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agent2: Token count (#36496)

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Release Notes:

- N/A

---------

Co-authored-by: Agus Zubiaga <agus@zed.dev>
This commit is contained in:
Bennet Bo Fenner 2025-08-19 22:40:31 +02:00 • committed by GitHub
parent 6825715503
commit 5fb68cb8be
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GPG key ID: B5690EEEBB952194
9 changed files with 321 additions and 26 deletions
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19
crates/acp_thread/src/acp_thread.rs
View file

@ -6,6 +6,7 @@ mod terminal;
pub use connection::*;
pub use diff::*;
pub use mention::*;
use serde::{Deserialize, Serialize};
pub use terminal::*;
use action_log::ActionLog;
@ -664,6 +665,12 @@ impl PlanEntry {
}
}
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct TokenUsage {
pub max_tokens: u64,
pub used_tokens: u64,
}
#[derive(Debug, Clone)]
pub struct RetryStatus {
pub last_error: SharedString,
@ -683,12 +690,14 @@ pub struct AcpThread {
send_task: Option<Task<()>>,
connection: Rc<dyn AgentConnection>,
session_id: acp::SessionId,
token_usage: Option<TokenUsage>,
}
#[derive(Debug)]
pub enum AcpThreadEvent {
NewEntry,
TitleUpdated,
TokenUsageUpdated,
EntryUpdated(usize),
EntriesRemoved(Range<usize>),
ToolAuthorizationRequired,
@ -748,6 +757,7 @@ impl AcpThread {
send_task: None,
connection,
session_id,
token_usage: None,
}
}
@ -787,6 +797,10 @@ impl AcpThread {
}
}
pub fn token_usage(&self) -> Option<&TokenUsage> {
self.token_usage.as_ref()
}
pub fn has_pending_edit_tool_calls(&self) -> bool {
for entry in self.entries.iter().rev() {
match entry {
@ -937,6 +951,11 @@ impl AcpThread {
Ok(())
}
pub fn update_token_usage(&mut self, usage: Option<TokenUsage>, cx: &mut Context<Self>) {
self.token_usage = usage;
cx.emit(AcpThreadEvent::TokenUsageUpdated);
}
pub fn update_retry_status(&mut self, status: RetryStatus, cx: &mut Context<Self>) {
cx.emit(AcpThreadEvent::Retry(status));
}

2
crates/acp_thread/src/connection.rs
View file

@ -10,7 +10,7 @@ use std::{any::Any, error::Error, fmt, path::Path, rc::Rc, sync::Arc};
use ui::{App, IconName};
use uuid::Uuid;
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Hash)]
pub struct UserMessageId(Arc<str>);
impl UserMessageId {

1
crates/agent2/Cargo.toml
View file

@ -66,6 +66,7 @@ zstd.workspace = true
[dev-dependencies]
agent = { workspace = true, "features" = ["test-support"] }
assistant_context = { workspace = true, "features" = ["test-support"] }
ctor.workspace = true
client = { workspace = true, "features" = ["test-support"] }
clock = { workspace = true, "features" = ["test-support"] }

