Instrument synchronous and asynchronous AI applications with provider-neutral events. Export portable
.rfr files or submit snapshots to the Refract REST service. Record model calls, tools, retrieval,
decisions, state changes, checkpoints and failures — then inspect, replay, fork and diff them.
Install
pip install llm-refract
MCP support is an optional extra:
pip install "llm-refract[mcp]"
SDK usage
import refract
with refract.run("agent", path="run.rfr"):
refract.event(type="generation", name="answer", output={"text": "Hello"})
Try python examples/python/basic/record.py after installing. Outputs go to .examples/.
See the Python usage guide for async patterns, redaction, failure capture and submitting to a remote endpoint.
MCP server
Executable stdio interface to the Rust Refract API: fourteen read-only tools, plus import/fork tools when
REFRACT_MCP_ALLOW_WRITES=1. Requires the mcp extra above. Start with:
refract-mcp
See configuration, tool inventory and limits.
Implementation: server.py.
Links
License
Apache-2.0 — see LICENSE.
See provider coverage for Azure, Gemini/Vertex, Bedrock and custom model adapters, and production operation for reliable remote capture.
Use refract.instrument_litellm() with llm-refract[litellm] to observe LiteLLM module or Router calls.
Provider documentation covers configuration, mock examples and nested-call deduplication.
1 maintainer
Metadata
1 maintainer
Release files for llm-refract 0.1.4
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