use std::{
collections::VecDeque,
sync::{Arc, Mutex},
};
use async_trait::async_trait;
use super::*;
use crate::model::{ContextUsageSource, ModelProvider, ModelRequest, ModelResponse};
use crate::tool::{Tool, ToolCall, ToolSpec};
type RecordedRequests = Arc<Mutex<Vec<(String, Vec<Message>)>>>;
#[derive(Clone, Default)]
struct RecordingHistorySink {
appended: Arc<Mutex<Vec<Message>>>,
replaced: Arc<Mutex<Vec<Message>>>,
}
impl RecordingHistorySink {
fn append_target(target: Arc<Mutex<Vec<Message>>>) -> Self {
Self {
appended: target,
replaced: Arc::default(),
}
}
fn replace_target(target: Arc<Mutex<Vec<Message>>>) -> Self {
Self {
appended: Arc::default(),
replaced: target,
}
}
}
impl HistorySink for RecordingHistorySink {
fn append_message(&mut self, message: &Message) -> anyhow::Result<()> {
self.appended.lock().unwrap().push(message.clone());
Ok(())
}
fn replace_history(&mut self, messages: &[Message]) -> anyhow::Result<()> {
self.replaced
.lock()
.unwrap()
.extend(messages.iter().cloned());
Ok(())
}
}
#[derive(Clone, Default)]
struct RecordingProvider {
requests: Arc<Mutex<Vec<Vec<Message>>>>,
tools: Arc<Mutex<Vec<Vec<ToolSpec>>>>,
prompt_cache_keys: Arc<Mutex<Vec<Option<String>>>>,
response: Option<ModelResponse>,
}
#[async_trait(?Send)]
impl ModelProvider for RecordingProvider {
async fn send_turn(&self, request: ModelRequest) -> Result<ModelResponse, ModelError> {
self.prompt_cache_keys
.lock()
.unwrap()
.push(request.prompt_cache_key.clone());
self.tools.lock().unwrap().push(request.tools.clone());
self.requests.lock().unwrap().push(request.messages);
Ok(self
.response
.clone()
.unwrap_or_else(|| ModelResponse::Assistant(vec![ContentBlock::Text("ok".into())])))
}
}
fn test_agent(provider: RecordingProvider) -> Agent {
test_agent_with_tools(provider, ToolRegistry::new())
}
fn test_agent_with_tools(provider: impl ModelProvider + 'static, tools: ToolRegistry) -> Agent {
Agent::new(
Box::new(provider),
tools,
ToolContext {
cwd: std::env::current_dir().unwrap(),
max_output_bytes: 12000,
},
)
}
struct FailingProvider {
requests: Arc<Mutex<usize>>,
error: ModelError,
}
#[async_trait(?Send)]
impl ModelProvider for FailingProvider {
async fn send_turn(&self, _request: ModelRequest) -> Result<ModelResponse, ModelError> {
*self.requests.lock().unwrap() += 1;
Err(match &self.error {
ModelError::MissingApiKey => ModelError::MissingApiKey,
ModelError::InvalidResponse(message) => ModelError::InvalidResponse(message.clone()),
_ => unreachable!("test only clones selected errors"),
})
}
}
struct TransientInvalidResponseProvider {
requests: Arc<Mutex<usize>>,
}
#[async_trait(?Send)]
impl ModelProvider for TransientInvalidResponseProvider {
async fn send_turn(&self, _request: ModelRequest) -> Result<ModelResponse, ModelError> {
let mut requests = self.requests.lock().unwrap();
*requests += 1;
if *requests == 1 {
return Err(ModelError::InvalidResponse(
"temporary parse failure".into(),
));
}
Ok(ModelResponse::Assistant(vec![ContentBlock::Text(
"ok".into(),
)]))
}
}
struct SequencedProvider {
requests: Arc<Mutex<Vec<Vec<Message>>>>,
responses: Mutex<VecDeque<ModelResponse>>,
}
#[async_trait(?Send)]
impl ModelProvider for SequencedProvider {
async fn send_turn(&self, request: ModelRequest) -> Result<ModelResponse, ModelError> {
self.requests.lock().unwrap().push(request.messages);
Ok(self.responses.lock().unwrap().pop_front().unwrap())
}
}
