feat(models): add models.list() and models.schema() for Router model discovery - #202
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…discovery Python could run a Router model but not discover one: there was no way to list the catalog or read a model's input/output schema, so integrators hand-rolled GET /v2/models and .../openapi.json. This adds both, mirroring the TypeScript SDK's shapes. - list(cursor=, limit=, timeout=) returns a lazy iterable that walks the catalog by next_cursor while has_more is true; .page() returns one ModelPage (data, has_more, next_cursor, limit, request_id). limit is passed through unchanged (the server clamps above 100). - schema(model, etag=, timeout=) returns a SchemaResult; with etag it sends If-None-Match and a 304 is unchanged=True, document=None, not an error. - Same Router host, credential, retry policy and typed Router exceptions as run(); 30s default discovery timeout. Async twins on AsyncComfy. - Both routes are pinned by operationId against the vendored Router spec.
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📝 WalkthroughWalkthroughAdds synchronous and asynchronous model catalog listing and OpenAPI schema retrieval through the Router. Catalog iteration follows pagination cursors, while schema requests support conditional ETag retrieval. The change adds response types, retry and error handling, tests, and documentation. ChangesModel discovery
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Client
participant Models
participant ModelList
participant ComfyLow
participant Router
Client->>Models: Call list()
Models->>ModelList: Create lazy catalog iterator
ModelList->>ComfyLow: Request page with cursor and limit
ComfyLow->>Router: GET /v2/models
Router-->>ComfyLow: Catalog page and response headers
ComfyLow-->>ModelList: Decoded page
ModelList-->>Client: Yield CatalogModel entries
Suggested reviewers: Merge Risk: 🔵 Low · up to The discovery change is mergeable with a small documentation correction: two existing model methods describe an ETag error they cannot raise. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 33.68% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 95 functions across 8 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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🔍 Cursor Review — Consolidated panel
Triggered by @mattmillerai.
Found 9 finding(s).
| Severity | Count |
|---|---|
| 🟡 Medium | 3 |
| 🟢 Low | 5 |
| ⚪ Nit | 1 |
Panel: 6/6 reviewers contributed findings.
- reject a non-object catalog page or schema 200 as invalid_response, so a 200 carrying JSON null can no longer read as a 304 "unchanged" - require a catalog entry's id to parse as a run id and match its provider/model - clear next_cursor on the last page; keep the sent etag when a 304 omits ETag - refuse an empty or non-ASCII etag before any request - retry discovery reads' possibly-in-flight class under the client policy - make CatalogModel hashable on its id triple Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Resolve conflicts with the binary run-result change (#145): keep both the "Two result shapes" README section and the new models.list / models.schema sections, point its hand-fetch of a model's openapi.json at models.schema, and keep AsyncModels' discovery methods ahead of the module __all__.
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Review comments at @src/comfy_low/transport.py:
- Around line 1311-1313: Remove the `etag` validation clause from the
`post_model_run` and `post_model_submit` docstrings; neither method accepts
`etag` or calls `model_schema_headers`. Keep the documented `model` validation
behavior and its `parse_model_id` reference unchanged.
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CHANGELOG.mdREADME.mdsrc/comfy_low/transport.pysrc/comfy_sdk/__init__.pysrc/comfy_sdk/model_catalog.pysrc/comfy_sdk/models.pytests/conftest.pytests/test_models_discovery.pytests/test_router_spec_contract.pytests/test_sync_async_parity.py
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…submit docstrings Neither method takes etag or calls model_schema_headers; the clause was copied from get_model_schema.
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ELI-5
The Python SDK could run a Comfy Router model but couldn't tell you which models exist or what inputs a model takes. You had to write the HTTP calls yourself. This adds
client.models.list()(walk the model catalog) andclient.models.schema(model)(fetch a model's input/output OpenAPI document). Both work the same way as in the TypeScript SDK.What changed
models.list(*, cursor=None, limit=None, timeout=DISCOVERY_TIMEOUT)callsGET {router_base_url}/v2/models. It returns a lazyModelList:next_cursorwhilehas_moreis true, and yieldsCatalogModel(id, provider, model, billing)..page()returns oneModelPage(data, has_more, next_cursor, limit, request_id).limitis sent unchanged, including values above 100, because the server clamps them.AsyncModels.list()returns anAsyncModelList(async for,await ….page()).models.schema(model, *, etag=None, timeout=DISCOVERY_TIMEOUT)callsGET {router_base_url}/v2/models/{provider}/{model}/openapi.json. Each segment goes through the existingparse_model_idand is percent-encoded. It returnsSchemaResult(unchanged, document, etag, request_id).etag=, it sendsIf-None-Match, and a304returnsunchanged=True, document=Nonerather than raising.run(): Router base URL, bearer credential, retry policy (a429withRetry-Afteris ridden out), and error translation. Because a discovery read is a keyless GET that bills nothing, it also retries a5xxor read timeout (the possibly-in-flight class a run must opt into) whenever the client's policy retries at all.NO_RETRYis still one attempt. 