diff --git a/cli/tests/agent.rs b/cli/tests/agent.rs
new file mode 100644
index 0000000..a3d77ab
--- /dev/null
+++ b/cli/tests/agent.rs
@@ -0,0 +1,647 @@
+//! Integration tests for the agent's inference and restart behavior.
+
+#[allow(dead_code)]
+mod common;
+
+use std::collections::HashMap;
+use std::path::PathBuf;
+use std::process::Command;
+use std::sync::OnceLock;
+use std::time::Duration;
+
+use common::{create_world, receive_replies, receive_reply, request, source_with_test, start};
+use sausage::{Envelope, Host, World};
+use serde_json::{Value, json};
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tokio::net::{TcpListener, TcpStream};
+use tokio::sync::{mpsc, oneshot};
+use tokio::task::{JoinHandle, JoinSet};
+
+const APIS: [Api; 2] = [Api::OpenAi, Api::Anthropic];
+const TEST_TOKEN: &str = "fake-token";
+
+#[derive(Clone, Copy)]
+enum Api {
+    OpenAi,
+    Anthropic,
+}
+
+impl Api {
+    fn name(self) -> &'static str {
+        match self {
+            Self::OpenAi => "openai-responses",
+            Self::Anthropic => "anthropic-messages",
+        }
+    }
+
+    fn path(self) -> &'static str {
+        match self {
+            Self::OpenAi => "/v1/responses",
+            Self::Anthropic => "/v1/messages",
+        }
+    }
+
+    fn text_response(self, text: &str) -> Value {
+        match self {
+            Self::OpenAi => {
+                json!({"output": [{"type": "message", "content": [{"type": "output_text", "text": text}]}]})
+            }
+            Self::Anthropic => json!({"content": [{"type": "text", "text": text}]}),
+        }
+    }
+
+    fn tool_response(self, id: &str, name: &str, arguments: &Value) -> Value {
+        match self {
+            Self::OpenAi => {
+                json!({"output": [{"type": "function_call", "call_id": id, "name": name, "arguments": arguments.to_string()}]})
+            }
+            Self::Anthropic => {
+                json!({"content": [{"type": "tool_use", "id": id, "name": name, "input": arguments}]})
+            }
+        }
+    }
+
+    fn check_request(self, request: &HttpRequest) {
+        assert_eq!(request.method, "POST");
+        assert_eq!(request.path, self.path());
+        assert_eq!(request.headers["content-type"], "application/json");
+        assert_eq!(request.body["model"], "fake-model");
+        match self {
+            Self::OpenAi => assert_eq!(request.headers["authorization"], "Bearer fake-token"),
+            Self::Anthropic => {
+                assert_eq!(request.headers["x-api-key"], TEST_TOKEN);
+                assert_eq!(request.headers["anthropic-version"], "2023-06-01");
+            }
+        }
+    }
+}
+
+struct HttpRequest {
+    method: String,
+    path: String,
+    headers: HashMap<String, String>,
+    body: Value,
+}
+
+enum ReplyPlan {
+    Send(Value),
+    Hold(Value, oneshot::Receiver<()>),
+}
+
+struct FakeServer {
+    base_url: String,
+    plans: mpsc::Sender<ReplyPlan>,
+    requests: mpsc::Receiver<HttpRequest>,
+    task: JoinHandle<()>,
+}
+
+impl FakeServer {
+    async fn start() -> Self {
+        let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
+        let address = listener.local_addr().unwrap();
+        let (plans, mut plan_rx) = mpsc::channel(16);
+        let (request_tx, requests) = mpsc::channel(16);
+        let task = tokio::spawn(async move {
+            let mut handlers = JoinSet::new();
+            loop {
+                tokio::select! {
+                    accepted = listener.accept() => {
+                        let (mut stream, _) = accepted.expect("fake listener accept failed");
+                        let request = read_http_request(&mut stream).await;
+                        let Some(plan) = plan_rx.recv().await else { break };
+                        if request_tx.send(request).await.is_err() {
+                            break;
+                        }
+                        handlers.spawn(async move {
+                            let (body, release) = match plan {
+                                ReplyPlan::Send(body) => (body, None),
+                                ReplyPlan::Hold(body, release) => (body, Some(release)),
+                            };
+                            if let Some(release) = release {
+                                let _ = release.await;
+                            }
+                            write_http_response(stream, body).await;
+                        });
+                    }
+                    Some(_) = handlers.join_next(), if !handlers.is_empty() => {}
+                }
+            }
+        });
+        Self {
+            base_url: format!("http://127.0.0.1:{}", address.port()),
+            plans,