struct UsageStreamingProvider;
#[async_trait(?Send)]
impl ModelProvider for UsageStreamingProvider {
async fn send_turn(&self, _request: ModelRequest) -> Result<ModelResponse, ModelError> {
unreachable!("streaming provider should use send_turn_stream")
}
async fn send_turn_stream(
&self,
_request: ModelRequest,
on_event: &mut dyn FnMut(ModelEvent) -> Result<(), ModelError>,
) -> Result<ModelResponse, ModelError> {
on_event(ModelEvent::Usage(ModelUsage {
input_tokens: Some(300),
cache_read_tokens: Some(700),
context_window: Some(10_000),
..ModelUsage::default()
}))?;
Ok(ModelResponse::Assistant(vec![ContentBlock::Text(
"ok".into(),
)]))
}
}
struct CompactingProvider {
requests: RecordedRequests,
}
#[async_trait(?Send)]
impl ModelProvider for CompactingProvider {
async fn send_turn(&self, request: ModelRequest) -> Result<ModelResponse, ModelError> {
self.requests
.lock()
.unwrap()
.push(("summary".into(), request.messages));
Ok(ModelResponse::Assistant(vec![ContentBlock::Text(
"compacted summary".into(),
)]))
}
async fn send_turn_stream(
&self,
request: ModelRequest,
on_event: &mut dyn FnMut(ModelEvent) -> Result<(), ModelError>,
) -> Result<ModelResponse, ModelError> {
let is_summary_request = matches!(
request.messages.first(),
Some(Message::System(text)) if text.starts_with("Summarize the conversation history")
);
if is_summary_request {
self.requests
.lock()
.unwrap()
.push(("summary".into(), request.messages));
on_event(ModelEvent::Usage(ModelUsage {
input_tokens: Some(100),
output_tokens: Some(20),
..ModelUsage::default()
}))?;
return Ok(ModelResponse::Assistant(vec![ContentBlock::Text(
"compacted summary".into(),
)]));
}
self.requests
.lock()
.unwrap()
.push(("normal".into(), request.messages));
on_event(ModelEvent::Usage(ModelUsage {
input_tokens: Some(900),
..ModelUsage::default()
}))?;
Ok(ModelResponse::Assistant(vec![ContentBlock::Text(
"ok".into(),
)]))
}
}
struct OkTool;
#[async_trait]
impl Tool for OkTool {
fn spec(&self) -> ToolSpec {
ToolSpec {
name: "ok_tool".into(),
description: "test tool".into(),
input_schema: serde_json::json!({"type": "object"}),
}
}
async fn call(
&self,
_args: serde_json::Value,
_ctx: ToolContext,
id: String,
) -> Result<ToolResult, ToolError> {
Ok(ToolResult {
id,
ok: true,
content: "tool ok".into(),
})
}
}
struct FailingTool;
#[async_trait]
impl Tool for FailingTool {
fn spec(&self) -> ToolSpec {
ToolSpec {
name: "failing_tool".into(),
description: "test failing tool".into(),
input_schema: serde_json::json!({"type": "object"}),
}
}
async fn call(
&self,
_args: serde_json::Value,
_ctx: ToolContext,
_id: String,
) -> Result<ToolResult, ToolError> {
Err(ToolError::Message("tool failed".into()))
}
}
#[tokio::test]
async fn does_not_retry_non_recoverable_provider_errors() {
let requests = Arc::new(Mutex::new(0));
let mut agent = Agent::new(
Box::new(FailingProvider {
requests: requests.clone(),
error: ModelError::MissingApiKey,
}),
ToolRegistry::new(),
ToolContext {
cwd: std::env::current_dir().unwrap(),
max_output_bytes: 12000,
},
);
let err = agent.run("hello".into()).await.unwrap_err();
assert!(matches!(
err,
AgentError::Provider(ModelError::MissingApiKey)
));
assert_eq!(*requests.lock().unwrap(), 1);
}
#[tokio::test]
async fn retries_recoverable_invalid_response_errors() {
let requests = Arc::new(Mutex::new(0));
let mut agent = Agent::new(
Box::new(TransientInvalidResponseProvider {
