Retrace
Record, replay, fork & share AI agent executions.
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Description
Record, replay, fork & share AI agent executions. See every LLM call, tool call, and error your agent makes, then debug in seconds. Free for 1,000 traces/mo.
About Retrace
What is Retrace?
Retrace is an AI agent recording and debugging platform with replay, execution forks, guardrails, and regression evaluation.
What Retrace does
Retrace records model calls, tool calls, costs, and errors on a timeline. Users replay a run or fork from a selected step, modify input, and inspect the resulting execution. Evaluations and CI gates test changes against recorded failures.
Who Retrace is for
Solo builders and teams developing Python or TypeScript agents can use Retrace for debugging and regression checks. It supports multiple agent frameworks and model providers.
How Retrace works
The user installs the SDK and adds a recording decorator in Python or wraps a function in TypeScript. Running the agent streams calls and errors to the timeline. A recorded span can be forked with changed input, replayed, and evaluated to check whether behavior improved, regressed, or remained unchanged.
Key features
- Automatic instrumentation captures prompts, responses, token usage, latency, and cost.
- Interactive timelines support playback, pause, and step-by-step inspection.
- Fork replay carries modified context into subsequent model calls.
- Guardrails monitor budgets, loops, context overflow, and latency caps.
- CI regression gates can fail a build when evaluated behavior breaks.
- Semantic search locates traces using a description of the problem.
- Agent topology and sessions show ordering across multiple agents.
- Sensitive values are redacted before storage on every plan.
Pricing
As listed on retraceai.tech, checked 14 October 2026. Prices can change; see the site for current terms.
- Free: $0 with 1,000 traces and 10 fork replays per month.
- Starter: $29 per month.
- Pro: $99 per month.
- Teams: $399 per month.
- Enterprise: contact the provider.
Facts from retraceai.tech, checked 14 October 2026
- The free plan does not require a credit card.
Written from Retrace's own website (Homepage, Pricing, Features, Docs). The maker can claim this listing to edit it.
Categories
Frequently asked questions
Which languages are supported?
Python and TypeScript SDKs support automatic capture for OpenAI, Anthropic, and Google Gemini.
Which frameworks are named?
The site lists LangChain, CrewAI, Vercel AI SDK, AutoGen, and LlamaIndex.
How does a fork work?
Users select a span, modify its input, and replay from that point forward, with a side-by-side diff of cost and latency.
Can it run in CI?
The evaluation gate returns pass or fail against a threshold, and the CLI exits with code 1 on failure.
Can replays use a user’s model account?
A Google Gemini key powers evaluation judges and server-side replay. OpenAI and Anthropic keys can be stored, with native replay described as coming.
Does it capture events during disconnection?
An offline buffer queues events and flushes them after reconnecting.