feat(wheel)!: a Python processor's config is one class named by its __init__ annotation - #2226
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…_init__ annotation Python config was keyword arguments on `__init__` with nothing recorded anywhere, so an agent guessed a key and learned a wrong one only after the node was already in the graph. A processor's config is now one class, mirroring the Rust config struct, and its JSON Schema is derived at decoration from the class the author already wrote. The document is draft 2020-12 with no `$schema` key — the dialect the Rust seam emits — derived with no dependency: a TypedDict from its annotations and required keys, a dataclass from its init=True fields, and a model from the `model_json_schema()` it carries, duck-typed so the wheel never imports pydantic. BREAKING CHANGE: keyword-argument configuration is deleted. A processor's `__init__` takes one `config` parameter annotated with its config class, or nothing beyond `self`; any other signature is refused at decoration. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…fig class The canary for the config-class change: `packages/` is the only consumer tree with a CI lane, so migrating it here is what proves the new construction path on real processors rather than on fixtures alone. Each of the four gains a dataclass config whose fields carry `Annotated` descriptions, so `/api/registry` publishes what a relay URL or a bearer token is for. The config classes are exported beside their processors. The tests construct through the config class rather than through a kwargs forwarder, which keeps pyright checking every call site. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
… as no class Three gaps a recon sweep over the change's seams turned up. `typing.is_typeddict` recognises `typing.TypedDict` alone, so a `typing_extensions.TypedDict` config — the spelling the 3.10 floor needs for `Required`/`NotRequired` — fell through to an open object with no keys and no refusal to say so. `isinstance(typing.Any, type)` is False on 3.10 and True on 3.11+, so `config: Any` was refused on one half of the wheel's own range and accepted on the other; it is named either way now. And the superseded keyword-configuration bullet in the ADR is marked as such. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
pyright flagged the deliberately-unresolvable annotation and a redeclared subject class in the schema helper.
The ticket's headline claim had no CI-visible proof: every live test of a configured Python processor is `requires_gpu`, so the whole path from a config class to `/api/registry` ran on the rig alone. Four processors — a TypedDict, a dataclass, a model and one declaring no config — added to a real node, each in its own helper process, and the node's own `/api/registry` read back off itself. The same run proves the helper constructed the object, which a served document cannot show. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…ing consumers The owner ruled the four extension-wheel processors migrate in the same PR as the engine half: packages/ is the only consumer tree with a CI lane, so migrating it proves the construction path on real processors rather than on fixtures alone. The examples lag as before.
…ng the stack Inlining is the only nesting the deriver emits, so a class that reaches itself had no fixed point: the walk recursed until the stack ran out, at decoration, which is import time — and the traceback named typing internals rather than the class. The walk now carries its ancestry and stops at a cycle with an open object. An ancestry, not a visited set, so a diamond is still inlined twice. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The memo was uncommitted in the working tree when this branch started and does not belong to this ticket. It stays on disk, untracked, for whoever owns it.
An `Optional` field defaulting to None is the commonest config shape there is, and the document crosses into Rust through the same msgpack value tree the data plane uses — where a nil is the one value that could arrive as an absent key.
