# G6 Host-Bridge Execution Semantics Design

> Date: 2026-04-19
> Status: Draft
> Upstream Report: [2026-04-19-g6-host-bridge-prerequisites-report.md](D:/data/ideaSpace/rust/sgClaw/claw-new/docs/superpowers/reports/2026-04-19-g6-host-bridge-prerequisites-report.md)

## 1. Intent

This design defines the next bounded slice after `G6 host-bridge prerequisites` isolates the minimum blocked capability.

The target is:

`G6 host-bridge execution semantics`

## 2. Why This Slice

This slice is selected because the remaining `G6` gap is narrower than broad host-runtime implementation:

1. bridge action invocation semantics
2. callback completion semantics

## 3. Scope Boundary

This design is limited to semantic scoping only.

It may include:

1. defining the minimum bridge action semantic
2. defining the minimum callback completion semantic
3. defining how those semantics bound later `G6` real-sample entry

It must not include:

1. implementing host-runtime directly
2. executing a `G6` real sample
3. opening `G8`
4. reopening `G7`

## 4. Target Outcome

The bounded target outcome is one state:

1. one bounded `G6 host-bridge execution semantics` plan

## 5. Exit Condition

This design is complete when implementation can be bounded to one plan that:

1. freezes the semantic boundary
2. separates bridge invocation from callback completion
3. emits one bounded follow-up plan