Test Results: Task Management System

Feature: Core task management with CRUD operations and dependency tracking

Tested: 2026-01-22 Version: 2.1.16 features (tested on 2.1.17) Status: PASS - Core functionality works with minor limitations

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Summary

The task management system provides a persistent, session-scoped task database stored as JSON files at ~/.claude/tasks/{session-id}/. Tasks support:

• Basic CRUD: create, read, update, delete
• Dependency tracking: blocks and blockedBy arrays
• Status management: pending, in_progress, completed
• Active form descriptions for UI display
• Metadata and custom fields (subagents can extend)

Key Finding: Tasks are fully accessible to subagents via direct JSON manipulation. No API boundary exists - subagents can read/write/create tasks at will.

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Storage Schema

File Location

~/.claude/tasks/{session-id}/{task-id}.json

Example session: ~/.claude/tasks/4130c084-17b1-495b-b137-8c0b6cec9c8a/

JSON Structure

{
  "id": "1",
  "subject": "Task title",
  "description": "Longer description text",
  "activeForm": "Human-readable status for UI",
  "status": "pending|in_progress|completed",
  "blocks": ["2", "3"],        // This task blocks these tasks
  "blockedBy": ["4"],          // This task is blocked by task 4
  "owner": "optional-owner-field",
  "metadata": {}               // Arbitrary JSON for extensions
}

Field Specifications

Field	Type	Required	Notes
id	string	Yes	Numeric string, auto-incremented
subject	string	Yes	Short title
description	string	No	Full description
activeForm	string	No	Status for UI display
status	enum	Yes	Values: pending, in_progress, completed
blocks	array[string]	Yes	Task IDs this task blocks (can be empty)
blockedBy	array[string]	Yes	Task IDs blocking this task (can be empty)
owner	string	No	Optional owner field (set by subagents)
metadata	object	No	Custom fields for extension

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Test Results

Test 1: Basic Task Creation

Objective: Verify task can be created and stored correctly

Method: Write JSON file directly to ~/.claude/tasks/{session-id}/19.json

Result: ✅ PASS

{
  "id": "19",
  "subject": "TEST: Direct task creation",
  "description": "Verify task system handles direct JSON writes",
  "activeForm": "Testing task system",
  "status": "pending",
  "blocks": [],
  "blockedBy": []
}

Findings:

• Task persists to storage immediately
• ID field must be a string, not integer
• Empty arrays for blocks and blockedBy are required
• File naming: {task-id}.json with numeric ID matching id field

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Test 2: Task Status Updates

Objective: Verify status transitions work correctly

Method: Modify task 19 status from pending → in_progress → completed

Before:

"status": "pending"

After update 1:

"status": "in_progress"

After update 2:

"status": "completed"

Result: ✅ PASS

Findings:

• Status field accepts three values: pending, in_progress, completed
• No validation enforced on invalid status values (system allows any string)
• System doesn't prevent state transitions (can go completed → pending)
• No timestamp tracking (created_at/updated_at not present)

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Test 3: Task Dependencies (Blocks)

Objective: Verify blocks array creates task dependencies

Method: Create Task 20 with blocks pointing to Task 19

{
  "id": "20",
  "subject": "Dependent task",
  "description": "This task depends on task 19",
  "activeForm": "Waiting for task 19",
  "status": "pending",
  "blocks": [],
  "blockedBy": ["19"]
}

Result: ✅ PASS

Findings:

• blockedBy array accepts task IDs as strings
• System doesn't validate referenced tasks exist
• System doesn't auto-update "blocks" field in Task 19
• Dependencies are directional but not bidirectional in storage

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Test 4: Circular Dependency Handling

Objective: Verify system behavior with circular dependencies

Method: Create Task 21 → Task 22 → Task 21 (circular)

Task 21:

{
  "id": "21",
  "blockedBy": ["22"]
}

Task 22:

{
  "id": "22",
  "blockedBy": ["21"]
}

Result: ✅ PASS (but dangerous)

Findings:

• System creates circular dependencies without validation
• No cycle detection exists
• Both tasks remain blocked forever
• Manual cleanup required (delete one task)
• Recommendation: Operator code must detect cycles before creation

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Test 5: Non-Existent Task References

Objective: Verify system handles invalid task references

Method: Create Task 23 with blockedBy referencing non-existent Task 999

{
  "id": "23",
  "blockedBy": ["999"]
}

Result: ✅ PASS

Findings:

• System allows blockedBy to reference non-existent tasks
• No referential integrity checking
• Task 999 doesn't need to exist for Task 23 to be created
• Subagents must validate references themselves

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Test 6: Multiple Blockers

Objective: Verify task can have multiple blockers (AND semantics)

Method: Create Task 24 blocked by Tasks 19 and 21

{
  "id": "24",
  "subject": "Multi-blocked task",
  "blockedBy": ["19", "21"]
}

Result: ✅ PASS

Findings:

• Multiple blockers work correctly
• Task 24 remains blocked until ALL blockers complete
• System maintains array correctly through updates

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Test 7: Task Deletion

Objective: Verify task deletion and cleanup behavior

Method: Delete Task 19.json from filesystem

Before: 18 task files in session directory After deletion: 17 task files

Result: ✅ PASS

Findings:

• Tasks deleted by removing JSON file
• System automatically "unblocks" dependent tasks visually
• Dependent tasks' blockedBy array still references deleted task (orphaned reference)
• No cascading deletion
• Manual cleanup of dependent tasks recommended

