* feat: Add session persistence API for zero-downtime deployments (v2.24.1)
Implements export/restore functionality for MCP sessions to support container
restarts without losing user sessions. This enables zero-downtime deployments
for multi-tenant platforms and Kubernetes/Docker environments.
New Features:
- exportSessionState() - Export active sessions to JSON
- restoreSessionState() - Restore sessions from exported data
- SessionState type - Serializable session structure
- Comprehensive test suite (22 tests, 100% passing)
Implementation Details:
- Only exports sessions with valid n8nApiUrl and n8nApiKey
- Automatically filters expired sessions (respects sessionTimeout)
- Validates context structure using existing validation
- Handles null/invalid sessions gracefully with warnings
- Enforces MAX_SESSIONS limit during restore (100 sessions)
- Dormant sessions recreate transport/server on first request
Files Modified:
- src/http-server-single-session.ts: Core export/restore logic
- src/mcp-engine.ts: Public API wrapper methods
- src/types/session-state.ts: Type definitions
- tests/: Comprehensive unit tests
Security Note:
Session data contains plaintext n8n API keys. Downstream applications
MUST encrypt session data before persisting to disk.
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Co-Authored-By: Claude <noreply@anthropic.com>
Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en
* feat: implement 7 critical session persistence API fixes for production readiness
This commit implements all 7 critical fixes identified in the code review
to make the session persistence API production-ready for zero-downtime
container deployments in multi-tenant environments.
Fixes implemented:
1. Made instanceId optional in SessionState interface
2. Removed redundant validation, properly using validateInstanceContext()
3. Fixed race condition in MAX_SESSIONS check using real-time count
4. Added comprehensive security logging with logSecurityEvent() helper
5. Added duplicate session ID detection during export with Set tracking
6. Added date parsing validation with isNaN checks for Invalid Date objects
7. Restructured null checks for proper TypeScript type narrowing
Changes:
- src/types/session-state.ts: Made instanceId optional
- src/http-server-single-session.ts: Implemented all validation and security fixes
- tests/unit/http-server/session-persistence.test.ts: Fixed MAX_SESSIONS test
All 13 session persistence unit tests passing.
All 9 MCP engine session persistence tests passing.
Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
---------
Co-authored-by: Claude <noreply@anthropic.com>
* docs: Update CLAUDE.md with development notes
* chore: update n8n to v1.116.2
- Updated n8n from 1.115.2 to 1.116.2
- Updated n8n-core from 1.114.0 to 1.115.1
- Updated n8n-workflow from 1.112.0 to 1.113.0
- Updated @n8n/n8n-nodes-langchain from 1.114.1 to 1.115.1
- Rebuilt node database with 542 nodes
- Updated version to 2.20.7
- Updated n8n version badge in README
- All changes will be validated in CI with full test suite
Conceived by Romuald Członkowski - www.aiadvisors.pl/en
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Co-Authored-By: Claude <noreply@anthropic.com>
* fix: regenerate package-lock.json to sync with updated dependencies
Fixes CI failure caused by package-lock.json being out of sync with
the updated n8n dependencies.
- Regenerated with npm install to ensure all dependency versions match
- Resolves "npm ci" sync errors in CI pipeline
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* fix: align FTS5 tests with production boosting logic
Tests were failing because they used raw FTS5 ranking instead of the
exact-match boosting logic that production uses. Updated both test files
to replicate production search behavior from src/mcp/server.ts.
- Updated node-fts5-search.test.ts to use production boosting
- Updated database-population.test.ts to use production boosting
- Both tests now use JOIN + CASE statement for exact-match prioritization
This makes tests more accurate and less brittle to FTS5 ranking changes.
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Co-Authored-By: Claude <noreply@anthropic.com>
* fix: prioritize exact matches in FTS5 search with case-insensitive comparison
Root cause: SQL ORDER BY was sorting by FTS5 rank first, then CASE statement.
Since ranks are unique, the CASE boosting never applied. Additionally, the
CASE statement used case-sensitive comparison which failed to match nodes
like "Webhook" when searching for "webhook".
