This package contains the public API and transport-independent runtime used by AstrBot SDK plugins.

The current minimum implementation includes:

• metadata.yaml v2 parsing;

• immutable message and event DTOs;

• Plugin, on.command, on.message, and lifecycle registration;

• plugin entrypoint loading;

• coroutine and async-generator handler invocation;

• protocol v1 frames and SDK DTO codecs;

• isolated stdio Runner and Host client;

• bidirectional Peer requests with connection-bound capability grants;

• cross-process yield/ack flow control;

• ctx.storage (Host-held plugin KV) and ctx.messages.send services;

• ctx.conversations (conversation.read/write) with a generic dataclass protocol codec;

• ctx.assets (assets.transfer) with chunked upload/download and automatic upload of local media sources before results cross the protocol;

• a segment codec registry with forward-compatible downgrading of unknown segment types (Face and Forward included);

• on.message handlers (message.receive) with host-side filter compilation (message types, platforms, roles, regex);

• ctx.plugins (plugin.inspect) and ctx.render (render.image) services;

• on.tool static LLM tools and ctx.tools dynamic tool registration (llm.tool.register) with annotation-derived parameter schemas;

• ctx.llm (llm.generate): provider queries, one-shot generate, and flow-controlled streaming over the capability yield/ack protocol;

• ctx.llm.embed/transcribe/synthesize (llm.embed, speech.transcribe, speech.synthesize), with ambient UMO provider selection;

• ctx.llm.run_agent (llm.agent): the built-in tool-loop agent with a plugin-scoped toolset, reserving custom agent runner fields;

• hooks.* Pipeline hooks with write-tracked in-place DTO modification and modify-capability-gated write application (12 stages including lifecycle and error notification hooks);

• command parameter schema in the Runner handshake;

• an AstrBot Core bridge (astrbot.core.star.sdk_bridge) that loads SDK plugins into the real Pipeline with command matching, typed arguments, yield/ack semantics, and Host capability dispatch.

• a legacy compatibility layer (astrbot_sdk.compat.v1): unmodified legacy plugins (Star, filter.command/regex/event_message_type, plain_result/ chain_result, Context KV/send/config) run isolated via the astrbot.api import facade and the --legacy Runner mode; isolated legacy is opt-in via runtime.isolated in metadata.yaml.

WebSocket transport is not implemented yet. Legacy Provider/hook/tool facades (astrbot.api.provider, astrbot.api.all, register, native actions, session_waiter) are not covered by the compat layer yet.