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Summarize a conversation's older "head" into a structured anchored Markdown
summary while preserving the most recent turns verbatim, shrinking context size
while keeping the information needed to continue coherently. Triggered by a
"Compact conversation" button in Chat Settings (not an agent tool).
Approach informed by OpenCode's session/compaction.ts:
- Ported SUMMARY_TEMPLATE (Goal / Constraints / Progress / Key Decisions /
Next Steps / Critical Context / Relevant Files) and the anchored-summary
buildPrompt (re-summarizes a prior summary when present).
- Ported the TOOL_OUTPUT_MAX_CHARS (2000) cap on tool results in the summary
request.
- Simplified tail selection to a fixed recent-turn count (DEFAULT_TAIL_TURNS=2)
instead of OpenCode's token-budget splitTurn.
core:
- New src/compaction/ module (pure, DB-free): template, prompt builder,
head/tail selection, transcript renderer with tool-output capping, prior
summary extraction. Generic over ChatMessage so callers keep turnId/seq.
- db/chunks.ts: rekeyChunks(from,to) relocates a tab's full history to a
backup tab (reversible — nothing is deleted).
- AgentEvent: compaction-started / -complete / -error variants.
api:
- AgentManager.compactTab(tempTabId, sourceTabId): side-effect-free
resolveConnection() for the compactor model (configured compaction_model_*,
else the source tab's own key+model), one-shot tool-less summary generation
via a transient Agent, then relocate full history to a fresh backup tab and
re-seed the canonical source id with [summary turn + preserved tail]. Source
tab is locked (messages queue) during the run; queue drains afterward.
- Routes: POST /tabs/:id/compact, GET/PUT /tabs/settings/compaction-model.
frontend:
- "Compact conversation" button in ModelSelector (Chat Settings), between
Working Directory and the agent toggle; idle-gated.
- Compaction-model key+model selector in Settings, beside the title model.
- Transient placeholder tab shows a large, non-faded "Please wait, compacting
conversation…" screen; closing it cancels. Source input locked while running.
- Handle compaction-* events: reload compacted source, insert backup tab,
refocus source, discard placeholder.
tests: core compaction unit tests, rekeyChunks DB test, AgentManager.compactTab
orchestration tests, and compaction route tests. All green (713 tests), biome
clean, all typechecks pass, frontend builds.
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per-chunk eviction
Replace the stored ChatMessage[] with a chunk-native model: tab.chunks (sealed
ChunkRow[]) + tab.live (transient in-flight turn buffer) + derived tab.renderGroups.
This enables per-chunk eviction (trimming WITHIN a large turn) and raw-chunk
pagination (loadOlderChunks), removing the whole-message eviction limitation.
Backend:
- Emit turn-start/turn-sealed around each turn; expose currentTurnId in the status
snapshot. turn-sealed fires after the durable write (status:idle fires before it).
- New GET /tabs/:id/chunks raw paginated endpoint (limit/before).
- Wrap appendChunks in a single SQLite transaction.
Frontend:
- turn-sealed drives a turn-aware reconcile that folds the sealed turn into chunks
while preserving a concurrent newer in-flight turn and pending queued messages;
deferred while the user is scrolled up.
- Stable turn-scoped render keys (${turnId}:${role}:${n}) avoid remount/flash.
Reconcile correctness (three review passes):
- preserve a concurrent newer turn when an earlier deferred reconcile flushes;
- keep optimistic queued user messages (no loss);
- turn-start backfill skips pending queued rows and tags only the turn initiator;
- bind consumed interrupt messages to the in-flight turn so they collapse on seal
(no lingering/duplicated bubble).
Tests: chat-store reconcile/eviction/pagination suite; api chunks endpoint + events.
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backend pagination
Frontend keeps only a bounded window of chunks in memory (configurable via
settings slider, default 100). Older messages are evicted when at the bottom
and re-fetched from the backend on scroll-up.
