fix: auto-inject webhookId on webhook nodes during create/update (#643) (#657)

n8n 2.10+ requires webhookId (UUID) on webhook-type nodes for proper
webhook URL registration. Without it, webhooks silently fail with 404.
The n8n UI always generates webhookId but programmatic creation via
n8n-mcp did not.

Add ensureWebhookIds() helper that injects crypto.randomUUID() on
webhook, webhookTrigger, formTrigger, and chatTrigger nodes when
webhookId is missing. Called from both cleanWorkflowForCreate() and
cleanWorkflowForUpdate(). Existing webhookId values are preserved.

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

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,54 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.40.5] - 2026-03-22
+
+### Fixed
+
+- **Webhook workflows created via MCP get 404 errors** (Issue #643): Auto-inject `webhookId` (UUID) on webhook-type nodes (`webhook`, `webhookTrigger`, `formTrigger`, `chatTrigger`) during `cleanWorkflowForCreate()` and `cleanWorkflowForUpdate()`. n8n 2.10+ requires this field for proper webhook URL registration; without it, webhooks silently fail with 404. Existing `webhookId` values are preserved.
+
+Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
+
+## [2.40.4] - 2026-03-22
+
+### Fixed
+
+- **Incorrect data tables availability info**: Removed "enterprise/cloud only" restriction from tool description and documentation — data tables are available on all n8n plans including self-hosted
+- **Redundant pitfalls removed**: Removed "Requires N8N_API_URL and N8N_API_KEY" and "enterprise or cloud plans" pitfalls — the first is implicit for all n8n management tools, the second was incorrect
+
+Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
+
+## [2.40.3] - 2026-03-22
+
+### Fixed
+
+- **Notification 400 disconnect storms (#654)**: `handleRequest()` now returns 202 Accepted for JSON-RPC notifications with stale/expired session IDs instead of 400. Per JSON-RPC 2.0 spec, notifications don't expect responses — returning 400 caused Claude's proxy to trigger reconnection storms (930 errors/day, 216 users affected)
+- **TOCTOU race in session lookup**: Added null guard after transport assignment to handle sessions removed between the existence check and use
+- **`updateTable` silently ignoring `columns` parameter**: Now returns a warning message when `columns` is passed to `updateTable`, clarifying that table schema is immutable after creation via the public API
+- **Tool schema descriptions clarified**: `name` and `columns` parameter descriptions now explicitly document that `updateTable` is rename-only and columns are for `createTable` only
+
+Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
+
+## [2.40.2] - 2026-03-22
+
+### Fixed
+
+- **Double URL-encoding of `filter` and `sortBy` in `getRows`/`deleteRows`**: Moved `encodeURIComponent()` from handler layer to a custom `paramsSerializer` in the API client. Handlers were encoding values before passing them as Axios params, causing double-encoding (`%257B` instead of `%7B`). Handlers now pass raw values; the API client encodes once via `serializeDataTableParams()`
+- **`updateTable` documentation clarified**: Explicitly notes that only renaming is supported (no column modifications via public API)
+
+Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
+
+## [2.40.1] - 2026-03-21
+
+### Fixed
+
+- **`n8n_manage_datatable` row operations broken by MCP transport serialization**: `data` parameter received as string instead of JSON — added `z.preprocess` coercers for array/object/filter params
+- **`n8n_manage_datatable` filter/sortBy URL encoding**: n8n API requires URL-encoded query params — added `encodeURIComponent()` for filter and sortBy in getRows and deleteRows (revised in 2.40.2 to move encoding to API client layer)
+- **`json` column type rejected by n8n API**: Removed `json` from column type enum (n8n only accepts string/number/boolean/date)
+- **Garbled 404 error messages**: Fixed `N8nNotFoundError` constructor — API error messages are now passed through cleanly instead of being wrapped in "Resource with ID ... not found"
+
+Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
+
 ## [2.40.0] - 2026-03-21
 
 ### Changed

dist/mcp/handlers-n8n-manager.d.ts

@@ -26,4 +26,14 @@ export declare function handleDiagnostic(request: any, context?: InstanceContext
 export declare function handleWorkflowVersions(args: unknown, repository: NodeRepository, context?: InstanceContext): Promise<McpToolResponse>;
 export declare function handleDeployTemplate(args: unknown, templateService: TemplateService, repository: NodeRepository, context?: InstanceContext): Promise<McpToolResponse>;
 export declare function handleTriggerWebhookWorkflow(args: unknown, context?: InstanceContext): Promise<McpToolResponse>;
+export declare function handleCreateTable(args: unknown, context?: InstanceContext): Promise<McpToolResponse>;
+export declare function handleListTables(args: unknown, context?: InstanceContext): Promise<McpToolResponse>;
+export declare function handleGetTable(args: unknown, context?: InstanceContext): Promise<McpToolResponse>;
+export declare function handleUpdateTable(args: unknown, context?: InstanceContext): Promise<McpToolResponse>;
+export declare function handleDeleteTable(args: unknown, context?: InstanceContext): Promise<McpToolResponse>;
+export declare function handleGetRows(args: unknown, context?: InstanceContext): Promise<McpToolResponse>;
+export declare function handleInsertRows(args: unknown, context?: InstanceContext): Promise<McpToolResponse>;
+export declare function handleUpdateRows(args: unknown, context?: InstanceContext): Promise<McpToolResponse>;
+export declare function handleUpsertRows(args: unknown, context?: InstanceContext): Promise<McpToolResponse>;
+export declare function handleDeleteRows(args: unknown, context?: InstanceContext): Promise<McpToolResponse>;
 //# sourceMappingURL=handlers-n8n-manager.d.ts.map

dist/mcp/handlers-n8n-manager.d.ts.map

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dist/mcp/handlers-n8n-manager.js

@@ -56,6 +56,16 @@ exports.handleDiagnostic = handleDiagnostic;
 exports.handleWorkflowVersions = handleWorkflowVersions;
 exports.handleDeployTemplate = handleDeployTemplate;
 exports.handleTriggerWebhookWorkflow = handleTriggerWebhookWorkflow;
+exports.handleCreateTable = handleCreateTable;
+exports.handleListTables = handleListTables;
+exports.handleGetTable = handleGetTable;
+exports.handleUpdateTable = handleUpdateTable;
+exports.handleDeleteTable = handleDeleteTable;
+exports.handleGetRows = handleGetRows;
+exports.handleInsertRows = handleInsertRows;
+exports.handleUpdateRows = handleUpdateRows;
+exports.handleUpsertRows = handleUpsertRows;
+exports.handleDeleteRows = handleDeleteRows;
 const n8n_api_client_1 = require("../services/n8n-api-client");
 const n8n_api_1 = require("../config/n8n-api");
 const n8n_api_2 = require("../types/n8n-api");
@@ -175,6 +185,7 @@ const createWorkflowSchema = zod_1.z.object({
         executionTimeout: zod_1.z.number().optional(),
         errorWorkflow: zod_1.z.string().optional(),
     }).optional(),
+    projectId: zod_1.z.string().optional(),
 });
 const updateWorkflowSchema = zod_1.z.object({
     id: zod_1.z.string(),
@@ -1470,7 +1481,7 @@ async function handleDiagnostic(request, context) {
         }
     }
     const documentationTools = 7;
-    const managementTools = apiConfigured ? 13 : 0;
+    const managementTools = apiConfigured ? 14 : 0;
     const totalTools = documentationTools + managementTools;
     const versionCheck = await (0, npm_version_checker_1.checkNpmVersion)();
     const cacheMetricsData = getInstanceCacheMetrics();
@@ -2038,4 +2049,241 @@ async function handleTriggerWebhookWorkflow(args, context) {
         };
     }
 }
+const dataTableFilterConditionSchema = zod_1.z.object({
+    columnName: zod_1.z.string().min(1),
+    condition: zod_1.z.enum(['eq', 'neq', 'like', 'ilike', 'gt', 'gte', 'lt', 'lte']),
+    value: zod_1.z.any(),
+});
+const dataTableFilterSchema = zod_1.z.object({
+    type: zod_1.z.enum(['and', 'or']).optional().default('and'),
+    filters: zod_1.z.array(dataTableFilterConditionSchema).min(1, 'At least one filter condition is required'),
+});
+const tableIdSchema = zod_1.z.object({
+    tableId: zod_1.z.string().min(1, 'tableId is required'),
+});
+const createTableSchema = zod_1.z.object({
+    name: zod_1.z.string().min(1, 'Table name cannot be empty'),
+    columns: zod_1.z.array(zod_1.z.object({
+        name: zod_1.z.string().min(1, 'Column name cannot be empty'),
+        type: zod_1.z.enum(['string', 'number', 'boolean', 'date']).optional(),
+    })).optional(),
+});
+const listTablesSchema = zod_1.z.object({
+    limit: zod_1.z.number().min(1).max(100).optional(),
+    cursor: zod_1.z.string().optional(),
+});
+const updateTableSchema = tableIdSchema.extend({
+    name: zod_1.z.string().min(1, 'New table name cannot be empty'),
+});
+function tryParseJson(val) {
+    if (typeof val !== 'string')
+        return val;
+    try {
+        return JSON.parse(val);
+    }
+    catch {
+        return val;
+    }
+}
+const coerceJsonArray = zod_1.z.preprocess(tryParseJson, zod_1.z.array(zod_1.z.record(zod_1.z.unknown())));
+const coerceJsonObject = zod_1.z.preprocess(tryParseJson, zod_1.z.record(zod_1.z.unknown()));
+const coerceJsonFilter = zod_1.z.preprocess(tryParseJson, dataTableFilterSchema);
+const getRowsSchema = tableIdSchema.extend({
+    limit: zod_1.z.number().min(1).max(100).optional(),
+    cursor: zod_1.z.string().optional(),
+    filter: zod_1.z.union([coerceJsonFilter, zod_1.z.string()]).optional(),
+    sortBy: zod_1.z.string().optional(),
+    search: zod_1.z.string().optional(),
+});
+const insertRowsSchema = tableIdSchema.extend({
+    data: coerceJsonArray.pipe(zod_1.z.array(zod_1.z.record(zod_1.z.unknown())).min(1, 'At least one row is required')),
+    returnType: zod_1.z.enum(['count', 'id', 'all']).optional(),
+});
+const mutateRowsSchema = tableIdSchema.extend({
+    filter: coerceJsonFilter,
+    data: coerceJsonObject,
+    returnData: zod_1.z.boolean().optional(),
+    dryRun: zod_1.z.boolean().optional(),
+});
+const deleteRowsSchema = tableIdSchema.extend({
+    filter: coerceJsonFilter,
+    returnData: zod_1.z.boolean().optional(),
+    dryRun: zod_1.z.boolean().optional(),
+});
+function handleDataTableError(error) {
+    if (error instanceof zod_1.z.ZodError) {
+        return { success: false, error: 'Invalid input', details: { errors: error.errors } };
+    }
+    if (error instanceof n8n_errors_1.N8nApiError) {
+        return {
+            success: false,
+            error: (0, n8n_errors_1.getUserFriendlyErrorMessage)(error),
+            code: error.code,
+            details: error.details,
+        };
+    }
+    return { success: false, error: error instanceof Error ? error.message : 'Unknown error occurred' };
+}
+async function handleCreateTable(args, context) {
+    try {
+        const client = ensureApiConfigured(context);
+        const input = createTableSchema.parse(args);
+        const dataTable = await client.createDataTable(input);
+        if (!dataTable || !dataTable.id) {
+            return { success: false, error: 'Data table creation failed: n8n API returned an empty or invalid response' };
+        }
+        return {
+            success: true,
+            data: { id: dataTable.id, name: dataTable.name },
+            message: `Data table "${dataTable.name}" created with ID: ${dataTable.id}`,
+        };
+    }
+    catch (error) {
+        return handleDataTableError(error);
+    }
+}
+async function handleListTables(args, context) {
+    try {
+        const client = ensureApiConfigured(context);
+        const input = listTablesSchema.parse(args || {});
+        const result = await client.listDataTables(input);
+        return {
+            success: true,
+            data: {
+                tables: result.data,
+                count: result.data.length,
+                nextCursor: result.nextCursor || undefined,
+            },
+        };
+    }
+    catch (error) {
+        return handleDataTableError(error);
+    }
+}
+async function handleGetTable(args, context) {
+    try {
+        const client = ensureApiConfigured(context);
+        const { tableId } = tableIdSchema.parse(args);
+        const dataTable = await client.getDataTable(tableId);
+        return { success: true, data: dataTable };
+    }
+    catch (error) {
+        return handleDataTableError(error);
+    }
+}
+async function handleUpdateTable(args, context) {
+    try {
+        const client = ensureApiConfigured(context);
+        const { tableId, name } = updateTableSchema.parse(args);
+        const dataTable = await client.updateDataTable(tableId, { name });
+        return {
+            success: true,
+            data: dataTable,
+            message: `Data table renamed to "${dataTable.name}"`,
+        };
+    }
+    catch (error) {
+        return handleDataTableError(error);
+    }
+}
+async function handleDeleteTable(args, context) {
+    try {
+        const client = ensureApiConfigured(context);
+        const { tableId } = tableIdSchema.parse(args);
+        await client.deleteDataTable(tableId);
+        return { success: true, message: `Data table ${tableId} deleted successfully` };
+    }
+    catch (error) {
+        return handleDataTableError(error);
+    }
+}
+async function handleGetRows(args, context) {
+    try {
+        const client = ensureApiConfigured(context);
+        const { tableId, filter, sortBy, ...params } = getRowsSchema.parse(args);
+        const queryParams = { ...params };
+        if (filter) {
+            queryParams.filter = typeof filter === 'string' ? filter : JSON.stringify(filter);
+        }
+        if (sortBy) {
+            queryParams.sortBy = sortBy;
+        }
+        const result = await client.getDataTableRows(tableId, queryParams);
+        return {
+            success: true,
+            data: {
+                rows: result.data,
+                count: result.data.length,
+                nextCursor: result.nextCursor || undefined,
+            },
+        };
+    }
+    catch (error) {
+        return handleDataTableError(error);
+    }
+}
+async function handleInsertRows(args, context) {
+    try {
+        const client = ensureApiConfigured(context);
+        const { tableId, ...params } = insertRowsSchema.parse(args);
+        const result = await client.insertDataTableRows(tableId, params);
+        return {
+            success: true,
+            data: result,
+            message: `Rows inserted into data table ${tableId}`,
+        };
+    }
+    catch (error) {
+        return handleDataTableError(error);
+    }
+}
+async function handleUpdateRows(args, context) {
+    try {
+        const client = ensureApiConfigured(context);
+        const { tableId, ...params } = mutateRowsSchema.parse(args);
+        const result = await client.updateDataTableRows(tableId, params);
+        return {
+            success: true,
+            data: result,
+            message: params.dryRun ? 'Dry run: rows matched (no changes applied)' : 'Rows updated successfully',
+        };
+    }
+    catch (error) {
+        return handleDataTableError(error);
+    }
+}
+async function handleUpsertRows(args, context) {
+    try {
+        const client = ensureApiConfigured(context);
+        const { tableId, ...params } = mutateRowsSchema.parse(args);
+        const result = await client.upsertDataTableRow(tableId, params);
+        return {
+            success: true,
+            data: result,
+            message: params.dryRun ? 'Dry run: upsert previewed (no changes applied)' : 'Row upserted successfully',
+        };
+    }
+    catch (error) {
+        return handleDataTableError(error);
+    }
+}
+async function handleDeleteRows(args, context) {
+    try {
+        const client = ensureApiConfigured(context);
+        const { tableId, filter, ...params } = deleteRowsSchema.parse(args);
+        const queryParams = {
+            filter: JSON.stringify(filter),
+            ...params,
+        };
+        const result = await client.deleteDataTableRows(tableId, queryParams);
+        return {
+            success: true,
+            data: result,
+            message: params.dryRun ? 'Dry run: rows matched for deletion (no changes applied)' : 'Rows deleted successfully',
+        };
+    }
+    catch (error) {
+        return handleDataTableError(error);
+    }
+}
 //# sourceMappingURL=handlers-n8n-manager.js.map

