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Add a check for node input changes that break stored API prompts - #15739
christian-byrne wants to merge 5 commits into
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Adding a required input to an existing node makes validation reject every saved API-format prompt for that node. An optional input is safe to leave out two ways: with a default in its schema it does not have to be provided, and with no default it is a nullable value whose entry function has to carry the default for the not-connected case. The workflow snapshots every node's input surface on the PR and on the base branch and fails on new required inputs, optional inputs turning required, dropped accepted types, and removed combo options. The 12 nullable inputs that no node can currently run without are allowlisted.
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📝 WalkthroughWalkthroughThe PR adds a Python CLI that snapshots node input schemas, compares snapshots for breaking changes, and detects unsafe optional inputs. It adds an allowlist for known exceptions, unit tests for compatibility rules, and a GitHub Actions workflow for pull-request checks. Repository guidance documents required input placement, defaults, and validation rules. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In @.github/scripts/node_input_compat.py:
- Around line 117-120: Update the exception handling around node_snapshot in the
snapshot-generation flow so an unreadable registered node schema fails the
compatibility check instead of being logged and omitted; remove the broad
suppression or catch only a specifically expected exception with an explicit
safe fallback, while preserving the node name in the resulting error.
In `@AGENTS.md`:
- Around line 322-323: Update the Node Input Compatibility workflow
documentation to distinguish its two checks: unsafe optional inputs are
evaluated only in the head snapshot, while input-surface changes are compared
against the base snapshot. Keep the wording concise and factual.
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.github/scripts/node_input_compat.py.github/scripts/node_optional_input_allowlist.json.github/workflows/node-input-compat.ymlAGENTS.mdtests-unit/utils/node_input_compat_test.py
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AGENTS.mdtests-unit/utils/node_input_compat_test.py
**/*.{py,js,ts,tsx}
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tests-unit/utils/node_input_compat_test.py
**/*.py
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Files:
tests-unit/utils/node_input_compat_test.py
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Timestamp: 2026-08-20T18:43:02.512Z
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Learnt from: CR
Repo: Comfy-Org/ComfyUI
Timestamp: 2026-08-20T18:43:02.512Z
Learning: - Preserve existing APIs, node names, model-loading behavior, file layout, and
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Repo: Comfy-Org/ComfyUI
Timestamp: 2026-08-20T18:43:02.512Z
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🪛 ast-grep (0.45.1)
.github/scripts/node_input_compat.py
[warning] 181-181: File path is request-/variable-derived; validate and normalize to prevent path traversal.
Context: open(path, encoding="utf-8")
Note: [CWE-22] Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
(open-filename-from-request)
[warning] 187-187: File path is request-/variable-derived; validate and normalize to prevent path traversal.
Context: open(args.output, "w", encoding="utf-8")
Note: [CWE-22] Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
(open-filename-from-request)
🔇 Additional comments (3)
.github/scripts/node_optional_input_allowlist.json (1)
1-14: LGTM!tests-unit/utils/node_input_compat_test.py (1)
1-114: LGTM!.github/workflows/node-input-compat.yml (1)
1-38: LGTM!
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2 participants
Adding an input to an existing node breaks every API-format prompt already saved for it: validation rejects a new required input with
required_input_missing, and an optional input the entry function has no default for passes validation and then raises TypeError. This adds a PR check that snapshots every node's input surface, diffs it against the base branch, and fails on a new required input, an optional input turning required, a dropped accepted type, or a removed combo option. It also checks that optional inputs with no schema default carry one in the entry function. Type comparison is set-based so widening does not trip it, andbreaking-node-changeon a PR skips the job. Related: #11833.The 12 nullable inputs that fail the rule today are allowlisted; the allowlist is a ratchet, so a fixed entry left behind also fails.
The schema-default half of the rule depends on #15740, which fills those inputs in at execution. Until that lands, the 75 optional inputs with a schema default and no default in the entry function still raise TypeError and this check does not flag them.
Caught a deliberate break in CI (run), adding a required
trim_resulttoRegexReplace:Backtested against a three-month-old base, 11 real breaks and no false positives:
Also
pytest tests-unit/utils/node_input_compat_test.py, 14 cases over the diff and allowlist rules.