diff --git a/components/spider-core/src/types/id.rs b/components/spider-core/src/types/id.rs
index 21821e7e5..4735f798c 100644
--- a/components/spider-core/src/types/id.rs
+++ b/components/spider-core/src/types/id.rs
@@ -4,6 +4,8 @@ use serde::{Deserialize, Serialize};
 use sqlx::{Database, encode::IsNull};
 use uuid::Uuid;
 
+use crate::task::TaskIndex;
+
 /// A generic identifier type that wraps a UUID and a type marker.
 ///
 /// # Type Parameters:
@@ -96,9 +98,18 @@ pub type UuidBytes = uuid::Bytes;
 pub enum ResourceGroupIdMarker {}
 pub type ResourceGroupId = Id<ResourceGroupIdMarker>;
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub enum TaskIdMarker {}
-pub type TaskId = Id<TaskIdMarker>;
+/// Identifier of a task inside a job.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub enum TaskId {
+    /// The index of the task in the job's task graph.
+    Index(TaskIndex),
+
+    /// The commit task.
+    Commit,
+
+    /// The cleanup task.
+    Cleanup,
+}
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum JobIdMarker {}
@@ -169,33 +180,3 @@ where
 }
 
 pub type SignedJobId = SignedId<JobIdMarker>;
-
-pub type SignedTaskId = SignedId<TaskIdMarker>;
-
-#[cfg(test)]
-mod tests {
-    use std::any::TypeId;
-
-    use super::*;
-
-    #[test]
-    fn test_id_basic() {
-        let id = TaskId::new();
-        let underlying_uuid = id.as_uuid_ref().to_owned();
-        assert_eq!(id, TaskId::from(underlying_uuid));
-
-        assert_ne!(TypeId::of::<TaskId>(), TypeId::of::<JobId>());
-    }
-
-    #[test]
-    fn task_id_json_roundtrip() {
-        let id = TaskId::new();
-        let deserialized_id: TaskId = serde_json::from_str(
-            serde_json::to_string(&id)
-                .expect("JSON serialization failure")
-                .as_str(),
-        )
-        .expect("JSON deserialization failure");
-        assert_eq!(id, deserialized_id);
-    }
-}
diff --git a/components/spider-storage/src/cache.rs b/components/spider-storage/src/cache.rs
index d520f519e..89a5e13d6 100644
--- a/components/spider-storage/src/cache.rs
+++ b/components/spider-storage/src/cache.rs
@@ -1,21 +1,6 @@
-use spider_core::task::TaskIndex;
-
 pub mod error;
 pub mod io;
 pub mod job;
 pub mod job_submission;
 mod sync;
 pub mod task;
-
-/// Identifier of a task inside a job.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub enum TaskId {
-    /// The index of the task in the job's task graph.
-    Index(TaskIndex),
-
-    /// The commit task.
-    Commit,
-
-    /// The cleanup task.
-    Cleanup,
-}
diff --git a/components/spider-storage/src/cache/job.rs b/components/spider-storage/src/cache/job.rs
index 5c575e8ee..c5a06ccba 100644
--- a/components/spider-storage/src/cache/job.rs
+++ b/components/spider-storage/src/cache/job.rs
@@ -10,7 +10,7 @@ use spider_core::{
     job::JobState,
     task::{TaskIndex, TaskState},
     types::{
-        id::{ExecutionManagerId, JobId, ResourceGroupId, TaskInstanceId},
+        id::{ExecutionManagerId, JobId, ResourceGroupId, TaskId, TaskInstanceId},
         io::{ExecutionContext, TaskOutput},
     },
 };
@@ -18,7 +18,6 @@ use tokio::sync::{RwLockReadGuard, RwLockWriteGuard};
 
 use crate::{
     cache::{
-        TaskId,
         error::{CacheError, InternalError, InternalError::UnexpectedJobState, StaleStateError},
         job_submission::ValidatedJobSubmission,
         task::TaskGraph,
diff --git a/components/spider-storage/src/task_instance_pool.rs b/components/spider-storage/src/task_instance_pool.rs
index ace45ce60..bba0cf773 100644
--- a/components/spider-storage/src/task_instance_pool.rs
+++ b/components/spider-storage/src/task_instance_pool.rs
@@ -23,12 +23,11 @@ use std::{
 };
 
 use async_trait::async_trait;
-use spider_core::types::id::{ExecutionManagerId, JobId, ResourceGroupId, TaskInstanceId};
+use spider_core::types::id::{ExecutionManagerId, JobId, ResourceGroupId, TaskId, TaskInstanceId};
 use tokio::sync::mpsc;
 