- Backend: paginated GET /tabs/:id/messages with ?limit=N&before=seq
- Store: evictMessages trims oldest messages until total chunks ≤ limit
- Store: loadMoreMessages fetches next page and prepends with dedup
- ChatPanel: smart scroll hooks trigger eviction on return-to-bottom
- ChatPanel: onNearTop loads older history with scroll-position maintenance
- Settings: chunk limit slider in Memory section
- Fix: oldestLoadedSeq recalculated after eviction (pagination cursor stays valid)
- Fix: seq preserved on ChatMessage for cursor tracking
- Fix: scrolledUpTabs cleaned up on tab switch (no memory leak)
- Fix: evictMessages reads appSettings.chunkLimit directly (live updates)
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- Add message queue allowing users to send messages while agent is running
- Queue messages are injected into tool results as [USER INTERRUPT]
- Retrieve tool interrupted via Promise.race when user message arrives
- Queued messages show with 'queued' badge and cancel button
- Consumed messages repositioned and chat splits at interrupt point
- New assistant message block created after interrupt for clean flow
- Add POST /chat/cancel endpoint for cancelling queued messages
- Fix CORS to allow any origin (Tailscale/LAN access)
- Fix crypto.randomUUID fallback for non-secure contexts (HTTP)
- Fix frontend API URL derivation from page hostname
- Auto-create DB tab if missing on processMessage (foreign key fix)
- Add error logging to processMessage catch block
- Fix working directory input sync on agent switch
- Fix agent mode button to re-apply agent settings
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handling
- Agent Builder: full CRUD with card grid, drag-and-drop model reorder, edit/delete
- Auto-save on edit with 600ms debounce, AbortController for concurrency, fieldset disabled until name entered
- Agent definitions stored as TOML with cwd field, loaded from global/project dirs
- Working directory: per-tab CWD override in Chat Settings, agent default CWD, auto-create on first message
- CWD validation: check-dir endpoint with ~ expansion, real-time validity indicator
- Subagent CWD validated against parent's effective CWD using path.relative
- Unavailable tool calls: caught gracefully, shown as tool call with error badge, model retries
- UI: tab bar border radius, sidebar border removed, chat input ghost style, scroll-to-bottom rectangle
- Skills dir collapse uses CSS rotation, Model Choice renamed to Chat Settings, System Prompt view removed
- Reusable SkillsBrowser/ToolPermissions with external mode for Agent Builder
- ModelSelector: Agent/Manual toggle, agent list, Agent Settings link
- Page router, skills recursive scanning, bin/up gopass removed, docker volume mounts
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- Add tabs, messages, and settings tables to SQLite database
- Backend: refactor AgentManager to manage per-tab Agent instances via Map<tabId, TabAgent>
- Backend: WebSocket events tagged with tabId for multiplexing
- Backend: tab CRUD routes (create, list, update, archive, messages)
- Backend: persist user and assistant messages to DB during chat
- Frontend: new tabStore replaces single chatStore with multi-tab reactive state
- Frontend: TabBar component using DaisyUI tabs-lift style with status dots
- Frontend: Settings sidebar panel for title generation model selection
- Frontend: wire ChatPanel, ChatInput, Header to use tabStore
- Fix HMR listener accumulation via wsClient.clearCallbacks()
- Delete old single-chat chatStore (chat.svelte.ts)
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up, scroll-to-bottom button
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- Bun monorepo with @dispatch/core, @dispatch/api, @dispatch/frontend
- Agent runtime with Vercel AI SDK, streaming via WebSocket
- Tools: read_file, write_file, list_files (scoped to working directory)
- Hono API server with POST /chat, GET /status, GET /health, WS /ws
- Svelte 5 + DaisyUI frontend with chat UI, theme switcher, copy button
- OpenCode Go (Zen) as LLM provider, deepseek-v4-flash-free model
- Docker setup (dev + prod) with bin/ scripts and gopass secrets
- Biome v2 linting/formatting, Vitest tests (44 passing)
- Debug info attached to error messages for diagnostics
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