Findings from an adversarial review pass, each reproduced before the fix. A `Required[T]` / `NotRequired[T]` key published an empty schema: the qualifier says nothing about the value, and unrecognised it swallowed the type the catalog exists to publish. Requiredness itself was always right. A dataclass `InitVar` was absent from `properties` while `additionalProperties: false` forbade it — a catalog telling an agent that a required key is illegal. `dataclasses.fields()` omits the pseudo-field, so the walk reads the resolved annotations instead. A model nested under a property kept the root-relative `#/$defs/` pointers it wrote as a root, which resolve against nothing once it is no longer the root. Its pointers are followed and its `$defs` dropped; a model handed in as the config class itself is still taken verbatim, because there its pointers resolve. A non-finite float or an integer wider than 64 bits reached the msgpack hop, which turns the first into a null the author never wrote and refuses the second outright — losing the whole declaration over one default. Both are dropped. Beside those: the no-config parity test compares against the document Rust actually publishes rather than a literal, the extension wheels' engine floor stops naming a release that predates config-class hosting, and `Runtime.add`'s stub docstring covers a native built-in's config too. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Three findings from a Rust craftsmanship pass. The reader wrapped the bag converter's error, so a hand-built class holding a set was told about GPU frames and what a bag is built from. A non-mapping is refused here instead, naming the hand-built case the way the sibling execution-mode reader already does. The test's stand-in `streamlib` package hand-built a module object and ran the sibling's source into it. Giving the package the real source directory as its search path lets the interpreter do it — `__init__.py` is never run, because a package already on `sys.modules` is not initialised again — and the helper loses thirty lines and stops shadowing every other submodule. Beside those: the parity test's rustdoc loses two paragraphs of justification that belong in a PR, and its fully-qualified trait call uses the import the test module already has. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…an run The module claimed to need no GPU and did: its app calls `run()`, which initializes a GPU context, so on CI's driverless runner all six errored. Proven by hiding the Vulkan ICD, which is that runner's state. The control plane is itself a processor, so there is no serving a catalog without a running graph — this is rig-only like every other live proof in the suite, and the docstring says so now. What CI loses, a wheel-crate Rust test replaces: a Python class's descriptor rendered through `ProcessorDescriptorOutput`, the exact type `/api/registry` serializes. With the endpoint's own test that is the whole path, minus the running node. Beside those: the change file's consumer bullet records the canary ruling the ADR already carried, and the one config-class kind the deriver cannot describe is pinned rather than left to drift. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
… two records read true The replacement CI-visible test had no nullable field, so the one assertion the GPU-marked file actually owed the Rust hop — a nil crossing the msgpack value tree — was covered nowhere. The extension floors' rationale now says what the edit delivers: 0.20.0 is the highest floor the release wiring permits, not the floor that is true, and an install against exactly 0.20.0 resolves and then fails in the helper child. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughPython processors now declare configuration classes through ChangesPython configuration contract
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Merge Risk: 🟡 Moderate · up to Configuration packages can install against an incompatible engine version, and invalid configuration classes may not fail until processors are constructed. These compatibility and runtime failures should be resolved before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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| if config_class is None: | ||
| _refuse_a_configuration_with_nowhere_to_go(processor_class, configuration) | ||
| return processor_class() | ||
| return processor_class(config=config_class(**configuration)) |
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Not a defect — flow-insensitive analysis. config= is only reached at line 37, which runs when config_class is not None. Unconfigured declares no config, so getattr(cls, "__streamlib_processor_config_class__") is None for it and it takes the processor_class() branch on line 36 instead. The two branches are mutually exclusive and each is covered: test_a_dataclass_config_reaches_the_processor_as_an_object for this line, test_a_processor_declaring_no_config_takes_an_empty_one for the other.
| configuration = _as_configuration_mapping(processor_class, configuration) | ||
| if config_class is None: | ||
| _refuse_a_configuration_with_nowhere_to_go(processor_class, configuration) | ||
| return processor_class() |
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Not a defect, and the mirror image of the comment on line 37. Line 36 is the no-config branch, reached only when the class declared no config class at decoration — WhipPublisher, DataclassConfigured, TypedDictConfigured and ModelConfigured all declare one, so none of them reaches it. The classes that do reach it take no arguments by construction, which is what the decorator checked.
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In `@packages/streamlib-moq/pyproject.toml`:
- Line 53: Update the dependencies declarations in
packages/streamlib-moq/pyproject.toml at lines 53-53 and
packages/streamlib-webrtc/pyproject.toml at lines 52-52 so neither wheel allows
streamlib 0.20.0; raise each lower bound to the first released engine version
that hosts the required configuration classes, or defer publishing until that
version is available.
In `@sdk/streamlib-python-wheel/python/streamlib/_processor_config_schema.py`:
- Around line 384-388: Update _sequence_schema so fixed positional tuples that
emit prefixItems also set minItems and maxItems to the positional element count,
ensuring tuple length cannot be shorter or longer while preserving the existing
prefixItems schemas.
- Around line 237-242: Update _dataclass_document to derive documented
configuration fields from inspect.signature(config_class), not only field.init,
so the published schema matches arguments accepted by
config_class(**configuration). Ensure dataclass(init=False) and user-defined
constructors cannot expose rejected fields; alternatively reject such
incompatible classes during decoration.
