---
phase: 07-integration-and-end-to-end-validation
plan: 02
subsystem: examples
tags: [lifecycle-example, task-prompt-bridge, workflow, handoff, continuation, cancel-with-result]

# Dependency graph
requires:
  - phase: 07-integration-and-end-to-end-validation
    plan: 01
    provides: Fixed task_id extraction bug, integration test safety net
  - phase: 04-task-aware-prompt-handler
    provides: TaskWorkflowPromptHandler, _meta field on GetPromptResult
  - phase: 05-partial-execution-engine
    provides: PauseReason variants, step status tracking, data dependency resolution
  - phase: 06-structured-handoff-and-client-continuation
    provides: Handoff message generation, client continuation via _task_id, cancel-with-result
provides:
  - Complete lifecycle example demonstrating task-prompt bridge (INTG-03)
  - Teaching document showing full message list from handoff
  - Data-dependency pause trigger demonstration
  - Client continuation and cancel-with-result workflow
affects: [documentation, readme]

# Tech tracking
tech-stack:
  added: []
  patterns: [synchronous main with tokio runtime block_on, stage-labeled lifecycle examples]

key-files:
  created:
    - examples/62_task_workflow_lifecycle.rs
  modified: []

key-decisions:
  - "FetchDataTool always fails to trigger handoff naturally (no runtime toggle needed)"
  - "Synchronous fn main() with tokio::runtime::Runtime::new() + block_on for example consistency"
  - "Heavy Stage N labels and section separators for teaching clarity"

patterns-established:
  - "Stage-labeled lifecycle examples: clearly numbered stages with block comments explaining what happens and why"
  - "Full message list printing: iterate all messages and display role + content for observability"

requirements-completed: [INTG-03]

# Metrics
duration: 4min
completed: 2026-02-23
---

# Phase 7 Plan 02: Task-Prompt Bridge Lifecycle Example Summary

**Complete 5-stage lifecycle example replacing opt-in demo: workflow invocation, structured handoff with full message list, client continuation via _task_id, and cancel-with-result completion**

## Performance

- **Duration:** 4 min
- **Started:** 2026-02-23T16:47:12Z
- **Completed:** 2026-02-23T16:51:01Z
- **Tasks:** 1
- **Files modified:** 2 (1 created, 1 deleted)

## Accomplishments
- Created 469-line lifecycle example demonstrating all 5 stages of the task-prompt bridge
- Printed full message list from handoff (user intent, assistant plan, tool call/result pairs, handoff narrative)
- Demonstrated data-dependency pause: fetch_data fails with ToolError, transform_data blocked on raw_data binding
- Showed client continuation via _task_id in CallTool._meta and cancel-with-result completion
- Removed old 62_task_workflow_opt_in.rs example

## Task Commits

Each task was committed atomically:

1. **Task 1: Create lifecycle example replacing opt-in example** - `40b9455` (feat)

## Files Created/Modified
- `examples/62_task_workflow_lifecycle.rs` - Complete task-prompt bridge lifecycle example with 5 stages: build server, invoke workflow, inspect handoff, client continuation, complete workflow
- `examples/62_task_workflow_opt_in.rs` - Deleted (replaced by lifecycle example)

## Decisions Made
- FetchDataTool always returns Err to trigger PauseReason::ToolError naturally, avoiding runtime configuration complexity
- Used fn main() with tokio::runtime::Runtime::new().block_on() for sync entry point, consistent with project example conventions
- Heavy inline comments with Stage N labels and block-comment separators to make the example work as a teaching document
- Printed full message list with role labels (USER/ASSISTANT) so readers see exactly what an LLM client receives

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- The task-prompt bridge is now fully validated with integration tests (07-01) and a complete lifecycle example (07-02)
- Phase 7 is complete: all INTG requirements fulfilled
- All existing tests continue to pass (191 unit, 32 context, 11 lifecycle, 6 workflow integration)

## Self-Check: PASSED

All files exist, all commits verified:
- FOUND: examples/62_task_workflow_lifecycle.rs
- MISSING (expected): examples/62_task_workflow_opt_in.rs (deleted)
- FOUND: commit 40b9455 (task 1)
- FOUND: 07-02-SUMMARY.md

---
*Phase: 07-integration-and-end-to-end-validation*
*Completed: 2026-02-23*