requests: requests.clone(),
}),
ToolRegistry::new(),
ToolContext {
cwd: std::env::current_dir().unwrap(),
max_output_bytes: 12000,
},
);
let output = agent.run("hello".into()).await.unwrap();
assert_eq!(output, "ok");
assert_eq!(*requests.lock().unwrap(), 2);
}
#[test]
fn load_skill_truncates_contents_before_persisting() {
let root = tempfile::tempdir().unwrap();
let skill = crate::skills::Skill {
name: "long-skill".into(),
description: "long skill".into(),
path: root.path().join(".agents/skills/long-skill/SKILL.md"),
contents: "abcdefghijklmnopqrstuvwxyz".into(),
};
let persisted = Arc::new(Mutex::new(Vec::new()));
let mut agent = Agent::new(
Box::new(RecordingProvider::default()),
ToolRegistry::new(),
ToolContext {
cwd: root.path().to_path_buf(),
max_output_bytes: 8,
},
);
agent.set_history_sink(RecordingHistorySink::append_target(persisted.clone()));
agent.load_skill(&skill).unwrap();
let persisted = persisted.lock().unwrap();
let Message::User(blocks) = persisted.last().unwrap() else {
panic!("expected persisted user message");
};
let [ContentBlock::Text(text)] = blocks.as_slice() else {
panic!("expected single text block");
};
assert!(text.contains("abcdefgh\n[truncated]"));
assert!(!text.contains("ijklmnopqrstuvwxyz"));
}
#[tokio::test]
async fn includes_session_derived_prompt_cache_key_in_model_requests() {
let provider = RecordingProvider::default();
let prompt_cache_keys = provider.prompt_cache_keys.clone();
let mut agent = test_agent(provider);
agent.set_session_id(Some("session / one".into()));
agent.run("first".into()).await.unwrap();
agent.set_session_id(None);
agent.run("second".into()).await.unwrap();
assert_eq!(
*prompt_cache_keys.lock().unwrap(),
vec![Some("rho:session-one".into()), None]
);
}
#[tokio::test]
async fn emits_estimated_context_usage_before_provider_call() {
let mut agent = test_agent(RecordingProvider::default());
let mut context_events = Vec::new();
agent
.run_with_events("hello".into(), |event| {
if let AgentEvent::ContextUsage(usage) = event {
context_events.push(usage);
}
Ok(())
})
.await
.unwrap();
assert_eq!(context_events.len(), 1);
assert_eq!(context_events[0].source, ContextUsageSource::Estimated);
assert!(context_events[0].tokens.unwrap() > 0);
}
#[tokio::test]
async fn emits_provider_reported_context_usage_from_model_usage() {
let mut agent = test_agent_with_tools(UsageStreamingProvider, ToolRegistry::new());
let mut context_events = Vec::new();
agent
.run_with_events("hello".into(), |event| {
if let AgentEvent::ContextUsage(usage) = event {
context_events.push(usage);
}
Ok(())
})
.await
.unwrap();
assert_eq!(context_events.len(), 2);
assert_eq!(context_events[0].source, ContextUsageSource::Estimated);
assert_eq!(
context_events[1].source,
ContextUsageSource::ProviderReported
);
assert_eq!(context_events[1].tokens, Some(1_000));
assert_eq!(context_events[1].context_window, Some(10_000));
}
#[tokio::test]
async fn compacts_history_before_normal_provider_call_when_threshold_is_exceeded_with_configured_context_window(
) {
let requests = Arc::new(Mutex::new(Vec::new()));
let mut agent = test_agent_with_tools(
CompactingProvider {
requests: requests.clone(),
},
ToolRegistry::new(),
);
agent.set_compaction_config(CompactionConfig {
auto_compact: true,
threshold_percent: 1,
recent_messages: 1,
});
agent.set_context_window(Some(1_000));
agent.run("first".into()).await.unwrap();
agent.run("second".into()).await.unwrap();