44
crates/agent2/src/agent.rs
View file

@ -1,8 +1,8 @@
use crate::HistoryStore;
use crate::{
ContextServerRegistry, Thread, ThreadEvent, ToolCallAuthorization, UserMessageContent,
templates::Templates,
ContextServerRegistry, Thread, ThreadEvent, ThreadsDatabase, ToolCallAuthorization,
UserMessageContent, templates::Templates,
};
use crate::{HistoryStore, ThreadsDatabase};
use acp_thread::{AcpThread, AgentModelSelector};
use action_log::ActionLog;
use agent_client_protocol as acp;
@ -673,6 +673,11 @@ impl NativeAgentConnection {
thread.update_tool_call(update, cx)
})??;
}
ThreadEvent::TokenUsageUpdate(usage) => {
acp_thread.update(cx, |thread, cx| {
thread.update_token_usage(Some(usage), cx)
})?;
}
ThreadEvent::TitleUpdate(title) => {
acp_thread
.update(cx, |thread, cx| thread.update_title(title, cx))??;
@ -895,10 +900,12 @@ impl acp_thread::AgentConnection for NativeAgentConnection {
cx: &mut App,
) -> Option<Rc<dyn acp_thread::AgentSessionEditor>> {
self.0.update(cx, |agent, _cx| {
agent
.sessions
.get(session_id)
.map(|session| Rc::new(NativeAgentSessionEditor(session.thread.clone())) as _)
agent.sessions.get(session_id).map(|session| {
Rc::new(NativeAgentSessionEditor {
thread: session.thread.clone(),
acp_thread: session.acp_thread.clone(),
}) as _
})
})
}
@ -907,14 +914,27 @@ impl acp_thread::AgentConnection for NativeAgentConnection {
}
}
struct NativeAgentSessionEditor(Entity<Thread>);
struct NativeAgentSessionEditor {
thread: Entity<Thread>,
acp_thread: WeakEntity<AcpThread>,
}
impl acp_thread::AgentSessionEditor for NativeAgentSessionEditor {
fn truncate(&self, message_id: acp_thread::UserMessageId, cx: &mut App) -> Task<Result<()>> {
Task::ready(
self.0
.update(cx, |thread, cx| thread.truncate(message_id, cx)),
)
match self.thread.update(cx, |thread, cx| {
thread.truncate(message_id.clone(), cx)?;
Ok(thread.latest_token_usage())
}) {
Ok(usage) => {
self.acp_thread
.update(cx, |thread, cx| {
thread.update_token_usage(usage, cx);
})
.ok();
Task::ready(Ok(()))
}
Err(error) => Task::ready(Err(error)),
}
}
}

21
crates/agent2/src/db.rs
View file

@ -1,4 +1,5 @@
use crate::{AgentMessage, AgentMessageContent, UserMessage, UserMessageContent};
use acp_thread::UserMessageId;
use agent::thread_store;
use agent_client_protocol as acp;
use agent_settings::{AgentProfileId, CompletionMode};
@ -42,7 +43,7 @@ pub struct DbThread {
#[serde(default)]
pub cumulative_token_usage: language_model::TokenUsage,
#[serde(default)]
pub request_token_usage: Vec<language_model::TokenUsage>,
pub request_token_usage: HashMap<acp_thread::UserMessageId, language_model::TokenUsage>,
#[serde(default)]
pub model: Option<DbLanguageModel>,
#[serde(default)]
@ -67,7 +68,10 @@ impl DbThread {
fn upgrade_from_agent_1(thread: agent::SerializedThread) -> Result<Self> {
let mut messages = Vec::new();
for msg in thread.messages {
let mut request_token_usage = HashMap::default();
let mut last_user_message_id = None;
for (ix, msg) in thread.messages.into_iter().enumerate() {
let message = match msg.role {
language_model::Role::User => {
let mut content = Vec::new();
@ -93,9 +97,12 @@ impl DbThread {
content.push(UserMessageContent::Text(msg.context));
}
let id = UserMessageId::new();
last_user_message_id = Some(id.clone());
crate::Message::User(UserMessage {
// MessageId from old format can't be meaningfully converted, so generate a new one
id: acp_thread::UserMessageId::new(),
id,
content,
})
}
@ -154,6 +161,12 @@ impl DbThread {
);
}
if let Some(last_user_message_id) = &last_user_message_id
&& let Some(token_usage) = thread.request_token_usage.get(ix).copied()
{
request_token_usage.insert(last_user_message_id.clone(), token_usage);
}
crate::Message::Agent(AgentMessage {
content,
tool_results,
@ -175,7 +188,7 @@ impl DbThread {
summary: thread.detailed_summary_state,
initial_project_snapshot: thread.initial_project_snapshot,
cumulative_token_usage: thread.cumulative_token_usage,
request_token_usage: thread.request_token_usage,
request_token_usage,
model: thread.model,
completion_mode: thread.completion_mode,
profile: thread.profile,

