feat: add n8n_generate_workflow tool for hosted workflow generation

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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@@ -12,6 +12,7 @@ interface ExpressionContext {
hasInputData?: boolean;
}
export declare class ExpressionValidator {
private static readonly BARE_EXPRESSION_PATTERNS;
private static readonly EXPRESSION_PATTERN;
private static readonly VARIABLE_PATTERNS;
static validateExpression(expression: string, context: ExpressionContext): ExpressionValidationResult;
@@ -21,6 +22,7 @@ export declare class ExpressionValidator {
private static checkCommonMistakes;
private static checkNodeReferences;
static validateNodeExpressions(parameters: any, context: ExpressionContext): ExpressionValidationResult;
private static checkBareExpression;
private static validateParametersRecursive;
}
export {};

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@@ -1 +1 @@
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@@ -134,6 +134,20 @@ class ExpressionValidator {
combinedResult.valid = combinedResult.errors.length === 0;
return combinedResult;
}
static checkBareExpression(value, path, result) {
if (value.includes('{{') || value.startsWith('=')) {
return;
}
const trimmed = value.trim();
for (const { pattern, name } of this.BARE_EXPRESSION_PATTERNS) {
if (pattern.test(trimmed)) {
result.warnings.push((path ? `${path}: ` : '') +
`Possible unwrapped expression: "${trimmed}" looks like an n8n ${name} reference. ` +
`Use "={{ ${trimmed} }}" to evaluate it as an expression.`);
return;
}
}
}
static validateParametersRecursive(obj, context, result, path = '', visited = new WeakSet()) {
if (obj && typeof obj === 'object') {
if (visited.has(obj)) {
@@ -142,6 +156,7 @@ class ExpressionValidator {
visited.add(obj);
}
if (typeof obj === 'string') {
this.checkBareExpression(obj, path, result);
if (obj.includes('{{')) {
const validation = this.validateExpression(obj, context);
validation.errors.forEach(error => {
@@ -168,6 +183,16 @@ class ExpressionValidator {
}
}
exports.ExpressionValidator = ExpressionValidator;
ExpressionValidator.BARE_EXPRESSION_PATTERNS = [
{ pattern: /^\$json[.\[]/, name: '$json' },
{ pattern: /^\$node\[/, name: '$node' },
{ pattern: /^\$input\./, name: '$input' },
{ pattern: /^\$execution\./, name: '$execution' },
{ pattern: /^\$workflow\./, name: '$workflow' },
{ pattern: /^\$prevNode\./, name: '$prevNode' },
{ pattern: /^\$env\./, name: '$env' },
{ pattern: /^\$(now|today|itemIndex|runIndex)$/, name: 'built-in variable' },
];
ExpressionValidator.EXPRESSION_PATTERN = /\{\{([\s\S]+?)\}\}/g;
ExpressionValidator.VARIABLE_PATTERNS = {
json: /\$json(\.[a-zA-Z_][\w]*|\["[^"]+"\]|\['[^']+'\]|\[\d+\])*/g,

File diff suppressed because one or more lines are too long

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@@ -30,10 +30,10 @@ export declare const workflowNodeSchema: z.ZodObject<{
maxTries?: number | undefined;
waitBetweenTries?: number | undefined;
alwaysOutputData?: boolean | undefined;
executeOnce?: boolean | undefined;
disabled?: boolean | undefined;
notes?: string | undefined;
notesInFlow?: boolean | undefined;
executeOnce?: boolean | undefined;
}, {
type: string;
id: string;
@@ -47,10 +47,10 @@ export declare const workflowNodeSchema: z.ZodObject<{
maxTries?: number | undefined;
waitBetweenTries?: number | undefined;
alwaysOutputData?: boolean | undefined;
executeOnce?: boolean | undefined;
disabled?: boolean | undefined;
notes?: string | undefined;
notesInFlow?: boolean | undefined;
executeOnce?: boolean | undefined;
}>;
export declare const workflowConnectionSchema: z.ZodRecord<z.ZodString, z.ZodObject<{
main: z.ZodOptional<z.ZodArray<z.ZodArray<z.ZodObject<{
@@ -413,6 +413,7 @@ export declare function cleanWorkflowForCreate(workflow: Partial<Workflow>): Par
export declare function cleanWorkflowForUpdate(workflow: Workflow): Partial<Workflow>;
export declare function validateWorkflowStructure(workflow: Partial<Workflow>): string[];
export declare function hasWebhookTrigger(workflow: Workflow): boolean;
export declare function validateConditionNodeStructure(node: WorkflowNode): string[];
export declare function validateFilterBasedNodeMetadata(node: WorkflowNode): string[];
export declare function validateOperatorStructure(operator: any, path: string): string[];
export declare function getWebhookUrl(workflow: Workflow): string | null;

