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What you can do with Orca Replay

OrcaReplay is a TypeScript npm tool that records an AI agent run through a local proxy and lets you replay it offline, fork it onto other models, and inspect what happened.

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Continuum-AI-Corp/OrcaReplay on GitHub

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Authorization notice. This tool is dual-use. Only use it on software, sites and systems you own or have explicit permission to test, and follow the relevant licenses and terms of service.

What do you want to do?

5 use cases

  • Find the exact step that broke an agent run

    Replay a failed coding agent run offline and see which tool call changed a file or skipped a failing check.

    View prompt
    Use the OrcaReplay repo (Continuum-AI-Corp/OrcaReplay) to inspect the most recent failed run on this machine by running `orca show last` and `orca graph last`. Report the sequence number of the tool call that changed <target file> and the sequence number of any shell check that exited non-zero. Verify that `orca replay last` prints the run again with no model called.

  • Fork a run at one step and compare models

    Keep the first steps of a recorded run fixed, switch to another model from a chosen checkpoint, and compare results.

    View prompt
    Use the OrcaReplay repo (Continuum-AI-Corp/OrcaReplay) to fork the recorded run `last` at checkpoint 4 onto the models <model-a> and <model-b> using `orca compare last --from 4 --models <model-a>,<model-b>`. Report one comparison table with the outcome for each model. Verify that turns before checkpoint 4 are identical across both forks.

  • Try Orca Replay with a sample run and no key

    Run a built-in demo that replays a recorded agent fix without an agent, a key or any model call.

    View prompt
    Use the OrcaReplay repo (Continuum-AI-Corp/OrcaReplay) by running `orca quickstart` in an empty directory. Report the number of failing tests before the replay and passing tests after it. Verify that the output states no model was called and no tokens were spent.

  • Capture an agent's system prompt for each model

    Record the prompt a harness assembles for a given model, with the local machine details removed.

    View prompt
    Use the OrcaReplay repo (Continuum-AI-Corp/OrcaReplay) to capture the system prompt for the agent claude with the model <model-name> by running `node capture/capture.mjs claude --model <model-name>`. Report the file path where the sanitised prompt was saved. Verify that the saved prompt contains no local machine paths.

  • Record a Codex CLI run that cannot be redirected

    Use opt-in TLS interception to capture a Codex CLI session that talks to its own backend.

    View prompt
    Use the OrcaReplay repo (Continuum-AI-Corp/OrcaReplay) to record a Codex CLI session with TLS interception enabled, following the README section on when the harness will not be redirected. Report whether `orca show last` lists model turns from the session. Verify that hosts not on the intercept list are listed in the trace as tunnelled.

How to use Orca Replay

  1. Check you have what it needs: Node.js and npm, to install the orcareplay package; A coding agent installed locally, such as Claude Code or Codex CLI, to record a run; A model API key and network access for recording and for live forked turns.
  2. Open Continuum-AI-Corp/OrcaReplay on GitHub and read the README and license.
  3. Run npm i -g orcareplay to install the package that provides the orca command.
  4. Run orca record claude and use your agent as normal until the run finishes.
  5. Run orca show last to read the ordered timeline of model turns, tool calls, file changes and shell results.
  6. Run orca graph last to see which events produced which, and check whether each link is recorded or inferred.

These steps come from our top use case, Find the exact step that broke an agent run, which also has a copy-paste agent prompt.

Orca Replay alternatives · Best AI repos for Software and DevOps

About this repo

Requirements

  • Node.js and npm, to install the orcareplay package
  • A coding agent installed locally, such as Claude Code or Codex CLI, to record a run
  • A model API key and network access for recording and for live forked turns
  • A terminal with permission to install a global npm package
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Questions about Orca Replay

What is Orca Replay?

OrcaReplay is a TypeScript npm tool that records an AI agent run through a local proxy and lets you replay it offline, fork it onto other models, and inspect what happened. It is an open-source project on GitHub: https://github.com/Continuum-AI-Corp/OrcaReplay.

Who is Orca Replay for?

Developers and engineering teams who run coding agents and need to find out why a run went wrong or compare models on the same run.

What can I do with Orca Replay?

5 use cases so far, for example: Find the exact step that broke an agent run; Fork a run at one step and compare models; Try Orca Replay with a sample run and no key. Each has steps and a copy-paste agent prompt.

What do I need to run Orca Replay?

Node.js and npm, to install the orcareplay package; A coding agent installed locally, such as Claude Code or Codex CLI, to record a run; A model API key and network access for recording and for live forked turns; A terminal with permission to install a global npm package.

What are alternatives to Orca Replay?

Other hot AI repos in Software and DevOps: Harness2, iFixAi, Orca, Diagram Design, AI Memory.

Is Orca Replay safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.