+            requests,
+            task,
+        }
+    }
+
+    async fn answer(&self, body: Value) {
+        self.plans.send(ReplyPlan::Send(body)).await.unwrap();
+    }
+
+    async fn hold(&self, body: Value) -> oneshot::Sender<()> {
+        let (release, wait) = oneshot::channel();
+        self.plans.send(ReplyPlan::Hold(body, wait)).await.unwrap();
+        release
+    }
+
+    async fn next_request(&mut self) -> HttpRequest {
+        tokio::time::timeout(Duration::from_secs(20), self.requests.recv())
+            .await
+            .expect("timed out waiting for fake inference request")
+            .expect("fake server request channel closed")
+    }
+}
+
+impl Drop for FakeServer {
+    fn drop(&mut self) {
+        self.task.abort();
+    }
+}
+
+async fn read_http_request(stream: &mut TcpStream) -> HttpRequest {
+    let mut received = Vec::new();
+    let mut chunk = [0; 4096];
+    let header_end = loop {
+        let count = stream.read(&mut chunk).await.expect("read HTTP request");
+        assert_ne!(count, 0, "client closed before HTTP headers arrived");
+        received.extend_from_slice(&chunk[..count]);
+        if let Some(end) = received.windows(4).position(|part| part == b"\r\n\r\n") {
+            break end;
+        }
+    };
+
+    let header_text = String::from_utf8_lossy(&received[..header_end]);
+    let mut lines = header_text.split("\r\n");
+    let mut request_line = lines.next().unwrap().split_whitespace();
+    let method = request_line.next().unwrap().to_string();
+    let path = request_line.next().unwrap().to_string();
+    let mut headers = HashMap::new();
+    for line in lines {
+        if let Some((name, value)) = line.split_once(':') {
+            headers.insert(name.trim().to_ascii_lowercase(), value.trim().to_string());
+        }
+    }
+
+    let body_start = header_end + 4;
+    let request_body = if let Some(length) = headers.get("content-length") {
+        let body_length = length.parse::<usize>().unwrap();
+        while received.len() < body_start + body_length {
+            let count = stream.read(&mut chunk).await.expect("read HTTP body");
+            assert_ne!(count, 0, "client closed before HTTP body arrived");
+            received.extend_from_slice(&chunk[..count]);
+        }
+        received[body_start..body_start + body_length].to_vec()
+    } else {
+        assert!(
+            headers
+                .get("transfer-encoding")
+                .is_some_and(|value| value.eq_ignore_ascii_case("chunked")),
+            "request has neither Content-Length nor chunked transfer encoding: {headers:?}"
+        );
+        read_chunked_body(stream, &mut received, body_start).await
+    };
+    let body = serde_json::from_slice(&request_body).unwrap();
+    HttpRequest {
+        method,
+        path,
+        headers,
+        body,
+    }
+}
+
+async fn read_chunked_body(
+    stream: &mut TcpStream,
+    received: &mut Vec<u8>,
+    mut offset: usize,
+) -> Vec<u8> {
+    let mut body = Vec::new();
+    loop {
+        let line_end = loop {
+            if let Some(end) = received[offset..]
+                .windows(2)
+                .position(|part| part == b"\r\n")
+            {
+                break offset + end;
+            }
+            let mut chunk = [0; 4096];
+            let count = stream.read(&mut chunk).await.expect("read chunk size");
+            assert_ne!(count, 0, "client closed before chunk size arrived");
+            received.extend_from_slice(&chunk[..count]);
+        };
+        let size = String::from_utf8_lossy(&received[offset..line_end]);
+        let size = size.split(';').next().unwrap().trim();
+        let size = usize::from_str_radix(size, 16).unwrap();
+        offset = line_end + 2;
+        if size == 0 {
+            return body;
+        }
+        while received.len() < offset + size + 2 {
+            let mut chunk = [0; 4096];
+            let count = stream.read(&mut chunk).await.expect("read chunk data");
+            assert_ne!(count, 0, "client closed before chunk data arrived");
+            received.extend_from_slice(&chunk[..count]);
+        }
+        body.extend_from_slice(&received[offset..offset + size]);
+        assert_eq!(&received[offset + size..offset + size + 2], b"\r\n");
+        offset += size + 2;
+    }
+}
+
+async fn write_http_response(mut stream: TcpStream, body: Value) {
+    let body = serde_json::to_vec(&body).unwrap();
+    let head = format!(
+        "HTTP/1.1 200 OK\r\ncontent-type: application/json\r\ncontent-length: {}\r\nconnection: close\r\n\r\n",
+        body.len()
+    );
+    let mut response = head.into_bytes();
+    response.extend_from_slice(&body);
+    let _ = stream.write_all(&response).await;