Changes:
- Changed ORDER BY from "rank, CASE" to "CASE, rank" in production code
- Added LOWER() for case-insensitive exact match detection
- Updated both test files to match the corrected SQL logic
- Exact matches now consistently rank first regardless of FTS5 score
Impact:
- Improves search quality by ensuring exact matches appear first
- More efficient SQL (less JavaScript sorting needed)
- Tests now accurately validate production search behavior
- Fixes 2/705 failing integration tests
Verified:
- Both tests pass locally after fix
- SQL query tested with SQLite CLI showing webhook ranks 1st
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* docs: update CHANGELOG with FTS5 search fix details
Added comprehensive documentation for the FTS5 search ranking bug fix:
- Problem description with SQL examples showing wrong ORDER BY
- Root cause analysis explaining why CASE statement never applied
- Case-sensitivity issue details
- Complete fix description for production code and tests
- Impact section covering search quality, performance, and testing
- Verified search results showing exact matches ranking first
This documents the critical bug fix that ensures exact matches
appear first in search results (webhook, http, code, etc.) with
case-insensitive matching.
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---------
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- Document new fuzzy matching capability for template discovery
- Describes 50% reduction in failed queries
- Lists key features and improvements
- Uses factual, technical language
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Co-Authored-By: Claude <noreply@anthropic.com>
- Fix type safety vulnerability in enhanced-config-validator.ts
- Added proper type checking before string operations
- Return early when nodeType is invalid instead of using empty string
- Improve error handling robustness in MCP server
- Wrapped validation in try-catch to handle unexpected errors
- Properly re-throw ValidationError instances
- Add user-friendly error messages for internal errors
- Write comprehensive CHANGELOG entry for v2.10.3
- Document fixes for issues #58, #68, #70, #73
- Detail new validation system features
- List all enhancements and test coverage
Addressed HIGH priority issues from code review:
- Type safety holes in config validator
- Missing error handling for validation system failures
- Consistent error types across validation tools
- Updated version in package.json and package.runtime.json
- Updated version badge in README.md
- Added comprehensive changelog entry for v2.8.3
- Fixed TypeScript lint errors in test files by making env vars optional
- Fixed edge-cases test to include required NODE_ENV
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Major improvements based on comprehensive test suite review:
Test Fixes:
- Fix all 78 failing tests across logger, MSW, and validator tests
- Fix console spy management in logger tests with proper DEBUG env handling
- Fix MSW test environment restoration in session-management.test.ts
- Fix workflow validator tests by adding proper node connections
- Fix mock setup issues in edge case tests
Test Organization:
- Split large config-validator.test.ts (1,075 lines) into 4 focused files
- Rename 63+ tests to follow "should X when Y" naming convention
- Add comprehensive edge case test files for all major validators
- Create tests/README.md with testing guidelines and best practices
New Features:
- Add ConfigValidator.validateBatch() method for bulk validation
- Add edge case coverage for null/undefined, boundaries, invalid data
- Add CI-aware performance test timeouts
- Add JSDoc comments to test utilities and factories
- Add workflow duplicate node name validation tests
Results:
- All tests passing: 1,356 passed, 19 skipped
- Test coverage: 85.34% statements, 85.3% branches
- From 78 failures to 0 failures
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Co-Authored-By: Claude <noreply@anthropic.com>
- Update testing-architecture.md with accurate test counts (1,182 tests)
- Document 933 unit tests and 249 integration tests
- Add real code examples and directory structure
- Include lessons learned and common issues/solutions
- Update README.md testing section with comprehensive test overview
- Include test distribution by component
- Add CI test results from run #41
- Update CLAUDE.md with latest development guidance
- Fix N8nRateLimitError constructor call (takes only retryAfter parameter)
- Fix optional chaining for result.details access
- Mock NodeRepository correctly instead of trying to instantiate it
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- Fixed health check to use correct /healthz endpoint instead of /health
- Added MCP version (mcpVersion) and supported n8n version (supportedN8nVersion) to health check response
- Added versionNote field with instructions for AI agents about manual version verification
- n8n API limitation: instance version cannot be determined automatically
- Updated axios usage for healthz endpoint access with proper error handling
- Added specific error reasons for auth failures: no_auth_header, invalid_auth_format, invalid_token
- Fixed AUTH_TOKEN_FILE support in Docker production stacks (issue #16)
- Added AUTH_TOKEN_FILE support to single-session HTTP server for consistency
- Enhanced security by removing token lengths from logs
- Added token trimming and empty token validation
- Updated Docker entrypoint to properly support AUTH_TOKEN_FILE
- Bumped version to 2.7.10
This improves debugging for mcp-remote authentication issues and enables
proper Docker secrets usage in production environments.
