recursion-sdk (Python)
The rl-gym Python SDK, generated from the same backend OpenAPI snapshot, and
the same @SdkRoute opt-in set, as @labelbox/recursion-sdk
with openapi-python-client
— free, open source, and pinned by version. The only hand-written code is a thin
auth constructor (src/recursion/__init__.py); everything under
src/recursion_sdk/ is generated and gitignored.
The two SDKs share a surface, not just a set of operations. @SdkRoute('synthesizers', 'create')
on a backend handler produces rl.synthesizers.create(...) in both clients,
from that one declaration.
import asyncio
import os
from recursion import create_recursion_client
async def main() -> None:
rl = create_recursion_client(api_key=os.environ["LABELBOX_API_KEY"])
environment = await rl.environments.get(environment_id)
print(environment.name)
asyncio.run(main())
Surface
Namespaced exactly like the TypeScript SDK, because both are driven by the same
x-sdk-path:
// @labelbox/recursion-sdk
const job = await rl.synthesizers.create({
environmentId,
body: { name: 'Variant generator', systemPrompt: '…', runConfigVersionId },
});
# recursion-sdk
body = CreateSynthesizerJobBodyDto(name="Variant generator", system_prompt="…", ...)
job = await rl.synthesizers.create(environment_id, body=body)
Path parameters are positional, the body and query parameters are keywords. Every
call is async. Non-2xx responses raise RecursionApiError, carrying
.status_code, .parsed (the typed error body, when the operation documents
one) and .content — matching the TypeScript client's throwOnError: true.
The namespace facade (recursion_sdk/facade.py) is generated from
x-sdk-path, exactly as hey-api's nesting() callback drives the TypeScript
side, so the two clients cannot drift into different namespacing. The generated
per-endpoint modules underneath it (recursion_sdk.api.<namespace>.<method>)
remain available directly, and expose sync/asyncio variants plus
*_detailed forms that return the full response instead of raising.
Opt-in, declared at the source. An operation is in this SDK iff its backend
handler carries @SdkRoute(...)
(apps/recursion/api/src/common/sdk-route.decorator.ts), read through the same
packages/sdk-ts/src/nesting.ts the TypeScript SDK uses, so the two clients
cannot cover different operations.
Notes from real use
- ID fields deserialize to
uuid.UUID, notstr. - Required fields are enforced at model construction, so a partial body fails fast rather than at the server.
- Some operations document an error status with a description and no schema; for
those
RecursionApiError.parsedisNoneand.contentcarries the bytes.
Install
Not published to a package registry yet — no free Python index has been chosen, and the TypeScript SDK's private Artifact Registry release is npm-specific. Build and install the wheel locally:
yarn dx python-sdk:generate # pip venv, no Docker
cd packages/sdk-python
python3 -m build # or `uv build`, if you have it
pip install dist/recursion_sdk-*.whl
Requires Python 3.11+ (the generated client imports typing.Self).
Tooling: pip + hatchling, no lockfile — matching mcp_server, the repo's only
other Python package. uv is not a repo dependency, and yarn dx ci:python-sdk
deliberately uses stdlib venv + pip so the gate needs nothing beyond the
interpreter. Both work locally; uv is just faster. There is no uv.lock or
requirements.txt on purpose: this is a library, so it declares dependency
ranges and lets the consuming application own the resolution.
Regenerating
# Regenerate the client from the committed spec snapshot (packages/sdk-ts/openapi.json).
yarn dx python-sdk:generate
# Everything CI runs: regenerate, build the wheel, install it into a clean
# virtualenv, and run the test suite against that installed distribution.
yarn dx ci:python-sdk
Refreshing the snapshot itself is the TypeScript SDK's job
(yarn dx sdk:generate --refresh-spec); this package only ever reads it.
The generator-private projection
The committed snapshot is a mixed OAS 3.0/3.1 document: Nest + nestjs-zod
emit 3.0 (nullable: true, boolean exclusiveMinimum) while the merged Managed
Agents Go schemas are already JSON Schema 2020-12 (type: "null",
prefixItems). Relabelling one as 3.1 would silently discard the 3.0 halves'
meaning, since nullable is not a 3.1 keyword.
So yarn dx python-sdk:generate writes a generator-private projection
(openapi.generated.json, gitignored) that converts rather than relabels, and
feeds the generator that. It never touches the snapshot, the TypeScript SDK, or
the backend. Each transform, and why it preserves semantics, is documented in
tools/dx/src/commands/python-sdk.ts and pinned by
tools/dx/src/commands/python-sdk.test.ts.
The projection is not cosmetic — it is measurably what makes generation complete. From the unprojected spec the generator emits 342/343 operations with parse failures on the recursive-union endpoints; from the projection, 343/343 with one allowlisted warning.
Generation then fails on any generator diagnostic that is not explicitly
allowlisted, and on any opted-in operation missing from either the generated
tree or the facade. The generator exits 0 while printing "Client was generated,
but some pieces may be missing", so neither is implied by a successful run. The
one allowlisted warning is an application/x-yaml alternative request encoding
on a single Managed Agents operation; the application/json variant every other
operation uses is generated normally. The allowlist is keyed by operation and
signature, so the same warning elsewhere still fails.
Not a Yarn workspace
packages/AGENTS.md requires every new package under packages/ to be
registered in the root workspaces array, tools/dx/src/context.ts,
tools/dx/src/commands/workspace.ts, and the backend Dockerfile. None of that
applies here: those steps exist so Node consumers can require.resolve() the
package's dist/ and so yarn install --immutable sees every manifest. This
package has no package.json, is not in the Node dependency graph, and is never
installed into the backend image. Registration is keyed on package.json
discovery (tools/dx/src/workspace-registration.test.ts), so there is nothing to
register.
1 maintainer
Release files for labelbox-recursion-sdk 0.0.38
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
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| labelbox_recursion_sdk-0.0.38.tar.gz | 982.8 kB | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| labelbox_recursion_sdk-0.0.38-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 3.7 MB
Release files / labelbox_recursion_sdk-0.0.38.tar.gz
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