+    let _ = stream.shutdown().await;
+}
+
+fn agent_wasm() -> &'static PathBuf {
+    static WASM: OnceLock<PathBuf> = OnceLock::new();
+    WASM.get_or_init(|| {
+        let root = common::repo_root();
+        let output = Command::new("cargo")
+            .args([
+                "build",
+                "--release",
+                "-p",
+                "agent",
+                "--target",
+                "wasm32-wasip2",
+                "--target-dir",
+                "target/test-actors",
+            ])
+            .current_dir(&root)
+            .output()
+            .expect("run cargo to build the agent actor");
+        assert!(
+            output.status.success(),
+            "building agent failed\nstdout:\n{}\nstderr:\n{}",
+            String::from_utf8_lossy(&output.stdout),
+            String::from_utf8_lossy(&output.stderr)
+        );
+        let wasm = root.join("target/test-actors/wasm32-wasip2/release/agent.wasm");
+        assert!(
+            wasm.is_file(),
+            "agent build did not create {}",
+            wasm.display()
+        );
+        wasm
+    })
+}
+
+async fn start_agent(
+    api: Api,
+    fake: &FakeServer,
+    label: &str,
+) -> (World, Host, mpsc::Receiver<Envelope>) {
+    let world = create_world(label);
+    let data = world.data_dir("agent");
+    std::fs::create_dir_all(&data).unwrap();
+    let config = json!({"api": api.name(), "base_url": fake.base_url, "model": "fake-model", "token": TEST_TOKEN});
+    std::fs::write(
+        data.join("config.json"),
+        serde_json::to_vec(&config).unwrap(),
+    )
+    .unwrap();
+    let source = source_with_test(
+        &world,
+        "agent-candidate",
+        json!({"steps": [{"send": {"type": "text", "text": "candidate"}, "expect": {"type": "text"}}]}),
+    );
+    let (host, mut mailbox) = start(&world).await;
+    let spawned = common::spawn_actor(&host, &mut mailbox, "agent", agent_wasm(), &source).await;
+    assert_eq!(
+        spawned.body["type"], "spawned",
+        "agent spawn failed: {spawned:?}"
+    );
+    (world, host, mailbox)
+}
+
+fn send_text(host: &Host, text: &str) -> String {
+    host.broker.send(
+        "console",
+        Some("agent"),
+        None,
+        None,
+        json!({"type": "text", "text": text}),
+    )
+}
+
+async fn assert_answer(mailbox: &mut mpsc::Receiver<Envelope>, id: &str, text: &str) {
+    let reply = receive_reply(mailbox, id, Duration::from_secs(20)).await;
+    assert_eq!(reply.to, "console");
+    assert_eq!(reply.reply_to.as_deref(), Some(id));
+    assert_eq!(reply.body, json!({"type": "text", "text": text}));
+}
+
+fn history(world: &World) -> Vec<Value> {
+    std::fs::read_to_string(world.data_dir("agent").join("history.jsonl"))
+        .unwrap()
+        .lines()
+        .map(|line| serde_json::from_str(line).unwrap())
+        .collect()
+}
+
+fn assert_history_tools_have_results(history: &[Value]) {
+    let calls: Vec<_> = history
+        .iter()
+        .filter(|entry| entry["kind"] == "tool_call")
+        .collect();
+    let results: Vec<_> = history
+        .iter()
+        .filter(|entry| entry["kind"] == "tool_result")
+        .collect();
+    assert_eq!(calls.len(), results.len());
+    for call in calls {
+        assert!(
+            results.iter().any(|result| result["id"] == call["id"]),
+            "tool call has no result: {call}"
+        );
+    }
+}
+
+fn assert_tool_pair(
+    request: &HttpRequest,
+    api: Api,
+    id: &str,
+    name: &str,
+    arguments: &Value,
+) -> String {
+    match api {
+        Api::OpenAi => {
+            let input = request.body["input"].as_array().unwrap();
+            let call_index = input
+                .iter()
+                .position(|item| item["type"] == "function_call")
+                .unwrap();
+            let result_index = input
+                .iter()
+                .position(|item| item["type"] == "function_call_output")
+                .unwrap();
+            assert!(call_index < result_index);
+            let call = &input[call_index];
+            assert_eq!(call["call_id"], id);
+            assert_eq!(call["name"], name);
+            assert_eq!(
+                serde_json::from_str::<Value>(call["arguments"].as_str().unwrap()).unwrap(),
+                *arguments
+            );
+            let result = &input[result_index];
+            assert_eq!(result["call_id"], id);
+            result["output"].as_str().unwrap().to_string()
+        }
+        Api::Anthropic => {
+            let messages = request.body["messages"].as_array().unwrap();
+            let mut call_position = None;
+            let mut result_position = None;
+            let mut call = None;
