Tianyi Cui
066f94c7e0
Hard line breaks mid-paragraph make docs harder to edit and diff — a one-word change reflows and re-diffs the whole paragraph. Reflow all tracked non-vendor Markdown (plus vendor/AGENTS.md) so each prose paragraph is a single line; soft-wrapping is the editor's job. Fenced code, tables, and list structure are preserved (wrapped list items fold to one line per bullet). Documents the convention in AGENTS.md.
1.8 KiB
ADR 0002: Microkernel — extension via Cordis event taxonomy, one concrete loop
Status: accepted (2026-06-11)
Context
The product principle (see the 微内核Harness实现思路 design doc) is "everything is a plugin": hooks, /goal, /loop, dynamic workflows, compaction, sandboxing, permissions, UI, persistence, MCP, skills must all be writable as plugins without modifying the core. Candidate mechanisms considered: a purpose-built middleware stack (koa-compose style), an explicit phase state machine plugins can insert into, or Cordis's native event system.
Decision
Pure Cordis event taxonomy. The loop's extension seams are typed events with deliberate dispatch modes:
- waterfall (around-middleware) where plugins mutate or veto:
agent/request,agent/step-result,agent/turn-continuation,tools/execute,llm/stream,llm/generate,system-prompt/assemble. - emit (sync fire-and-forget) for notifications: turn/step boundaries, stream chunks, lifecycle, errors.
- parallel (awaited) for the one durability checkpoint:
session/flush.
The event vocabulary lives in interface packages (dsh-agent declares the agent/* events); @deepseek-ai/dsh-agent-loop is the only concrete plugin and is itself swappable — nothing outside it may depend on it.
Consequences
- Every MVP feature maps to a listener (the "plugin sanity checklist" in docs/architecture.md is the proof obligation, kept current).
- HMR and disposal come free: listeners and registrations are Cordis effects.
- Waterfall semantics (call
next()or short-circuit) are non-obvious and must be taught — documented in AGENTS.md and covered by composition tests. - The loop must be defensive: plugin exceptions are contained at turn level, steering from any seam is never stranded (regression-tested).