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Co-Authored-By: Claude <noreply@anthropic.com>
- Add bin configuration to package.json for npx execution
- Implement smart database path resolution for npx/global/local installs
- Create dedicated npm publish script using runtime-only dependencies
- Add .npmignore to control published package contents
- Update README with npx as primary installation method
- Add n8n version badge to README
- Sync version between package.json and package.runtime.json
- Update CHANGELOG for v2.7.8 release
This allows users to run 'npx n8n-mcp' without installing the package,
reducing friction and making it easier to get started with n8n-MCP.
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Co-Authored-By: Claude <noreply@anthropic.com>
- Add TRUST_PROXY environment variable to enable proxy header trust
- Configure Express trust proxy in both HTTP server implementations
- Fix issue #19: Docker internal IPs logged instead of real client IPs
- Update documentation with reverse proxy configuration guide
- Add examples for nginx proxy header forwarding
- Maintain backward compatibility (disabled by default)
When TRUST_PROXY=1 is set, the server will correctly log client IPs
from X-Forwarded-For headers instead of proxy/container IPs.
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Co-Authored-By: Claude <noreply@anthropic.com>
- Add AUTH_TOKEN_FILE environment variable support for reading auth tokens from files
- Support Docker secrets pattern for production deployments
- Add Known Issues section documenting Claude Desktop container duplication bug
- Update documentation with authentication options and best practices
- Fix issue #16: AUTH_TOKEN_FILE was documented but not implemented
- Add comprehensive tests for AUTH_TOKEN_FILE functionality
BREAKING CHANGE: None - AUTH_TOKEN continues to work as before
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Co-Authored-By: Claude <noreply@anthropic.com>
- Renamed start_here_workflow_guide to tools_documentation for clarity
- Added depth parameter to control documentation detail (essentials/full)
- Converted output from JSON to LLM-friendly plain text format
- Added per-tool documentation capability
- Created two-tier documentation system:
- Essentials: brief info with key parameters and tips
- Full: comprehensive docs with examples and best practices
- Documented 8 commonly used MCP tools
- Removed 380+ lines of unused getWorkflowGuide method
- Fixed duplicate tool definitions
- Updated all documentation references
- Added test script for tools documentation
BREAKING CHANGE: start_here_workflow_guide renamed to tools_documentation
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Co-Authored-By: Claude <noreply@anthropic.com>
- Removed ~965MB of temporary directories (temp/, extracted-nodes/, etc)
- Deleted outdated database files and backups (.bak files)
- Removed legacy shell scripts (mcp-server-v20.sh, rebuild-v20.sh)
- Cleaned up orphan test files and debugging scripts
- Removed duplicate schema file (src/db/schema.sql)
- Deleted old Dockerfile.old and empty database files
- Updated documentation structure in README.md
- Added n8n_diagnostic tool to documentation
- Condensed version history in CLAUDE.md
- Created release notes for v2.7.0
Total impact: Removed 34 files, saving ~965MB+ of disk space
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BREAKING CHANGES:
- Renamed n8n_update_workflow to n8n_update_full_workflow for clarity
NEW FEATURES:
- Added n8n_update_partial_workflow tool for diff-based workflow editing
- Implemented WorkflowDiffEngine with 13 operation types
- Added transactional updates with two-pass processing
- Maximum 5 operations per request for reliability
- Operations can be in any order - engine handles dependencies
- Added validateOnly mode for testing changes before applying
- 80-90% token savings by only sending changes
IMPROVEMENTS:
- Enhanced tool description with comprehensive parameter documentation
- Added clear examples for simple and complex use cases
- Improved error messages and validation
- Added extensive test coverage for all operations
DOCUMENTATION:
- Added workflow-diff-examples.md with usage patterns
- Added transactional-updates-example.md showing before/after
- Updated README.md with v2.7.0 features
- Updated CLAUDE.md with latest changes
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- NEW: n8n_validate_workflow tool to validate workflows from n8n instance by ID
- Fetches workflow via API and runs comprehensive validation
- Uses existing WorkflowValidator for consistency
- Supports all validation profiles and options
- Updated start_here tool with new workflow lifecycle info
- Updated README with new tool documentation
- Updated Claude Project Setup instructions
This completes the workflow lifecycle management:
discover → build → validate → deploy → execute → monitor
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Add node type existence validation that catches invalid types
- Fix critical issue: now catches 'nodes-base.webhook' BEFORE database lookup
- Add smart suggestions for common mistakes (webhook → n8n-nodes-base.webhook)
- Add minimum viable workflow validation (prevents single-node workflows)
- Add empty connection detection for multi-node workflows
- Add helper functions for workflow structure examples and fix suggestions
- Prevent AI agents from creating workflows with question mark nodes
This fixes the exact issue where workflows created with 'nodes-base.webhook'
would show as broken (question marks) in the n8n UI.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Enhanced workflow validator to enforce typeVersion on versioned nodes
- Returns errors for missing typeVersion with suggested version to add
- Warns about outdated typeVersion values
- Prevents invalid typeVersion (zero, negative, or exceeding maximum)
- Added comprehensive test script for typeVersion validation
- Helps AI agents avoid common workflow creation mistakes
This ensures workflows always use compatible node versions before deployment.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Update n8n version from v1.97.1 to v1.99.1 in README
- Fix 7 broken documentation links to point to existing files
- Standardize Docker image size to ~280MB across all docs (was inconsistent: 150MB/200MB/283MB)
- Add missing npm scripts for test commands (test:essentials, test:enhanced-validation, etc.)
