claude-code-tasks

分类: 工具与效率 | 上传者: sequenzia | 下载: 0 | 版本: v1.0（最新）
Reference for Claude Code Tasks — tool parameters, status lifecycle, dependency management, and conventions
更新日志: Source: GitHub https://github.com/sequenzia/agent-alchemy
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📁 references/
- 📄 anti-patterns.md 12.7 KB
- 📄 task-patterns.md 18.5 KB
📄 SKILL.md 11.2 KB
SKILL.md

---
name: claude-code-tasks
description: Reference for Claude Code Tasks — tool parameters, status lifecycle, dependency management, and conventions
user-invocable: false
disable-model-invocation: false
last-verified: 2026-02-23
---

# Claude Code Tasks Reference

This skill is a shared reference for Claude Code's Task tools: **TaskCreate**, **TaskGet**, **TaskUpdate**, and **TaskList**. Load it when your skill or agent needs to create, manage, or coordinate tasks.

This reference covers:
- Complete tool parameter tables for all four Task tools
- Status lifecycle and transition rules
- Naming conventions (subject vs. activeForm)
- Dependency management with DAG design principles
- Metadata conventions for categorization and tracking

For deeper content, load the reference files listed at the end of this document.

---

## TaskCreate

Creates a new task. Returns the created task object with a system-assigned `id`.

### Parameters

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| `subject` | string | Yes | Short imperative title for the task (e.g., "Create user schema"). Displayed in the task list UI. |
| `description` | string | No | Detailed description of what the task involves. Supports markdown. Used to convey acceptance criteria, context, and instructions. |
| `activeForm` | string | No | Present-continuous description shown while the task is in progress (e.g., "Creating user schema"). Displayed in the task list UI during execution. |
| `metadata` | object | No | Key-value pairs for categorization and tracking. Keys and values are strings. Common keys documented in the Metadata Conventions section below. |

### Return Value

Returns the full task object including:
- `id` — System-assigned unique identifier (integer)
- `subject` — The subject provided
- `description` — The description provided (if any)
- `activeForm` — The activeForm provided (if any)
- `status` — Always `pending` for newly created tasks
- `metadata` — The metadata provided (if any)
- `blockedBy` — Empty array (no dependencies yet)
- `blocks` — Empty array (no dependents yet)

### Example

```
TaskCreate:
  subject: "Create user authentication module"
  description: "Implement JWT-based auth with login, logout, and token refresh endpoints."
  activeForm: "Creating user authentication module"
  metadata:
    priority: "high"
    complexity: "medium"
    task_group: "user-auth"
```

---

## TaskGet

Retrieves a single task by its ID. Use this to get full task details including description, metadata, and dependency information.

### Parameters

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| `taskId` | integer | Yes | The ID of the task to retrieve. |

### Return Value

Returns the full task object:
- `id` — Task identifier
- `subject` — Task title
- `description` — Full description (may be long)
- `activeForm` — Present-continuous form (if set)
- `status` — Current status (`pending`, `in_progress`, `completed`, `deleted`)
- `metadata` — Key-value pairs
- `blockedBy` — Array of task IDs this task depends on
- `blocks` — Array of task IDs that depend on this task
- `owner` — The agent or session that owns this task (if set)

---

## TaskUpdate

Updates an existing task. Only the fields you provide are changed; omitted fields remain unchanged.

### Parameters

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| `taskId` | integer | Yes | The ID of the task to update. |
| `status` | string | No | New status. Valid values: `pending`, `in_progress`, `completed`, `deleted`. See Status Lifecycle below. |
| `subject` | string | No | Updated subject line. |
| `description` | string | No | Updated description. |
| `activeForm` | string | No | Updated present-continuous description. |
| `owner` | string | No | Set or change the task owner (agent name or session identifier). |
| `metadata` | object | No | Replace the entire metadata object. Merges are not supported — provide the full metadata object. |
| `addBlocks` | integer[] | No | Add task IDs to this task's `blocks` list (tasks that depend on this one). |
| `addBlockedBy` | integer[] | No | Add task IDs to this task's `blockedBy` list (tasks this one depends on). |

### Return Value

Returns the updated task object with all current fields.

### Example

```
TaskUpdate:
  taskId: 5
  status: "in_progress"
  activeForm: "Implementing user authentication module"
```

---

## TaskList

Lists all tasks in the current task list. Takes no parameters.

### Parameters

None.

### Return Value

Returns an array of task summary objects. Each summary includes:
- `id` — Task identifier
- `subject` — Task title
- `status` — Current status
- `blockedBy` — Array of blocking task IDs
- `blocks` — Array of dependent task IDs
- `metadata` — Key-value pairs

Note: TaskList returns summary objects. Use TaskGet to retrieve the full `description` for a specific task.

---

## Status Lifecycle

Tasks follow a simple three-state lifecycle with an additional terminal state.

```
pending --> in_progress --> completed
   |
   +--> deleted
```

### States

| Status | Meaning | Entry Condition |
|--------|---------|-----------------|
| `pending` | Task is created and waiting to be started | Default on creation via TaskCreate |
| `in_progress` | Task is actively being worked on | Explicitly set via TaskUpdate |
| `completed` | Task is finished | Explicitly set via TaskUpdate |
| `deleted` | Task is removed (soft delete) | Explicitly set via TaskUpdate |

### Transition Rules

- **pending -> in_progress**: Set when an agent begins working on the task.
- **in_progress -> completed**: Set when the task is verified as done. Only mark complete after verification passes.
- **in_progress -> pending**: Valid for resetting a task (e.g., after a failed attempt or interrupted session).
- **pending -> deleted**: Remove a task that is no longer needed.
- **in_progress -> deleted**: Cancel a task that is in progress.
- **Blocked tasks**: A task with non-empty `blockedBy` (where blockers are not yet completed) should not be started. The system does not enforce this automatically — your orchestration logic must check dependencies before transitioning to `in_progress`.

