langsmith_tracing

LangSmith Tracing

Run a Deep Agent durably and trace its LLM calls to LangSmith, by composing LangSmithPlugin alongside DeepAgentsPlugin. The plugin carries no tracing context of its own; the observability plugin captures the model calls that DeepAgentsPlugin runs as activities. Registration order of the two plugins does not matter.

Following the shipped tracing samples, this scenario bundles the worker and starter into a single main.py and has no automated test (it requires external API keys).

What This Sample Demonstrates

• Composing DeepAgentsPlugin with temporalio.contrib.langsmith.LangSmithPlugin
• Order-independent plugin registration

Running the Sample

Prerequisites: Python >= 3.11 with the suite setup applied (interim plugin install), a running Temporal dev server (temporal server start-dev), and these environment variables:

export ANTHROPIC_API_KEY=...
export LANGSMITH_API_KEY=...   # or LANGCHAIN_API_KEY
export LANGSMITH_TRACING=true

The experimental plugin is not in the deepagents group — install it as shown in the suite README and run with --no-sync, or a bare uv run/uv sync re-syncs the environment and uninstalls it. Then run the single-process driver:

uv run --no-sync deepagents_plugin/langsmith_tracing/main.py

Traces appear in your LangSmith project.

Files

File	Description
workflow.py	TracedAgent: an ordinary Deep Agent
main.py	Composes LangSmithPlugin + DeepAgentsPlugin, runs the workflow once