Tianyi Cui
2bae18f811
The loop logs the assistant/message (carrying tool-call blocks) BEFORE running the tools, so a crash mid-tool leaves durable tool calls with no matching tool/result. interruptedTurnClosers only added step/end + turn/end, so a resumed session's deriveMessages() replayed a dangling assistant tool-call — which every provider rejects as an invalid transcript on the next request. interruptedTurnClosers now scans the interrupted turn for tool-call blocks without a matching tool/result and synthesizes an error tool/result for each (before the step/end), so the rehydrated history is a valid transcript. Adds a dedicated repair.spec.ts and a shared-contract case proving both backends pair every orphaned call with a result. Docs (ADR 0018, both persistence READMEs, load() JSDoc) updated. Also fixes the echo-agent README session-cleanup path: demo:echo runs from the repo root, so sessions land in <repo-root>/.sessions/_no-cwd/, not examples/echo-agent/.sessions/ (review #33).
35 lines
2.1 KiB
Markdown
35 lines
2.1 KiB
Markdown
# echo-agent
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Runnable demo: stdin chat with a scripted mock model and an echo tool.
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## What it shows
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- A complete Cordis app loaded from `cordis.yml` — the standard "stack of plugins" pattern
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- `mock-llm.ts` — a mock `LlmAdapter` that streams scripted responses and calls the `echo` tool when the user types "echo <something>"
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- `echo-tool.ts` — a tool registered via `ctx.tools.register()` that echoes text back uppercased
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- `@deepseek-ai/dsh-session-persistence-jsonl` — the durable JSONL persistence backend (loaded from `cordis.yml`, `root: ./.sessions`): append-only event log per session with crash-safe atomic writes, replacing the old write-only example plugin
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- `stdio-chat.ts` — a minimal UI plugin: reads stdin lines and `send`/`steer`s the agent, renders stream deltas, tool calls, and tool results
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## Plugin files
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| File | Role | Key patterns demonstrated |
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|---|---|---|
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| `mock-llm.ts` | `LlmAdapter` registration | `ctx.llm.registerAdapter(['mock-echo'], …)`, streaming chunks with proper `block-start`/`block-end` protocol |
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| `echo-tool.ts` | Tool registration | `ctx.tools.register(defineTool(…))` with typed `execute` args, tool execution returning `ContentBlock[]` |
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| `stdio-chat.ts` | UI | `agent/stream-chunk`, `session/event` (tool/*), stdin→send/steer |
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| `start.ts` | Bootstrap | `Context` + `Loader` + `plugin-include` wired to `cordis.yml` |
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Persistence is the shared `@deepseek-ai/dsh-session-persistence-jsonl` plugin (not a per-example file).
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## Run
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```sh
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pnpm run demo:echo
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# or:
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node --expose-internals --import tsx examples/echo-agent/start.ts
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```
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Type a message and press Enter. "echo <text>" 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).
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The session is persisted under `.sessions/` relative to the directory you launch the demo from. `pnpm run demo:echo` runs from the repo root, so the logs land in `<repo-root>/.sessions/` (a session with no cwd goes in the `_no-cwd/` bucket, one `.jsonl` log per session). Clean up with: `rm -rf .sessions`
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