Retrace

Retrace captures every model call, tool invocation, retrieval, and error as a span with its input, output, cost, and timing. Provider calls to OpenAI, Anthropic, and Gemini are auto-instrumented, so you don't have to wire up each one by hand. The result is a complete, structured record of what your agent actually did. Not a partial log. Not a guess.

This is the capability that separates Retrace from plain AI agent monitoring tools. You branch a recorded execution at a single span with a modified input, then cascade-replay every downstream step so the whole agent re-executes along the new path. It answers a question logs can't. If I change this one thing, what breaks further down?

After you change a prompt, tool, or model, prove-the-fix re-runs the failed execution and hands back a verdict. You get one of three outcomes: improved, regressed, or unchanged, plus the first divergent span. It turns "I think that fixed it" into a checkable result.

The evaluate-and-gate capability scores recorded executions against behavioral criteria and returns a pass/fail gate decision for a pipeline. Teams can run behavioral checks in CI alongside their normal tests. An agent that drifts gets caught before it reaches users. Multi-agent judge detectors are available from the Pro plan up.

Before your agent makes its next model or tool call, enforce-budget asks whether that call is allowed. It returns allow, block, or hold based on cost budgets, loop detection, and latency ceilings. That's how you stop a runaway loop or an expensive spend spike before it happens. Not after the bill arrives.

Search-spans runs a semantic search across recorded spans and agent memories to find prior occurrences of a behavior, prompt, or failure by meaning rather than exact text. If a similar bug appeared three weeks ago, you can surface it without remembering the exact phrasing.

Retrace ships an MCP-based memory store that holds persistent facts, preferences, corrections, and patterns extracted from prior agent runs. Agents can recall them by meaning, which helps keep behavior consistent across sessions instead of relearning the same corrections every time.

Publish-tape turns a scrubbed execution into an interactive, shareable tape. It's useful for bug reports, demos, and post-mortems, and PII redaction is included on every plan. The Free tier allows 10 published tapes a month.