The leaf loads @deepseek-ai/dsh-cli-demo, which supplies the shared spine, JSONL persistence, one fresh main agent, and the one-shot CLI driver. Two local plugins provide the demo behavior:

mock-llm.ts registers a scripted LlmAdapter; a task beginning with echo requests the tool.
echo-tool.ts registers a typed tool that returns the input uppercased.

File	Role
`src/mock-llm.ts`	Streaming mock adapter
`src/echo-tool.ts`	Model-facing echo tool
`cordis.yml`	Mock plugins, local providers, and one `@deepseek-ai/dsh-cli-demo` entry

Run

pnpm run demo:echo "echo hello world"
pnpm run demo:echo --output-format stream-json -- "echo hello world"

The first command prints the final canned response. stream-json also exposes the canonical tool/call and tool/result events. Sessions persist under .sessions/ relative to the launch directory; remove that generated directory when finished.