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@@ -1 +1 @@
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@@ -11,6 +11,7 @@ exports.cleanWorkflowForCreate = cleanWorkflowForCreate;
exports.cleanWorkflowForUpdate = cleanWorkflowForUpdate;
exports.validateWorkflowStructure = validateWorkflowStructure;
exports.hasWebhookTrigger = hasWebhookTrigger;
exports.validateConditionNodeStructure = validateConditionNodeStructure;
exports.validateFilterBasedNodeMetadata = validateFilterBasedNodeMetadata;
exports.validateOperatorStructure = validateOperatorStructure;
exports.getWebhookUrl = getWebhookUrl;
@@ -229,7 +230,7 @@ function validateWorkflowStructure(workflow) {
}
if (workflow.nodes) {
workflow.nodes.forEach((node, index) => {
const filterErrors = validateFilterBasedNodeMetadata(node);
const filterErrors = validateConditionNodeStructure(node);
if (filterErrors.length > 0) {
errors.push(...filterErrors.map(err => `Node "${node.name}" (index ${index}): ${err}`));
}
@@ -332,73 +333,66 @@ function hasWebhookTrigger(workflow) {
return workflow.nodes.some(node => node.type === 'n8n-nodes-base.webhook' ||
node.type === 'n8n-nodes-base.webhookTrigger');
}
function validateFilterBasedNodeMetadata(node) {
function validateConditionNodeStructure(node) {
const errors = [];
const isIFNode = node.type === 'n8n-nodes-base.if' && node.typeVersion >= 2.2;
const isSwitchNode = node.type === 'n8n-nodes-base.switch' && node.typeVersion >= 3.2;
if (!isIFNode && !isSwitchNode) {
return errors;
}
if (isIFNode) {
const conditions = node.parameters.conditions;
if (!conditions?.options) {
errors.push('Missing required "conditions.options". ' +
'IF v2.2+ requires: {version: 2, leftValue: "", caseSensitive: true, typeValidation: "strict"}');
const typeVersion = node.typeVersion || 1;
if (node.type === 'n8n-nodes-base.if') {
if (typeVersion >= 2.2) {
errors.push(...validateFilterOptionsRequired(node.parameters?.conditions, 'conditions'));
errors.push(...validateFilterConditionOperators(node.parameters?.conditions, 'conditions'));
}
else {
const requiredFields = {
version: 2,
leftValue: '',
caseSensitive: 'boolean',
typeValidation: 'strict'
};
for (const [field, expectedValue] of Object.entries(requiredFields)) {
if (!(field in conditions.options)) {
errors.push(`Missing required field "conditions.options.${field}". ` +
`Expected value: ${typeof expectedValue === 'string' ? `"${expectedValue}"` : expectedValue}`);
}
else if (typeVersion >= 2) {
errors.push(...validateFilterConditionOperators(node.parameters?.conditions, 'conditions'));
}
}
else if (node.type === 'n8n-nodes-base.switch') {
if (typeVersion >= 3.2) {
const rules = node.parameters?.rules;
if (rules?.rules && Array.isArray(rules.rules)) {
rules.rules.forEach((rule, i) => {
errors.push(...validateFilterOptionsRequired(rule.conditions, `rules.rules[${i}].conditions`));
errors.push(...validateFilterConditionOperators(rule.conditions, `rules.rules[${i}].conditions`));
});
}
}
if (conditions?.conditions && Array.isArray(conditions.conditions)) {
conditions.conditions.forEach((condition, i) => {
const operatorErrors = validateOperatorStructure(condition.operator, `conditions.conditions[${i}].operator`);
errors.push(...operatorErrors);
});
}
}
if (isSwitchNode) {
const rules = node.parameters.rules;
if (rules?.rules && Array.isArray(rules.rules)) {
rules.rules.forEach((rule, ruleIndex) => {
if (!rule.conditions?.options) {
errors.push(`Missing required "rules.rules[${ruleIndex}].conditions.options". ` +
