Layers the persistence-side logic on top of the Stage 1 schema. AgentService
mirrors LlmService's CRUD shape with name-resolved llm/project references and
yaml round-trip support; ChatService is the orchestrator that drives one chat
turn end-to-end: build the merged system block (agent.systemPrompt + project
Prompts ordered by priority desc + per-call systemAppend), persist the user
turn, run the adapter, dispatch any tool_calls through an injected
ChatToolDispatcher, persist tool turns linked back via toolCallId, and loop
until the model returns terminal text.
Per-call params resolve LiteLLM-style: request body → agent.defaultParams →
adapter default. The escape hatch `extra` is forwarded as-is so each adapter
can cherry-pick provider-specific knobs (Anthropic metadata, vLLM
repetition_penalty, etc.) without code changes here.
Persistence is non-transactional across the loop because tool calls can take
minutes; long-held DB transactions would starve other writers. Instead each
in-flight assistant turn is written `pending` and flipped to `complete` only
after its tool results land. On failure or max-iter overrun, every `pending`
row in the thread is flipped to `error` so the trail is auditable.
Tools are namespaced on the wire as `<server>__<tool>`, unmarshalled at
dispatch time; `tools_allowlist` filters before the model sees the list.
Tests:
agent-service.test.ts (7) — CRUD with name-resolved llm/project, conflict
on duplicate, llm switch, project detach, listByProject filtering,
upsertByName branch coverage.
chat-service.test.ts (9) — plain text turn, full text→tool→text loop with
toolCallId linkage, max-iter cap leaves zero pending, adapter-throws
leaves zero pending, body→defaultParams merge, `extra` passthrough,
project-Prompt priority ordering in the system block, tool-without-
project rejection, tools_allowlist filtering.
All 16 green; full mcpd suite still 737/737.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
