diff --git a/client/src/commands.rs b/client/src/commands.rs
index e826e9a..3b25ea2 100644
--- a/client/src/commands.rs
+++ b/client/src/commands.rs
@@ -1088,6 +1088,16 @@ async fn job(
             let Some(permslip_url) = permslip_url else {
                 return Err(CommandError::MissingPermslipUrl);
             };
+            // Sign an interactive job for the sled its attachment
+            // will land on.
+            let target = if *interactive && target.single_baseboard().is_none() {
+                let Some(client) = client.as_ref() else {
+                    return Err(CommandError::InteractiveTarget);
+                };
+                Target::from(resolve_target(client, target).await?)
+            } else {
+                target.clone()
+            };
             let mut signer = PermslipSigner::new(key_name, permslip_url).await?;
             let mut interval = interval(SIGNING_UPDATE_INTERVAL);
             interval.set_missed_tick_behavior(MissedTickBehavior::Skip);
@@ -1095,7 +1105,7 @@ async fn job(
                 job_id.to_owned(),
                 command,
                 *interactive,
-                target.clone(),
+                target,
             ));
             pin!(sign);
             ctx.job_signing_started(&job_id);
@@ -1842,6 +1852,8 @@ pub enum CommandError {
     IdentityMismatch { interactive: KeyId, key_id: KeyId },
     #[error("❌ Interactive job error: {0}")]
     Interactive(#[from] InteractiveJobError),
+    #[error("❌ Interactive jobs must target exactly one sled")]
+    InteractiveTarget,
     #[error("❌ I/O error accessing `{path}`: {error}")]
     Io {
         path: PathBuf,
diff --git a/common/src/jobs.rs b/common/src/jobs.rs
index 2cf079c..f2fc2e6 100644
--- a/common/src/jobs.rs
+++ b/common/src/jobs.rs
@@ -28,7 +28,7 @@ use crate::borsh::{
 };
 use crate::interactive::InteractiveJobError;
 use crate::keys::{KeyId, Signed, ToBeSigned, Verified};
-use crate::targets::Target;
+use crate::targets::{Cubbies, Target};
 
 codephrase_newtype! {
     /// A globally unique identifier for a job within a session.
@@ -211,6 +211,15 @@ impl JobStartRequest {
         }
     }
 
+    /// Interactive jobs run only on their single named baseboard.
+    pub fn runs_on(&self, baseboard: &BaseboardId, cubbies: &Cubbies) -> bool {
+        if self.interactive {
+            self.target.single_baseboard() == Some(baseboard)
+        } else {
+            self.target.includes(baseboard, cubbies)
+        }
+    }
+
     pub fn job_id(&self) -> &JobId {
         &self.job_id
     }
@@ -715,6 +724,29 @@ impl FromStr for JobOutputStream {
 #[cfg(test)]
 mod test {
     use super::*;
+    use crate::targets::SledId;
+
+    /// Interactive jobs run only on their single named baseboard.
+    #[test]
+    fn interactive_targets() {
+        let sled = |serial: &str| BaseboardId {
+            part_number: "913".to_string(),
+            serial_number: serial.to_string(),
+        };
+        let me = sled("me");
+        let cubbies = Cubbies::from([(14, me.clone())]);
+        let job = |interactive, target| {
+            JobStartRequest::new(JobId::random(), "true", interactive, target)
+        };
+        let just_me = Target::Sleds(vec![SledId::Baseboard(me.clone())]);
+        assert!(job(true, just_me.clone()).runs_on(&me, &cubbies));
+        assert!(job(false, just_me).runs_on(&me, &cubbies));
+        assert!(!job(true, Target::All).runs_on(&me, &cubbies));
+        assert!(job(false, Target::All).runs_on(&me, &cubbies));
+        let my_cubby = Target::Sleds(vec![SledId::Cubby(14)]);
+        assert!(!job(true, my_cubby.clone()).runs_on(&me, &cubbies));
+        assert!(job(false, my_cubby).runs_on(&me, &cubbies));
+    }
 
     /// Requested limits may narrow the default ceiling, never widen it.
     #[test]
diff --git a/common/src/targets.rs b/common/src/targets.rs
index b4cfde8..0a866f2 100644
--- a/common/src/targets.rs
+++ b/common/src/targets.rs
@@ -74,6 +74,23 @@ impl Target {
     pub fn is_all(&self) -> bool {
         matches!(self, Self::All)
     }
+
+    /// A singular target or `None`.
+    pub fn single_baseboard(&self) -> Option<&BaseboardId> {
+        match self {
+            Self::All => None,
+            Self::Sleds(sleds) => match sleds.as_slice() {
+                [SledId::Baseboard(baseboard)] => Some(baseboard),
+                _ => None,
+            },
+        }
+    }
+}
+
+impl From<BaseboardId> for Target {
+    fn from(baseboard: BaseboardId) -> Self {
+        Self::Sleds(vec![SledId::Baseboard(baseboard)])
+    }
 }
 