+            let mut result = None;
+            for (index, message) in messages.iter().enumerate() {
+                let Some(blocks) = message["content"].as_array() else {
+                    continue;
+                };
+                for block in blocks {
+                    match block["type"].as_str() {
+                        Some("tool_use") => {
+                            call_position = Some(index);
+                            call = Some(block);
+                        }
+                        Some("tool_result") => {
+                            result_position = Some(index);
+                            result = Some(block);
+                        }
+                        _ => {}
+                    }
+                }
+            }
+            assert!(call_position.unwrap() < result_position.unwrap());
+            let call = call.unwrap();
+            assert_eq!(call["id"], id);
+            assert_eq!(call["name"], name);
+            assert_eq!(call["input"], *arguments);
+            let result = result.unwrap();
+            assert_eq!(result["tool_use_id"], id);
+            result["content"].as_str().unwrap().to_string()
+        }
+    }
+}
+
+#[tokio::test]
+async fn text_answers_use_both_inference_apis() {
+    for api in APIS {
+        let mut fake = FakeServer::start().await;
+        fake.answer(api.text_response("hello from the fake model"))
+            .await;
+        let (_, host, mut mailbox) =
+            start_agent(api, &fake, &format!("agent-text-{}", api.name())).await;
+        let id = send_text(&host, "say hello");
+        api.check_request(&fake.next_request().await);
+        assert_answer(&mut mailbox, &id, "hello from the fake model").await;
+        host.stop().await;
+    }
+}
+
+#[tokio::test]
+async fn tool_calls_pair_with_results_in_both_inference_apis() {
+    let args = json!({"path": "/actor"});
+    for api in APIS {
+        let mut fake = FakeServer::start().await;
+        fake.answer(api.tool_response("list-1", "list_dir", &args))
+            .await;
+        let (world, host, mut mailbox) =
+            start_agent(api, &fake, &format!("agent-tools-{}", api.name())).await;
+        let id = send_text(&host, "list actors");
+        api.check_request(&fake.next_request().await);
+        fake.answer(api.text_response("the actor list is ready"))
+            .await;
+        let second = fake.next_request().await;
+        api.check_request(&second);
+        let output = assert_tool_pair(&second, api, "list-1", "list_dir", &args);
+        let result: Value = serde_json::from_str(&output).unwrap();
+        assert!(
+            result["entries"]
+                .as_array()
+                .unwrap()
+                .iter()
+                .any(|entry| entry["name"] == "agent")
+        );
+        assert_answer(&mut mailbox, &id, "the actor list is ready").await;
+
+        let history = history(&world);
+        assert_eq!(
+            history
+                .iter()
+                .map(|entry| entry["kind"].as_str().unwrap())
+                .collect::<Vec<_>>(),
+            ["user", "tool_call", "tool_result", "assistant"]
+        );
+        assert_eq!(history[1]["id"], "list-1");
+        assert_eq!(history[2]["id"], "list-1");
+        host.stop().await;
+    }
+}
+
+#[tokio::test]
+async fn restart_resumes_a_turn_with_completed_tool_history() {
+    let args = json!({"path": "/actor"});
+    for api in [Api::OpenAi] {
+        let mut fake = FakeServer::start().await;
+        fake.answer(api.tool_response("list-1", "list_dir", &args))
+            .await;
+        let (world, host, mut mailbox) =
+            start_agent(api, &fake, &format!("agent-resume-{}", api.name())).await;
+        let id = send_text(&host, "list actors before the restart");
+        api.check_request(&fake.next_request().await);
+        let release = fake.hold(api.text_response("discarded response")).await;
+        let second = fake.next_request().await;
+        api.check_request(&second);
+        assert_tool_pair(&second, api, "list-1", "list_dir", &args);
+
+        let stopped = request(
+            &host,
+            &mut mailbox,
+            json!({"type": "stop", "actor": "agent"}),
+        )
+        .await;
+        assert_eq!(stopped.body["type"], "stopped");
+        assert_eq!(
+            serde_json::from_slice::<Value>(
+                &std::fs::read(world.data_dir("agent").join("turn.json")).unwrap()
+            )
+            .unwrap()["active"]["id"],
+            id
+        );
+        let _ = release.send(());
+        fake.answer(api.text_response("resumed answer")).await;
+        let start_id = host.broker.send(
+            "console",