401/403/404/5xx raise the typed Router exception read fromX-Comfy-Error-Type(Unauthorized,Forbidden,ModelNotFound,InternalError,ServiceUnavailable, …).comfy_low):get_model_catalog/get_model_schemaon both transports. The routes are confined to_MODEL_CATALOG_PATH/_MODEL_SCHEMA_PATH_TEMPLATE, andDISCOVERY_TIMEOUT = httpx.Timeout(30.0).tests/test_router_spec_contract.pypins both routes byget.operationId(listRouterModels,getRouterModelInputSchema) against the vendored spec, plus the catalog'scursor/limitparameter names. A mutation check (moving the constant to/v3/models) fails the test.tests/test_models_discovery.py(54 tests) drives the stub server. It covers:limit101/500 passed through304on anetagmatch, sync and async, and a stale tag getting the new document404→ModelNotFound, sync and async200, an entry whoseiddoesn't parse or doesn't match itsprovider/model) raisinginvalid_responsenext_cursorcleared on the last page, a304withoutETagkeeping the sent tag, and an empty or non-ASCIIetagrefused before any requestconftest.pygains the two routes.models.list/models.schemasections with runnable examples, and the hand-fetchopenapi.jsoninstruction now points atmodels.schema. There's also a CHANGELOG entry.Judgment calls
timeout=None, but it also asked for a 30 s default. In this SDKtimeout=Nonealready means "wait indefinitely" (run()), so the default isDISCOVERY_TIMEOUT(30 s) andNonekeeps its existing meaning.AsyncModels.listis notasync def: it returns the async iterable directly, soasync for m in client.models.list():works without an extraawait, matching the TypeScript shape. It is declared, with that reason, in_SYNC_ON_BOTHintests/test_sync_async_parity.py, which enforces the add-awaitcontract.has_morebut has nonext_cursor, or repeats a cursor already followed, raisesComfyError(code="invalid_response")instead of looping forever.304to a request that sent noetagis raised rather than reported as "unchanged". A caller with no tag has no cached copy that could be current.billingis carried as the decoded JSON mapping rather than a class, so new server fields reach callers without a release.id/provider/modelare validated because they addressrun():idmust parse as a run id and equal{provider}/{model}, so allowlisting onentry.providerand then runningentry.idis safe.Nonemeans only 304: the transport raisesinvalid_responsefor a200schema body that isn't a JSON object, so JSONnullcan't be read as "unchanged".CatalogModelhashes on its id triple (soset(client.models.list())works).SchemaResultstays unhashable because itsdocumentis a mutable dict.AGENTS.mdsays not to mockhttpx.ModelNotFoundon the schema route is the server's own404answer, translated. The SDK doesn't deny any capability locally. Malformed ids are refused locally withValueError, exactly asrun()refuses them.Verification against the live routes (read-only)
curlofhttps://api.comfy.org/v2/models?limit=2and…/v2/models/bfl/flux-2-pro/openapi.jsonboth return401withX-Comfy-Error-Type: unauthorizedand Router's error body. So both routes exist at the bound paths.client.models.list(limit=2).page()andclient.models.schema("bfl/flux-2-pro")both raiseUnauthorized(401,error_type="unauthorized",request_idpopulated).Merged with
mainMerged
mainat 3ceef4e to pick up #145 (binary run results). The conflicts were in the README and insrc/comfy_sdk/models.py; both sides were kept. The "Two result shapes" section stays next tomodels.run, and its manualopenapi.jsonfetch now links tomodels.schema.AsyncModels.list/schemasit before #145's module__all__. Thecredits_usedspec-contract tripwire that failed on this branch earlier passes on the merged tree.Residual
The success path against a real deployment is unverified. No valid credential was available, so these were checked only against the stub server and the live
401answers:200page ofGET /v2/models200document withETagfromGET /v2/models/{provider}/{model}/openapi.json304onIf-None-MatchThe README examples (
client.models.list(),client.models.schema("bfl/flux-2-pro")) likewise weren't run end to end. Worth one authenticated smoke run, which is read-only and unbilled.scripts/check_drift.pydoes not pin the two discovery routes. It still checks only the run route. The pytest contract test above does pin them and runs in CI'stestjob, but thecodegen-driftjob won't flag a moved discovery route for someone who only runs the drift script.getRouterModel(GET /v2/models/{provider}/{model}) is still not exposed in Python (or TypeScript). It was out of scope by design; its only extra field,input_schema_url, is covered byschema().TypeScript parity allowlist: the TypeScript SDK's
surface-parity.test.tslistsmodelsMethodsAheadOfPython: ["schema", "list"]. That entry should be removed incomfy-typescript-sdkonce this merges.Docs code samples: adding Python/TypeScript
x-codeSamplesto the Router OpenAPI spec for the docs reference pages is separate work in the upstream contract.Stale docstring: the
comfy_sdk/models.pymodule docstring still says "runis the one model operation today". That was already stale before this change (submit/subscribe/handleexist) and I didn't rewrite it here.Provenance
main):ruff check .clean,ruff format --check .clean,mypy src0 issues in 22 files,pytest1135 passed / 9 skipped / 0 failedscripts/check_drift.pyall OK;scripts/check_public_repo_hygiene.pyOKtests/test_models_discovery.pyon Python 3.10 (at af766b5): 54 passedUnauthorizedtimeoutisDISCOVERY_TIMEOUT(30 s) rather thanNone, soNonekeeps meaning "wait indefinitely". The success path wasn't exercised against a live deployment (no credential); see Residual.🤖 Generated with Claude Code
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