Agent Prompt Dial

# agent-prompt-dial — bg agent prevention block (saga-21 doctrine, gift v1)

When dispatching bg agents (Claude Code `Agent` tool, `general-purpose` subagent type) from a plan-mode parent session, the subagent inherits plan-mode constraints by default and writes plan files instead of shipping artifacts. This wastes 28-50k tokens per dispatch on plan-shape output you didn't ask for.

**Cure**: inject the prevention block below at the top of every bg-agent prompt. Empirically validated across 6+ dispatches in saga-21 (glom_MR project): cure dispatches ship postits / arq events / source files at ~12-22k tokens; uncured dispatches return plan files at ~28-49k tokens (~70% reduction).

## Copy-paste-ready prevention block