'Switch v3.2+ requires: {version: 2, leftValue: "", caseSensitive: true, typeValidation: "strict"}');
}
else {
const requiredFields = {
version: 2,
leftValue: '',
caseSensitive: 'boolean',
typeValidation: 'strict'
};
for (const [field, expectedValue] of Object.entries(requiredFields)) {
if (!(field in rule.conditions.options)) {
errors.push(`Missing required field "rules.rules[${ruleIndex}].conditions.options.${field}". ` +
`Expected value: ${typeof expectedValue === 'string' ? `"${expectedValue}"` : expectedValue}`);
}
}
}
if (rule.conditions?.conditions && Array.isArray(rule.conditions.conditions)) {
rule.conditions.conditions.forEach((condition, condIndex) => {
const operatorErrors = validateOperatorStructure(condition.operator, `rules.rules[${ruleIndex}].conditions.conditions[${condIndex}].operator`);
errors.push(...operatorErrors);
});
}
});
}
}
return errors;
}
function validateFilterOptionsRequired(conditions, path) {
const errors = [];
if (!conditions || typeof conditions !== 'object')
return errors;
if (!conditions.options) {
errors.push(`Missing required "${path}.options". ` +
'Filter-based nodes require: {version: 2, leftValue: "", caseSensitive: true, typeValidation: "strict"}');
}
else {
const requiredFields = [
['version', '2'],
['leftValue', '""'],
['caseSensitive', 'true'],
['typeValidation', '"strict"'],
];
for (const [field, display] of requiredFields) {
if (!(field in conditions.options)) {
errors.push(`Missing required field "${path}.options.${field}". Expected value: ${display}`);
}
}
}
return errors;
}
function validateFilterConditionOperators(conditions, path) {
const errors = [];
if (!conditions?.conditions || !Array.isArray(conditions.conditions))
return errors;
conditions.conditions.forEach((condition, i) => {
errors.push(...validateOperatorStructure(condition.operator, `${path}.conditions[${i}].operator`));
});
return errors;
}
function validateFilterBasedNodeMetadata(node) {
return validateConditionNodeStructure(node);
}
function validateOperatorStructure(operator, path) {
const errors = [];
if (!operator || typeof operator !== 'object') {

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@@ -1 +1 @@
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View File

@@ -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'
});
}
}

File diff suppressed because one or more lines are too long

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@@ -1 +1 @@
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@@ -14,6 +14,7 @@ const ai_node_validator_1 = require("./ai-node-validator");
const ai_tool_validators_1 = require("./ai-tool-validators");
const node_type_utils_1 = require("../utils/node-type-utils");
const node_classification_1 = require("../utils/node-classification");
const n8n_validation_1 = require("./n8n-validation");
const tool_variant_generator_1 = require("./tool-variant-generator");
const logger = new logger_1.Logger({ prefix: '[WorkflowValidator]' });
exports.VALID_CONNECTION_TYPES = new Set([
@@ -367,6 +368,17 @@ class WorkflowValidator {
message: typeof warning === 'string' ? warning : warning.message || String(warning)
});
});
if (node.type === 'n8n-nodes-base.if' || node.type === 'n8n-nodes-base.switch') {
const conditionErrors = (0, n8n_validation_1.validateConditionNodeStructure)(node);
for (const err of conditionErrors) {
result.errors.push({
type: 'error',
nodeId: node.id,
nodeName: node.name,
message: err
});
}
}
}
catch (error) {
result.errors.push({

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