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fix: correct operator names, connection types, and implement __patch_find_replace (#665, #659, #642) (#672)

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Three critical fixes in n8n_update_partial_workflow:

- **#665**: Replace incorrect `isNotEmpty`/`isEmpty` operator names with `notEmpty`/`empty`
  across validators, sanitizer, docs, and error messages. Add auto-correction in sanitizer.
  Unknown operators silently returned false in n8n's execution engine.

- **#659**: Remap numeric `targetInput` values (e.g., "0") to "main" in addConnection.
  Relax sourceOutput remapping guard for redundant sourceOutput+sourceIndex combinations.
  Also resolves #653 (dangling connections caused by malformed type:"0" connections).

- **#642**: Implement __patch_find_replace for surgical string edits in updateNode.
  Previously stored patch objects literally as jsCode, producing [object Object].
  Now reads current value, applies find/replace sequentially, writes back the string.

Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Romuald Członkowski
2026-03-27 16:26:21 +01:00
committed by GitHub
parent de2abaf89d
commit 6be9ffa53e
28 changed files with 522 additions and 96 deletions
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4
src/mcp/handlers-workflow-diff.ts
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@@ -259,9 +259,9 @@ export async function handleUpdatePartialWorkflow(
// Build recovery guidance based on error types
const recoverySteps = [];
if (errorTypes.has('operator_issues')) {
recoverySteps.push('Operator structure issue detected. Use validate_node_operation to check specific nodes.');
recoverySteps.push('Operator structure issue detected. Use validate_node to check specific nodes.');
recoverySteps.push('Binary operators (equals, contains, greaterThan, etc.) must NOT have singleValue:true');
recoverySteps.push('Unary operators (isEmpty, isNotEmpty, true, false) REQUIRE singleValue:true');
recoverySteps.push('Unary operators (empty, notEmpty, true, false) REQUIRE singleValue:true');
}
if (errorTypes.has('connection_issues')) {
recoverySteps.push('Connection validation failed. Check all node connections reference existing nodes.');