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kandev/docs/plans/attach-workspace-sources/task-04-host-materialization.md
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---
id: "04-host-materialization"
title: "Host materialization"
status: done
wave: 3
depends_on: ["02-attachment-service"]
plan: "plan.md"
spec: "../../specs/tasks/system-design/attach-workspace-sources.md"
---
# Task 04: Host Materialization
## Acceptance
- Worktree repository additions and mixed Local/Worktree folder sources materialize under a safe
Kandev-owned task root using live, canonical, platform-native directory links.
- An idle Local execution can re-root/rebind without losing task conversation state; Worktree keeps
synchronous sibling materialization. Active work is never interrupted.
- Agentctl adopts the new workdir, refreshes file scope and Git trackers, and materialization rolls
back safely when linking, restart, rescan, or event publication fails.
## Verification
```bash
cd apps/backend
rtk go test ./internal/backendapp/... ./internal/agent/runtime/lifecycle/... ./internal/agentctl/server/api/... ./internal/agentctl/server/process/...
```
## Files likely touched
- `apps/backend/internal/backendapp/branch_materializer.go`
- `apps/backend/internal/backendapp/workspace_source_materializer.go` (new)
- `apps/backend/internal/backendapp/*workspace_source_materializer*_test.go`
- `apps/backend/internal/agent/runtime/lifecycle/manager_workspace_rescan.go`
- `apps/backend/internal/agent/runtime/lifecycle/manager_execution.go`
- `apps/backend/internal/agent/runtime/lifecycle/env_preparer_local.go`
- `apps/backend/internal/agentctl/server/api/workspace_rescan.go`
- `apps/backend/internal/agentctl/server/process/manager.go`
- platform-specific link helper/test files under `apps/backend/internal/worktree/`
## Dependencies
Task 02.
## Inputs
- Spec: host live-reference semantics and idle gate.
- ADR-2026-07-19-workspace-symlink-entries.
- Existing `branch_materializer.go` root promotion and agentctl rescan path.
## Output contract
Summary, files changed, tests run, blockers, risks, divergence, and task/plan status updates.