---

## Naming Conventions

### Subject (Imperative)

The `subject` field uses **imperative mood** — a command that describes what the task will accomplish:

| Good | Bad |
|------|-----|
| "Create user schema" | "Creating user schema" |
| "Add JWT authentication" | "JWT authentication addition" |
| "Fix login timeout bug" | "Login timeout bug" |
| "Implement rate limiting" | "Rate limiting implementation" |

### activeForm (Present-Continuous)

The `activeForm` field uses **present-continuous tense** — describing what is happening while the task runs:

| Subject | activeForm |
|---------|------------|
| "Create user schema" | "Creating user schema" |
| "Add JWT authentication" | "Adding JWT authentication" |
| "Fix login timeout bug" | "Fixing login timeout bug" |
| "Implement rate limiting" | "Implementing rate limiting" |

The `activeForm` appears in the task list UI while the task status is `in_progress`. If omitted, the UI falls back to the `subject`.

---

## Dependency Management

Tasks support dependency tracking via `blockedBy` and `blocks` fields, forming a **Directed Acyclic Graph (DAG)**.

### Fields

- **`blockedBy`**: Array of task IDs that must complete before this task can start. Set via `addBlockedBy` in TaskUpdate.
- **`blocks`**: Array of task IDs that are waiting on this task. Set via `addBlocks` in TaskUpdate. This is the inverse of `blockedBy`.

### Setting Dependencies

Dependencies are set after task creation using TaskUpdate:

```
TaskUpdate:
  taskId: 5
  addBlockedBy: [3, 4]
```

This means task 5 cannot start until tasks 3 and 4 are both completed.

### DAG Design Principles

1. **No cycles**: Never create circular dependencies (A blocks B, B blocks C, C blocks A). This creates deadlocks where no task can proceed.
2. **Minimize depth**: Prefer wider, shallower dependency graphs. Deep chains (A -> B -> C -> D -> E) serialize execution and slow throughput.
3. **Depend on producers, not peers**: A task should depend on the task that produces what it needs, not on unrelated tasks at the same level.
4. **One-way information flow**: Dependencies should follow the data flow — upstream tasks produce artifacts that downstream tasks consume.
5. **Independent tasks run in parallel**: Tasks at the same dependency level (no dependencies between them) can execute concurrently.

### Common Dependency Patterns

| Pattern | Structure | Use Case |
|---------|-----------|----------|
| Linear chain | A -> B -> C | Sequential steps where each builds on the previous |
| Fan-out | A -> [B, C, D] | One task produces input for multiple parallel tasks |
| Fan-in | [A, B, C] -> D | Multiple tasks must complete before a summary/merge task |
| Diamond | A -> [B, C] -> D | Fan-out followed by fan-in; B and C are independent but D needs both |

---

## Metadata Conventions

The `metadata` field accepts arbitrary string key-value pairs. These common keys are used across the agent-alchemy ecosystem:

| Key | Values | Purpose |
|-----|--------|---------|
| `priority` | `critical`, `high`, `medium`, `low`, `unprioritized` | Execution ordering within a wave; higher priority tasks run first |
| `complexity` | `trivial`, `low`, `medium`, `high` | Estimate of implementation effort; used for planning |
| `task_group` | Any string (e.g., `user-auth`, `payments`) | Groups related tasks for filtered execution via `--task-group` |
| `spec_path` | File path (e.g., `internal/specs/auth-SPEC.md`) | Links the task back to its source specification |
| `feature_name` | Any string (e.g., `user-authentication`) | Associates the task with a feature for tracking |
| `task_uid` | Composite key (e.g., `auth:create-schema`) | Enables idempotent merge mode — matching UIDs update existing tasks instead of creating duplicates |
| `spec_phase` | Phase identifier (e.g., `phase-1`) | Tracks which spec phase generated this task |
| `source_section` | Section reference (e.g., `Section 5.1`) | Links to the specific spec section that defined this task |

### Metadata Replacement Behavior

TaskUpdate's `metadata` field performs a **full replacement**, not a merge. To add a single key, you must read the existing metadata first, add the key, and provide the complete object:

```
TaskGet: taskId=5
# Returns metadata: { priority: "high", task_group: "auth" }

TaskUpdate:
  taskId: 5
  metadata:
    priority: "high"
    task_group: "auth"
    complexity: "medium"
```

---

## Reference Files

For deeper content on task design patterns and common mistakes, load these reference files:

### Task Patterns

Covers dependency graph design patterns (linear, fan-out, fan-in, diamond), task right-sizing guidance, multi-agent coordination via tasks, and metadata strategies.

```
Read ${CLAUDE_PLUGIN_ROOT}/skills/claude-code-tasks/references/task-patterns.md
```

### Anti-Patterns

Documents common mistakes when using Tasks: circular dependencies, over-granular tasks, missing activeForm, batch status update pitfalls, duplicate task creation, and more. Each anti-pattern includes the problem, why it matters, and the correct alternative.

```
Read ${CLAUDE_PLUGIN_ROOT}/skills/claude-code-tasks/references/anti-patterns.md
```
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