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feat: add n8n_generate_workflow tool for hosted workflow generation

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Add new MCP tool that enables AI-powered workflow generation from natural
language descriptions. Uses handler delegation pattern — hosting environments
inject a GenerateWorkflowHandler via EngineOptions, self-hosted instances
receive a hosted-only informational response.

Handler flows through N8NMCPEngine → SingleSessionHTTPServer →
N8NDocumentationMCPServer with helpers for createWorkflow, validateWorkflow,
autofixWorkflow, and getWorkflow.

Includes full tool documentation, tests, and corrected tools overview count.

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:
czlonkowski
2026-03-31 12:32:31 +02:00
parent 3417c6701c
commit 198e773bb3
81 changed files with 784 additions and 177 deletions
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8
dist/services/node-specific-validators.js vendored
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@@ -1317,12 +1317,16 @@ class NodeSpecificValidators {
}
}
if (config.mode === 'manual') {
const hasFields = config.values && Object.keys(config.values).length > 0;
const hasFieldsViaValues = config.values && Object.keys(config.values).length > 0;
const hasFieldsViaAssignments = config.assignments?.assignments
&& Array.isArray(config.assignments.assignments)
&& config.assignments.assignments.length > 0;
const hasFields = hasFieldsViaValues || hasFieldsViaAssignments;
if (!hasFields && !config.jsonOutput) {
warnings.push({
type: 'missing_common',
message: 'Set node has no fields configured - will output empty items',
suggestion: 'Add fields in the Values section or use JSON mode'
suggestion: 'Add field assignments or use JSON mode'
});
}
}