Lands the lean-SDK direction (boocode_code_review_v2 §1 #9) behind a flag.
Adds @anthropic-ai/claude-agent-sdk@0.3.159 (Commercial Terms, runtime dep).
- PostgresSessionStore: clean-room impl of the SDK's real SessionStore type
over a new claude_session_entries table. Typechecks against the SDK type;
8 DB-integration tests.
- ClaudeSdkBackend (implements AgentBackend): one warm query() per (chat,claude)
in streaming-input mode via a pushable async-iterable pump, sessionStore +
resume continuity, pure mapSdkMessage->AgentEvent, session_id from init,
usage/cost onto agent_sessions (backend CHECK gains 'claude_sdk').
- Routing env-gated by CLAUDE_SDK_BACKEND (default off) -> PTY path UNCHANGED.
- Built against real SDK 0.3.159 types (install paid off: partial=stream_event
needing includePartialMessages, MessageParam, result error arm).
- Fix latent test-infra deadlock: serialize DB suites (fileParallelism:false).
Coder 269 passing default / 290 with DB; tsc clean vs SDK types; builds clean.
LIVE pump + resume + actual claude turn need a host smoke (CLAUDE_SDK_BACKEND=1
+ claude binary + auth). zod peer-dep wants ^4 (workspace 3.25). Builds on v2.7.4.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
WarmAcpBackend (AgentBackend) holds one persistent goose acp / qwen --acp child + ClientSideConnection + ACP session per (chat,agent); initialize+session/new once, reused across turns. Abort = session/cancel the prompt only (never kills the child); child exit -> agent_sessions.status='crashed' -> re-spawn next turn. Dispatcher routes goose/qwen chat-tab tasks to the pooled warm backend via pure shouldUseWarmBackend (needs session_id+chat_id); one-shot runExternalAgent kept as fallback for arena/MCP/new_task. handleSessionUpdate extracted to a shared pure acp-event-map.ts (one-shot path byte-identical). SDK: installed @agentclientprotocol/sdk@^0.22.1 has stable resumeSession/loadSession; resume moot in the warm hot path, deferred to Phase 3. 15 new tests (warm-acp-routing, acp-event-map); 180 coder tests pass; tsc + build clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The tab (a chat) is the context unit: two opencode tabs in one session are two independent agent contexts sharing one worktree. agent_sessions re-keys from (session_id, agent) to (chat_id, agent) — chat_id FK ON DELETE CASCADE (closing a tab ends its context); worktree_id and session_id become informational SET NULL columns. New worktrees table (one-per-session, survives session delete via session_id SET NULL) supersedes session_worktrees, which is defanged (CASCADE dropped) not yet removed. chat_id is threaded end-to-end: tasks.chat_id added, written by the coder message + skills routes from the frontend tab, read by runOpenCodeServerTask which falls back to resolve-or-create a chat for session-less creators (arena/MCP/new_task/generic) so ensureSession never gets a null key. Idempotent migration with a backfill-verify gate (0-row assertion after the test session was deleted). config_hash fingerprint logic preserved; one-worktree-per-session unchanged; runExternalAgent untouched. Column rename worktree_path -> path repointed at all five readers (server delete-guard, risk/stash endpoints, ensureSessionWorktree). Supersedes the earlier (worktree_id) draft.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Schema, interface, and service scaffold for v2.6 persistent agent sessions.
Nothing in this batch alters runtime behavior.
- schema.sql: add session_worktrees (one shared worktree per session, FK
sessions(id)) and agent_sessions (one backend session per (session, agent),
with backend/status CHECKs); add pending_changes.agent column for DiffPanel
attribution. All three statements idempotent (IF NOT EXISTS).
- services/agent-backend.ts: AgentBackend interface + AgentSessionHandle,
EnsureSessionOpts, PromptCtx, TurnResult, and the normalized transport-agnostic
AgentEvent union (text/reasoning/tool_call/tool_update/commands). Types only.
- services/agent-pool.ts: lazy get-or-create AgentPool keyed by
`${sessionId}:${agent}` + shared `agentPool` singleton. Empty in Phase 0.
- index.ts: widen onClose to await dispatcher.stop() then agentPool.dispose()
(pool empty, so dispose() is inert).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
