# TASK-087-04-01: Core Session Persistence, Retry, and Cancel Semantics

**Parent:** [TASK-087-04](./TASK-087-04_Session_Persistence_Retry_and_Cancel_Semantics.md)  
**Status:** ✅ Done  
**Priority:** 🟡 Medium  
**Depends On:** [TASK-085-01](./TASK-085-01_Session_State_Model_and_Capability_Phases.md), [TASK-087-02](./TASK-087-02_Router_Parameter_Resolution_Integration.md)

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## Objective

Implement the core code changes for **Session Persistence, Retry, and Cancel Semantics**.

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## Repository Touchpoints

- `server/adapters/mcp/session_state.py`
- `server/adapters/mcp/context_utils.py`
- `server/adapters/mcp/areas/router.py`
- `server/application/tool_handlers/router_handler.py`
- `tests/unit/router/application/test_router_handler_parameters.py`
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## Planned Work

- session state fields:
  - `pending_elicitation_id`
  - `pending_workflow_name`
  - `partial_answers`
  - `pending_question_set_id`
- helper logic for retry and cleanup
- align persisted elicitation keys with the canonical session-state model from TASK-085-01
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## Acceptance Criteria

- users can cancel or pause elicitation safely
- partial answers survive across the next interaction step when appropriate
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## Atomic Work Items

1. Persist pending question-set identity and partial answers.
2. Implement retry, cancel, and cleanup transitions explicitly.
3. Add tests for cancel-and-resume and partial-answer retry flows.
