# oxify-mcp - Development TODO
**Codename:** The Ecosystem (MCP Integration)
**Status:** ✅ Phase 1-3 Completed, Phase 4-5 Remaining
**Next Phase:** Authentication & Security
---
## Phase 1: MCP Protocol Implementation ✅ COMPLETED
**Goal:** Implement Model Context Protocol (MCP) client and server.
### Current Status ✅
- [x] Basic types (McpRequest, McpResponse, McpError, ToolSchema)
- [x] McpClient trait definition
- [x] DefaultMcpClient implementation
- [x] McpServer trait definition
- [x] Server registry (McpRegistry) for managing multiple servers
### MCP Client ✅
- [x] **Stdio Transport:**
- [x] Launch MCP server as subprocess
- [x] JSON-RPC over stdio
- [x] Process lifecycle management
- [x] **HTTP Transport:**
- [x] Connect to remote MCP server
- [x] JSON-RPC over HTTP
- [ ] Authentication support (planned for Phase 4)
### MCP Server ✅
- [x] **McpServer trait:**
- [x] Tool discovery endpoint (list_tools)
- [x] Tool invocation endpoint (call_tool)
- [x] Schema generation with JSON Schema
- [x] Result formatting as JSON
---
## Phase 2: Tool Discovery & Execution ✅ COMPLETED
**Goal:** Discover and execute MCP tools.
### Tool Discovery ✅
- [x] **List Available Tools:**
- [x] Query MCP server for tools (list_tools)
- [x] Parse tool schemas (ToolSchema type)
- [x] Cache tool metadata (McpRegistry)
### Tool Execution ✅
- [x] **Invoke MCP Tools:**
- [x] Parameter validation (via JSON Schema)
- [x] Invoke tool on MCP server (call_tool)
- [x] Parse and return results (JSON values)
- [x] Error handling (McpError)
### Integration with oxify-engine ✅ COMPLETE
- [x] **Tool Node Execution:**
- [x] Execute MCP tools from workflow (via MCP_EXECUTOR global)
- [x] Pass parameters from execution context (McpConfig.parameters)
- [x] Store tool results (ExecutionResult returned to engine)
- [x] Local server registration (register_local_server)
- [x] HTTP MCP servers (automatic initialization)
- [x] HTTP fallback for backward compatibility
- [x] 11 comprehensive tests in mcp_executor.rs
---
## Phase 3: Multiple MCP Servers ✅ COMPLETED
**Goal:** Manage multiple MCP servers.
### Server Registry ✅
- [x] **Register MCP Servers:**
- [x] Server ID and connection info (McpRegistry)
- [x] Dynamic server registration/unregistration
- [x] Tool discovery across all servers
- [x] Registry statistics
- [ ] Authentication credentials (planned for Phase 4)
- [ ] Server health checks (future enhancement)
### Load Balancing ✅ COMPLETE (NEW)
- [x] **Distribute Tool Calls:**
- [x] Round-robin across servers
- [x] Least connections strategy
- [x] Random selection
- [x] Weighted round-robin based on server weights
- [x] Server affinity (sticky sessions via groups)
- [x] Failover to backup servers (invoke_tool_with_failover)
- [x] Server health tracking (Healthy/Degraded/Unhealthy)
- [x] Server metrics (request_count, error_count, avg_response_time_ms)
- [x] Tag-based server selection
---
## Phase 4: Authentication & Security ✅ COMPLETE
**Goal:** Secure MCP communication.
### Authentication ✅ COMPLETE (Updated)
- [x] **API Key Authentication:**
- [x] Pass API keys to MCP servers via headers
- [x] ApiKeyAuth with optional prefix support
- [x] Configurable header name
- [x] 14 comprehensive unit tests
- [x] **Basic Authentication:**
- [x] HTTP Basic auth (username:password)
- [x] Base64 encoding
- [x] Authorization header support
- [x] **Bearer Token Authentication:**
- [x] OAuth2-style bearer tokens
- [x] JWT token support
- [x] Authorization header support
- [x] **Custom Header Authentication:**
- [x] Arbitrary custom headers
- [x] Multiple headers support
- [x] **Credential Management:**
- [x] CredentialStore for multiple servers
- [x] AuthConfig wrapper with scopes
- [x] AuthenticatedHttpTransport
- [x] **OAuth2 Authentication:** ✅ COMPLETED
- [x] OAuth2 flow for MCP servers (client credentials, authorization code, refresh token)
- [x] Automatic token refresh with expiry tracking
- [x] PKCE support for authorization code flow
- [x] Multiple grant types (ClientCredentials, AuthorizationCode, RefreshToken)
- [x] Scope management
- [x] Comprehensive unit tests (11 OAuth2 tests)
### Sandboxing (Future)
- [ ] **Isolate MCP Tool Execution:**
- [ ] Resource limits (CPU, memory, time)