let requests = requests.lock().unwrap();
assert_eq!(requests.len(), 3);
assert_eq!(requests[0].0, "normal");
assert_eq!(requests[1].0, "summary");
assert_eq!(requests[2].0, "normal");
assert!(matches!(
requests[1].1.as_slice(),
[Message::System(_), Message::User(_)]
));
assert!(requests[2].1.iter().any(|message| {
matches!(message, Message::User(blocks) if matches!(blocks.as_slice(), [ContentBlock::Text(text)] if text.contains("compacted summary")))
}));
assert!(
matches!(requests[2].1.last(), Some(Message::User(blocks)) if matches!(blocks.as_slice(), [ContentBlock::Text(text)] if text == "second"))
);
}
#[tokio::test]
async fn emits_usage_for_compaction_summary_request() {
let requests = Arc::new(Mutex::new(Vec::new()));
let mut agent = test_agent_with_tools(
CompactingProvider {
requests: requests.clone(),
},
ToolRegistry::new(),
);
agent.set_compaction_config(CompactionConfig {
auto_compact: true,
threshold_percent: 1,
recent_messages: 1,
});
agent.set_context_window(Some(1_000));
let mut usage_events = Vec::new();
agent
.run_with_events("first".into(), |_| Ok(()))
.await
.unwrap();
agent
.run_with_events("second".into(), |event| {
if let AgentEvent::Usage(usage) = event {
usage_events.push(usage);
}
Ok(())
})
.await
.unwrap();
assert!(usage_events
.iter()
.any(|usage| { usage.input_tokens == Some(100) && usage.output_tokens == Some(20) }));
}
#[tokio::test]
async fn compacts_after_tool_results_before_next_provider_call() {
let requests = Arc::new(Mutex::new(Vec::new()));
let response = ModelResponse::Assistant(vec![ContentBlock::ToolCall(ToolCall {
id: "call_1".into(),
name: "ok_tool".into(),
arguments: serde_json::json!({}),
})]);
let provider = SequencedProvider {
requests: requests.clone(),
responses: Mutex::new(VecDeque::from([
response,
ModelResponse::Assistant(vec![ContentBlock::Text("summary".into())]),
ModelResponse::Assistant(vec![ContentBlock::Text("recovered".into())]),
])),
};
let mut tools = ToolRegistry::new();
tools.register(OkTool);
let mut agent = test_agent_with_tools(provider, tools);
agent.set_compaction_config(CompactionConfig {
auto_compact: true,
threshold_percent: 1,
recent_messages: 1,
});
agent.set_context_window(Some(1));
let output = agent.run("run tool".into()).await.unwrap();
assert_eq!(output, "recovered");
let requests = requests.lock().unwrap();
assert_eq!(requests.len(), 3);
assert!(matches!(
requests[1].as_slice(),
[Message::System(_), Message::User(_)]
));
assert!(requests[2].iter().any(|message| {
matches!(message, Message::User(blocks) if matches!(blocks.as_slice(), [ContentBlock::Text(text)] if text.contains("summary")))
}));
}
#[tokio::test]
async fn unknown_after_compaction_is_not_overwritten_by_estimate_before_provider_usage() {
let mut agent = test_agent_with_tools(
SequencedProvider {
requests: Arc::new(Mutex::new(Vec::new())),
responses: Mutex::new(VecDeque::from(vec![
ModelResponse::Assistant(vec![ContentBlock::Text("first ok".into())]),
ModelResponse::Assistant(vec![ContentBlock::Text("summary".into())]),
ModelResponse::Assistant(vec![ContentBlock::Text("second ok".into())]),
])),
},
ToolRegistry::new(),
);
agent.set_compaction_config(CompactionConfig {
auto_compact: true,
threshold_percent: 1,
recent_messages: 1,
});
agent.set_context_window(Some(1_000));
let mut context_events = Vec::new();
agent
.run_with_events("first".into(), |event| {
