Tianyi Cui
df4b7d3d9a
Add the durable session-persistence capability seam (ADR 0016): an
abstract SessionPersistence service (dsh-session-persistence,
ctx.sessionPersistence) defining create/append/load/list/has/delete/
update over the existing SessionEvent — no parallel persisted type — and
a first implementation (dsh-session-persistence-jsonl): an append-only
JSONL log per session with crash-safe atomic writes, truncation-repair
of a never-committed crash tail, and a read/replay path. SessionMeta
(format version, cwd, lineage) travels out-of-log via session.header.
A shared runPersistenceContract suite holds every backend to the same
append-only / contiguous-seq / lazy-materialization / serializability
semantics.
Config-driven create() now uses a per-run ${id}-session-<uuid> session
id so a fixed name no longer collides with an on-disk log once a durable
backend is loaded; each run is a new session (a demo simplification). The
examples drop their hand-rolled session-jsonl.ts and load the JSONL
backend via cordis.yml; CI smoke-loads it too.
The agent-facing create/resume factory that consumes load() is a
separate seam, deferred to a follow-up; this change stops at the load
primitive and does not reach into the loop.
1.9 KiB
1.9 KiB
echo-agent
Runnable demo: stdin chat with a scripted mock model and an echo tool.
What it shows
- A complete Cordis app loaded from
cordis.yml— the standard "stack of plugins" pattern mock-llm.ts— a mockLlmAdapterthat streams scripted responses and calls theechotool when the user types "echo "echo-tool.ts— a tool registered viactx.tools.register()that echoes text back uppercased@deepseek-ai/dsh-session-persistence-jsonl— the durable JSONL persistence backend (loaded fromcordis.yml,root: ./.sessions): append-only event log per session with crash-safe atomic writes, replacing the old write-only example pluginstdio-chat.ts— a minimal UI plugin: reads stdin lines andsend/steers the agent, renders stream deltas, tool calls, and tool results
Plugin files
| File | Role | Key patterns demonstrated |
|---|---|---|
mock-llm.ts |
LlmAdapter registration |
ctx.llm.registerAdapter(['mock-echo'], …), streaming chunks with proper block-start/block-end protocol |
echo-tool.ts |
Tool registration | ctx.tools.register(defineTool(…)) with typed execute args, tool execution returning ContentBlock[] |
stdio-chat.ts |
UI | agent/stream-chunk, session/event (tool/*), stdin→send/steer |
start.ts |
Bootstrap | Context + Loader + plugin-include wired to cordis.yml |
Persistence is the shared @deepseek-ai/dsh-session-persistence-jsonl plugin (not a per-example file).
Run
yarn demo:echo
# or:
node --expose-internals --import tsx examples/echo-agent/start.ts
Type a message and press Enter. "echo " triggers a tool call round-trip (the mock model requests the echo tool, which echoes the text uppercased, and the next model step acknowledges it).
The session is persisted under examples/echo-agent/.sessions/ (per-cwd subdirectory, one .jsonl log per session). Clean up with: rm -rf examples/echo-agent/.sessions