Patterns for designing multi-agent systems with Claude Code - job description method, shared folder communication, handbook consolidation, context management. Use when building complex agent orchestrations.
Patterns for designing multi-agent systems with Claude Code - job description method, shared folder communication, handbook consolidation, context management. Use when building complex agent orchestrations.
Multi-Agent Architecture
Design principles for orchestrating many sub-agents without context overflow.
Core Philosophy
Treat agent design like human hiring: write a job description first, then translate to architecture. The framing shapes every decision.
The Job Description Method
Before writing any agent code:
Write a human JD — What would you want this person to do? What qualities? What indicates success?
Identify handoff points — Where would a human need to check in or escalate?
Define the onboarding — What handbook would you give a new hire?
Translate to agents — Each JD section becomes architecture
1. Orchestrator spawns sub-agents
2. Each sub-agent:
- Does work
- Writes report to .claude/workspace/{phase}/{name}.md
- Returns only: { status: "complete", path: "..." }
3. Downstream agents read prior phase outputs directly
4. Orchestrator reads manifest, not full reports
Benefits:
Orchestrator context stays minimal
Sub-agents get full upstream context
No signal loss from summarization relay
The Handbook Pattern
Problem: Many narrow skills create fragility and maintenance burden.
Solution: One handbook organized by chapters, read foundation + relevant sections.
skills/project-manager/
├── SKILL.md # Entry point, routes to chapters
└── references/
├── 01-foundation.md # Who we are, tools, escalation, standards
├── 02-daily-ops.md # Data gathering procedures
├── 03-dashboards.md # Structure, quality checks
└── 04-onboarding.md # New client setup
Chapter Structure:
Chapter
Contents
Foundation
Team, tools, data sources, escalation rules, quality standards
Domain chapters
Specific procedures for each responsibility area
Reading Pattern:
Sub-agent reads:
1. Foundation chapter (always)
2. Relevant domain chapter(s) (based on task)
Context Budget Strategies
Strategy
When to Use
Shared folder
5+ sub-agents, inter-agent dependencies
Context proxy
Research agents returning verbose results
Manifest files
Orchestrator needs status, not details
Chunked execution
Serial phases when parallel overwhelms
Architecture Decision Tree
How many sub-agents?
├── 1-3 → Direct orchestration (return reports to main)
├── 4-10 → Shared folder pattern
└── 10+ → Phased execution with manifest
Do teammates need direct communication?
├── No → Sub-agents (Task tool) — report results back only
└── Yes → Agent Teams — shared task list, inter-agent messaging
├── See agent-teams skill for full guide
└── Best for: parallel review, competing hypotheses, multi-module features
Do sub-agents need each other's output?
├── No → Parallel execution, merge results
└── Yes → Shared folder, dependency ordering
Is orchestrator context a concern?
├── No → Return full reports
└── Yes → Status-only returns + file paths
Shared-State Mutation Safety
When multiple agents can transition the same work item (issue, task, label) through states, silent race conditions cause duplicate work or skipped transitions.
Three-step guard (apply before every state write):
1. READ — Re-fetch current state immediately before mutation (never use cached state)
2. VERIFY — Confirm state matches expected pre-condition
3. WRITE — Apply transition in a single atomic operation
Implementation pattern:
CURRENT_STATE = fetch_state(item_id) # live read, not cached
If CURRENT_STATE != EXPECTED_PRE_STATE:
ABORT — log stale-race, do not mutate
Else:
apply_transition(item_id, NEW_STATE) # single atomic call
For GitHub labels specifically:
CURRENT_LABELS = gh issue view {id} --json labels
If EXPECTED_LABEL not in CURRENT_LABELS:
ABORT — another agent already transitioned this item
Else:
gh issue edit {id} --remove-label {old} --add-label {new} # one call
Decision table:
Scenario
Action
State matches expectation
Apply transition atomically
State already at target
Skip silently (idempotent)
State at unexpected value
Abort, log conflict, do not retry
Item not found
Abort, log missing item
Why single atomic call matters: Two separate --remove-label and --add-label calls create a window where another agent reads the item in an intermediate state. Combine into one gh issue edit invocation.
When workers need to communicate directly with each other — not just report back to an orchestrator — use Agent Teams instead of sub-agents. Agent Teams provide shared task lists, inter-agent messaging, and independent context windows.
Key differences from sub-agent patterns above:
Teammates message each other directly (not just back to caller)
Shared task list with self-claiming and dependency auto-unblock
Each teammate is a full Claude Code session with own context
When to upgrade from sub-agents to Agent Teams:
Sub-agents need to share findings mid-task
You need adversarial debate or competing hypotheses
3+ workers need self-organizing coordination
For full setup, operations reference, and orchestration patterns, apply the agent-teams skill.