if let AgentEvent::ContextUsage(usage) = event {
context_events.push(usage);
}
Ok(())
})
.await
.unwrap();
agent
.run_with_events("second".into(), |event| {
if let AgentEvent::ContextUsage(usage) = event {
context_events.push(usage);
}
Ok(())
})
.await
.unwrap();
assert_eq!(context_events.len(), 2);
assert_eq!(context_events[0].source, ContextUsageSource::Estimated);
assert_eq!(context_events[0].context_window, Some(1_000));
assert_eq!(
context_events[1].source,
ContextUsageSource::UnknownAfterCompaction
);
assert_eq!(context_events[1].context_window, Some(1_000));
}
#[test]
fn compaction_persists_replacement_history_without_initial_system_message() {
let persisted = Arc::new(Mutex::new(Vec::new()));
let mut agent = test_agent(RecordingProvider::default());
agent.set_history_sink(RecordingHistorySink::replace_target(persisted.clone()));
agent.messages = vec![
Message::System("system".into()),
Message::user_text("summary"),
Message::user_text("recent"),
];
agent.persist_history_replacement().unwrap();
let persisted = persisted.lock().unwrap();
assert_eq!(persisted.len(), 2);
assert!(matches!(persisted[0], Message::User(_)));
assert!(matches!(persisted[1], Message::User(_)));
}
#[tokio::test]
async fn preserves_history_across_runs() {
let provider = RecordingProvider::default();
let requests = provider.requests.clone();
let mut agent = test_agent(provider);
agent.run("first".into()).await.unwrap();
agent.run("second".into()).await.unwrap();
let requests = requests.lock().unwrap();
assert_eq!(requests.len(), 2);
assert!(matches!(requests[1][0], Message::System(_)));
assert!(
matches!(requests[1][1], Message::User(ref blocks) if matches!(blocks.as_slice(), [ContentBlock::Text(s)] if s == "first"))
);
assert!(
matches!(requests[1][2], Message::Assistant(ref blocks) if matches!(blocks.as_slice(), [ContentBlock::Text(s)] if s == "ok"))
);
assert!(
matches!(requests[1][3], Message::User(ref blocks) if matches!(blocks.as_slice(), [ContentBlock::Text(s)] if s == "second"))
);
}
#[tokio::test]
async fn interrupting_before_tools_leaves_no_unmatched_tool_call() {
let persisted = Arc::new(Mutex::new(Vec::new()));
let response = ModelResponse::Assistant(vec![ContentBlock::ToolCall(ToolCall {
id: "call_1".into(),
name: "ok_tool".into(),
arguments: serde_json::json!({}),
})]);
let provider = RecordingProvider {
requests: Arc::default(),
tools: Arc::default(),
prompt_cache_keys: Arc::default(),
response: Some(response),
};
let mut tools = ToolRegistry::new();
tools.register(OkTool);
let mut agent = test_agent_with_tools(provider, tools);
agent.set_history_sink(RecordingHistorySink::append_target(persisted.clone()));
let err = agent
.run_with_events("run tools".into(), |event| match event {
AgentEvent::ToolStarted => Err(ModelError::Interrupted),
_ => Ok(()),
})
.await
.unwrap_err();
assert!(matches!(err, AgentError::Provider(ModelError::Interrupted)));
let persisted = persisted.lock().unwrap();
assert!(persisted
.iter()
.all(|message| !matches!(message, Message::Assistant(_) | Message::ToolResult(_))));
}
#[tokio::test]
async fn persists_all_tool_results_before_interrupting_tool_events() {
let persisted = Arc::new(Mutex::new(Vec::new()));
let response = ModelResponse::Assistant(vec![
ContentBlock::ToolCall(ToolCall {
id: "call_1".into(),
name: "ok_tool".into(),
arguments: serde_json::json!({}),
}),
ContentBlock::ToolCall(ToolCall {
id: "call_2".into(),
