System Prompt

# System Prompts — Plan Mode

> **The main system prompt is identical to agent mode.** Same 4 blocks, same 27,744 chars, same 4,332 words. The only difference is the per-request `cch=` hash in the billing header. Mode-specific behavior is enforced via a runtime `<system-reminder>` injected into the user message — see [user-prompt.md](user-prompt.md).
>
> See [../agent-mode/system-prompt.md](../agent-mode/system-prompt.md) for the full prompt text.

## Request Composition

Plan-mode session sent **15 requests**:

| Role | Model | Count |
|------|-------|------:|
| Warmup probe | haiku-4.5 | 1 |
| Title generator | haiku-4.5 | 1 |
| Title + branch generator | haiku-4.5 | 1 |
| Main planning loop | opus-4.7 | 12 |

**No security-monitor calls fired in plan mode** — consistent with the monitor's purpose (it gates *executions*, and plan mode is read-only by construction).

## Overhead Prompt #3 — Title + Branch Generator (haiku-4.5)

Plan mode adds a **third** haiku overhead role not seen in agent mode: title + git branch name generation. It fires mid-session (turn #12) right before `ExitPlanMode`, presumably to preset a branch name for the implementation that follows the plan.

**Words:** 232 | **Characters:** 1,316