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126 lines
4.7 KiB
Markdown
126 lines
4.7 KiB
Markdown
# Session Tree Implementation Plan
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Reference: [session-tree.md](./session-tree.md)
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## Phase 1: SessionManager Core ✅
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- [x] Update entry types with `id`, `parentId` fields (using SessionEntryBase)
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- [x] Add `version` field to `SessionHeader`
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- [x] Change `CompactionEntry.firstKeptEntryIndex` → `firstKeptEntryId`
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- [x] Add `BranchSummaryEntry` type
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- [x] Add `CustomEntry` type for hooks
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- [x] Add `byId: Map<string, SessionEntry>` index
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- [x] Add `leafId: string` tracking
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- [x] Implement `getPath(fromId?)` tree traversal
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- [x] Implement `getTree()` returning `SessionTreeNode[]`
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- [x] Implement `getEntry(id)` lookup
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- [x] Implement `getLeafUuid()` and `getLeafEntry()` helpers
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- [x] Update `_buildIndex()` to populate `byId` map
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- [x] Rename `saveXXX()` to `appendXXX()` (returns id, advances leaf)
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- [x] Add `appendCustomEntry(customType, data)` for hooks
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- [x] Update `buildSessionContext()` to use `getPath()` traversal
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## Phase 2: Migration ✅
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- [x] Add `CURRENT_SESSION_VERSION = 2` constant
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- [x] Implement `migrateV1ToV2()` with extensible migration chain
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- [x] Update `setSessionFile()` to detect version and migrate
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- [x] Implement `_rewriteFile()` for post-migration persistence
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- [x] Handle `firstKeptEntryIndex` → `firstKeptEntryId` conversion in migration
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## Phase 3: Branching ✅
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- [x] Implement `branch(id)` - switch leaf pointer
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- [x] Implement `branchWithSummary(id, summary)` - create summary entry
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- [x] Implement `createBranchedSession(leafId)` - extract path to new file
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- [x] Update `AgentSession.branch()` to use new API
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## Phase 4: Compaction Integration ✅
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- [x] Update `compaction.ts` to work with IDs
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- [x] Update `prepareCompaction()` to return `firstKeptEntryId`
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- [x] Update `compact()` to return `CompactionResult` with `firstKeptEntryId`
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- [x] Update `AgentSession` compaction methods
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- [x] Add `firstKeptEntryId` to `before_compact` hook event
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## Phase 5: Testing ✅
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- [x] `migration.test.ts` - v1 to v2 migration, idempotency
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- [x] `build-context.test.ts` - context building with tree structure, compaction, branches
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- [x] `tree-traversal.test.ts` - append operations, getPath, getTree, branching
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- [x] `file-operations.test.ts` - loadEntriesFromFile, findMostRecentSession
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- [x] `save-entry.test.ts` - custom entry integration
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- [x] Update existing compaction tests for new types
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---
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## Remaining Work
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### Compaction Refactor
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- [ ] Clean up types passed to hooks (currently messy mix of `CompactionEntry`, `CompactionResult`, hook's `compaction` content)
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- [ ] Ensure consistent API between what hooks receive and what they return
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### Branch Summary Design
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Current type:
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```typescript
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export interface BranchSummaryEntry extends SessionEntryBase {
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type: "branch_summary";
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summary: string;
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}
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```
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Questions to resolve:
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- [ ] Add `abandonedLeafId` field to reference what was abandoned?
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- [ ] Store metadata about why the branch happened?
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- [ ] Who generates the summary - user, LLM, or both options?
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- [ ] Design and implement branch summarizer
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- [ ] Add tests for `branchWithSummary()` flow
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### Entry Labels
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- [ ] Add optional `label?: string` field to `SessionEntryBase`
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- [ ] Allow users to label any entry
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- [ ] Display labels in UI (tree view, path view)
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### HTML Export
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- [ ] Add collapsible sidebar showing full tree structure
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- [ ] Allow selecting any node in tree to view that path
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- [ ] Add "reset to session leaf" button
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- [ ] Render full path (no compaction resolution needed)
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- [ ] Responsive: collapse sidebar on mobile
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### UI Commands
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Design new commands based on refactored SessionManager:
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**`/branch`** - Current behavior (creates new session file from path)
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- [ ] Review if this is still the right UX with tree structure
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- [ ] Consider: should this use `createBranchedSession()` or `branch()`?
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**`/branch-here`** - In-place branching (new)
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- [ ] Use `branch(id)` to move leaf pointer without creating new file
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- [ ] Subsequent messages become new branch in same file
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- [ ] Design: how to select branch point? (similar to current `/branch` UI?)
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**`/branches`** - List/navigate branches (new)
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- [ ] Show tree structure or list of branch points
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- [ ] Allow switching between branches (move leaf pointer)
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- [ ] Show current position in tree
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**`/label`** - Label entries (new, if labels implemented)
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- [ ] Allow labeling current or selected entry
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- [ ] Display in tree view
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---
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## Notes
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- All append methods return the new entry's ID
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- Migration rewrites file on first load if version < CURRENT_VERSION
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- Existing sessions become linear chains after migration (parentId = previous entry)
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- Tree features available immediately after migration
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- SessionHeader does NOT have id/parentId (it's metadata, not part of tree)
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- Session is append-only: entries cannot be modified or deleted, only branching changes the leaf pointer
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