# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project overview

Plyngent is an LLM chat and agent toolkit (Python 3.14+, PDM-managed). Early development: protocol clients, config, async memory, and a runtime client factory exist. Agent, CLI, web, tools, and router are still planned/stubbed.

## Commands

```bash
pdm install          # first-time dependency setup
pdm sync             # sync after pulling changes

pdm run basedpyright .   # type checking (basedpyright, "recommended" strictness)
pdm run ruff check .     # linting
pdm run ruff format .    # formatting
pdm run pytest           # tests (pytest-asyncio auto mode)
```

## Architecture

### Data modeling: `msgspec.Struct`

All protocol models use `msgspec.Struct` — not dataclasses, not Pydantic. Optional fields use `msgspec.field(default=UNSET)` / `default=UNSET` with type `T | Unset`.

`typedef.py`: `Unset = UnsetType` (plain assignment so msgspec recognizes it; do **not** use PEP 695 `type Unset = ...`). Multi-struct unions must be **tagged** via `tag_field` / `tag` (e.g. `role`, `type`) for decode. `JSONSchema` is `dict[str, Any]`.

### Protocol layering (`lmproto/`)

```
lmproto/openai_compatible/     ← Base: model, config, client
lmproto/deepseek/openai_compat/ ← Extends base via inheritance + extra fields
```

- **`openai_compatible/model.py`** — tagged chat messages (`SystemChatMessage`, `UserChatMessage`, …), tools, request/response, streaming chunks.
- **`openai_compatible/client.py`** — `BaseOpenAIClient` / `OpenAIClient` via `niquests` async + SSE.
- **`openai_compatible/config.py`** — `OpenAIConfig` (token + base URL).
- **DeepSeek** — `DeepseekOpenAIClient`; models add `reasoning_content`, `prefix`, `ThinkingOptions`.

### Config (`config/`)

TOML load/store (`ConfigStore`): `[providers]` tagged union presets, `[database]` section. Default path via platformdirs.

### Runtime (`runtime/`)

`create_client(provider)` maps config `Provider` → protocol client. OpenAI / openai-compatible / deepseek(openai convention) supported; anthropic and deepseek anthropic convention raise `ProviderNotSupportedError`.

### Memory (`memory/`)

Async SQLAlchemy + aiosqlite. `MemoryStore`: schema init, default local user, sessions, messages stored as msgspec chat message JSON.

### Composition utility: `Forward` descriptor

`utils/components.py` — `Forward[T]` / `forward()` for attribute forwarding on composed objects.

### Type annotations are mandatory

Basedpyright `recommended`. Ruff includes `ANN` (private return types `ANN202` ignored). Prefer PEP 695 aliases except where msgspec requires plain assignment (`Unset`).

## Commit messages

Scoped commit messages, not conventional commits:

```
<scope>: <brief description>
```

Examples: `deps: add fastapi`, `core/mq: fix incorrect message sending`, `router: add routing service for xxx`, `test/webserver: change test client`, `ci/lint: run ruff style check`.

Check `git log` for the full convention.