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# Echo Agent App Composition

The echo demo swaps in a local mock LLM and teaching echo tool, then loads the stdio app package for the shared spine and terminal front door.

```mermaid
flowchart LR
  cfg["examples/echo-agent<br/>cordis.yml"]
  plugin_echo_hmr["hmr<br/>@cordisjs/plugin-hmr"]
  cfg --> plugin_echo_hmr
  plugin_echo_mock_llm["mock-llm<br/>./src/mock-llm.ts"]
  cfg --> plugin_echo_mock_llm
  plugin_echo_echo_tool["echo-tool<br/>./src/echo-tool.ts"]
  cfg --> plugin_echo_echo_tool
  plugin_echo_bash["bash<br/>@deepseek-ai/dsh-bash-local"]
  cfg --> plugin_echo_bash
  plugin_echo_stdio_agent["stdio-agent<br/>@deepseek-ai/dsh-stdio-agent"]
  cfg --> plugin_echo_stdio_agent
  plugin_echo_stdio_agent --> bundle_agent_core["@deepseek-ai/dsh-agent-core"]
  plugin_echo_stdio_agent --> bundle_jsonl["@deepseek-ai/dsh-session-persistence-jsonl"]
  plugin_echo_stdio_agent --> frontdoor_stdio["readline UI<br/>console logger<br/>pre-created main agent"]
  bundle_agent_core --> spine_llm["ctx.llm"]
  bundle_agent_core --> spine_sessions["ctx.sessions"]
  bundle_agent_core --> spine_tools["ctx.tools + tool-bash"]
  bundle_agent_core --> spine_loop["ctx.agents + ctx.agentLoop"]
```

| Plugin id | Package / module |
| --- | --- |
| `hmr` | `@cordisjs/plugin-hmr` |
| `mock-llm` | `./src/mock-llm.ts` |
| `echo-tool` | `./src/echo-tool.ts` |
| `bash` | `@deepseek-ai/dsh-bash-local` |
| `stdio-agent` | `@deepseek-ai/dsh-stdio-agent` |

Source config: [`examples/echo-agent/cordis.yml`](cordis.yml).

Maintenance mode: hybrid: the leaf plugin list is parsed from its `cordis.yml`; app package expansion is curated from package source.
