# G6 Host-Bridge Callback Semantics Plan

> Date: 2026-04-19
> Status: Draft
> Upstream Spec: [2026-04-19-g6-host-bridge-callback-semantics-design.md](D:/data/ideaSpace/rust/sgClaw/claw-new/docs/superpowers/specs/2026-04-19-g6-host-bridge-callback-semantics-design.md)

## Plan Intent

This plan executes one bounded next slice:

`G6 host-bridge callback semantics`

## Scope Guardrails

1. do not execute a `G6` real sample
2. do not implement host-runtime directly
3. do not open `G8`
4. do not reopen `G7`
5. do not open `G4 / G5`

## Workstreams

1. `WS1` Freeze callback semantics scope
2. `WS2` Define completion-state semantics
3. `WS3` Publish one bounded callback-semantic result

## Phase 0: Freeze the Boundary

### Objective

Lock the plan to callback semantics only.

### Tasks

1. freeze `G6` as the only target
2. freeze transport/runtime implementation and real execution as out of scope

### Acceptance Criteria

1. no broader host-runtime work begins under this plan

## Phase 1: Define Completion-State Semantics

### Objective

Turn callback completion into an explicit bounded semantic model.

### Tasks

1. define `ok`
2. define `partial`
3. define `blocked`
4. define `error`

### Acceptance Criteria

1. callback state logic is explicit and bounded

## Phase 2: Publish the Bounded Result

### Objective

Turn the callback-semantic model into one bounded next artifact.

### Tasks

1. publish the semantic result
2. if needed, publish the next bounded follow-up plan

### Acceptance Criteria

1. the next step remains narrower than direct host-runtime implementation