dist/mcp/server.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"server.d.ts","sourceRoot":"","sources":["../../src/mcp/server.ts"],"names":[],"mappings":"AA0CA,OAAO,EAAE,eAAe,EAAE,MAAM,2BAA2B,CAAC;AAE5D,OAAO,EAAE,gBAAgB,EAAE,MAAM,iCAAiC,CAAC;AAmGnE,qBAAa,yBAAyB;IACpC,OAAO,CAAC,MAAM,CAAS;IACvB,OAAO,CAAC,EAAE,CAAgC;IAC1C,OAAO,CAAC,UAAU,CAA+B;IACjD,OAAO,CAAC,eAAe,CAAgC;IACvD,OAAO,CAAC,WAAW,CAAgB;IACnC,OAAO,CAAC,KAAK,CAAqB;IAClC,OAAO,CAAC,UAAU,CAAa;IAC/B,OAAO,CAAC,eAAe,CAAC,CAAkB;IAC1C,OAAO,CAAC,YAAY,CAAuB;IAC3C,OAAO,CAAC,qBAAqB,CAAsB;IACnD,OAAO,CAAC,WAAW,CAAiC;IACpD,OAAO,CAAC,kBAAkB,CAA4B;IACtD,OAAO,CAAC,iBAAiB,CAAkB;IAC3C,OAAO,CAAC,aAAa,CAAoC;IACzD,OAAO,CAAC,UAAU,CAAkB;gBAExB,eAAe,CAAC,EAAE,eAAe,EAAE,WAAW,CAAC,EAAE,gBAAgB;IA8GvE,KAAK,IAAI,OAAO,CAAC,IAAI,CAAC;YA+Cd,kBAAkB;YAiDlB,wBAAwB;IA0BtC,OAAO,CAAC,kBAAkB;YA6CZ,iBAAiB;IAa/B,OAAO,CAAC,eAAe,CAAkB;YAE3B,sBAAsB;IAgDpC,OAAO,CAAC,gBAAgB;IAqCxB,OAAO,CAAC,aAAa;IA0XrB,OAAO,CAAC,wBAAwB;IAoFhC,OAAO,CAAC,kBAAkB;IAqE1B,OAAO,CAAC,uBAAuB;IAwB/B,OAAO,CAAC,qBAAqB;IAiF7B,OAAO,CAAC,2BAA2B;YA0UrB,SAAS;YA2DT,WAAW;YAkFX,WAAW;YA0CX,cAAc;YA8Md,gBAAgB;IAqD9B,OAAO,CAAC,mBAAmB;IAwE3B,OAAO,CAAC,eAAe;YAsBT,eAAe;IA2L7B,OAAO,CAAC,kBAAkB;IAQ1B,OAAO,CAAC,uBAAuB;IA0D/B,OAAO,CAAC,iBAAiB;YAqFX,WAAW;YAgCX,oBAAoB;IAuFlC,OAAO,CAAC,aAAa;YAQP,qBAAqB;YAwDrB,iBAAiB;YAiKjB,OAAO;YAgDP,cAAc;YAwFd,iBAAiB;IAqC/B,OAAO,CAAC,iBAAiB;IA0BzB,OAAO,CAAC,iBAAiB;IA0BzB,OAAO,CAAC,eAAe;IAwCvB,OAAO,CAAC,kBAAkB;IAiC1B,OAAO,CAAC,aAAa;IAoCrB,OAAO,CAAC,0BAA0B;IAgClC,OAAO,CAAC,4BAA4B;YAKtB,oBAAoB;IAsDlC,OAAO,CAAC,gBAAgB;YAiBV,SAAS;YA6CT,kBAAkB;YAqElB,uBAAuB;YAsDvB,iBAAiB;IAqE/B,OAAO,CAAC,qBAAqB;IA8C7B,OAAO,CAAC,uBAAuB;IA4D/B,OAAO,CAAC,wBAAwB;IAkChC,OAAO,CAAC,iBAAiB;YAoDX,mBAAmB;YAoEnB,qBAAqB;IAS7B,OAAO,CAAC,SAAS,EAAE,GAAG,GAAG,OAAO,CAAC,IAAI,CAAC;YAS9B,aAAa;YAcb,iBAAiB;YAoBjB,WAAW;YAwBX,eAAe;YAqBf,mBAAmB;YAwBnB,yBAAyB;IA4CvC,OAAO,CAAC,kBAAkB;YAiBZ,gBAAgB;YA6HhB,2BAA2B;YAiE3B,2BAA2B;IAyEnC,GAAG,IAAI,OAAO,CAAC,IAAI,CAAC;IA0BpB,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;CAgEhC"}
+{"version":3,"file":"server.d.ts","sourceRoot":"","sources":["../../src/mcp/server.ts"],"names":[],"mappings":"AA0CA,OAAO,EAAE,eAAe,EAAE,MAAM,2BAA2B,CAAC;AAE5D,OAAO,EAAE,gBAAgB,EAAE,MAAM,iCAAiC,CAAC;AAmGnE,qBAAa,yBAAyB;IACpC,OAAO,CAAC,MAAM,CAAS;IACvB,OAAO,CAAC,EAAE,CAAgC;IAC1C,OAAO,CAAC,UAAU,CAA+B;IACjD,OAAO,CAAC,eAAe,CAAgC;IACvD,OAAO,CAAC,WAAW,CAAgB;IACnC,OAAO,CAAC,KAAK,CAAqB;IAClC,OAAO,CAAC,UAAU,CAAa;IAC/B,OAAO,CAAC,eAAe,CAAC,CAAkB;IAC1C,OAAO,CAAC,YAAY,CAAuB;IAC3C,OAAO,CAAC,qBAAqB,CAAsB;IACnD,OAAO,CAAC,WAAW,CAAiC;IACpD,OAAO,CAAC,kBAAkB,CAA4B;IACtD,OAAO,CAAC,iBAAiB,CAAkB;IAC3C,OAAO,CAAC,aAAa,CAAoC;IACzD,OAAO,CAAC,UAAU,CAAkB;gBAExB,eAAe,CAAC,EAAE,eAAe,EAAE,WAAW,CAAC,EAAE,gBAAgB;IA8GvE,KAAK,IAAI,OAAO,CAAC,IAAI,CAAC;YA+Cd,kBAAkB;YAiDlB,wBAAwB;IA0BtC,OAAO,CAAC,kBAAkB;YA6CZ,iBAAiB;IAa/B,OAAO,CAAC,eAAe,CAAkB;YAE3B,sBAAsB;IAgDpC,OAAO,CAAC,gBAAgB;IAqCxB,OAAO,CAAC,aAAa;IA0XrB,OAAO,CAAC,wBAAwB;IAoFhC,OAAO,CAAC,kBAAkB;IA0E1B,OAAO,CAAC,uBAAuB;IAwB/B,OAAO,CAAC,qBAAqB;IAiF7B,OAAO,CAAC,2BAA2B;YA8VrB,SAAS;YA2DT,WAAW;YAkFX,WAAW;YA0CX,cAAc;YA8Md,gBAAgB;IAqD9B,OAAO,CAAC,mBAAmB;IAwE3B,OAAO,CAAC,eAAe;YAsBT,eAAe;IA2L7B,OAAO,CAAC,kBAAkB;IAQ1B,OAAO,CAAC,uBAAuB;IA0D/B,OAAO,CAAC,iBAAiB;YAqFX,WAAW;YAgCX,oBAAoB;IAuFlC,OAAO,CAAC,aAAa;YAQP,qBAAqB;YAwDrB,iBAAiB;YAiKjB,OAAO;YAgDP,cAAc;YAwFd,iBAAiB;IAqC/B,OAAO,CAAC,iBAAiB;IA0BzB,OAAO,CAAC,iBAAiB;IA0BzB,OAAO,CAAC,eAAe;IAwCvB,OAAO,CAAC,kBAAkB;IAiC1B,OAAO,CAAC,aAAa;IAoCrB,OAAO,CAAC,0BAA0B;IAgClC,OAAO,CAAC,4BAA4B;YAKtB,oBAAoB;IAsDlC,OAAO,CAAC,gBAAgB;YAiBV,SAAS;YA6CT,kBAAkB;YAqElB,uBAAuB;YAsDvB,iBAAiB;IAqE/B,OAAO,CAAC,qBAAqB;IA8C7B,OAAO,CAAC,uBAAuB;IA4D/B,OAAO,CAAC,wBAAwB;IAkChC,OAAO,CAAC,iBAAiB;YAoDX,mBAAmB;YAoEnB,qBAAqB;IAS7B,OAAO,CAAC,SAAS,EAAE,GAAG,GAAG,OAAO,CAAC,IAAI,CAAC;YAS9B,aAAa;YAcb,iBAAiB;YAoBjB,WAAW;YAwBX,eAAe;YAqBf,mBAAmB;YAwBnB,yBAAyB;IA4CvC,OAAO,CAAC,kBAAkB;YAiBZ,gBAAgB;YA6HhB,2BAA2B;YAiE3B,2BAA2B;IAyEnC,GAAG,IAAI,OAAO,CAAC,IAAI,CAAC;IA0BpB,QAAQ,IAAI,OAAO,CAAC,IAAI,CAAC;CAgEhC"}