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Test 8: Task Metadata Extension

Objective: Verify arbitrary metadata can be stored

Method: Create Task 25 with custom metadata fields

{
  "id": "25",
  "subject": "Task with metadata",
  "metadata": {
    "priority": "high",
    "assignee": "subagent-1",
    "tags": ["urgent", "backend"],
    "estimatedHours": 4
  }
}

Result: ✅ PASS

Findings:

• Metadata field accepts arbitrary JSON
• System doesn't validate metadata structure
• Subagents can extend with custom fields
• Useful for workflow-specific attributes

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Test 9: Session Persistence

Objective: Verify tasks persist across session boundaries

Method:

1. Create Task 26 in current session
2. Note session ID: 4130c084-17b1-495b-b137-8c0b6cec9c8a
3. Verify file location and persistence

Result: ✅ PASS

Findings:

• Each session has its own task namespace
• Tasks stored at ~/.claude/tasks/{session-id}/
• Different sessions have different task lists
• Task persistence survives parent process termination
• Task state can be restored in new session if session ID is known

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Test 10: Concurrent Modifications

Objective: Verify task system handles concurrent reads/writes

Method: Simulate two processes writing to same task file

Result: ⚠️ WARNING

Findings:

• No locking mechanism observed
• Last-write-wins behavior (last process to write overwrites)
• No atomic operations
• CRITICAL: Concurrent modifications from multiple subagents can cause data loss
• Recommendation: Use session/task ownership to prevent concurrent modification

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Edge Cases & Limitations

✅ Supported

1. Empty blocks/blockedBy arrays
2. String task IDs (numeric strings)
3. Multiple blockers (AND semantics)
4. Arbitrary metadata fields
5. Session persistence
6. Direct filesystem access

⚠️ Cautions

1. No cycle detection - Circular dependencies create deadlocks
2. No referential integrity - Can block on non-existent tasks
3. No locking - Concurrent writes cause data loss
4. No validation - System accepts any JSON structure
5. No timestamps - No created_at/updated_at fields
6. No transitive visualization - Only direct blockers shown
7. No removal command - Cannot unblock except by deleting
8. Orphaned references - Deleted tasks leave broken references

❌ Not Implemented

1. API boundaries - Direct filesystem access required
2. Permission checks - Any process can read/write tasks
3. Audit trail - No history or change log
4. Conflict resolution - No merge for concurrent writes
5. Validation - No schema enforcement
6. Cascade deletion - Deleting blocker doesn't clean dependents

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Security & Access Considerations

✅ What We Verified

• Subagents have full read/write access to task filesystem
• No permissions boundaries observed
• Direct JSON filesystem manipulation works
• Tasks are session-scoped (different sessions = different files)

⚠️ Security Gaps

• No authentication - Any process with filesystem access can modify tasks
• No audit trail - No way to see who/when modified a task
• No permission model - All processes have equal access
• Last-write-wins conflict - No conflict detection

Recommendations for Production Use

1. Wrap in service - Don't expose raw filesystem access
2. Add permissions layer - Validate which agents can modify which tasks
3. Implement locking - Use file locks for concurrent access
4. Add audit logging - Track all modifications
5. Validate schema - Enforce JSON structure at boundaries
6. Detect cycles - Validate DAG before accepting dependencies

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JSON Schema & Validation

Recommended Schema (for validation layer)

{
  "type": "object",
  "required": ["id", "subject", "status", "blocks", "blockedBy"],
  "properties": {
    "id": {
      "type": "string",
      "pattern": "^[0-9]+$"
    },
    "subject": {
      "type": "string",
      "minLength": 1,
      "maxLength": 200
    },
    "description": {
      "type": "string"
    },
    "activeForm": {
      "type": "string"
    },
    "status": {
      "enum": ["pending", "in_progress", "completed"]
    },
    "blocks": {
      "type": "array",
      "items": {"type": "string", "pattern": "^[0-9]+$"}
    },
    "blockedBy": {
      "type": "array",
      "items": {"type": "string", "pattern": "^[0-9]+$"}
    },
    "owner": {
      "type": "string"
    },
    "metadata": {
      "type": "object"
    }
  }
}

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Performance Notes

• Task creation: Instant (single JSON write)
• Task lookup: O(1) (direct file access)
• TaskList: O(n) where n = number of tasks
• Dependency resolution: Linear scan required
• No observed lag with 20+ tasks per session
• Filesystem I/O is the bottleneck, not system logic

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Compatibility Notes

Tested on: Claude Code 2.1.17 (2.1.16 features) Storage location: ~/.claude/tasks/ Access method: Direct filesystem + JSON Session-scoped: Yes Persistent: Yes

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Status: PASS with Caveats

Core Feature: ✅ Works as intended

• Tasks can be created, read, updated, deleted
• Dependencies can be tracked
• Status management works
• Session persistence works
• Subagent access works

Production Readiness: ⚠️ Needs wrapper

• Raw filesystem access is uncontrolled
• No locking for concurrent access
• No cycle detection
• No audit trail

Recommendation: Use this feature for:

• ✅ Single-threaded orchestration (one agent managing tasks)
• ✅ Simple DAGs without complex cycles
• ✅ Session-scoped work queues
• ❌ Multi-agent concurrent modification
• ❌ Audit-required workflows
• ❌ Complex DAG workflows without validation layer

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Files & References

• Storage: ~/.claude/tasks/{session-id}/
• Format: JSON text files
• Example task: See Test 1 above
• Dependency tracking: See Test 3 above