#[tokio::test]
-async fn test_json_very_long_url_in_arguments() {
-    let tools = create_test_tools();
-    let mut parser = JsonParser::new();
-
-    // Simulate long URL arriving in many chunks
-    let long_url = "https://example.com/very/long/path/".to_string() + &"segment/".repeat(50);
-    let input = format!(
-        r#"{{"name": "search", "arguments": {{"query": "{}"}}}}"#,
-        long_url
-    );
-    let chunks = create_realistic_chunks(&input);
-
-    assert!(chunks.len() > 100, "Long URL should create many chunks");
-
-    let mut got_tool_name = false;
-
-    for chunk in chunks {
-        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
-        for call in result.calls {
-            if call.name.is_some() {
-                got_tool_name = true;
-            }
-        }
-    }
-
-    assert!(got_tool_name, "Should have parsed tool name");
-}
-
-#[tokio::test]
-async fn test_json_unicode_arrives_byte_by_byte() {
-    let tools = create_test_tools();
-    let mut parser = JsonParser::new();
-
-    let input = r#"{"name": "search", "arguments": {"query": "Hello 世界 🌍"}}"#;
-    let chunks = create_realistic_chunks(input);
-
-    let mut got_tool_name = false;
-
-    for chunk in chunks {
-        let result = parser.parse_incremental(&chunk, &tools).await.unwrap();
-        for call in result.calls {
-            if call.name.is_some() {
-                got_tool_name = true;
-            }
-        }
-    }
-
-    assert!(got_tool_name, "Should have parsed with unicode");
-}