dist/mcp/server.js

@@ -720,6 +720,11 @@ class N8NDocumentationMCPServer {
                         ? { valid: true, errors: [] }
                         : { valid: false, errors: [{ field: 'action', message: 'action is required' }] };
                     break;
+                case 'n8n_manage_datatable':
+                    validationResult = args.action
+                        ? { valid: true, errors: [] }
+                        : { valid: false, errors: [{ field: 'action', message: 'action is required' }] };
+                    break;
                 case 'n8n_deploy_template':
                     validationResult = args.templateId !== undefined
                         ? { valid: true, errors: [] }
@@ -1109,6 +1114,24 @@ class N8NDocumentationMCPServer {
                 if (!this.repository)
                     throw new Error('Repository not initialized');
                 return n8nHandlers.handleDeployTemplate(args, this.templateService, this.repository, this.instanceContext);
+            case 'n8n_manage_datatable': {
+                this.validateToolParams(name, args, ['action']);
+                const dtAction = args.action;
+                switch (dtAction) {
+                    case 'createTable': return n8nHandlers.handleCreateTable(args, this.instanceContext);
+                    case 'listTables': return n8nHandlers.handleListTables(args, this.instanceContext);
+                    case 'getTable': return n8nHandlers.handleGetTable(args, this.instanceContext);
+                    case 'updateTable': return n8nHandlers.handleUpdateTable(args, this.instanceContext);
+                    case 'deleteTable': return n8nHandlers.handleDeleteTable(args, this.instanceContext);
+                    case 'getRows': return n8nHandlers.handleGetRows(args, this.instanceContext);
+                    case 'insertRows': return n8nHandlers.handleInsertRows(args, this.instanceContext);
+                    case 'updateRows': return n8nHandlers.handleUpdateRows(args, this.instanceContext);
+                    case 'upsertRows': return n8nHandlers.handleUpsertRows(args, this.instanceContext);
+                    case 'deleteRows': return n8nHandlers.handleDeleteRows(args, this.instanceContext);
+                    default:
+                        throw new Error(`Unknown action: ${dtAction}. Valid actions: createTable, listTables, getTable, updateTable, deleteTable, getRows, insertRows, updateRows, upsertRows, deleteRows`);
+                }
+            }
             default:
                 throw new Error(`Unknown tool: ${name}`);
         }

dist/mcp/tool-docs/index.d.ts.map

@@ -1 +1 @@
-{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../../../src/mcp/tool-docs/index.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,iBAAiB,EAAE,MAAM,SAAS,CAAC;AA4B5C,eAAO,MAAM,kBAAkB,EAAE,MAAM,CAAC,MAAM,EAAE,iBAAiB,CAmChE,CAAC;AAGF,YAAY,EAAE,iBAAiB,EAAE,MAAM,SAAS,CAAC"}
+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../../../src/mcp/tool-docs/index.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,iBAAiB,EAAE,MAAM,SAAS,CAAC;AA6B5C,eAAO,MAAM,kBAAkB,EAAE,MAAM,CAAC,MAAM,EAAE,iBAAiB,CAoChE,CAAC;AAGF,YAAY,EAAE,iBAAiB,EAAE,MAAM,SAAS,CAAC"}

dist/mcp/tool-docs/index.js

@@ -29,6 +29,7 @@ exports.toolsDocumentation = {
     n8n_test_workflow: workflow_management_1.n8nTestWorkflowDoc,
     n8n_executions: workflow_management_1.n8nExecutionsDoc,
     n8n_workflow_versions: workflow_management_1.n8nWorkflowVersionsDoc,
-    n8n_deploy_template: workflow_management_1.n8nDeployTemplateDoc
+    n8n_deploy_template: workflow_management_1.n8nDeployTemplateDoc,
+    n8n_manage_datatable: workflow_management_1.n8nManageDatatableDoc
 };
 //# sourceMappingURL=index.js.map

dist/mcp/tool-docs/index.js.map

@@ -1 +1 @@
-{"version":3,"file":"index.js","sourceRoot":"","sources":["../../../src/mcp/tool-docs/index.ts"],"names":[],"mappings":";;;AAGA,2CAA6C;AAC7C,mDAA6C;AAC7C,6CAAoE;AACpE,2CAAiE;AACjE,qCAGkB;AAClB,qCAAyC;AACzC,+DAa+B;AAGlB,QAAA,kBAAkB,GAAsC;IAEnE,mBAAmB,EAAE,8BAAqB;IAC1C,gBAAgB,EAAE,0BAAiB;IAGnC,eAAe,EAAE,sBAAa;IAG9B,YAAY,EAAE,0BAAc;IAG5B,QAAQ,EAAE,0BAAU;IAGpB,aAAa,EAAE,4BAAe;IAC9B,iBAAiB,EAAE,gCAAmB;IAGtC,YAAY,EAAE,0BAAc;IAC5B,gBAAgB,EAAE,8BAAkB;IAGpC,mBAAmB,EAAE,0CAAoB;IACzC,gBAAgB,EAAE,uCAAiB;IACnC,wBAAwB,EAAE,8CAAwB;IAClD,2BAA2B,EAAE,iDAA2B;IACxD,mBAAmB,EAAE,0CAAoB;IACzC,kBAAkB,EAAE,yCAAmB;IACvC,qBAAqB,EAAE,4CAAsB;IAC7C,oBAAoB,EAAE,2CAAqB;IAC3C,iBAAiB,EAAE,wCAAkB;IACrC,cAAc,EAAE,sCAAgB;IAChC,qBAAqB,EAAE,4CAAsB;IAC7C,mBAAmB,EAAE,0CAAoB;CAC1C,CAAC"}
+{"version":3,"file":"index.js","sourceRoot":"","sources":["../../../src/mcp/tool-docs/index.ts"],"names":[],"mappings":";;;AAGA,2CAA6C;AAC7C,mDAA6C;AAC7C,6CAAoE;AACpE,2CAAiE;AACjE,qCAGkB;AAClB,qCAAyC;AACzC,+DAc+B;AAGlB,QAAA,kBAAkB,GAAsC;IAEnE,mBAAmB,EAAE,8BAAqB;IAC1C,gBAAgB,EAAE,0BAAiB;IAGnC,eAAe,EAAE,sBAAa;IAG9B,YAAY,EAAE,0BAAc;IAG5B,QAAQ,EAAE,0BAAU;IAGpB,aAAa,EAAE,4BAAe;IAC9B,iBAAiB,EAAE,gCAAmB;IAGtC,YAAY,EAAE,0BAAc;IAC5B,gBAAgB,EAAE,8BAAkB;IAGpC,mBAAmB,EAAE,0CAAoB;IACzC,gBAAgB,EAAE,uCAAiB;IACnC,wBAAwB,EAAE,8CAAwB;IAClD,2BAA2B,EAAE,iDAA2B;IACxD,mBAAmB,EAAE,0CAAoB;IACzC,kBAAkB,EAAE,yCAAmB;IACvC,qBAAqB,EAAE,4CAAsB;IAC7C,oBAAoB,EAAE,2CAAqB;IAC3C,iBAAiB,EAAE,wCAAkB;IACrC,cAAc,EAAE,sCAAgB;IAChC,qBAAqB,EAAE,4CAAsB;IAC7C,mBAAmB,EAAE,0CAAoB;IACzC,oBAAoB,EAAE,2CAAqB;CAC5C,CAAC"}

dist/mcp/tool-docs/workflow_management/index.d.ts

@@ -10,4 +10,5 @@ export { n8nTestWorkflowDoc } from './n8n-test-workflow';
 export { n8nExecutionsDoc } from './n8n-executions';
 export { n8nWorkflowVersionsDoc } from './n8n-workflow-versions';
 export { n8nDeployTemplateDoc } from './n8n-deploy-template';
+export { n8nManageDatatableDoc } from './n8n-manage-datatable';
 //# sourceMappingURL=index.d.ts.map

dist/mcp/tool-docs/workflow_management/index.d.ts.map

@@ -1 +1 @@
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+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../../../../src/mcp/tool-docs/workflow_management/index.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,oBAAoB,EAAE,MAAM,uBAAuB,CAAC;AAC7D,OAAO,EAAE,iBAAiB,EAAE,MAAM,oBAAoB,CAAC;AACvD,OAAO,EAAE,wBAAwB,EAAE,MAAM,4BAA4B,CAAC;AACtE,OAAO,EAAE,2BAA2B,EAAE,MAAM,+BAA+B,CAAC;AAC5E,OAAO,EAAE,oBAAoB,EAAE,MAAM,uBAAuB,CAAC;AAC7D,OAAO,EAAE,mBAAmB,EAAE,MAAM,sBAAsB,CAAC;AAC3D,OAAO,EAAE,sBAAsB,EAAE,MAAM,yBAAyB,CAAC;AACjE,OAAO,EAAE,qBAAqB,EAAE,MAAM,wBAAwB,CAAC;AAC/D,OAAO,EAAE,kBAAkB,EAAE,MAAM,qBAAqB,CAAC;AACzD,OAAO,EAAE,gBAAgB,EAAE,MAAM,kBAAkB,CAAC;AACpD,OAAO,EAAE,sBAAsB,EAAE,MAAM,yBAAyB,CAAC;AACjE,OAAO,EAAE,oBAAoB,EAAE,MAAM,uBAAuB,CAAC;AAC7D,OAAO,EAAE,qBAAqB,EAAE,MAAM,wBAAwB,CAAC"}