144
crates/agent2/src/tests/mod.rs
View file

@ -1117,7 +1117,7 @@ async fn test_refusal(cx: &mut TestAppContext) {
}
#[gpui::test]
async fn test_truncate(cx: &mut TestAppContext) {
async fn test_truncate_first_message(cx: &mut TestAppContext) {
let ThreadTest { model, thread, .. } = setup(cx, TestModel::Fake).await;
let fake_model = model.as_fake();
@ -1137,9 +1137,18 @@ async fn test_truncate(cx: &mut TestAppContext) {
Hello
"}
);
assert_eq!(thread.latest_token_usage(), None);
});
fake_model.send_last_completion_stream_text_chunk("Hey!");
fake_model.send_last_completion_stream_event(LanguageModelCompletionEvent::UsageUpdate(
language_model::TokenUsage {
input_tokens: 32_000,
output_tokens: 16_000,
cache_creation_input_tokens: 0,
cache_read_input_tokens: 0,
},
));
cx.run_until_parked();
thread.read_with(cx, |thread, _| {
assert_eq!(
@ -1154,6 +1163,13 @@ async fn test_truncate(cx: &mut TestAppContext) {
Hey!
"}
);
assert_eq!(
thread.latest_token_usage(),
Some(acp_thread::TokenUsage {
used_tokens: 32_000 + 16_000,
max_tokens: 1_000_000,
})
);
});
thread
@ -1162,6 +1178,7 @@ async fn test_truncate(cx: &mut TestAppContext) {
cx.run_until_parked();
thread.read_with(cx, |thread, _| {
assert_eq!(thread.to_markdown(), "");
assert_eq!(thread.latest_token_usage(), None);
});
// Ensure we can still send a new message after truncation.
@ -1182,6 +1199,14 @@ async fn test_truncate(cx: &mut TestAppContext) {
});
cx.run_until_parked();
fake_model.send_last_completion_stream_text_chunk("Ahoy!");
fake_model.send_last_completion_stream_event(LanguageModelCompletionEvent::UsageUpdate(
language_model::TokenUsage {
input_tokens: 40_000,
output_tokens: 20_000,
cache_creation_input_tokens: 0,
cache_read_input_tokens: 0,
},
));
cx.run_until_parked();
thread.read_with(cx, |thread, _| {
assert_eq!(
@ -1196,9 +1221,126 @@ async fn test_truncate(cx: &mut TestAppContext) {
Ahoy!
"}
);
assert_eq!(
thread.latest_token_usage(),
Some(acp_thread::TokenUsage {
used_tokens: 40_000 + 20_000,
max_tokens: 1_000_000,
})
);
});
}
#[gpui::test]
async fn test_truncate_second_message(cx: &mut TestAppContext) {
let ThreadTest { model, thread, .. } = setup(cx, TestModel::Fake).await;
let fake_model = model.as_fake();
thread
.update(cx, |thread, cx| {
thread.send(UserMessageId::new(), ["Message 1"], cx)
})
.unwrap();
cx.run_until_parked();
fake_model.send_last_completion_stream_text_chunk("Message 1 response");
fake_model.send_last_completion_stream_event(LanguageModelCompletionEvent::UsageUpdate(
language_model::TokenUsage {
input_tokens: 32_000,
output_tokens: 16_000,
cache_creation_input_tokens: 0,
cache_read_input_tokens: 0,
},
));
fake_model.end_last_completion_stream();
cx.run_until_parked();
let assert_first_message_state = |cx: &mut TestAppContext| {
thread.clone().read_with(cx, |thread, _| {
assert_eq!(
thread.to_markdown(),
indoc! {"
## User
Message 1
## Assistant
Message 1 response
"}
);
assert_eq!(
thread.latest_token_usage(),
Some(acp_thread::TokenUsage {
used_tokens: 32_000 + 16_000,
max_tokens: 1_000_000,
})
);
});
};
assert_first_message_state(cx);
let second_message_id = UserMessageId::new();
thread
.update(cx, |thread, cx| {
thread.send(second_message_id.clone(), ["Message 2"], cx)
})
.unwrap();
cx.run_until_parked();
fake_model.send_last_completion_stream_text_chunk("Message 2 response");
fake_model.send_last_completion_stream_event(LanguageModelCompletionEvent::UsageUpdate(
language_model::TokenUsage {
input_tokens: 40_000,
output_tokens: 20_000,
cache_creation_input_tokens: 0,
cache_read_input_tokens: 0,
},
));
fake_model.end_last_completion_stream();
cx.run_until_parked();
thread.read_with(cx, |thread, _| {
assert_eq!(
thread.to_markdown(),
indoc! {"
## User
Message 1
## Assistant
Message 1 response
## User
Message 2
## Assistant
Message 2 response
"}
);
assert_eq!(
thread.latest_token_usage(),
Some(acp_thread::TokenUsage {
used_tokens: 40_000 + 20_000,
max_tokens: 1_000_000,
})
);
});
thread
.update(cx, |thread, cx| thread.truncate(second_message_id, cx))
.unwrap();
cx.run_until_parked();
assert_first_message_state(cx);
}
#[gpui::test]
async fn test_title_generation(cx: &mut TestAppContext) {
let ThreadTest { model, thread, .. } = setup(cx, TestModel::Fake).await;

