maximem-synap-smolagents

Synap memory integration for Smolagents — give a CodeAgent / ToolCallingAgent persistent memory through Synap.

pip install maximem-synap-smolagents smolagents

Surfaces

Smolagents keeps its own fixed step log (no pluggable memory backend), so Synap plugs into the two extension points it does expose, plus static instructions:

Example

from smolagents import CodeAgent, InferenceClientModel
from maximem_synap import MaximemSynapSDK
from synap_smolagents import create_synap_tools, synap_step_callbacks, synap_st_instructions

sdk = MaximemSynapSDK(api_key="sk-...")

agent = CodeAgent(
    model=InferenceClientModel(),
    tools=create_synap_tools(sdk, user_id="alice", customer_id="acme"),
    instructions=synap_st_instructions(
        sdk, conversation_id="conv_abc",
        instructions="You are a concise, friendly assistant.",
    ),
    step_callbacks=synap_step_callbacks(
        sdk, user_id="alice", conversation_id="conv_abc", customer_id="acme"
    ),
)
agent.run("Remind me what plan I'm on and my open ticket.")

Because CodeAgent calls tools as plain Python, search_memory / store_memory compose naturally into agent-written code.

Notes

• Synchronous framework. Smolagents runs synchronously and its tools do not support async, so every surface bridges to the async Synap SDK internally. Run the agent on its own thread if your app is otherwise async.
• Error policy. The search_memory tool degrades (returns a not-found message); store_memory raises SynapIntegrationError; the recorder logs and never raises — it runs inside the agent loop, where a raising callback would abort the run.
• Turns are conversation messages. The user's task and the assistant's final answer are written to the conversation conversation_id names: on the gRPC stream (the first turn opens it; you do not call listen()), otherwise with sdk.conversation.record_message, never both. SYNAP_AUTO_LISTEN=false (or set_auto_listen(sdk, False) from synap_integrations_common) keeps turns on REST. The server compacts that conversation and promotes it to long-term memory, and the SDK's local history search can find old turns after compaction. Reuse one conversation_id across agent.run() calls that belong together.
• No per-step documents by default. Earlier versions ingested every step's model output with memories.create, which left no conversation on the server. That is now off (ingest_steps=True turns it back on): with the turns recorded, it would extract the final answer twice.
• Live stream. On the stream the recorder also reports every tool call and its result, and the model's plan and step output as reasoning. Without a stream those are dropped.
• Synap's compaction replaces the agent's earlier steps. Smolagents builds the model's input in write_memory_to_messages and has no compaction of its own. The recorder wraps that method on the agent it is handed: once Synap has compacted the conversation, the model sees the compaction block, Synap's turns after it and the current task, instead of the earlier steps in agent.memory (which is never edited). Until then, and if Synap cannot answer, the agent's messages are untouched. The conversation is read once per run. Smolagents has no hook before a model call, so the recorder attaches after the first step; call attach_synap_history(agent, sdk, conversation_id) right after building the agent to cover the first step of a resumed conversation. compact_history=False turns it off.
• Register against MemoryStep. synap_step_callbacks does this for you. Registering the recorder against ActionStep alone (what earlier versions of this README showed) never delivers the final answer, and the assistant turn is the one event anticipation acts on.
• Two gaps, on purpose. Smolagents never passes its TaskStep to a callback, so the user turn is read from agent.task and written at the end of the first step rather than before it (report_user_task=False turns it off). And a step with several parallel tool calls merges their outputs into one observations string, so that result is reported with no tool_call_id rather than being attributed to a guessed call.

Requires Python 3.11+ and smolagents>=1.26.