dist/mcp/tool-docs/workflow_management/index.js

@@ -1,6 +1,6 @@
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.n8nDeployTemplateDoc = exports.n8nWorkflowVersionsDoc = exports.n8nExecutionsDoc = exports.n8nTestWorkflowDoc = exports.n8nAutofixWorkflowDoc = exports.n8nValidateWorkflowDoc = exports.n8nListWorkflowsDoc = exports.n8nDeleteWorkflowDoc = exports.n8nUpdatePartialWorkflowDoc = exports.n8nUpdateFullWorkflowDoc = exports.n8nGetWorkflowDoc = exports.n8nCreateWorkflowDoc = void 0;
+exports.n8nManageDatatableDoc = exports.n8nDeployTemplateDoc = exports.n8nWorkflowVersionsDoc = exports.n8nExecutionsDoc = exports.n8nTestWorkflowDoc = exports.n8nAutofixWorkflowDoc = exports.n8nValidateWorkflowDoc = exports.n8nListWorkflowsDoc = exports.n8nDeleteWorkflowDoc = exports.n8nUpdatePartialWorkflowDoc = exports.n8nUpdateFullWorkflowDoc = exports.n8nGetWorkflowDoc = exports.n8nCreateWorkflowDoc = void 0;
 var n8n_create_workflow_1 = require("./n8n-create-workflow");
 Object.defineProperty(exports, "n8nCreateWorkflowDoc", { enumerable: true, get: function () { return n8n_create_workflow_1.n8nCreateWorkflowDoc; } });
 var n8n_get_workflow_1 = require("./n8n-get-workflow");
@@ -25,4 +25,6 @@ var n8n_workflow_versions_1 = require("./n8n-workflow-versions");
 Object.defineProperty(exports, "n8nWorkflowVersionsDoc", { enumerable: true, get: function () { return n8n_workflow_versions_1.n8nWorkflowVersionsDoc; } });
 var n8n_deploy_template_1 = require("./n8n-deploy-template");
 Object.defineProperty(exports, "n8nDeployTemplateDoc", { enumerable: true, get: function () { return n8n_deploy_template_1.n8nDeployTemplateDoc; } });
+var n8n_manage_datatable_1 = require("./n8n-manage-datatable");
+Object.defineProperty(exports, "n8nManageDatatableDoc", { enumerable: true, get: function () { return n8n_manage_datatable_1.n8nManageDatatableDoc; } });
 //# sourceMappingURL=index.js.map

dist/mcp/tool-docs/workflow_management/index.js.map

@@ -1 +1 @@
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+{"version":3,"file":"index.js","sourceRoot":"","sources":["../../../../src/mcp/tool-docs/workflow_management/index.ts"],"names":[],"mappings":";;;AAAA,6DAA6D;AAApD,2HAAA,oBAAoB,OAAA;AAC7B,uDAAuD;AAA9C,qHAAA,iBAAiB,OAAA;AAC1B,uEAAsE;AAA7D,oIAAA,wBAAwB,OAAA;AACjC,6EAA4E;AAAnE,0IAAA,2BAA2B,OAAA;AACpC,6DAA6D;AAApD,2HAAA,oBAAoB,OAAA;AAC7B,2DAA2D;AAAlD,yHAAA,mBAAmB,OAAA;AAC5B,iEAAiE;AAAxD,+HAAA,sBAAsB,OAAA;AAC/B,+DAA+D;AAAtD,6HAAA,qBAAqB,OAAA;AAC9B,yDAAyD;AAAhD,uHAAA,kBAAkB,OAAA;AAC3B,mDAAoD;AAA3C,kHAAA,gBAAgB,OAAA;AACzB,iEAAiE;AAAxD,+HAAA,sBAAsB,OAAA;AAC/B,6DAA6D;AAApD,2HAAA,oBAAoB,OAAA;AAC7B,+DAA+D;AAAtD,6HAAA,qBAAqB,OAAA"}

dist/mcp/tools-n8n-manager.d.ts.map

@@ -1 +1 @@
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+{"version":3,"file":"tools-n8n-manager.d.ts","sourceRoot":"","sources":["../../src/mcp/tools-n8n-manager.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,cAAc,EAAE,MAAM,UAAU,CAAC;AAQ1C,eAAO,MAAM,kBAAkB,EAAE,cAAc,EAwoB9C,CAAC"}

dist/mcp/tools-n8n-manager.js

@@ -57,6 +57,10 @@ exports.n8nManagementTools = [
                         executionTimeout: { type: 'number' },
                         errorWorkflow: { type: 'string' }
                     }
+                },
+                projectId: {
+                    type: 'string',
+                    description: 'Optional project ID to create the workflow in (enterprise feature)'
                 }
             },
             required: ['name', 'nodes', 'connections']
@@ -583,6 +587,53 @@ exports.n8nManagementTools = [
             destructiveHint: false,
             openWorldHint: true,
         },
-    }
+    },
+    {
+        name: 'n8n_manage_datatable',
+        description: `Manage n8n data tables and rows. Actions: createTable, listTables, getTable, updateTable, deleteTable, getRows, insertRows, updateRows, upsertRows, deleteRows. Requires n8n enterprise/cloud with data tables feature.`,
+        inputSchema: {
+            type: 'object',
+            properties: {
+                action: {
+                    type: 'string',
+                    enum: ['createTable', 'listTables', 'getTable', 'updateTable', 'deleteTable', 'getRows', 'insertRows', 'updateRows', 'upsertRows', 'deleteRows'],
+                    description: 'Operation to perform',
+                },
+                tableId: { type: 'string', description: 'Data table ID (required for all actions except createTable and listTables)' },
+                name: { type: 'string', description: 'For createTable/updateTable: table name' },
+                columns: {
+                    type: 'array',
+                    description: 'For createTable: column definitions',
+                    items: {
+                        type: 'object',
+                        properties: {
+                            name: { type: 'string' },
+                            type: { type: 'string', enum: ['string', 'number', 'boolean', 'date'] },
+                        },
+                        required: ['name'],
+                    },
+                },
+                data: { description: 'For insertRows: array of row objects. For updateRows/upsertRows: object with column values.' },
+                filter: {
+                    type: 'object',
+                    description: 'For getRows/updateRows/upsertRows/deleteRows: {type?: "and"|"or", filters: [{columnName, condition, value}]}',
+                },
+                limit: { type: 'number', description: 'For listTables/getRows: max results (1-100)' },
+                cursor: { type: 'string', description: 'For listTables/getRows: pagination cursor' },
+                sortBy: { type: 'string', description: 'For getRows: "columnName:asc" or "columnName:desc"' },
+                search: { type: 'string', description: 'For getRows: text search across string columns' },
+                returnType: { type: 'string', enum: ['count', 'id', 'all'], description: 'For insertRows: what to return (default: count)' },
+                returnData: { type: 'boolean', description: 'For updateRows/upsertRows/deleteRows: return affected rows (default: false)' },
+                dryRun: { type: 'boolean', description: 'For updateRows/upsertRows/deleteRows: preview without applying (default: false)' },
+            },
+            required: ['action'],
+        },
+        annotations: {
+            title: 'Manage Data Tables',
+            readOnlyHint: false,
+            destructiveHint: true,
+            openWorldHint: true,
+        },
+    },
 ];
 //# sourceMappingURL=tools-n8n-manager.js.map

dist/services/n8n-api-client.d.ts

@@ -1,4 +1,4 @@
-import { Workflow, WorkflowListParams, WorkflowListResponse, Execution, ExecutionListParams, ExecutionListResponse, Credential, CredentialListParams, CredentialListResponse, Tag, TagListParams, TagListResponse, HealthCheckResponse, N8nVersionInfo, Variable, WebhookRequest, SourceControlStatus, SourceControlPullResult, SourceControlPushResult } from '../types/n8n-api';
+import { Workflow, WorkflowListParams, WorkflowListResponse, Execution, ExecutionListParams, ExecutionListResponse, Credential, CredentialListParams, CredentialListResponse, Tag, TagListParams, TagListResponse, HealthCheckResponse, N8nVersionInfo, Variable, WebhookRequest, SourceControlStatus, SourceControlPullResult, SourceControlPushResult, DataTable, DataTableColumn, DataTableListParams, DataTableRow, DataTableRowListParams, DataTableInsertRowsParams, DataTableUpdateRowsParams, DataTableUpsertRowParams, DataTableDeleteRowsParams } from '../types/n8n-api';
 export interface N8nApiClientConfig {
     baseUrl: string;
     apiKey: string;
@@ -45,6 +45,28 @@ export declare class N8nApiClient {
     createVariable(variable: Partial<Variable>): Promise<Variable>;
     updateVariable(id: string, variable: Partial<Variable>): Promise<Variable>;
     deleteVariable(id: string): Promise<void>;
+    createDataTable(params: {
+        name: string;
+        columns?: DataTableColumn[];
+    }): Promise<DataTable>;
+    listDataTables(params?: DataTableListParams): Promise<{
+        data: DataTable[];
+        nextCursor?: string | null;
+    }>;
+    getDataTable(id: string): Promise<DataTable>;
+    updateDataTable(id: string, params: {
+        name: string;
+    }): Promise<DataTable>;
+    deleteDataTable(id: string): Promise<void>;
+    getDataTableRows(id: string, params?: DataTableRowListParams): Promise<{
+        data: DataTableRow[];
+        nextCursor?: string | null;
+    }>;
+    insertDataTableRows(id: string, params: DataTableInsertRowsParams): Promise<any>;
+    updateDataTableRows(id: string, params: DataTableUpdateRowsParams): Promise<any>;
+    upsertDataTableRow(id: string, params: DataTableUpsertRowParams): Promise<any>;
+    deleteDataTableRows(id: string, params: DataTableDeleteRowsParams): Promise<any>;
+    private serializeDataTableParams;
     private validateListResponse;
 }
 //# sourceMappingURL=n8n-api-client.d.ts.map

dist/services/n8n-api-client.d.ts.map

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dist/services/n8n-api-client.js