74
crates/agent2/src/thread.rs
View file

@ -13,7 +13,7 @@ use anyhow::{Context as _, Result, anyhow};
use assistant_tool::adapt_schema_to_format;
use chrono::{DateTime, Utc};
use cloud_llm_client::{CompletionIntent, CompletionRequestStatus};
use collections::IndexMap;
use collections::{HashMap, IndexMap};
use fs::Fs;
use futures::{
FutureExt,
@ -24,8 +24,8 @@ use futures::{
use git::repository::DiffType;
use gpui::{App, AppContext, AsyncApp, Context, Entity, SharedString, Task, WeakEntity};
use language_model::{
LanguageModel, LanguageModelCompletionError, LanguageModelCompletionEvent, LanguageModelImage,
LanguageModelProviderId, LanguageModelRegistry, LanguageModelRequest,
LanguageModel, LanguageModelCompletionError, LanguageModelCompletionEvent, LanguageModelExt,
LanguageModelImage, LanguageModelProviderId, LanguageModelRegistry, LanguageModelRequest,
LanguageModelRequestMessage, LanguageModelRequestTool, LanguageModelToolResult,
LanguageModelToolResultContent, LanguageModelToolSchemaFormat, LanguageModelToolUse,
LanguageModelToolUseId, Role, SelectedModel, StopReason, TokenUsage,
@ -481,6 +481,7 @@ pub enum ThreadEvent {
ToolCall(acp::ToolCall),
ToolCallUpdate(acp_thread::ToolCallUpdate),
ToolCallAuthorization(ToolCallAuthorization),
TokenUsageUpdate(acp_thread::TokenUsage),
TitleUpdate(SharedString),
Retry(acp_thread::RetryStatus),
Stop(acp::StopReason),
@ -509,8 +510,7 @@ pub struct Thread {
pending_message: Option<AgentMessage>,
tools: BTreeMap<SharedString, Arc<dyn AnyAgentTool>>,
tool_use_limit_reached: bool,
#[allow(unused)]
request_token_usage: Vec<TokenUsage>,
request_token_usage: HashMap<UserMessageId, language_model::TokenUsage>,
#[allow(unused)]
cumulative_token_usage: TokenUsage,
#[allow(unused)]
@ -548,7 +548,7 @@ impl Thread {
pending_message: None,
tools: BTreeMap::default(),
tool_use_limit_reached: false,
request_token_usage: Vec::new(),
request_token_usage: HashMap::default(),
cumulative_token_usage: TokenUsage::default(),
initial_project_snapshot: {
let project_snapshot = Self::project_snapshot(project.clone(), cx);
@ -951,6 +951,15 @@ impl Thread {
self.flush_pending_message(cx);
}
pub fn update_token_usage(&mut self, update: language_model::TokenUsage) {
let Some(last_user_message) = self.last_user_message() else {
return;
};
self.request_token_usage
.insert(last_user_message.id.clone(), update);
}
pub fn truncate(&mut self, message_id: UserMessageId, cx: &mut Context<Self>) -> Result<()> {
self.cancel(cx);
let Some(position) = self.messages.iter().position(
@ -958,11 +967,31 @@ impl Thread {
) else {
return Err(anyhow!("Message not found"));
};
self.messages.truncate(position);
for message in self.messages.drain(position..) {
match message {
Message::User(message) => {
self.request_token_usage.remove(&message.id);
}
Message::Agent(_) | Message::Resume => {}
}
}
cx.notify();
Ok(())
}
pub fn latest_token_usage(&self) -> Option<acp_thread::TokenUsage> {
let last_user_message = self.last_user_message()?;
let tokens = self.request_token_usage.get(&last_user_message.id)?;
let model = self.model.clone()?;
Some(acp_thread::TokenUsage {
max_tokens: model.max_token_count_for_mode(self.completion_mode.into()),
used_tokens: tokens.total_tokens(),
})
}
pub fn resume(
&mut self,
cx: &mut Context<Self>,
@ -1148,6 +1177,21 @@ impl Thread {
)) => {
*tool_use_limit_reached = true;
}
Ok(LanguageModelCompletionEvent::UsageUpdate(token_usage)) => {
let usage = acp_thread::TokenUsage {
max_tokens: model.max_token_count_for_mode(
request
.mode
.unwrap_or(cloud_llm_client::CompletionMode::Normal),
),
used_tokens: token_usage.total_tokens(),
};
this.update(cx, |this, _cx| this.update_token_usage(token_usage))
.ok();
event_stream.send_token_usage_update(usage);
}
Ok(LanguageModelCompletionEvent::Stop(StopReason::Refusal)) => {
*refusal = true;
return Ok(FuturesUnordered::default());
@ -1532,6 +1576,16 @@ impl Thread {
})
}))
}
fn last_user_message(&self) -> Option<&UserMessage> {
self.messages
.iter()
.rev()
.find_map(|message| match message {
Message::User(user_message) => Some(user_message),
Message::Agent(_) => None,
Message::Resume => None,
})
}
fn pending_message(&mut self) -> &mut AgentMessage {
self.pending_message.get_or_insert_default()
@ -2051,6 +2105,12 @@ impl ThreadEventStream {
.ok();
}
fn send_token_usage_update(&self, usage: acp_thread::TokenUsage) {
self.0
.unbounded_send(Ok(ThreadEvent::TokenUsageUpdate(usage)))
.ok();
}
fn send_retry(&self, status: acp_thread::RetryStatus) {
self.0.unbounded_send(Ok(ThreadEvent::Retry(status))).ok();
}