In `@sdk/streamlib-python-wheel/python/streamlib/_processor_declaration.py`:
- Around line 494-502: Update the config annotation validation in the
declaration helper to accept only TypedDicts, dataclasses, or supported model
classes that provide the required schema capability, while continuing to reject
parameterized and non-class annotations. Ensure unsupported classes such as int
and ordinary classes without model_json_schema() raise TypeError during
decoration rather than reaching _document_for_class or processor construction.
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docs/decisions/agent-readable-processor-catalog.mddocs/decisions/importable-python-library.mddocs/plan/changes/agent-readable-processor-catalog.mdpackages/streamlib-moq/pyproject.tomlpackages/streamlib-moq/python/streamlib_moq/__init__.pypackages/streamlib-moq/python/streamlib_moq/processors.pypackages/streamlib-moq/tests/test_data_track_round_trip.pypackages/streamlib-moq/tests/test_processors.pypackages/streamlib-moq/tests/test_wire_contract.pypackages/streamlib-webrtc/pyproject.tomlpackages/streamlib-webrtc/python/streamlib_webrtc/__init__.pypackages/streamlib-webrtc/python/streamlib_webrtc/processors.pypackages/streamlib-webrtc/tests/test_processors.pyruntime/streamlib-api-server/src/mcp.rsruntime/streamlib-engine/src/core/json_schema.rssdk/streamlib-python-wheel/python/streamlib/_engine.pyisdk/streamlib-python-wheel/python/streamlib/_processor_config_schema.pysdk/streamlib-python-wheel/python/streamlib/_processor_declaration.pysdk/streamlib-python-wheel/python/streamlib/_processor_hosting.pysdk/streamlib-python-wheel/src/python_bag_conversion.rssdk/streamlib-python-wheel/src/python_processor_declaration.rssdk/streamlib-python-wheel/src/python_runtime_lifecycle.rssdk/streamlib-python-wheel/tests/capability_context_probes.pysdk/streamlib-python-wheel/tests/helper_placement_processors.pysdk/streamlib-python-wheel/tests/helper_process_probes.pysdk/streamlib-python-wheel/tests/processor_config_catalog_app.pysdk/streamlib-python-wheel/tests/processor_config_catalog_probes.pysdk/streamlib-python-wheel/tests/single_processor_under_test.pysdk/streamlib-python-wheel/tests/test_capability_contexts.pysdk/streamlib-python-wheel/tests/test_live_graph_mutation.pysdk/streamlib-python-wheel/tests/test_processor_config_catalog.pysdk/streamlib-python-wheel/tests/test_processor_config_class.pysdk/streamlib-python-wheel/tests/texture_ring_producer_probes.py
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…structor takes Two review findings, both reproduced first. A fixed-length tuple published `prefixItems` alone. 2020-12 reads that as what each position holds and nothing about how many there are, so the document validated a shorter or longer array; the Rust seam already bounds its tuples, so this was a parity gap too. A dataclass whose constructor is narrower than its field list — `init=False`, or a hand-written `__init__` — published fields `config_class(**configuration)` refuses. The constructor has the final say now. A generated `__init__` takes exactly the `init=True` fields, so nothing narrows for an ordinary dataclass. Beside those: an unused config-class import in the webrtc tests. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Merged
This was referenced Sep 13, 2026
fix(examples): audio-mixer-demo's processors take a config class instead of keyword parameters
#2236
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…rchive it (#2243) Folds the three [agent-readable-processor-catalog] entries in §Processor model as built (#2224, #2226, #2228) and adds the MCP resources and prompts sentence §Control plane owed #2215 (#2232). Both section headings drop the change arrow and stay IN-FLIGHT for their remaining OPEN entries. The change file moves to archive/ under the last ticket's merge date. Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
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Summary
A Python processor's config was keyword arguments on
__init__with nothing recordedanywhere, so an agent guessed a key and learned a wrong one only after the node was
already in the graph. Config is now one class, named by the annotation on
__init__'sconfigparameter, and its JSON Schema is derived at decoration from the class the authoralready wrote.
@processorreads the init type hints. Aconfigparameter names the config class; an__init__with nothing beyondself, or none at all, declares no config; every othersignature is refused at decoration with a message naming the class, the parameter and the
fix. The document is draft 2020-12 with no
$schemakey, the dialect the Rust seam emits,derived with no dependency: a TypedDict from its annotations and required keys, a
dataclass from its constructor inputs, and a model from the
model_json_schema()itcarries, duck-typed so the wheel never imports pydantic. The Rust half reads the stamped
document into
ProcessorDescriptor.config_schema, which/api/registryserves.The wire is unchanged.