@@ -448,6 +448,110 @@ class N8nApiClient {
             throw (0, n8n_errors_1.handleN8nApiError)(error);
         }
     }
+    async createDataTable(params) {
+        try {
+            const response = await this.client.post('/data-tables', params);
+            return response.data;
+        }
+        catch (error) {
+            throw (0, n8n_errors_1.handleN8nApiError)(error);
+        }
+    }
+    async listDataTables(params = {}) {
+        try {
+            const response = await this.client.get('/data-tables', { params });
+            return this.validateListResponse(response.data, 'data-tables');
+        }
+        catch (error) {
+            throw (0, n8n_errors_1.handleN8nApiError)(error);
+        }
+    }
+    async getDataTable(id) {
+        try {
+            const response = await this.client.get(`/data-tables/${id}`);
+            return response.data;
+        }
+        catch (error) {
+            throw (0, n8n_errors_1.handleN8nApiError)(error);
+        }
+    }
+    async updateDataTable(id, params) {
+        try {
+            const response = await this.client.patch(`/data-tables/${id}`, params);
+            return response.data;
+        }
+        catch (error) {
+            throw (0, n8n_errors_1.handleN8nApiError)(error);
+        }
+    }
+    async deleteDataTable(id) {
+        try {
+            await this.client.delete(`/data-tables/${id}`);
+        }
+        catch (error) {
+            throw (0, n8n_errors_1.handleN8nApiError)(error);
+        }
+    }
+    async getDataTableRows(id, params = {}) {
+        try {
+            const response = await this.client.get(`/data-tables/${id}/rows`, {
+                params,
+                paramsSerializer: (p) => this.serializeDataTableParams(p),
+            });
+            return this.validateListResponse(response.data, 'data-table-rows');
+        }
+        catch (error) {
+            throw (0, n8n_errors_1.handleN8nApiError)(error);
+        }
+    }
+    async insertDataTableRows(id, params) {
+        try {
+            const response = await this.client.post(`/data-tables/${id}/rows`, params);
+            return response.data;
+        }
+        catch (error) {
+            throw (0, n8n_errors_1.handleN8nApiError)(error);
+        }
+    }
+    async updateDataTableRows(id, params) {
+        try {
+            const response = await this.client.patch(`/data-tables/${id}/rows/update`, params);
+            return response.data;
+        }
+        catch (error) {
+            throw (0, n8n_errors_1.handleN8nApiError)(error);
+        }
+    }
+    async upsertDataTableRow(id, params) {
+        try {
+            const response = await this.client.post(`/data-tables/${id}/rows/upsert`, params);
+            return response.data;
+        }
+        catch (error) {
+            throw (0, n8n_errors_1.handleN8nApiError)(error);
+        }
+    }
+    async deleteDataTableRows(id, params) {
+        try {
+            const response = await this.client.delete(`/data-tables/${id}/rows/delete`, {
+                params,
+                paramsSerializer: (p) => this.serializeDataTableParams(p),
+            });
+            return response.data;
+        }
+        catch (error) {
+            throw (0, n8n_errors_1.handleN8nApiError)(error);
+        }
+    }
+    serializeDataTableParams(params) {
+        const parts = [];
+        for (const [key, value] of Object.entries(params)) {
+            if (value === undefined || value === null)
+                continue;
+            parts.push(`${encodeURIComponent(key)}=${encodeURIComponent(String(value))}`);
+        }
+        return parts.join('&');
+    }
     validateListResponse(responseData, resourceType) {
         if (!responseData || typeof responseData !== 'object') {
             throw new Error(`Invalid response from n8n API for ${resourceType}: response is not an object`);

dist/services/n8n-validation.d.ts.map

@@ -1 +1 @@
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+{"version":3,"file":"n8n-validation.d.ts","sourceRoot":"","sources":["../../src/services/n8n-validation.ts"],"names":[],"mappings":"AACA,OAAO,EAAE,CAAC,EAAE,MAAM,KAAK,CAAC;AACxB,OAAO,EAAE,YAAY,EAAE,kBAAkB,EAAE,QAAQ,EAAE,MAAM,kBAAkB,CAAC;AAM9E,eAAO,MAAM,kBAAkB;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;EAiB7B,CAAC;AAkBH,eAAO,MAAM,wBAAwB;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;gCAUpC,CAAC;AAEF,eAAO,MAAM,sBAAsB;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;EAWjC,CAAC;AAGH,eAAO,MAAM,uBAAuB;;;;;;CAMnC,CAAC;AAGF,wBAAgB,oBAAoB,CAAC,IAAI,EAAE,OAAO,GAAG,YAAY,CAEhE;AAED,wBAAgB,2BAA2B,CAAC,WAAW,EAAE,OAAO,GAAG,kBAAkB,CAEpF;AAED,wBAAgB,wBAAwB,CAAC,QAAQ,EAAE,OAAO,GAAG,CAAC,CAAC,KAAK,CAAC,OAAO,sBAAsB,CAAC,CAElG;AAmBD,wBAAgB,sBAAsB,CAAC,QAAQ,EAAE,OAAO,CAAC,QAAQ,CAAC,GAAG,OAAO,CAAC,QAAQ,CAAC,CAwBrF;AAiBD,wBAAgB,sBAAsB,CAAC,QAAQ,EAAE,QAAQ,GAAG,OAAO,CAAC,QAAQ,CAAC,CAsE5E;AAGD,wBAAgB,yBAAyB,CAAC,QAAQ,EAAE,OAAO,CAAC,QAAQ,CAAC,GAAG,MAAM,EAAE,CAkQ/E;AAGD,wBAAgB,iBAAiB,CAAC,QAAQ,EAAE,QAAQ,GAAG,OAAO,CAK7D;AAMD,wBAAgB,+BAA+B,CAAC,IAAI,EAAE,YAAY,GAAG,MAAM,EAAE,CA+F5E;AAMD,wBAAgB,yBAAyB,CAAC,QAAQ,EAAE,GAAG,EAAE,IAAI,EAAE,MAAM,GAAG,MAAM,EAAE,CA0D/E;AAGD,wBAAgB,aAAa,CAAC,QAAQ,EAAE,QAAQ,GAAG,MAAM,GAAG,IAAI,CAmB/D;AAGD,wBAAgB,2BAA2B,IAAI,MAAM,CA6CpD;AAGD,wBAAgB,yBAAyB,CAAC,MAAM,EAAE,MAAM,EAAE,GAAG,MAAM,EAAE,CAmBpE"}

dist/services/n8n-validation.js

@@ -1,4 +1,7 @@
 "use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.defaultWorkflowSettings = exports.workflowSettingsSchema = exports.workflowConnectionSchema = exports.workflowNodeSchema = void 0;
 exports.validateWorkflowNode = validateWorkflowNode;
@@ -13,6 +16,7 @@ exports.validateOperatorStructure = validateOperatorStructure;
 exports.getWebhookUrl = getWebhookUrl;
 exports.getWorkflowStructureExample = getWorkflowStructureExample;
 exports.getWorkflowFixSuggestions = getWorkflowFixSuggestions;
+const crypto_1 = __importDefault(require("crypto"));
 const zod_1 = require("zod");
 const node_type_utils_1 = require("../utils/node-type-utils");
 const node_classification_1 = require("../utils/node-classification");
@@ -76,11 +80,27 @@ function validateWorkflowConnections(connections) {
 function validateWorkflowSettings(settings) {
     return exports.workflowSettingsSchema.parse(settings);
 }
+const WEBHOOK_NODE_TYPES = new Set([
+    'n8n-nodes-base.webhook',
+    'n8n-nodes-base.webhookTrigger',
+    'n8n-nodes-base.formTrigger',
+    '@n8n/n8n-nodes-langchain.chatTrigger',
+]);
+function ensureWebhookIds(nodes) {
+    if (!nodes)
+        return;
+    for (const node of nodes) {
+        if (WEBHOOK_NODE_TYPES.has(node.type) && !node.webhookId) {
+            node.webhookId = crypto_1.default.randomUUID();
+        }
+    }
+}
 function cleanWorkflowForCreate(workflow) {
     const { id, createdAt, updatedAt, versionId, meta, active, tags, ...cleanedWorkflow } = workflow;
     if (!cleanedWorkflow.settings || Object.keys(cleanedWorkflow.settings).length === 0) {
         cleanedWorkflow.settings = exports.defaultWorkflowSettings;
     }
+    ensureWebhookIds(cleanedWorkflow.nodes);
     return cleanedWorkflow;
 }
 function cleanWorkflowForUpdate(workflow) {
@@ -116,6 +136,7 @@ function cleanWorkflowForUpdate(workflow) {
     else {
         cleanedWorkflow.settings = { executionOrder: 'v1' };
     }
+    ensureWebhookIds(cleanedWorkflow.nodes);
     return cleanedWorkflow;
 }
 function validateWorkflowStructure(workflow) {

dist/types/n8n-api.d.ts

@@ -374,4 +374,69 @@ export interface ErrorSuggestion {
     description: string;
     confidence: 'high' | 'medium' | 'low';
 }
+export interface DataTableColumn {
+    name: string;
+    type?: 'string' | 'number' | 'boolean' | 'date';
+}
+export interface DataTableColumnResponse {
+    id: string;
+    name: string;
+    type: 'string' | 'number' | 'boolean' | 'date';
+    index: number;
+}
+export interface DataTable {
+    id: string;
+    name: string;
+    columns?: DataTableColumnResponse[];
+    projectId?: string;
+    createdAt?: string;
+    updatedAt?: string;
+}
+export interface DataTableRow {
+    id?: number;
+    createdAt?: string;
+    updatedAt?: string;
+    [columnName: string]: unknown;
+}
+export interface DataTableFilterCondition {
+    columnName: string;
+    condition: 'eq' | 'neq' | 'like' | 'ilike' | 'gt' | 'gte' | 'lt' | 'lte';
+    value?: any;
+}
+export interface DataTableFilter {
+    type?: 'and' | 'or';
+    filters: DataTableFilterCondition[];
+}
+export interface DataTableListParams {
+    limit?: number;
+    cursor?: string;
+}
+export interface DataTableRowListParams {
+    limit?: number;
+    cursor?: string;
+    filter?: string;
+    sortBy?: string;
+    search?: string;
+}
+export interface DataTableInsertRowsParams {
+    data: Record<string, unknown>[];
+    returnType?: 'count' | 'id' | 'all';
+}
+export interface DataTableUpdateRowsParams {
+    filter: DataTableFilter;
+    data: Record<string, unknown>;
+    returnData?: boolean;
+    dryRun?: boolean;
+}
+export interface DataTableUpsertRowParams {
+    filter: DataTableFilter;
+    data: Record<string, unknown>;
+    returnData?: boolean;
+    dryRun?: boolean;
+}
+export interface DataTableDeleteRowsParams {
+    filter: string;
+    returnData?: boolean;
+    dryRun?: boolean;
+}
 //# sourceMappingURL=n8n-api.d.ts.map

dist/utils/n8n-errors.d.ts

@@ -8,7 +8,7 @@ export declare class N8nAuthenticationError extends N8nApiError {
     constructor(message?: string);
 }
 export declare class N8nNotFoundError extends N8nApiError {
-    constructor(resource: string, id?: string);
+    constructor(messageOrResource: string, id?: string);
 }
 export declare class N8nValidationError extends N8nApiError {
     constructor(message: string, details?: unknown);

dist/utils/n8n-errors.d.ts.map

@@ -1 +1 @@
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+{"version":3,"file":"n8n-errors.d.ts","sourceRoot":"","sources":["../../src/utils/n8n-errors.ts"],"names":[],"mappings":"AAIA,qBAAa,WAAY,SAAQ,KAAK;IAG3B,UAAU,CAAC,EAAE,MAAM;IACnB,IAAI,CAAC,EAAE,MAAM;IACb,OAAO,CAAC,EAAE,OAAO;gBAHxB,OAAO,EAAE,MAAM,EACR,UAAU,CAAC,EAAE,MAAM,YAAA,EACnB,IAAI,CAAC,EAAE,MAAM,YAAA,EACb,OAAO,CAAC,EAAE,OAAO,YAAA;CAK3B;AAED,qBAAa,sBAAuB,SAAQ,WAAW;gBACzC,OAAO,SAA0B;CAI9C;AAED,qBAAa,gBAAiB,SAAQ,WAAW;gBACnC,iBAAiB,EAAE,MAAM,EAAE,EAAE,CAAC,EAAE,MAAM;CAOnD;AAED,qBAAa,kBAAmB,SAAQ,WAAW;gBACrC,OAAO,EAAE,MAAM,EAAE,OAAO,CAAC,EAAE,OAAO;CAI/C;AAED,qBAAa,iBAAkB,SAAQ,WAAW;gBACpC,UAAU,CAAC,EAAE,MAAM;CAOhC;AAED,qBAAa,cAAe,SAAQ,WAAW;gBACjC,OAAO,SAA0B,EAAE,UAAU,SAAM;CAIhE;AAGD,wBAAgB,iBAAiB,CAAC,KAAK,EAAE,OAAO,GAAG,WAAW,CAuC7D;AAQD,wBAAgB,oBAAoB,CAAC,WAAW,EAAE,MAAM,EAAE,UAAU,CAAC,EAAE,MAAM,GAAG,MAAM,CAGrF;AAMD,wBAAgB,sBAAsB,IAAI,MAAM,CAE/C;AAGD,wBAAgB,2BAA2B,CAAC,KAAK,EAAE,WAAW,GAAG,MAAM,CAmBtE;AAGD,wBAAgB,WAAW,CAAC,KAAK,EAAE,WAAW,EAAE,OAAO,CAAC,EAAE,MAAM,GAAG,IAAI,CAiBtE"}

