**Issue #654 (critical):** handleRequest() returned HTTP 400 for JSON-RPC
notifications with stale/expired session IDs. Per JSON-RPC 2.0 spec,
notifications don't expect responses. Returning 400 caused Claude's proxy
to interpret the connection as broken, triggering reconnection storms
(930 errors/day, 216 users affected).
Fix: Added isJsonRpcNotification() helper that detects single and batch
notifications (messages with method but no id field). Path C in
handleRequest() now returns 202 Accepted for notifications with stale
sessions instead of 400. Also added TOCTOU null guard in Path B.
**Issue 1 (medium):** updateTable silently accepted columns parameter
via the shared MCP tool schema. Zod stripped it but gave no feedback.
Fix: handleUpdateTable now detects columns in raw args and appends a
warning to the response. Tool schema descriptions clarified that columns
are for createTable only and schema is immutable after creation.
Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* feat: add n8n_create_data_table MCP tool and projectId for create workflow (#640)
Add new MCP tool to create n8n data tables via the REST API:
- n8n_create_data_table tool definition with name + columns schema
- handleCreateDataTable handler with Zod validation and N8nApiError handling
- N8nApiClient.createDataTable() calling POST /data-tables
- DataTable, DataTableColumn, DataTableColumnResponse types per OpenAPI spec
- Column types: string | number | boolean | date | json
- Input validation: .min(1) on table name and column names
- Tool documentation with examples, use cases, and pitfalls
Also adds projectId parameter to n8n_create_workflow for enterprise
project support, and fixes stale management tool count in health check.
Based on work by @djakielski in PR #646.
Co-Authored-By: Dominik Jakielski <dominik.jakielski@urlaubsguru.de>
Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* feat: replace n8n_create_data_table with n8n_manage_datatable (10 actions)
Replaces the single-purpose n8n_create_data_table tool with a comprehensive
n8n_manage_datatable tool covering all 10 n8n data table API endpoints:
Table operations: createTable, listTables, getTable, updateTable, deleteTable
Row operations: getRows, insertRows, updateRows, upsertRows, deleteRows
- Filter system with and/or logic and 8 condition operators
- Dry-run support for updateRows, upsertRows, deleteRows
- Pagination, sorting, and full-text search for row listing
- 9 new N8nApiClient methods for all data table endpoints
- Shared error handler and consolidated Zod schemas
- Comprehensive tool documentation with examples per action
- 36 handler tests + 18 API client tests
BREAKING: n8n_create_data_table removed. Use n8n_manage_datatable with
action="createTable" instead.
Based on work by @djakielski in PR #646.
Co-Authored-By: Dominik Jakielski <dominik.jakielski@urlaubsguru.de>
Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