name: "ok_tool".into(),
arguments: serde_json::json!({}),
}),
]);
let provider = RecordingProvider {
requests: Arc::default(),
tools: Arc::default(),
prompt_cache_keys: Arc::default(),
response: Some(response),
};
let mut tools = ToolRegistry::new();
tools.register(OkTool);
let mut agent = test_agent_with_tools(provider, tools);
agent.set_history_sink(RecordingHistorySink::append_target(persisted.clone()));
let err = agent
.run_with_events("run tools".into(), |event| match event {
AgentEvent::ToolFinished { .. } => Err(ModelError::Interrupted),
_ => Ok(()),
})
.await
.unwrap_err();
assert!(matches!(err, AgentError::Provider(ModelError::Interrupted)));
let persisted = persisted.lock().unwrap();
let tool_result_count = persisted
.iter()
.filter(|message| matches!(message, Message::ToolResult(_)))
.count();
assert_eq!(tool_result_count, 2);
}
#[tokio::test]
async fn tool_errors_are_returned_to_model_without_stopping_loop() {
let requests = Arc::new(Mutex::new(Vec::new()));
let response = ModelResponse::Assistant(vec![ContentBlock::ToolCall(ToolCall {
id: "call_1".into(),
name: "failing_tool".into(),
arguments: serde_json::json!({}),
})]);
let provider = SequencedProvider {
requests: requests.clone(),
responses: Mutex::new(VecDeque::from([
response,
ModelResponse::Assistant(vec![ContentBlock::Text("recovered".into())]),
])),
};
let mut tools = ToolRegistry::new();
tools.register(FailingTool);
let mut agent = test_agent_with_tools(provider, tools);
let mut tool_events = Vec::new();
let output = agent
.run_with_events("run tool".into(), |event| {
if let AgentEvent::ToolFinished { ok, content, .. } = event {
tool_events.push((ok, content));
}
Ok(())
})
.await
.unwrap();
assert_eq!(output, "recovered");
assert_eq!(tool_events, vec![(false, "tool failed".into())]);
let requests = requests.lock().unwrap();
assert_eq!(requests.len(), 2);
assert!(matches!(
requests[1].last(),
Some(Message::ToolResult(ToolResult { ok: false, content, .. })) if content == "tool failed"
));
}
#[tokio::test]
async fn unknown_tools_are_returned_to_model_without_stopping_loop() {
let requests = Arc::new(Mutex::new(Vec::new()));
let response = ModelResponse::Assistant(vec![ContentBlock::ToolCall(ToolCall {
id: "call_1".into(),
name: "missing_tool".into(),
arguments: serde_json::json!({}),
})]);
let provider = SequencedProvider {
requests: requests.clone(),
responses: Mutex::new(VecDeque::from([
response,
ModelResponse::Assistant(vec![ContentBlock::Text("recovered".into())]),
])),
};
let mut agent = test_agent_with_tools(provider, ToolRegistry::new());
let output = agent.run("run tool".into()).await.unwrap();
assert_eq!(output, "recovered");
let requests = requests.lock().unwrap();
assert_eq!(requests.len(), 2);
assert!(matches!(
requests[1].last(),
Some(Message::ToolResult(ToolResult { ok: false, content, .. })) if content == "Unknown tool: missing_tool"
));
}
#[test]
fn read_file_event_content_shows_requested_line_range() {
let cwd = std::env::current_dir().unwrap();
let content = crate::tools::read_file::ReadFile
.display_content(
&serde_json::json!({"path": "src/main.rs", "offset": 10, "limit": 15}),
&ToolContext {
cwd,
max_output_bytes: 12000,
},
)
.unwrap();
assert_eq!(content, "src/main.rs:10-24");
}
#[test]
fn skill_event_content_shows_skill_name_without_full_content() {
let cwd = std::env::current_dir().unwrap();
let content = crate::tools::skill::Skill
.display_content(