dist/utils/n8n-errors.js

@@ -25,8 +25,8 @@ class N8nAuthenticationError extends N8nApiError {
 }
 exports.N8nAuthenticationError = N8nAuthenticationError;
 class N8nNotFoundError extends N8nApiError {
-    constructor(resource, id) {
+    constructor(messageOrResource, id) {
-        const message = id ? `${resource} with ID ${id} not found` : `${resource} not found`;
+        const message = id ? `${messageOrResource} with ID ${id} not found` : messageOrResource;
         super(message, 404, 'NOT_FOUND');
         this.name = 'N8nNotFoundError';
     }
@@ -69,7 +69,7 @@ function handleN8nApiError(error) {
                 case 401:
                     return new N8nAuthenticationError(message);
                 case 404:
-                    return new N8nNotFoundError('Resource', message);
+                    return new N8nNotFoundError(message || 'Resource');
                 case 400:
                     return new N8nValidationError(message, data);
                 case 429:

dist/utils/n8n-errors.js.map

@@ -1 +1 @@
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package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "n8n-mcp",
-  "version": "2.37.3",
+  "version": "2.40.5",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "n8n-mcp",
-      "version": "2.37.3",
+      "version": "2.40.5",
       "license": "MIT",
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.27.1",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp",
-  "version": "2.40.0",
+  "version": "2.40.5",
   "description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/http-server-single-session.ts

@@ -254,6 +254,22 @@ export class SingleSessionHTTPServer {
     return Boolean(sessionId && sessionId.length > 0);
   }
 
+  /**
+   * Checks if a request body is a JSON-RPC notification (or batch of only notifications).
+   * Per JSON-RPC 2.0 §4.1, a notification is a request without an "id" member.
+   * Note: `!('id' in msg)` is strict — messages with `id: null` are treated as
+   * requests, not notifications. This is spec-compliant.
+   */
+  private isJsonRpcNotification(body: unknown): boolean {
+    if (!body || typeof body !== 'object') return false;
+    const isSingleNotification = (msg: any): boolean =>
+      msg && typeof msg.method === 'string' && !('id' in msg);
+    if (Array.isArray(body)) {
+      return body.length > 0 && body.every(isSingleNotification);
+    }
+    return isSingleNotification(body);
+  }
+  
   /**
    * Sanitize error information for client responses
    */
@@ -614,6 +630,22 @@ export class SingleSessionHTTPServer {
           logger.info('handleRequest: Reusing existing transport for session', { sessionId });
           transport = this.transports[sessionId];
 
+          // TOCTOU guard: session may have been removed between the check above and here
+          if (!transport) {
+            if (this.isJsonRpcNotification(req.body)) {
+              logger.info('handleRequest: Session removed during lookup, accepting notification', { sessionId });
+              res.status(202).end();
+              return;
+            }
+            logger.warn('handleRequest: Session removed between check and use (TOCTOU)', { sessionId });
+            res.status(400).json({
+              jsonrpc: '2.0',
+              error: { code: -32000, message: 'Bad Request: Session not found or expired' },
+              id: req.body?.id || null,
+            });
+            return;
+          }
+
           // In multi-tenant shared mode, update instance context if provided
           const isMultiTenantEnabled = process.env.ENABLE_MULTI_TENANT === 'true';
           const sessionStrategy = process.env.MULTI_TENANT_SESSION_STRATEGY || 'instance';
@@ -627,7 +659,17 @@ export class SingleSessionHTTPServer {
           this.updateSessionAccess(sessionId);
           
         } else {
-          // Invalid request - no session ID and not an initialize request
+          // Notifications are fire-and-forget; returning 400 triggers reconnection storms (#654)
+          if (this.isJsonRpcNotification(req.body)) {
+            logger.info('handleRequest: Accepting notification for stale/missing session', {
+              method: req.body?.method,
+              sessionId: sessionId || 'none',
+            });
+            res.status(202).end();
+            return;
+          }
+
+          // Only return 400 for actual requests that need a valid session
           const errorDetails = {
             hasSessionId: !!sessionId,
             isInitialize: isInitialize,

src/mcp/handlers-n8n-manager.ts

@@ -2716,7 +2716,7 @@ const createTableSchema = z.object({
   name: z.string().min(1, 'Table name cannot be empty'),
   columns: z.array(z.object({
     name: z.string().min(1, 'Column name cannot be empty'),
-    type: z.enum(['string', 'number', 'boolean', 'date', 'json']).optional(),
+    type: z.enum(['string', 'number', 'boolean', 'date']).optional(),
   })).optional(),
 });
 
@@ -2729,29 +2729,40 @@ const updateTableSchema = tableIdSchema.extend({
   name: z.string().min(1, 'New table name cannot be empty'),
 });
 
+// MCP transports may serialize JSON objects/arrays as strings.
+// Parse them back, but return the original value on failure so Zod reports a proper type error.
+function tryParseJson(val: unknown): unknown {
+  if (typeof val !== 'string') return val;
+  try { return JSON.parse(val); } catch { return val; }
+}
+
+const coerceJsonArray = z.preprocess(tryParseJson, z.array(z.record(z.unknown())));
+const coerceJsonObject = z.preprocess(tryParseJson, z.record(z.unknown()));
+const coerceJsonFilter = z.preprocess(tryParseJson, dataTableFilterSchema);
+
 const getRowsSchema = tableIdSchema.extend({
   limit: z.number().min(1).max(100).optional(),
   cursor: z.string().optional(),
-  filter: z.union([dataTableFilterSchema, z.string()]).optional(),
+  filter: z.union([coerceJsonFilter, z.string()]).optional(),
   sortBy: z.string().optional(),
   search: z.string().optional(),
 });
 
 const insertRowsSchema = tableIdSchema.extend({
-  data: z.array(z.record(z.unknown())).min(1, 'At least one row is required'),
+  data: coerceJsonArray.pipe(z.array(z.record(z.unknown())).min(1, 'At least one row is required')),
   returnType: z.enum(['count', 'id', 'all']).optional(),
 });
 
 // Shared schema for update/upsert (identical structure)
 const mutateRowsSchema = tableIdSchema.extend({
-  filter: dataTableFilterSchema,
+  filter: coerceJsonFilter,
-  data: z.record(z.unknown()),
+  data: coerceJsonObject,
   returnData: z.boolean().optional(),
   dryRun: z.boolean().optional(),
 });
 
 const deleteRowsSchema = tableIdSchema.extend({
-  filter: dataTableFilterSchema,
+  filter: coerceJsonFilter,
   returnData: z.boolean().optional(),
   dryRun: z.boolean().optional(),
 });
@@ -2823,10 +2834,13 @@ export async function handleUpdateTable(args: unknown, context?: InstanceContext
     const client = ensureApiConfigured(context);
     const { tableId, name } = updateTableSchema.parse(args);
     const dataTable = await client.updateDataTable(tableId, { name });
+    const rawArgs = args as Record<string, unknown>;
+    const hasColumns = rawArgs && typeof rawArgs === 'object' && 'columns' in rawArgs;
     return {
       success: true,
       data: dataTable,
-      message: `Data table renamed to "${dataTable.name}"`,
+      message: `Data table renamed to "${dataTable.name}"` +
+        (hasColumns ? '. Note: columns parameter was ignored — table schema is immutable after creation via the public API' : ''),
     };
   } catch (error) {
     return handleDataTableError(error);
@@ -2847,11 +2861,14 @@ export async function handleDeleteTable(args: unknown, context?: InstanceContext
 export async function handleGetRows(args: unknown, context?: InstanceContext): Promise<McpToolResponse> {
   try {
     const client = ensureApiConfigured(context);
-    const { tableId, filter, ...params } = getRowsSchema.parse(args);
+    const { tableId, filter, sortBy, ...params } = getRowsSchema.parse(args);
     const queryParams: Record<string, unknown> = { ...params };
     if (filter) {
       queryParams.filter = typeof filter === 'string' ? filter : JSON.stringify(filter);
     }
+    if (sortBy) {
+      queryParams.sortBy = sortBy;
+    }
     const result = await client.getDataTableRows(tableId, queryParams as any);
     return {
       success: true,

src/mcp/tool-docs/workflow_management/n8n-manage-datatable.ts

@@ -9,12 +9,12 @@ export const n8nManageDatatableDoc: ToolDocumentation = {
     example: 'n8n_manage_datatable({action: "createTable", name: "Contacts", columns: [{name: "email", type: "string"}]})',
     performance: 'Fast (100-500ms)',
     tips: [
-      'Table actions: createTable, listTables, getTable, updateTable, deleteTable',
+      'Table actions: createTable, listTables, getTable, updateTable (rename only), deleteTable',
       'Row actions: getRows, insertRows, updateRows, upsertRows, deleteRows',
       'Use dryRun: true to preview update/upsert/delete before applying',
       'Filter supports: eq, neq, like, ilike, gt, gte, lt, lte conditions',
       'Use returnData: true to get affected rows back from update/upsert/delete',
-      'Requires n8n enterprise or cloud with data tables feature'
+      'Requires N8N_API_URL and N8N_API_KEY configured'
     ]
   },
   full: {
@@ -22,7 +22,7 @@ export const n8nManageDatatableDoc: ToolDocumentation = {
 - **createTable**: Create a new data table with optional typed columns
 - **listTables**: List all data tables (paginated)
 - **getTable**: Get table details and column definitions by ID
-- **updateTable**: Rename an existing table
+- **updateTable**: Rename an existing table (name only — column modifications not supported via API)
 - **deleteTable**: Permanently delete a table and all its rows
 
