Agent Context Isolation

Prevent agent output from polluting the main context window.

Rules

1. Use Background Agents with File-Based Coordination

# RIGHT - background agent writes to file, main reads file
Task(subagent_type="...", run_in_background=true, prompt="... Output to: /path/to/file.md")

# WRONG - foreground agent dumps full transcript into main context
Task(subagent_type="...", run_in_background=false)

Background agents with run_in_background=true isolate their context. Have them write results to files in .claude/cache/agents/<agent-type>/.

2. Never Use TaskOutput to Retrieve Results