+            Some("broker"),
+            None,
+            None,
+            json!({"type": "start", "actor": "agent"}),
+        );
+        let resumed = fake.next_request().await;
+        api.check_request(&resumed);
+        assert_tool_pair(&resumed, api, "list-1", "list_dir", &args);
+        let replies = receive_replies(
+            &mut mailbox,
+            &[start_id.clone(), id.clone()],
+            Duration::from_secs(20),
+        )
+        .await;
+        let started = replies
+            .iter()
+            .find(|reply| reply.reply_to.as_deref() == Some(start_id.as_str()))
+            .unwrap();
+        assert_eq!(started.body["type"], "started");
+        let answer = replies
+            .iter()
+            .find(|reply| reply.reply_to.as_deref() == Some(id.as_str()))
+            .unwrap();
+        assert_eq!(answer.body["text"], "resumed answer");
+
+        let history = history(&world);
+        assert_history_tools_have_results(&history);
+        assert_eq!(
+            history
+                .iter()
+                .filter(|entry| entry["kind"] == "user"
+                    && entry["text"].as_str().unwrap_or_default().contains(&id))
+                .count(),
+            1
+        );
+        host.stop().await;
+    }
+}
+
+#[tokio::test]
+async fn queued_text_resumes_after_the_active_turn_across_restart() {
+    let wait_args = json!({"seconds": 10});
+    for api in [Api::Anthropic] {
+        let mut fake = FakeServer::start().await;
+        fake.answer(api.tool_response("wait-1", "wait_for_messages", &wait_args))
+            .await;
+        let (world, host, mut mailbox) =
+            start_agent(api, &fake, &format!("agent-queue-{}", api.name())).await;
+        let first_id = send_text(&host, "first turn");
+        api.check_request(&fake.next_request().await);
+        let release = fake.hold(api.text_response("discarded response")).await;
+        let second_id = send_text(&host, "second turn");
+        let second_request = fake.next_request().await;
+        api.check_request(&second_request);
+        let output = assert_tool_pair(
+            &second_request,
+            api,
+            "wait-1",
+            "wait_for_messages",
+            &wait_args,
+        );
+        let queued: Value = serde_json::from_str(&output).unwrap();
+        assert!(
+            queued["messages"]
+                .as_array()
+                .unwrap()
+                .iter()
+                .any(|message| message["message"]["id"] == second_id)
+        );
+        let turn: Value = serde_json::from_slice(
+            &std::fs::read(world.data_dir("agent").join("turn.json")).unwrap(),
+        )
+        .unwrap();
+        assert_eq!(turn["queue"][0]["id"], second_id);
+
+        let stopped = request(
+            &host,
+            &mut mailbox,
+            json!({"type": "stop", "actor": "agent"}),
+        )
+        .await;
+        assert_eq!(stopped.body["type"], "stopped");
+        let _ = release.send(());
+        fake.answer(api.text_response("first answer")).await;
+        fake.answer(api.text_response("second answer")).await;
+        let start_id = host.broker.send(
+            "console",
+            Some("broker"),
+            None,
+            None,
+            json!({"type": "start", "actor": "agent"}),
+        );
+        let resumed_first = fake.next_request().await;
+        api.check_request(&resumed_first);
+        assert!(resumed_first.body.to_string().contains("first turn"));
+        let next_turn = fake.next_request().await;
+        api.check_request(&next_turn);
+        assert!(next_turn.body.to_string().contains("second turn"));
+
+        let replies = receive_replies(
+            &mut mailbox,
+            &[start_id.clone(), first_id.clone(), second_id.clone()],
+            Duration::from_secs(20),
+        )
+        .await;
+        let started = replies
+            .iter()
+            .find(|reply| reply.reply_to.as_deref() == Some(start_id.as_str()))
+            .unwrap();
+        assert_eq!(started.body["type"], "started");
+        let first_position = replies
+            .iter()
+            .position(|reply| reply.reply_to.as_deref() == Some(first_id.as_str()))
+            .unwrap();
+        let second_position = replies
+            .iter()
+            .position(|reply| reply.reply_to.as_deref() == Some(second_id.as_str()))
+            .unwrap();
+        assert!(first_position < second_position);
+        assert_eq!(replies[first_position].body["text"], "first answer");
+        assert_eq!(replies[second_position].body["text"], "second answer");
+        assert_history_tools_have_results(&history(&world));
+        host.stop().await;
+    }
+}