 **Row Actions:**
@@ -42,7 +42,7 @@ export const n8nManageDatatableDoc: ToolDocumentation = {
       action: { type: 'string', required: true, description: 'Operation to perform' },
       tableId: { type: 'string', required: false, description: 'Data table ID (required for all except createTable and listTables)' },
       name: { type: 'string', required: false, description: 'For createTable/updateTable: table name' },
-      columns: { type: 'array', required: false, description: 'For createTable: column definitions [{name, type?}]. Types: string, number, boolean, date, json' },
+      columns: { type: 'array', required: false, description: 'For createTable: column definitions [{name, type?}]. Types: string, number, boolean, date' },
       data: { type: 'array|object', required: false, description: 'For insertRows: array of row objects. For updateRows/upsertRows: object with column values' },
       filter: { type: 'object', required: false, description: 'Filter: {type?: "and"|"or", filters: [{columnName, condition, value}]}' },
       limit: { type: 'number', required: false, description: 'For listTables/getRows: max results (1-100)' },
@@ -96,8 +96,6 @@ export const n8nManageDatatableDoc: ToolDocumentation = {
       'Use sortBy for deterministic row ordering',
     ],
     pitfalls: [
-      'Requires N8N_API_URL and N8N_API_KEY configured',
-      'Feature only available on n8n enterprise or cloud plans',
       'deleteTable permanently deletes all rows — cannot be undone',
       'deleteRows requires a filter — cannot delete all rows without one',
       'Column types cannot be changed after table creation via API',

src/mcp/tools-n8n-manager.ts

@@ -609,7 +609,7 @@ export const n8nManagementTools: ToolDefinition[] = [
   },
   {
     name: 'n8n_manage_datatable',
-    description: `Manage n8n data tables and rows. Actions: createTable, listTables, getTable, updateTable, deleteTable, getRows, insertRows, updateRows, upsertRows, deleteRows. Requires n8n enterprise/cloud with data tables feature.`,
+    description: `Manage n8n data tables and rows. Actions: createTable, listTables, getTable, updateTable, deleteTable, getRows, insertRows, updateRows, upsertRows, deleteRows.`,
     inputSchema: {
       type: 'object',
       properties: {
@@ -619,15 +619,15 @@ export const n8nManagementTools: ToolDefinition[] = [
           description: 'Operation to perform',
         },
         tableId: { type: 'string', description: 'Data table ID (required for all actions except createTable and listTables)' },
-        name: { type: 'string', description: 'For createTable/updateTable: table name' },
+        name: { type: 'string', description: 'For createTable: table name. For updateTable: new name (rename only — schema is immutable after creation)' },
         columns: {
           type: 'array',
-          description: 'For createTable: column definitions',
+          description: 'For createTable only: column definitions (schema is immutable after creation via public API)',
           items: {
             type: 'object',
             properties: {
               name: { type: 'string' },
-              type: { type: 'string', enum: ['string', 'number', 'boolean', 'date', 'json'] },
+              type: { type: 'string', enum: ['string', 'number', 'boolean', 'date'] },
             },
             required: ['name'],
           },

src/services/n8n-api-client.ts

@@ -637,7 +637,10 @@ export class N8nApiClient {
 
   async getDataTableRows(id: string, params: DataTableRowListParams = {}): Promise<{ data: DataTableRow[]; nextCursor?: string | null }> {
     try {
-      const response = await this.client.get(`/data-tables/${id}/rows`, { params });
+      const response = await this.client.get(`/data-tables/${id}/rows`, {
+        params,
+        paramsSerializer: (p) => this.serializeDataTableParams(p),
+      });
       return this.validateListResponse<DataTableRow>(response.data, 'data-table-rows');
     } catch (error) {
       throw handleN8nApiError(error);
@@ -673,13 +676,29 @@ export class N8nApiClient {
 
   async deleteDataTableRows(id: string, params: DataTableDeleteRowsParams): Promise<any> {
     try {
-      const response = await this.client.delete(`/data-tables/${id}/rows/delete`, { params });
+      const response = await this.client.delete(`/data-tables/${id}/rows/delete`, {
+        params,
+        paramsSerializer: (p) => this.serializeDataTableParams(p),
+      });
       return response.data;
     } catch (error) {
       throw handleN8nApiError(error);
     }
   }
 
+  /**
+   * Serializes data table query params with explicit encodeURIComponent.
+   * Axios's default serializer doesn't encode some reserved chars that n8n rejects.
+   */
+  private serializeDataTableParams(params: Record<string, any>): string {
+    const parts: string[] = [];
+    for (const [key, value] of Object.entries(params)) {
+      if (value === undefined || value === null) continue;
+      parts.push(`${encodeURIComponent(key)}=${encodeURIComponent(String(value))}`);
+    }
+    return parts.join('&');
+  }
+
   /**
    * Validates and normalizes n8n API list responses.
    * Handles both modern format {data: [], nextCursor?: string} and legacy array format.

src/services/n8n-validation.ts

@@ -1,3 +1,4 @@
+import crypto from 'crypto';
 import { z } from 'zod';
 import { WorkflowNode, WorkflowConnection, Workflow } from '../types/n8n-api';
 import { isTriggerNode, isActivatableTrigger } from '../utils/node-type-utils';
@@ -87,6 +88,22 @@ export function validateWorkflowSettings(settings: unknown): z.infer<typeof work
   return workflowSettingsSchema.parse(settings);
 }
 
+const WEBHOOK_NODE_TYPES = new Set([
+  'n8n-nodes-base.webhook',
+  'n8n-nodes-base.webhookTrigger',
+  'n8n-nodes-base.formTrigger',
+  '@n8n/n8n-nodes-langchain.chatTrigger',
+]);
+
+function ensureWebhookIds(nodes?: WorkflowNode[]): void {
+  if (!nodes) return;
+  for (const node of nodes) {
+    if (WEBHOOK_NODE_TYPES.has(node.type) && !node.webhookId) {
+      node.webhookId = crypto.randomUUID();
+    }
+  }
+}
+
 // Clean workflow data for API operations
 export function cleanWorkflowForCreate(workflow: Partial<Workflow>): Partial<Workflow> {
   const {
@@ -109,6 +126,8 @@ export function cleanWorkflowForCreate(workflow: Partial<Workflow>): Partial<Wor
     cleanedWorkflow.settings = defaultWorkflowSettings;
   }
 
+  ensureWebhookIds(cleanedWorkflow.nodes);
+
   return cleanedWorkflow;
 }
 
@@ -194,6 +213,8 @@ export function cleanWorkflowForUpdate(workflow: Workflow): Partial<Workflow> {
     cleanedWorkflow.settings = { executionOrder: 'v1' as const };
   }
 
+  ensureWebhookIds(cleanedWorkflow.nodes);
+
   return cleanedWorkflow;
 }
 

src/types/n8n-api.ts

@@ -459,13 +459,13 @@ export interface ErrorSuggestion {
 // Data Table types
 export interface DataTableColumn {
   name: string;
-  type?: 'string' | 'number' | 'boolean' | 'date' | 'json';
+  type?: 'string' | 'number' | 'boolean' | 'date';
 }
 
 export interface DataTableColumnResponse {
   id: string;
   name: string;
-  type: 'string' | 'number' | 'boolean' | 'date' | 'json';
+  type: 'string' | 'number' | 'boolean' | 'date';
   index: number;
 }
 

src/utils/n8n-errors.ts

@@ -22,8 +22,10 @@ export class N8nAuthenticationError extends N8nApiError {
 }
 
 export class N8nNotFoundError extends N8nApiError {
-  constructor(resource: string, id?: string) {
+  constructor(messageOrResource: string, id?: string) {
-    const message = id ? `${resource} with ID ${id} not found` : `${resource} not found`;
+    // If id is provided, format as "resource with ID id not found"
+    // Otherwise, use messageOrResource as-is (it's already a complete message from the API)
+    const message = id ? `${messageOrResource} with ID ${id} not found` : messageOrResource;
     super(message, 404, 'NOT_FOUND');
     this.name = 'N8nNotFoundError';
   }
@@ -70,7 +72,7 @@ export function handleN8nApiError(error: unknown): N8nApiError {
         case 401:
           return new N8nAuthenticationError(message);
         case 404:
-          return new N8nNotFoundError('Resource', message);
+          return new N8nNotFoundError(message || 'Resource');
         case 400:
           return new N8nValidationError(message, data);
         case 429:

tests/unit/http-server-session-management.test.ts

@@ -219,6 +219,7 @@ describe('HTTP Server Session Management', () => {
       status: vi.fn().mockReturnThis(),
       json: vi.fn().mockReturnThis(),
       send: vi.fn().mockReturnThis(),
+      end: vi.fn().mockReturnThis(),
       setHeader: vi.fn((key: string, value: string) => {
         headers[key.toLowerCase()] = value;
       }),
@@ -1186,4 +1187,121 @@ describe('HTTP Server Session Management', () => {
       expect(sessionInfo.age).toBeGreaterThanOrEqual(0);
     });
   });
+
+  describe('Notification handling for stale sessions (#654)', () => {
+    beforeEach(() => {
+      // Re-apply mockImplementation after vi.clearAllMocks() resets it
+      mockConsoleManager.wrapOperation.mockImplementation(async (fn: () => Promise<any>) => {
+        return await fn();
+      });
+    });
+
+    it('should return 202 for notification with stale session ID', async () => {
+      server = new SingleSessionHTTPServer();
+
+      const { req, res } = createMockReqRes();
+
+      req.headers = { 'mcp-session-id': 'stale-session-that-does-not-exist' };
+      req.method = 'POST';
+      req.body = {
+        jsonrpc: '2.0',
+        method: 'notifications/initialized',
+      };
+
+      await server.handleRequest(req as any, res as any);
+
+      expect(res.status).toHaveBeenCalledWith(202);
+      expect(res.end).toHaveBeenCalled();
+    });
+
+    it('should return 202 for notification batch with stale session ID', async () => {
+      server = new SingleSessionHTTPServer();
+
+      const { req, res } = createMockReqRes();
+
+      req.headers = { 'mcp-session-id': 'stale-session-that-does-not-exist' };
+      req.method = 'POST';
+      req.body = [
+        { jsonrpc: '2.0', method: 'notifications/initialized' },
+        { jsonrpc: '2.0', method: 'notifications/cancelled' },
+      ];
+
+      await server.handleRequest(req as any, res as any);
+
+      expect(res.status).toHaveBeenCalledWith(202);
+      expect(res.end).toHaveBeenCalled();
+    });
+
+    it('should return 400 for request (with id) with stale session ID', async () => {
+      server = new SingleSessionHTTPServer();
+
+      const { req, res } = createMockReqRes();
+      req.headers = { 'mcp-session-id': 'stale-session-that-does-not-exist' };
+      req.method = 'POST';
+      req.body = {
+        jsonrpc: '2.0',
+        method: 'tools/call',
+        params: { name: 'search_nodes', arguments: { query: 'http' } },
+        id: 42,
+      };
+
+      await server.handleRequest(req as any, res as any);
+
+      expect(res.status).toHaveBeenCalledWith(400);
+      expect(res.json).toHaveBeenCalledWith(expect.objectContaining({
+        error: expect.objectContaining({
+          message: 'Bad Request: Session not found or expired',
+        }),
+      }));
+    });
+
+    it('should return 202 for notification with no session ID', async () => {
+      server = new SingleSessionHTTPServer();
+
+      const { req, res } = createMockReqRes();
+
+      req.method = 'POST';
+      req.body = {
+        jsonrpc: '2.0',
+        method: 'notifications/cancelled',
+      };
+
+      await server.handleRequest(req as any, res as any);
+
+      expect(res.status).toHaveBeenCalledWith(202);
+      expect(res.end).toHaveBeenCalled();
+    });
+
+    it('should return 400 for request with no session ID and not initialize', async () => {
+      server = new SingleSessionHTTPServer();
+
+      const { req, res } = createMockReqRes();
+      req.method = 'POST';
+      req.body = {
+        jsonrpc: '2.0',
+        method: 'tools/list',
+        id: 1,
+      };
+
+      await server.handleRequest(req as any, res as any);
+
+      expect(res.status).toHaveBeenCalledWith(400);
+    });
+
+    it('should return 400 for mixed batch (notification + request) with stale session', async () => {
+      server = new SingleSessionHTTPServer();
+
+      const { req, res } = createMockReqRes();
+      req.headers = { 'mcp-session-id': 'stale-session-that-does-not-exist' };
+      req.method = 'POST';
+      req.body = [
+        { jsonrpc: '2.0', method: 'notifications/initialized' },
+        { jsonrpc: '2.0', method: 'tools/list', id: 1 },
+      ];
+
+      await server.handleRequest(req as any, res as any);
+
+      expect(res.status).toHaveBeenCalledWith(400);
+    });
+  });
 });

tests/unit/mcp/handlers-manage-datatable.test.ts

@@ -363,6 +363,22 @@ describe('Data Table Handlers (n8n_manage_datatable)', () => {
       expect(result.success).toBe(false);
       expect(result.error).toBe('Update failed');
     });
+
+    it('should warn when columns parameter is passed', async () => {
+      const updatedTable = { id: 'dt-1', name: 'Renamed' };
+      mockApiClient.updateDataTable.mockResolvedValue(updatedTable);
+
+      const result = await handlers.handleUpdateTable({
+        tableId: 'dt-1',
+        name: 'Renamed',
+        columns: [{ name: 'phone', type: 'string' }],
+      });
+
+      expect(result.success).toBe(true);
+      expect(result.message).toContain('columns parameter was ignored');
+      expect(result.message).toContain('immutable after creation');
+      expect(mockApiClient.updateDataTable).toHaveBeenCalledWith('dt-1', { name: 'Renamed' });
+    });
   });
 
