Subagent Context Isolation
A workflow pattern for Claude Code where complex tasks are broken into isolated subagent calls — each with its own fresh context window — rather than accumulating everything in one long session. Parent agent coordinates; subagents execute without inheriting context rot.
Long agentic loops degrade because every tool call, error, and retry consumes context that should be reserved for reasoning. Isolating subagents gives each one a clean window — dramatically improving output quality on complex multi-step tasks and enabling true parallelism.
Senior engineers and AI leads orchestrating complex multi-step automation. Teams running parallel research, testing, or code generation pipelines where each branch is genuinely independent.
https://x.com/trq212/status/2044548257058328723
By community
How to Get It
In Claude Cowork: Open the Customize panel in the sidebar → Folder Instructions, and paste the instructions below. Claude will follow them automatically in that folder.
In Claude Code: Add these instructions to your project's CLAUDE.md file, or paste them into your conversation and ask Claude to save them.
## Subagent Context Isolation For any task that involves 3+ of the following, use a subagent with an isolated context window instead of doing it yourself in the main conversation: - Reading more than 5 files - Running more than 10 tool calls - Searching an unfamiliar codebase - Executing repetitive transformations (bulk refactor, test repair, data migration) - Multi-step research that requires reading long documents ### How to delegate 1. Write a complete, self-contained prompt for the subagent: - State the goal, constraints, and expected deliverable in the first paragraph - Paste any context it needs (relevant file snippets, decisions made in this session) - Specify the exact format of its response (e.g. "report back with bullet list of changes + git commit SHA") 2. Dispatch the subagent. 3. When it returns, summarise its result in the main conversation and ask me to confirm before moving on. ### What NOT to offload - Tasks that require remembering our prior conversation - Tasks where I'll want to mid-course correct - Tasks smaller than ~5 minutes of work (orchestration overhead > benefit) ### Parallelisation If 2+ subagent tasks are independent (don't share state, don't depend on each other's output), dispatch them concurrently. State this explicitly: "Dispatching N subagents in parallel for independent tasks." Wait for all to finish before synthesising.
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