 impl FromStr for Target {
diff --git a/server/src/error.rs b/server/src/error.rs
index 619e93f..95455fb 100644
--- a/server/src/error.rs
+++ b/server/src/error.rs
@@ -38,6 +38,8 @@ pub enum JobError {
     InteractiveJob(#[from] InteractiveJobError),
     #[error("Command must not start with `-`")]
     InvalidCommand,
+    #[error("Interactive jobs must target exactly one sled")]
+    InteractiveTarget,
     #[error("Invalid range for output of length {0}")]
     InvalidRange(u64),
     #[error("I/O error during {what}: {error}")]
@@ -176,7 +178,8 @@ impl From<JobError> for HttpError {
             | SessionNotCurrent(_) => {
                 HttpError::for_client_error(None, ClientErrorStatusCode::NOT_FOUND, message)
             }
-            DecodeCert(_) | DuplicateJobId(_) | InvalidCommand | Json(_) | MultipleSessions => {
+            DecodeCert(_) | DuplicateJobId(_) | InteractiveTarget | InvalidCommand | Json(_)
+            | MultipleSessions => {
                 HttpError::for_client_error(None, ClientErrorStatusCode::BAD_REQUEST, message)
             }
         }
diff --git a/server/src/manager.rs b/server/src/manager.rs
index c60d1f1..d5f114e 100644
--- a/server/src/manager.rs
+++ b/server/src/manager.rs
@@ -597,6 +597,12 @@ impl JobManager {
             return Err(JobError::NoSession);
         }
 
+        // A broader target would orphan jobs on unattached sleds.
+        let payload = job.payload();
+        if payload.interactive && payload.target().single_baseboard().is_none() {
+            return Err(JobError::InteractiveTarget);
+        }
+
         // Reject job IDs we already know about, rather than silently
         // queuing a resubmission that can never advance the session's
         // job chain. Without this, a caller that resubmits an
diff --git a/server/src/state.rs b/server/src/state.rs
index e4a0299..202ab9c 100644
--- a/server/src/state.rs
+++ b/server/src/state.rs
@@ -203,7 +203,7 @@ impl<'a> SessionGuard<'a> {
         actor: &KeyId,
     ) {
         let job_id = *job.job_id();
-        let targeted = job.payload().target().includes(own_baseboard, cubbies);
+        let targeted = job.payload().runs_on(own_baseboard, cubbies);
         if history.contains(&job_id) {
             // Note but otherwise ignore the duplicate job.
             info!(log, "already started job"; "job_id" => %job_id);
@@ -277,7 +277,7 @@ impl<'a> SessionGuard<'a> {
         while let Some((request, params)) = self.next_queued_job() {
             let (tx_attachment, rx_attachment) = watch::channel(None);
             let job_id = request.payload().job_id().to_owned();
-            if request.payload().target().includes(own_baseboard, cubbies)
+            if request.payload().runs_on(own_baseboard, cubbies)
                 && history
                     .get_job_status(&job_id)
                     .map(|status| {
diff --git a/tests/src/integration_tests.rs b/tests/src/integration_tests.rs
index 247a21c..e7c6fdc 100644
--- a/tests/src/integration_tests.rs
+++ b/tests/src/integration_tests.rs
@@ -207,7 +207,7 @@ async fn client_proxy_server() {
         .expect("can't start session");
     let job_id = session.next_job_id();
     let job = root
-        .sign_job_request(&job_id, "cat > /dev/null", true)
+        .sign_job_request_for(&job_id, "cat > /dev/null", true, test_baseboard_id().into())
         .await;
     let JobLimits {
         max_cpu,
@@ -556,7 +556,7 @@ async fn interactive_job() {
         .expect("can't start session");
     let job_id = session.next_job_id();
     let job = root
-        .sign_job_request(&job_id, "cat > /dev/null", true)
+        .sign_job_request_for(&job_id, "cat > /dev/null", true, test_baseboard_id().into())
         .await;
     let JobLimits {
         max_cpu,
diff --git a/tests/src/manager_tests.rs b/tests/src/manager_tests.rs
index 6418129..c0c81d6 100644
--- a/tests/src/manager_tests.rs
+++ b/tests/src/manager_tests.rs
@@ -2110,3 +2110,23 @@ async fn job_signal_dispositions() {
     let stdout = String::from_utf8(stdout.to_vec()).unwrap();
     assert!(stdout.contains("caught"), "stdout: {stdout:?}");
 }
+
+/// Interactive jobs must target exactly one sled.
+#[named]
+#[tokio::test]
+async fn interactive_target_required() {
+    let log = test_logger(function_name!());
+    let (mgr, mut root, _dir, _shutdown) = manager_and_test_root(log).await;
+    let authn = fake_identity(&mut root).await;
+    let session_id = SessionId::random();
+    let session = Session::new(session_id);
+    mgr.session_start(&authn, session_id, true).await.unwrap();
+
+    let job_id = session.next_job_id();
+    let job = root.sign_job_request(&job_id, "bash", true).await;
+    assert!(matches!(
+        mgr.job_start(&authn, job.into_signed(), JobStartParams::default())
+            .await,
+        Err(JobError::InteractiveTarget)
+    ));
+}