rt.add(cls, config={...})still carries a dict, the graph nodestill stores JSON, and
ctx.configis still the mapping.Keyword construction is deleted, no shims. Construction is the only check the wheel
performs, and how strict it is stays the author's choice of config class — the same dial
read(port, into=T)already is.Breaking, pre-1.0. Two commits carry the conventional
!.Closes
Closes #2222
Exit criteria
def __init__(self, config: BlurConfig)shows aconfig_schemain
/api/registrywith types, defaults, descriptions andrequired, for a TypedDict, adataclass and a pydantic model alike.
__init__is refused at decoration with a message naming the fix; aclass with no config refuses a non-empty configuration.
configurereceives one.form, and CI is green.
Test plan
Run with the Vulkan driver hidden (
VK_ICD_FILENAMESandVK_DRIVER_FILESpointed atnothing), which is the state of the GPU-free runner rather than of this machine.
streamlib-moq: pytest / pyright / stubteststreamlib-webrtc: pytest / pyright / stubtestcargo fmt --all --check, clippy, cargo-deny, licence headerscargo xtask check-all-source-gatesNew coverage: 53 declaration, derivation and hosting tests in
tests/test_processor_config_class.py; 6 end-to-end tests intests/test_processor_config_catalog.py, rig-only; and three wheel-crate Rust tests forthe descriptor, the served rendering and cross-language parity of the no-config document.
Notes for owner
One question, not settled here. A plain annotated class is accepted as a config class,
constructs correctly, and publishes
{"type": "object"}— no keys, no defaults, norefusal. The plan says "any class constructible from the config's keys with annotated
fields" while the approved change enumerates three kinds, so this is a plan silence rather
than a contradiction. Today's behaviour is pinned by a test so it cannot drift. The fork is
whether such a class should instead be refused at decoration, naming the three describable
kinds, or read off its
__init__. Narrowing later is a pre-1.0 rename with no shim debt.The extension wheels' engine floor is the highest legal value, not the true one. These
processors need an engine whose helper constructs a config class, which ships in the
release after this one. The existing ceiling rule in both
pyproject.tomlfiles forbidsnaming a same-run release, because the release lane installs from the published index. So
the floor moved from 0.18.x to 0.20.0 and an install against exactly 0.20.0 still resolves
and then fails in the helper child. Both files now say so, and the floor wants a one-line
bump once the carrying release exists. I verified that a floor naming the unreleased
version is unsatisfiable against the wheel the extension lane itself builds.
A
titlekey differs by language and is deliberate.schemarsstamps every Rustconfig document with a root
titlefrom the type's name; no Python document carries one.Both are valid 2020-12 and nothing validates on it. The parity test compares against the
document Rust actually publishes with that key excluded, and the reason is written down.
Live
configurehas no node-level proof. Nothing in the repo definedconfigurebeforethis change, so reconfiguration is covered at the hosting seam rather than through a running
graph.
The extension wheels were migrated in-stream by your ruling this session, as the
deliberate canary §Consumers reserves, because
packages/is the only consumer tree with aCI lane. That is recorded in the ADR, in the change file's consumer bullet, and as a comment
on #2222 naming the fourteen example processors that still owe backlog at ship.
Findings outside scope, not filed. A
@dataclass(init=False)carrying a hand-writtenzero-argument
__init__still publishes its fields withadditionalProperties: false, sothe catalog advertises keys that class refuses — exotic enough not to chase. And the
hand-built-marker fixture preamble in the wheel's Rust tests is triplicated, so one new
decorator attribute cost three edits here; hoisting it is pre-existing cleanup.
An unrelated research memo about Zenoh was uncommitted in the working tree when this
branch started and was twice swept in by a broad stage. It is out of the branch, intact on
disk, and added to
.git/info/excludelocally so it stops being picked up.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Documentation
Tests