- Update CHANGELOG.md with missing versions 2.4.0 through 2.5.1
- Update README_CLAUDE_SETUP.md to list all 21+ MCP tools (was only showing 6)
- Document 5 additional npm scripts in CLAUDE.md
- Update AI-capable nodes count to 263 (was 35 in old docs)
All documentation now accurately reflects the current codebase state.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Update tool descriptions to clarify ANY node can be used as AI tool
- Add get_node_as_tool_info to available tools in README
- Enhance workflow validation tool descriptions for AI connections
- Update README with v2.5.1 release notes
- Remove redundant _General__Scrape_with_HTTP_tool.json file
- Bump version to 2.5.1 in package.json
The key insight: ANY n8n node can be connected to an AI Agent's tool
port, not just those marked with usableAsTool=true. This update makes
that clear throughout the documentation and tool descriptions.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
Phase 2 Professional Validation Features:
1. Validation Profiles:
- minimal: Only required fields
- runtime: Critical errors + security warnings
- ai-friendly: Balanced (default)
- strict: All checks + best practices
2. New Node Validators:
- Webhook: Path validation, response modes, auth warnings
- PostgreSQL: SQL injection detection, query safety
- MySQL: Similar to Postgres with MySQL-specific checks
3. New Tools:
- validate_node_minimal: Lightning-fast required field checking
- Updated validate_node_operation with profile support
4. SQL Safety Features:
- Detects template expressions vulnerable to injection
- Warns about DELETE/UPDATE without WHERE
- Catches dangerous operations (DROP, TRUNCATE)
- Suggests parameterized queries
5. Enhanced Coverage:
- Now supports 7+ major nodes with specific validators
- Flexible validation based on use case
- Professional-grade safety checks
This completes the major validation system overhaul from the original plan.
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- Add validate_node_operation tool with 80%+ fewer false positives
- Remove deprecated validate_node_config tool
- Add EnhancedConfigValidator with operation context filtering
- Add node-specific validators for Slack, Google Sheets, OpenAI, MongoDB
- Integrate working examples in validation responses
- Add actionable next steps and auto-fix suggestions
- Test shows Slack validation reduced from 45 errors to 1 error\!
BREAKING CHANGE: validate_node_config removed in favor of validate_node_operation
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- Add 4 new MCP tools for workflow templates
- Integrate with n8n.io API to fetch community templates
- Filter templates to last 6 months only
- Store templates in SQLite with full workflow JSON
- Manual fetch system (not part of regular rebuild)
- Support search by nodes, keywords, and task categories
- Add fetch:templates and test:templates npm scripts
- Update to v2.4.1
🤖 Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>
Major optimization that reduces Docker image size by 87% and build time by 10x:
- Remove ALL n8n dependencies from runtime Docker image
- Add package.runtime.json with only 5 essential runtime deps
- Optimize Dockerfile to build TypeScript without n8n packages
- Add BuildKit optimizations with cache mounts
- Update documentation to highlight the improvements
Results:
- Image size: ~1.5GB → ~200MB (87% reduction)
- Build time: ~12 minutes → ~1-2 minutes
- No n8n version conflicts at runtime
- Better security with minimal attack surface
The key insight is that since we always rebuild the database locally
before deployment, the Docker runtime never needs n8n packages.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Changed from Sustainable Use License to MIT License
- Added attribution to Romuald Czlonkowski @ www.aiadvisors.pl/en
- Created ATTRIBUTION.md with easy attribution examples
- Updated package.json, README.md, and CLAUDE.md
- Added GitHub stars badge to encourage community support
- Bumped version to 2.4.0 to mark this significant change
This change allows:
✅ Unrestricted use in personal and commercial projects
✅ Easy integration into corporate environments
✅ Freedom to modify and distribute
✅ Hosting as a service without restrictions
The project remains focused on helping n8n builders work more efficiently.
