ComfyUI — practical diagnosis: A ComfyUI graph reports missing custom node inputs after an extension update. The objective is to establish which supported component or configuration is responsible, then make one reversible change at a time. Check current vendor release notes and apply these instructions only to the product and version you actually use.
Before replacing or upgrading anything
An agent can fail at tool discovery, transport, credentials, schema validation, model selection or side-effect execution. Fixing one layer does not establish that all agent actions are trustworthy. For this case, the useful starting evidence is: Save the workflow JSON and record the installed custom-node versions before changing anything. This establishes the version, device, service or policy involved before a repair suggestion is applied.
Scope: AI platform interfaces and MCP capabilities change quickly. Refer to current protocol and provider documentation; no hypothetical 2027 error label should be represented as an observed vendor code. Save the message exactly as shown, along with the date, version, operating-system edition and relevant device or account role. A support calendar is not a diagnostic error; it changes how urgently supported maintenance should be planned.
Interpret the evidence
Compare the node's release notes and restore a compatible approved node version in a test environment. A comparable working system or unaffected account can narrow the problem, but it needs to use the same documented product variant. Avoid treating a successful connection, login or download as proof if the original failure happened later in the workflow.
| Evidence to check | What it distinguishes | Next supported move |
|---|---|---|
| Recorded initial symptom | A ComfyUI graph reports missing custom node inputs after an extension update. | Save the workflow JSON and record the installed custom-node versions before changing anything. |
| Independent comparison | Whether the issue follows the client, account, release or shared infrastructure | Compare the node's release notes and restore a compatible approved node version in a test environment. |
| Advanced evidence | The specific dependency rather than an assumed generic error | Check Python package and model compatibility without blindly reinstalling the entire application. |
Step-by-Step Troubleshooting
Select Beginner for reversible checks; Advanced investigates dependencies and documents evidence.
Record the actual ComfyUI state
A ComfyUI graph reports missing custom node inputs after an extension update. Capture the precise warning or status and the applicable edition, model, runtime or tenant without any passwords or account identifiers.
Run the initial supported check
Save the workflow JSON and record the installed custom-node versions before changing anything. Record what was observed, not what was expected. If an official support deadline or outage explains it, pause further local changes.
Compare against a working baseline
Compare the node's release notes and restore a compatible approved node version in a test environment. Use the same app, device generation or account scope where possible. Prefer a reversible test that leaves documents, credentials and saves intact.
Confirm the original action safely
Repeat the original harmless action once and compare with A ComfyUI graph reports missing custom node inputs after an extension update.. Do not execute unknown scripts supplied by third-party workflow files.
Inspect the ComfyUI dependency
Check Python package and model compatibility without blindly reinstalling the entire application. Record the smallest useful version, capability or log extract for a supported diagnosis. Preserve an exact error if one actually appears.
Separate policy, version and runtime
Compare the node's release notes and restore a compatible approved node version in a test environment. Check whether this condition belongs to the client configuration, organization policy, service status or rollout timeline.
Test an approved repair in isolation
Save the workflow JSON and record the installed custom-node versions before changing anything. In a staging system or authorized account, change only the confirmed cause and compare before/after status. Do not execute unknown scripts supplied by third-party workflow files.
Validate and prepare a support handoff
Check Python package and model compatibility without blindly reinstalling the entire application. Confirm the original operation or gather a redacted report describing the unresolved dependency. Avoid publishing tokens, private keys or recovery secrets.
Apply the least disruptive correction
Test the smallest permitted operation and keep request identifiers. Separate a model response format problem from the server-side input validation and account permissions. Do not execute multiple changes together: if the result improves, you need to know which change actually helped. Capture a before-and-after observation and document how to reverse a trial setting if it does not help.
First check: ComfyUI Workflow Breaks After Custom Node Update
Save the workflow JSON and record the installed custom-node versions before changing anything. If this test uncovers a published service limitation or a scheduled transition, update the plan rather than repeating the same installer or authorization prompt. If the symptom is confined to one device, proceed to a device-level comparison before changing account-wide settings.
Second check: isolate the dependency
Compare the node's release notes and restore a compatible approved node version in a test environment. Record the version or status displayed. A comparison is useful only when it can be reversed and when it does not accidentally submit a payment, delete files, regenerate credentials, create duplicate jobs, or overwrite saved game progress.
Advanced check: gather proof
Check Python package and model compatibility without blindly reinstalling the entire application. Collect a redacted log entry, request ID, exact version or negotiated capability as appropriate. Use a test environment for upgrades, key rotations, policy changes and firmware maintenance. Where an organization controls the device, confirm authorization before altering management settings.
Decision guide for this AI assistants, MCP and automated tools issue
If the first check reveals an unsupported version or a documented release limitation, the correct resolution is usually a planned supported upgrade or an approved alternative. If versions and support scope are correct, look for local configuration drift, a specific incompatible dependency or a service incident. Test the smallest permitted operation and keep request identifiers. Separate a model response format problem from the server-side input validation and account permissions. If these observations conflict, stop and obtain vendor clarification rather than relying on a guess.
Safety and recovery boundary
Avoid this specific risk: Do not execute unknown scripts supplied by third-party workflow files. Maintain backups or a working recovery method before making potentially irreversible changes. Do not publish credentials, license keys, private file paths, MFA recovery codes or raw customer information in support tickets. A tool that asks you to bypass policy or download a modified installer is not a trustworthy fix.
Verify the result
Repeat the original task that demonstrated the failure: A ComfyUI graph reports missing custom node inputs after an extension update. Repeat the original harmless action, validate the output shape, and confirm that retry safeguards prevent duplicate external effects. Re-test after a normal restart where relevant, without creating new side effects. If the task still fails, restore only the changes that were experimental and write down which observation remained unchanged.
Solution Checklist
What to include in a useful support request
Provide ComfyUI, the exact symptom, when it began, build or firmware version, results of the first check, results of the comparison, and the advanced evidence. Describe whether the issue impacts one account, one device or all affected clients. Do not execute unknown scripts supplied by third-party workflow files. The aim is to give support enough detail to inspect the appropriate dependency without exposing sensitive data.
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