&serde_json::json!({"name": "caveman"}),
&ToolContext {
cwd,
max_output_bytes: 12000,
},
)
.unwrap();
assert_eq!(content, "skill caveman");
}
#[test]
fn read_file_event_content_keeps_plain_path_without_range() {
let cwd = std::env::current_dir().unwrap();
let content = crate::tools::read_file::ReadFile
.display_content(
&serde_json::json!({"path": "src/main.rs"}),
&ToolContext {
cwd,
max_output_bytes: 12000,
},
)
.unwrap();
assert_eq!(content, "src/main.rs");
}
#[test]
fn read_file_event_content_uses_default_range_bounds() {
let cwd = std::env::current_dir().unwrap();
let context = ToolContext {
cwd,
max_output_bytes: 12000,
};
let from_offset = crate::tools::read_file::ReadFile
.display_content(
&serde_json::json!({"path": "src/main.rs", "offset": 10}),
&context,
)
.unwrap();
let from_limit = crate::tools::read_file::ReadFile
.display_content(
&serde_json::json!({"path": "src/main.rs", "limit": 20}),
&context,
)
.unwrap();
assert_eq!(from_offset, "src/main.rs:10-end");
assert_eq!(from_limit, "src/main.rs:1-20");
}
#[test]
fn replace_history_keeps_initial_system_message() {
let mut agent = test_agent(RecordingProvider::default());
agent.replace_history(vec![
Message::user_text("previous user"),
Message::assistant_text("previous assistant"),
]);
assert_eq!(agent.messages.len(), 3);
assert!(matches!(agent.messages[0], Message::System(_)));
assert!(
matches!(agent.messages[1], Message::User(ref blocks) if matches!(blocks.as_slice(), [ContentBlock::Text(s)] if s == "previous user"))
);
assert!(
matches!(agent.messages[2], Message::Assistant(ref blocks) if matches!(blocks.as_slice(), [ContentBlock::Text(s)] if s == "previous assistant"))
);
}
#[tokio::test]
async fn empty_tool_registry_sends_no_tool_specs() {
let provider = RecordingProvider::default();
let tools = provider.tools.clone();
let mut agent = test_agent_with_tools(provider, ToolRegistry::new());
agent.run("hello".into()).await.unwrap();
let tools = tools.lock().unwrap();
assert!(tools.last().unwrap().is_empty());
}
#[tokio::test]
async fn without_system_prompt_sends_only_user_message() {
let provider = RecordingProvider::default();
let requests = provider.requests.clone();
let mut agent = test_agent(provider).without_system_prompt();
assert!(agent.messages().is_empty());
agent.run("hello".into()).await.unwrap();
let requests = requests.lock().unwrap();
let request = requests.last().unwrap();
assert_eq!(request.len(), 1);
assert!(matches!(request[0], Message::User(_)));
}
#[test]
fn replace_history_without_system_prompt_keeps_history_only() {
let mut agent = test_agent(RecordingProvider::default()).without_system_prompt();
agent.replace_history(vec![Message::user_text("previous user")]);
assert_eq!(agent.messages().len(), 1);
assert!(matches!(agent.messages()[0], Message::User(_)));
}
#[tokio::test]
async fn reset_clears_history_back_to_system_prompt() {
let provider = RecordingProvider::default();
let requests = provider.requests.clone();
let mut agent = test_agent(provider);
agent.run("first".into()).await.unwrap();
agent.reset();
agent.run("after reset".into()).await.unwrap();
let requests = requests.lock().unwrap();
let last = requests.last().unwrap();
assert_eq!(last.len(), 2);
assert!(matches!(last[0], Message::System(_)));
assert!(
matches!(last[1], Message::User(ref blocks) if matches!(blocks.as_slice(), [ContentBlock::Text(s)] if s == "after reset"))
);
}