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- Add get_node_essentials tool for 10-20 essential properties only
- Add search_node_properties for targeted property search
- Add get_node_for_task with 14 pre-configured templates
- Add validate_node_config for comprehensive validation
- Add get_property_dependencies for visibility analysis
- Implement PropertyFilter service with curated essentials
- Implement ExampleGenerator with working examples
- Implement TaskTemplates for common workflows
- Implement ConfigValidator with security checks
- Implement PropertyDependencies for dependency analysis
- Enhance property descriptions to 100% coverage
- Add version information to essentials response
- Update documentation with new tools
Response sizes reduced from 100KB+ to <5KB for better AI agent usability.
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Co-Authored-By: Claude <noreply@anthropic.com>
- Updated CLAUDE.md with v2.3.3 achievements and metrics
- Updated README.md with new node counts and v2.3.3 features
- Added comprehensive CHANGELOG.md entry for v2.3.3
- Bumped version in package.json to 2.3.3
Key updates:
- Documented automated dependency update system
- Updated metrics: 525 nodes, 263 AI tools, 99% property coverage
- Noted successful update to n8n v1.97.1
- Documented validation script fixes
Root Cause Analysis:
- Express.json() middleware was consuming request stream before StreamableHTTPServerTransport
- StreamableHTTPServerTransport has initialization issues with stateless usage
Two-Phase Solution:
1. Removed all body parsing middleware to preserve raw streams
2. Created http-server-fixed.ts with direct JSON-RPC implementation
Key Changes:
- Remove express.json() from all HTTP server implementations
- Add http-server-fixed.ts that bypasses StreamableHTTPServerTransport
- Implement initialize, tools/list, and tools/call methods directly
- Add USE_FIXED_HTTP=true environment variable to enable fixed server
- Update logging to not access req.body
The fixed implementation:
- Handles JSON-RPC protocol directly without transport complications
- Maintains full MCP compatibility
- Works reliably without stream or initialization errors
- Provides better performance and debugging capabilities
Usage: MCP_MODE=http USE_FIXED_HTTP=true npm start
This provides a stable, production-ready HTTP server for n8n-MCP.
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- Add ConsoleManager to prevent console output interference with StreamableHTTPServerTransport
- Implement SingleSessionHTTPServer with persistent session reuse
- Create N8NMCPEngine for clean service integration
- Add automatic session expiry after 30 minutes of inactivity
- Update logger to be HTTP-aware during active requests
- Maintain backward compatibility with existing deployments
This fixes the "stream is not readable" error by implementing the Hybrid
Single-Session architecture as documented in MCP_ERROR_FIX_PLAN.md
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Co-Authored-By: Claude <noreply@anthropic.com>
- Rename Dockerfile.optimized to Dockerfile (now the default)
- Keep old Dockerfile as Dockerfile.old for reference
- Update GitHub Actions to use default Dockerfile
- Remove build-full job - only one image variant now
- Remove docker-compose.optimized.yml and other variants
- Update all documentation to reflect single image approach
The optimized 283MB image is now the only n8n-MCP Docker image.
This simplifies the user experience and provides the best solution
for all use cases.
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- Add optimized database schema with embedded source code storage
- Create optimized rebuild script that extracts source at build time
- Implement optimized MCP server reading from pre-built database
- Add Dockerfile.optimized with multi-stage build process
- Create comprehensive documentation and testing scripts
- Demonstrate 92% size reduction by removing runtime n8n dependencies
The optimization works by:
1. Building complete database at Docker build time
2. Extracting all node source code into the database
3. Creating minimal runtime image without n8n packages
4. Serving everything from pre-built SQLite database
This makes n8n-MCP suitable for resource-constrained production deployments.
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- Document the dual-adapter system (better-sqlite3 and sql.js)
- Add technical decisions and implementation details
- Include problem/solution documentation for SQLite version mismatch
- Update architecture diagram with database-adapter.ts
- Add performance considerations and memory notes
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- Updated CLAUDE.md with complete project state and capabilities
- Enhanced README.md with node extraction features and examples
- Added CHANGELOG.md to track version history
- Documented new MCP tools and resources for node source extraction
- Added special features section highlighting AI Agent capabilities
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