41
crates/agent_ui/src/acp/thread_view.rs
View file

@ -816,7 +816,7 @@ impl AcpThreadView {
self.thread_retry_status.take();
self.thread_state = ThreadState::ServerExited { status: *status };
}
AcpThreadEvent::TitleUpdated => {}
AcpThreadEvent::TitleUpdated | AcpThreadEvent::TokenUsageUpdated => {}
}
cx.notify();
}
@ -2794,6 +2794,7 @@ impl AcpThreadView {
.child(
h_flex()
.gap_1()
.children(self.render_token_usage(cx))
.children(self.profile_selector.clone())
.children(self.model_selector.clone())
.child(self.render_send_button(cx)),
@ -2816,6 +2817,44 @@ impl AcpThreadView {
.thread(acp_thread.session_id(), cx)
}
fn render_token_usage(&self, cx: &mut Context<Self>) -> Option<Div> {
let thread = self.thread()?.read(cx);
let usage = thread.token_usage()?;
let is_generating = thread.status() != ThreadStatus::Idle;
let used = crate::text_thread_editor::humanize_token_count(usage.used_tokens);
let max = crate::text_thread_editor::humanize_token_count(usage.max_tokens);
Some(
h_flex()
.flex_shrink_0()
.gap_0p5()
.mr_1()
.child(
Label::new(used)
.size(LabelSize::Small)
.color(Color::Muted)
.map(|label| {
if is_generating {
label
.with_animation(
"used-tokens-label",
Animation::new(Duration::from_secs(2))
.repeat()
.with_easing(pulsating_between(0.6, 1.)),
|label, delta| label.alpha(delta),
)
.into_any()
} else {
label.into_any_element()
}
}),
)
.child(Label::new("/").size(LabelSize::Small).color(Color::Muted))
.child(Label::new(max).size(LabelSize::Small).color(Color::Muted)),
)
}
fn toggle_burn_mode(
&mut self,
_: &ToggleBurnMode,

1
crates/agent_ui/src/agent_diff.rs
View file

@ -1526,6 +1526,7 @@ impl AgentDiff {
self.update_reviewing_editors(workspace, window, cx);
}
AcpThreadEvent::TitleUpdated
| AcpThreadEvent::TokenUsageUpdated
| AcpThreadEvent::EntriesRemoved(_)
| AcpThreadEvent::ToolAuthorizationRequired
| AcpThreadEvent::Retry(_) => {}