Recurse SDK

Author, package, and deploy Recurse applications.

Installation

Python 3.14 or newer is required. Install Recurse from PyPI:

pip install recurse-sdk

This installs both the recurse command and the Python API. Check the installation:

recurse --help

Version 0.2.1 is required for account-funded runs on the current Engine. Version 0.2.0 submits a 900-second duration that the service no longer accepts. Upgrade the SDK before starting new runs. Version 0.2.3 restores the 512 MiB minimum. SDK 0.2.2 rejected requests below 768 MiB locally.

If you prefer uv, install the CLI as an isolated tool:

uv tool install recurse-sdk

Add the Python API to an application:

uv add recurse-sdk

Running or deploying an application also requires uv on your PATH to build its package.

The distribution ships two things:

• The recurse Python package: manifest validation, standards-based application packaging (recurse.build_bundle), and the runtime context tools use during a run (recurse.context).
• The recurse command: browser login, encrypted runtime-secret management, direct runs, MCP deployment, artifact retrieval, and billing.

Quickstart

An application is a directory with an agent.yaml manifest, a system prompt, a tool module, and a uv lockfile. See the runnable examples and authoring and deployment guide:

• examples/tiny-tuner — tune a classifier against held-out validation F1.
• examples/predictive-modeler — train classification, regression, and forecasting pipelines against task-specific quality constraints.
• examples/rna-fold-lab — design RNA sequences against an independent forward-fold oracle.
• examples/backpack-3d — write, render, visually critique, and revise a 3D backpack using Astra and complete Python modeling programs.
• examples/level-design — design puzzle-game levels against an independent solver: two runnable agents and one prompt-only example.

recurse login
recurse secret set github-token
recurse secret list
recurse run examples/tiny-tuner --inputs inputs.json --secret GITHUB_TOKEN=github-token
recurse deploy examples/tiny-tuner --as mcp --cpu 1 --memory-mib 1024 \
  --secret GITHUB_TOKEN=github-token
codex mcp add recurse -- recurse mcp serve <deployment-id>
claude mcp add recurse -- recurse mcp serve <deployment-id>

For Codex, apply the startup and tool timeout settings shown in the guide after adding the server.

Documentation

• docs/guide.md — installation, authoring, runtime, login, deployment, local MCP access, and billing.
• docs/reference/api.md — generated API reference.
• docs/reference/manifest.md — generated agent.yaml reference.

Contributing

Run ./check.sh for formatting, lint, types, tests, generated-reference checks, and package builds. The SDK and examples must reach 100% statement and branch coverage. The RNA and backpack examples' tests and dependencies live under their own tests directories and use separate locked environments.

Install the same gate before committing:

uv tool install pre-commit
pre-commit install

Publishing

pyproject.toml sets readme = "README.md", so package builds embed this README as the PyPI description. Editing it on GitHub does not update an existing release: PyPI retains the metadata from that release's first upload. To publish a corrected description with the next SDK release:

1. Choose an unpublished version, update project.version in pyproject.toml, and run uv lock. Update the SDK version reported in src/_recurse_cli.py and its matching CLI tests. Also run uv lock --directory examples/rna-fold-lab/tests, uv lock --directory examples/backpack-3d/tests, and uv lock --directory examples/predictive-modeler/tests to refresh their local SDK dependency.
2. Run ./check.sh to validate the release and build its wheel and source distribution in dist/.
3. Inspect the wheel's .dist-info/METADATA and the source distribution's PKG-INFO. Their description must match the current README, with pip install recurse-sdk first and uv tool install recurse-sdk as an optional alternative.
4. With PyPI publishing access, upload only the two files for that version using uv publish dist/recurse_sdk-<version>-py3-none-any.whl dist/recurse_sdk-<version>.tar.gz, replacing <version> with the selected version.
5. Check the new release's description on PyPI and the default project page. In a fresh Python 3.14 environment outside this checkout, run pip install recurse-sdk, pip check, and recurse --help. Confirm pip show recurse-sdk reports the published version.

Version 0.1.0 retains its original description. Publish a new version to refresh the default project page; PyPI does not allow replacing previously uploaded files.

License

Licensed under the Apache License 2.0.