 use crate::{
     cache::{
-        TaskId,
         error::InternalError,
         task::{SharedTaskControlBlock, SharedTerminationTaskControlBlock},
     },
diff --git a/components/spider-storage/tests/scheduling_infra.rs b/components/spider-storage/tests/scheduling_infra.rs
index d3e5eb981..046a35eb9 100644
--- a/components/spider-storage/tests/scheduling_infra.rs
+++ b/components/spider-storage/tests/scheduling_infra.rs
@@ -87,13 +87,12 @@ use spider_core::{
     job::JobState,
     task::TaskIndex,
     types::{
-        id::{ExecutionManagerId, JobId, ResourceGroupId, TaskInstanceId},
+        id::{ExecutionManagerId, JobId, ResourceGroupId, TaskId, TaskInstanceId},
         io::{ExecutionContext, TaskOutput},
     },
 };
 use spider_storage::{
     cache::{
-        TaskId,
         error::{CacheError, InternalError},
         job::SharedJobControlBlock,
         job_submission::ValidatedJobSubmission,
diff --git a/components/spider-tdl/src/task.rs b/components/spider-tdl/src/task.rs
index 99ca904d4..d4015e0c6 100644
--- a/components/spider-tdl/src/task.rs
+++ b/components/spider-tdl/src/task.rs
@@ -254,7 +254,7 @@ mod tests {
     fn make_encoded_ctx() -> Vec<u8> {
         let ctx = TaskContext {
             job_id: JobId::new(),
-            task_id: TaskId::new(),
+            task_id: TaskId::Index(0),
             task_instance_id: 1,
             resource_group_id: ResourceGroupId::new(),
         };
diff --git a/components/spider-tdl/src/task_context.rs b/components/spider-tdl/src/task_context.rs
index 603483153..d412bdb46 100644
--- a/components/spider-tdl/src/task_context.rs
+++ b/components/spider-tdl/src/task_context.rs
@@ -31,7 +31,7 @@ mod tests {
     fn round_trip_msgpack() -> anyhow::Result<()> {
         let ctx = TaskContext {
             job_id: JobId::new(),
-            task_id: TaskId::new(),
+            task_id: TaskId::Index(0),
             task_instance_id: 13,
             resource_group_id: ResourceGroupId::new(),
         };
diff --git a/components/spider-tdl/tests/test_task_macro.rs b/components/spider-tdl/tests/test_task_macro.rs
index e2a070feb..9a891f190 100644
--- a/components/spider-tdl/tests/test_task_macro.rs
+++ b/components/spider-tdl/tests/test_task_macro.rs
@@ -81,7 +81,7 @@ fn translate(_ctx: TaskContext, p: Point, dx: int32, dy: int32) -> Result<(Point
 fn make_encoded_ctx() -> Vec<u8> {
     let ctx = TaskContext {
         job_id: JobId::new(),
-        task_id: TaskId::new(),
+        task_id: TaskId::Index(0),
         task_instance_id: 1,
         resource_group_id: ResourceGroupId::new(),
     };
@@ -303,7 +303,7 @@ fn direct_execute_call_round_trips() -> anyhow::Result<()> {
 
     let ctx = TaskContext {
         job_id: JobId::new(),
-        task_id: TaskId::new(),
+        task_id: TaskId::Index(0),
         task_instance_id: 1,
         resource_group_id: ResourceGroupId::new(),
     };
diff --git a/tests/huntsman/task-executor/tests/test_process_pool.rs b/tests/huntsman/task-executor/tests/test_process_pool.rs
index 7983285b3..e646352f8 100644
--- a/tests/huntsman/task-executor/tests/test_process_pool.rs
+++ b/tests/huntsman/task-executor/tests/test_process_pool.rs
@@ -78,7 +78,7 @@ fn build_pool() -> ProcessPool {
 fn make_request(task_func: &str, inputs: Vec<TaskInput>) -> ExecuteRequest {
     ExecuteRequest {
         job_id: JobId::new(),
-        task_id: TaskId::new(),
+        task_id: TaskId::Index(0),
         resource_group_id: ResourceGroupId::new(),
         ctx: ExecutionContext {
             task_instance_id: 1,
diff --git a/tests/huntsman/tdl-integration/tests/complex.rs b/tests/huntsman/tdl-integration/tests/complex.rs
index 513e7d75e..0e2bc7d51 100644
--- a/tests/huntsman/tdl-integration/tests/complex.rs
+++ b/tests/huntsman/tdl-integration/tests/complex.rs
@@ -33,7 +33,7 @@ fn lib_path() -> std::path::PathBuf {
 fn encode_ctx() -> Vec<u8> {
     let ctx = TaskContext {
         job_id: JobId::new(),
-        task_id: TaskId::new(),
+        task_id: TaskId::Index(0),
         task_instance_id: 1,
         resource_group_id: ResourceGroupId::new(),
     };
diff --git a/tests/huntsman/test-utils/src/executor.rs b/tests/huntsman/test-utils/src/executor.rs
index 43ae646fb..24f8db5f3 100644
--- a/tests/huntsman/test-utils/src/executor.rs
+++ b/tests/huntsman/test-utils/src/executor.rs
@@ -192,7 +192,7 @@ pub fn tdl_package_dir() -> PathBuf {
 pub fn build_ctx() -> Vec<u8> {
     let ctx = TaskContext {
         job_id: JobId::new(),
-        task_id: TaskId::new(),
+        task_id: TaskId::Index(0),
         task_instance_id: 1,
         resource_group_id: ResourceGroupId::new(),
     };