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mod finalize;
mod run_one;
mod sandbox;
use super::{Agent, AgentRunTime, FailureKind, ToolRunState, storage_failure};
use crate::{
error::AgentError,
shared::{ContentBlock, ToolCall},
state::AgentState,
trajectory::TrajectoryEventKind,
};
use futures_util::future::join_all;
use tokio_util::sync::CancellationToken;
impl AgentRunTime {
/// 执行一批工具调用。
///
/// **不变量**:assistant 消息里的每个 `tool_use` 都必须被一条 `tool_result` 回应 ——
/// 成功、失败、被护栏拒绝、被取消,都照样落一条结果(失败/取消写 `is_error: true`)。
/// 任何退出路径都不允许留下"孤儿 tool_use",否则下一轮把 transcript 投影成
/// OpenAI 格式时会因 tool_calls 缺少对应 tool 消息而被 API 直接 400。
pub(crate) async fn execute_pending_tools(
&self,
ctx: &AgentState,
mut tool_run: ToolRunState,
cancellation_token: CancellationToken,
) -> Result<Agent, AgentError> {
if tool_run.cursor >= tool_run.calls.len() {
return Ok(Agent::Ready(ctx.clone()));
}
let sandbox = match self.open_sandbox(ctx, cancellation_token.clone()).await {
Ok(Some(sandbox)) => sandbox,
Ok(None) => {
if let Err(e) = self
.answer_unanswered(
&ctx.session_id,
&tool_run.calls[tool_run.cursor..],
"cancelled by user",
)
.await
{
return Ok(storage_failure(ctx.clone(), e));
}
return self.interrupt(ctx).await;
}
Err(message) => {
if let Err(e) = self
.answer_unanswered(
&ctx.session_id,
&tool_run.calls[tool_run.cursor..],
"tool not executed: sandbox unavailable",
)
.await
{
return Ok(storage_failure(ctx.clone(), e));
}
return Ok(self.fail_with(ctx.clone(), FailureKind::SandboxOpen, message));
}
};
// 从 cursor 往后,按"连续只读"切段:一段只读工具并发执行,非只读工具单独成段串行。
while tool_run.cursor < tool_run.calls.len() {
let start = tool_run.cursor;
let end = self.segment_end(&tool_run.calls, start);
let outcomes =
join_all(tool_run.calls[start..end].iter().map(|call| {
self.run_one(ctx, sandbox.clone(), call, cancellation_token.clone())
}))
.await;
for (offset, outcome) in outcomes.into_iter().enumerate() {
let index = start + offset;
let tool_call = &tool_run.calls[index];
match outcome {
run_one::SingleOutcome::MiddlewareErr {
message,
tool_executed,
} => {
if tool_executed {
if let Err(e) = self
.append_tool_result(
&ctx.session_id,
ContentBlock::ToolResult {
tool_use_id: tool_call.call_id.clone(),
content: vec![ContentBlock::Text {
text: "tool executed but result unavailable: after_tool middleware error"
.to_string(),
}],
is_error: true,
},
)
.await
{
return Ok(storage_failure(ctx.clone(), e));
}
if let Err(e) = self
.answer_unanswered(
&ctx.session_id,
&tool_run.calls[index + 1..],
"skipped due to middleware error",
)
.await
{
return Ok(storage_failure(ctx.clone(), e));
}
} else if let Err(e) = self
.answer_unanswered(
&ctx.session_id,
&tool_run.calls[index..],
"tool not executed: before_tool middleware error",
)
.await
{
return Ok(storage_failure(ctx.clone(), e));
}
self.persist_sandbox(&ctx.session_id, &sandbox).await;
return Ok(self.fail_with(ctx.clone(), FailureKind::Middleware, message));
}
run_one::SingleOutcome::ToolErr(message) => {
if let Err(e) = self
.append_tool_result(
&ctx.session_id,
ContentBlock::ToolResult {
tool_use_id: tool_call.call_id.clone(),
content: vec![ContentBlock::Text {
text: message.clone(),
}],
is_error: true,
},
)
.await
{
return Ok(storage_failure(ctx.clone(), e));
}
if let Err(e) = self
.answer_unanswered(
&ctx.session_id,
&tool_run.calls[index + 1..],
"skipped due to previous failure",
)
.await
{
return Ok(storage_failure(ctx.clone(), e));
}
self.persist_sandbox(&ctx.session_id, &sandbox).await;
return Ok(self.fail_tool(ctx.clone(), tool_call.clone(), message));
}
run_one::SingleOutcome::Cancelled => {
if let Err(e) = self
.answer_unanswered(
&ctx.session_id,
&tool_run.calls[index..],
"cancelled by user",
)
.await
{
return Ok(storage_failure(ctx.clone(), e));
}
self.persist_sandbox(&ctx.session_id, &sandbox).await;
return self.interrupt(ctx).await;
}
run_one::SingleOutcome::Done(result) => {
if let Err(e) = self.append_tool_result(&ctx.session_id, result).await {
return Ok(storage_failure(ctx.clone(), e));
}
tool_run.cursor = index + 1;
}
run_one::SingleOutcome::NeedsUserInteraction {
result,
interaction,
} => {
if let Err(e) = self.append_tool_result(&ctx.session_id, result).await {
return Ok(storage_failure(ctx.clone(), e));
}
tool_run.cursor = index + 1;
if let Err(e) = self
.answer_unanswered(
&ctx.session_id,
&tool_run.calls[tool_run.cursor..],
"skipped pending user input",
)
.await
{
return Ok(storage_failure(ctx.clone(), e));
}
self.persist_sandbox(&ctx.session_id, &sandbox).await;
let agent = Agent::WaitingForUser(ctx.clone(), interaction.clone());
if let Err(e) = self
.checkpoint_storage
.save_checkpoint(&ctx.session_id, &agent)
.await
{
return Ok(storage_failure(ctx.clone(), e));
}
self.emit(
&ctx.session_id,
TrajectoryEventKind::WaitingForUser { interaction },
)
.await;
return Ok(agent);
}
}
}
}
tokio::select! {
_ = cancellation_token.cancelled() => {
self.persist_sandbox(&ctx.session_id, &sandbox).await;
self.interrupt(ctx).await
}
save_result = sandbox.save() => {
match save_result {
Ok(()) => {
let mut next_ctx = ctx.clone();
next_ctx.consecutive_fail_count = 0;
Ok(Agent::Ready(next_ctx))
}
Err(e) => {
Ok(self.fail_with(ctx.clone(), FailureKind::SandboxSave, e.to_string()))
}
}
}
}
}
/// 求出从 `start` 起的并发段右边界(开区间)。
fn segment_end(&self, calls: &[ToolCall], start: usize) -> usize {
if !self.tools.is_read_only(&calls[start].tool_name) {
return start + 1;
}
let mut end = start;
while end < calls.len() && self.tools.is_read_only(&calls[end].tool_name) {
end += 1;
}
end
}
}