task-coordination-strategies

Task Coordination Strategies

Strategies for decomposing complex tasks into parallelizable units, designing dependency graphs, writing effective task descriptions, and monitoring workload across agent teams.

When to Use This Skill

• Breaking down a complex task for parallel execution
• Designing task dependency relationships (blockedBy/blocks)
• Writing task descriptions with clear acceptance criteria
• Monitoring and rebalancing workload across teammates
• Identifying the critical path in a multi-task workflow

Task Decomposition Strategies

By Layer

Split work by architectural layer:

• Frontend components
• Backend API endpoints
• Database migrations/models
• Test suites

Best for: Full-stack features, vertical slices.

Caveat: "By Layer" is a form of problem-centric decomposition (planner / coder / tester roles in disguise). It works when the layers genuinely have isolable contexts; it fails when teammates end up handing context back and forth at every layer boundary. Default to By File Ownership or By Component when context can be cleanly partitioned. Use "By Layer" only when context isolation per layer is real, not aspirational. Reference: docs/references/agent-teams-best-practices.md § When to use a team.

By Component

Split work by functional component:

• Authentication module
• User profile module
• Notification module

Best for: Microservices, modular architectures

By Concern

Split work by cross-cutting concern:

• Security review
• Performance review
• Architecture review

Best for: Code reviews, audits

By File Ownership

Split work by file/directory boundaries:

• src/components/ -- Implementer 1
• src/api/ -- Implementer 2
• src/utils/ -- Implementer 3

Best for: Parallel implementation, conflict avoidance

Dependency Graph Design

Principles

1. Minimize chain depth -- Prefer wide, shallow graphs over deep chains
2. Identify the critical path -- The longest chain determines minimum completion time
3. Use blockedBy sparingly -- Only add dependencies that are truly required
4. Avoid circular dependencies -- Task A blocks B blocks A is a deadlock

Patterns

Independent (Best parallelism):

Task A --+
Task B --+--> Integration
Task C --+

Sequential (Necessary dependencies):

Task A --> Task B --> Task C

Diamond (Mixed):

        +-> Task B --+
Task A -+            +--> Task D
        +-> Task C --+

Using blockedBy/blocks

TaskCreate: { subject: "Build API endpoints" }         -> Task #1
TaskCreate: { subject: "Build frontend components" }    -> Task #2
TaskCreate: { subject: "Integration testing" }          -> Task #3
TaskUpdate: { taskId: "3", addBlockedBy: ["1", "2"] }  -> #3 waits for #1 and #2

Task Description Best Practices

Every task should include:

1. Objective -- What needs to be accomplished (1-2 sentences)
2. Owned Files -- Explicit list of files/directories this teammate may modify (load-bearing: the team-lead Prime Directive mandates this in every spawn prompt)
3. Requirements -- Specific deliverables or behaviors expected
4. Interface Contracts -- How this work connects to other teammates' work
5. Output Path (for artifact-producing tasks) -- Where the teammate must write its final report or deliverable. Required for reviewer / debugger / researcher roles; omitted only when the teammate edits code directly with no separate report.
6. Acceptance Criteria -- How to verify the task is done correctly
7. Scope Boundaries -- What is explicitly out of scope
8. Completion Protocol -- For example: "When done, call TaskUpdate(completed) BEFORE messaging the lead." Tasks left in in_progress block dependent work.

Template

## Objective
Build the user authentication API endpoints.

## Owned Files
- src/api/auth.ts
- src/api/middleware/auth-middleware.ts
- src/types/auth.ts (shared -- read only, do not modify)

## Requirements
- POST /api/login -- accepts email/password, returns JWT
- POST /api/register -- creates new user, returns JWT
- GET /api/me -- returns current user profile (requires auth)

## Interface Contract
- Import User type from src/types/auth.ts (owned by implementer-1)
- Export AuthResponse type for frontend consumption

## Acceptance Criteria
- All endpoints return proper HTTP status codes
- JWT tokens expire after 24 hours
- Passwords are hashed with bcrypt

## Out of Scope
- OAuth/social login
- Password reset flow
- Rate limiting

Workload Monitoring

Indicators of Imbalance

Signal	Meaning	Action
Teammate idle, others busy	Uneven distribution	Reassign pending tasks
Teammate stuck on one task	Possible blocker	Check in, offer help
All tasks blocked	Dependency issue	Resolve critical path first
One teammate has 3x others	Overloaded	Split tasks or reassign

Rebalancing Steps

1. Call TaskList to assess current state
2. Identify idle or overloaded teammates
3. Use TaskUpdate to reassign tasks
4. Use SendMessage to notify affected teammates
5. Monitor for improved throughput

Quality Gates via Hooks

To enforce rules at task-level boundaries without babysitting, wire the native team hooks:

• TaskCreated -- exit code 2 blocks task creation. Use to enforce that every task description includes ownership and acceptance criteria.
• TaskCompleted -- exit code 2 blocks completion. Use to gate lint / type-check / test before a task closes.
• TeammateIdle -- exit code 2 returns the teammate to work with feedback. Use when a teammate marks itself idle but the work is not actually finished.

Hooks turn "trust and hope" into "trust and verify" without inflating spawn prompts. Reference: docs/references/agent-teams-best-practices.md § Hooks for quality gates.