   // ========================================================================
@@ -452,16 +468,17 @@ describe('Data Table Handlers (n8n_manage_datatable)', () => {
       });
     });
 
-    it('should pass through string filter as-is', async () => {
+    it('should pass string filter as-is', async () => {
       mockApiClient.getDataTableRows.mockResolvedValue({ data: [], nextCursor: null });
 
+      const filterStr = '{"type":"and","filters":[]}';
       await handlers.handleGetRows({
         tableId: 'dt-1',
-        filter: '{"type":"and","filters":[]}',
+        filter: filterStr,
       });
 
       expect(mockApiClient.getDataTableRows).toHaveBeenCalledWith('dt-1', {
-        filter: '{"type":"and","filters":[]}',
+        filter: filterStr,
       });
     });
   });
@@ -684,7 +701,7 @@ describe('Data Table Handlers (n8n_manage_datatable)', () => {
       });
     });
 
-    it('should serialize filter object to JSON string for API call', async () => {
+    it('should serialize filter to JSON string for API call', async () => {
       mockApiClient.deleteDataTableRows.mockResolvedValue({ deletedCount: 1 });
 
       const filter = {

tests/unit/mcp/handlers-n8n-manager.test.ts

@@ -100,6 +100,16 @@ describe('handlers-n8n-manager', () => {
       listExecutions: vi.fn(),
       deleteExecution: vi.fn(),
       healthCheck: vi.fn(),
+      createDataTable: vi.fn(),
+      listDataTables: vi.fn(),
+      getDataTable: vi.fn(),
+      updateDataTable: vi.fn(),
+      deleteDataTable: vi.fn(),
+      getDataTableRows: vi.fn(),
+      insertDataTableRows: vi.fn(),
+      updateDataTableRows: vi.fn(),
+      upsertDataTableRow: vi.fn(),
+      deleteDataTableRows: vi.fn(),
     };
 
     // Setup mock repository

tests/unit/services/n8n-api-client.test.ts

@@ -297,7 +297,7 @@ describe('N8nApiClient', () => {
         expect.fail('Should have thrown an error');
       } catch (err) {
         expect(err).toBeInstanceOf(N8nNotFoundError);
-        expect((err as N8nNotFoundError).message).toContain('not found');
+        expect((err as N8nNotFoundError).message.toLowerCase()).toContain('not found');
         expect((err as N8nNotFoundError).statusCode).toBe(404);
       }
     });
@@ -380,7 +380,7 @@ describe('N8nApiClient', () => {
         expect.fail('Should have thrown an error');
       } catch (err) {
         expect(err).toBeInstanceOf(N8nNotFoundError);
-        expect((err as N8nNotFoundError).message).toContain('not found');
+        expect((err as N8nNotFoundError).message.toLowerCase()).toContain('not found');
         expect((err as N8nNotFoundError).statusCode).toBe(404);
       }
     });
@@ -432,7 +432,7 @@ describe('N8nApiClient', () => {
         expect.fail('Should have thrown an error');
       } catch (err) {
         expect(err).toBeInstanceOf(N8nNotFoundError);
-        expect((err as N8nNotFoundError).message).toContain('not found');
+        expect((err as N8nNotFoundError).message.toLowerCase()).toContain('not found');
         expect((err as N8nNotFoundError).statusCode).toBe(404);
       }
     });
@@ -501,7 +501,7 @@ describe('N8nApiClient', () => {
         expect.fail('Should have thrown an error');
       } catch (err) {
         expect(err).toBeInstanceOf(N8nNotFoundError);
-        expect((err as N8nNotFoundError).message).toContain('not found');
+        expect((err as N8nNotFoundError).message.toLowerCase()).toContain('not found');
         expect((err as N8nNotFoundError).statusCode).toBe(404);
       }
     });
@@ -1278,7 +1278,7 @@ describe('N8nApiClient', () => {
         expect.fail('Should have thrown an error');
       } catch (err) {
         expect(err).toBeInstanceOf(N8nNotFoundError);
-        expect((err as N8nNotFoundError).message).toContain('not found');
+        expect((err as N8nNotFoundError).message.toLowerCase()).toContain('not found');
         expect((err as N8nNotFoundError).statusCode).toBe(404);
       }
     });
@@ -1491,7 +1491,7 @@ describe('N8nApiClient', () => {
       const params = { limit: 50, sortBy: 'email:asc', search: 'john' };
       const result = await client.getDataTableRows('dt-1', params);
 
-      expect(mockAxiosInstance.get).toHaveBeenCalledWith('/data-tables/dt-1/rows', { params });
+      expect(mockAxiosInstance.get).toHaveBeenCalledWith('/data-tables/dt-1/rows', expect.objectContaining({ params }));
       expect(result).toEqual(response);
     });
 
@@ -1636,7 +1636,7 @@ describe('N8nApiClient', () => {
       const params = { filter: '{"type":"and","filters":[]}', dryRun: false };
       const result = await client.deleteDataTableRows('dt-1', params);
 
-      expect(mockAxiosInstance.delete).toHaveBeenCalledWith('/data-tables/dt-1/rows/delete', { params });
+      expect(mockAxiosInstance.delete).toHaveBeenCalledWith('/data-tables/dt-1/rows/delete', expect.objectContaining({ params }));
       expect(result).toEqual(deleteResult);
     });
 

tests/unit/services/n8n-validation.test.ts

@@ -19,6 +19,14 @@ import { WorkflowBuilder } from '../../utils/builders/workflow.builder';
 import { z } from 'zod';
 import { WorkflowNode, WorkflowConnection, Workflow } from '../../../src/types/n8n-api';
 
+function webhookNode(id: string, name: string, type: string, typeVersion = 2): WorkflowNode {
+  return { id, name, type, typeVersion, position: [250, 300] as [number, number], parameters: {} };
+}
+
+function workflowWithNodes(nodes: WorkflowNode[]): Partial<Workflow> {
+  return { name: 'Test', nodes, connections: {} };
+}
+
 describe('n8n-validation', () => {
   describe('Zod Schemas', () => {
     describe('workflowNodeSchema', () => {
@@ -301,6 +309,44 @@ describe('n8n-validation', () => {
         const cleaned = cleanWorkflowForCreate(workflow as Workflow);
         expect(cleaned.settings).toEqual(customSettings);
       });
+
+      it('should inject webhookId on webhook nodes missing it', () => {
+        const workflow = workflowWithNodes([
+          webhookNode('1', 'Webhook', 'n8n-nodes-base.webhook'),
+        ]);
+
+        const cleaned = cleanWorkflowForCreate(workflow as Workflow);
+        expect(cleaned.nodes![0].webhookId).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-/);
+      });
+
+      it('should preserve existing webhookId on webhook nodes', () => {
+        const workflow = workflowWithNodes([
+          { ...webhookNode('1', 'Webhook', 'n8n-nodes-base.webhook'), webhookId: 'existing-id' },
+        ]);
+
+        const cleaned = cleanWorkflowForCreate(workflow as Workflow);
+        expect(cleaned.nodes![0].webhookId).toBe('existing-id');
+      });
+
+      it('should inject webhookId on formTrigger and chatTrigger nodes', () => {
+        const workflow = workflowWithNodes([
+          webhookNode('1', 'Form', 'n8n-nodes-base.formTrigger'),
+          webhookNode('2', 'Chat', '@n8n/n8n-nodes-langchain.chatTrigger'),
+        ]);
+
+        const cleaned = cleanWorkflowForCreate(workflow as Workflow);
+        expect(cleaned.nodes![0].webhookId).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-/);
+        expect(cleaned.nodes![1].webhookId).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-/);
+      });
+
+      it('should not inject webhookId on non-webhook nodes', () => {
+        const workflow = workflowWithNodes([
+          webhookNode('1', 'Set', 'n8n-nodes-base.set', 3.4),
+        ]);
+
+        const cleaned = cleanWorkflowForCreate(workflow as Workflow);
+        expect(cleaned.nodes![0].webhookId).toBeUndefined();
+      });
     });
 
     describe('cleanWorkflowForUpdate', () => {
@@ -533,6 +579,44 @@ describe('n8n-validation', () => {
         });
         expect(cleaned.settings).not.toHaveProperty('someOtherProperty');
       });
+
+      it('should inject webhookId on webhook nodes missing it', () => {
+        const workflow = workflowWithNodes([
+          webhookNode('1', 'Webhook', 'n8n-nodes-base.webhook'),
+        ]) as any;
+
+        const cleaned = cleanWorkflowForUpdate(workflow);
+        expect(cleaned.nodes![0].webhookId).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-/);
+      });
+
+      it('should preserve existing webhookId on webhook nodes', () => {
+        const workflow = workflowWithNodes([
+          { ...webhookNode('1', 'Webhook', 'n8n-nodes-base.webhook'), webhookId: 'existing-id' },
+        ]) as any;
+
+        const cleaned = cleanWorkflowForUpdate(workflow);
+        expect(cleaned.nodes![0].webhookId).toBe('existing-id');
+      });
+
+      it('should inject webhookId on formTrigger and chatTrigger nodes', () => {
+        const workflow = workflowWithNodes([
+          webhookNode('1', 'Form', 'n8n-nodes-base.formTrigger'),
+          webhookNode('2', 'Chat', '@n8n/n8n-nodes-langchain.chatTrigger'),
+        ]) as any;
+
+        const cleaned = cleanWorkflowForUpdate(workflow);
+        expect(cleaned.nodes![0].webhookId).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-/);
+        expect(cleaned.nodes![1].webhookId).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-/);
+      });
+
+      it('should not inject webhookId on non-webhook nodes', () => {
+        const workflow = workflowWithNodes([
+          webhookNode('1', 'Set', 'n8n-nodes-base.set', 3.4),
+        ]) as any;
+
+        const cleaned = cleanWorkflowForUpdate(workflow);
+        expect(cleaned.nodes![0].webhookId).toBeUndefined();
+      });
     });
   });