- [ ] Network restrictions
- [ ] File system restrictions
---
## Phase 5: Built-in MCP Servers ✅ COMPLETE
**Goal:** Provide useful built-in MCP servers.
### Workflow Server ✅ NEW
- [x] **Workflow Execution:**
- [x] WorkflowServer for exposing workflows as MCP tools
- [x] Auto-generate tool schemas from workflow metadata
- [x] Template variable extraction for input schema
- [x] Custom input schemas per workflow
- [x] Custom descriptions override
- [x] Pluggable executor function (WorkflowExecutor type)
- [x] Thread-safe workflow registration (Arc<RwLock>)
- [x] Configurable tool naming prefix
- [x] 11 comprehensive tests
### Filesystem Server ✅
- [x] **File Operations:**
- [x] Read file (fs_read)
- [x] Write file (fs_write)
- [x] List directory (fs_list)
- [x] Delete file/directory (fs_delete)
- [x] Check existence (fs_exists)
- [x] Security: Path sandboxing and validation
- [x] Comprehensive tests
### Web Server ✅
- [x] **Web Operations:**
- [x] HTTP GET (http_get)
- [x] HTTP POST (http_post)
- [x] Web scraping (web_scrape) - basic implementation
- [ ] Take screenshot (web_screenshot) - requires headless browser
### Git Server ✅
- [x] **Git Operations:**
- [x] Status (git_status)
- [x] Clone (git_clone)
- [x] Add (git_add)
- [x] Commit (git_commit)
- [x] Push (git_push)
- [x] Pull (git_pull)
- [x] Log (git_log)
- [x] Diff (git_diff)
- [x] Branch listing (git_branch)
- [x] Checkout (git_checkout)
### Shell Server ✅
- [x] **Shell Operations:**
- [x] Execute command (shell_exec)
- [x] Find command (shell_which)
- [x] Command whitelist for security
- [x] Environment variable support
- [x] Working directory support
- [x] Comprehensive tests
### Database Server ✅
- [x] **Fully Implemented:**
- [x] Database query (db_query) - SELECT queries with JSON results
- [x] Execute command (db_execute) - INSERT/UPDATE/DELETE with rows affected
- [x] Transaction support (db_transaction) - Atomic multi-statement execution
- [x] Table description (db_describe) - Schema information
- [x] List tables (db_tables) - Schema exploration
- [x] Read-only mode support
- [x] Type conversion for PostgreSQL types (bool, int, float, text, uuid, timestamp, json, bytea)
- [x] Connection pooling via sqlx
- [x] Comprehensive unit tests (7 tests)
---
## Phase 6: Testing & Quality ✅ MOSTLY COMPLETED
**Goal:** Comprehensive testing.
### Current Status ✅
- [x] 86 unit tests implemented and passing (updated)
- [x] Zero warnings in compilation
- [x] Comprehensive test coverage for all major components
### Completed
- [x] **Unit Tests:**
- [x] Test registry (7 tests)
- [x] Test FilesystemServer (6 tests)
- [x] Test ShellServer (7 tests)
- [x] Test WebServer (8 tests)
- [x] Test GitServer (13 tests)
- [x] Test transport layer (5 tests)
- [x] Security tests (path traversal, command whitelist, path validation)
### Remaining
- [ ] **Unit Tests:**
- [x] Test DatabaseServer (7 tests with database feature)
- [ ] **Integration Tests (Future):**
- [ ] Test with real external MCP servers
- [ ] Test stdio transport with subprocess
- [ ] Test HTTP transport with remote server
- **Note:** Current unit tests provide comprehensive coverage (75+ tests)
---
## Documentation ✅ COMPLETED
### Current Status ✅
- [x] Comprehensive inline documentation
- [x] Three working examples (basic_usage.rs, transport_example.rs, multi_server_orchestration.rs)
- [x] Comprehensive README.md with full documentation
### Completed ✅
- [x] **Code Documentation:**
- [x] All public APIs documented
- [x] Examples in doc comments
- [x] **Usage Examples:**
- [x] basic_usage.rs - demonstrates all built-in servers
- [x] transport_example.rs - demonstrates transport layer
- [x] multi_server_orchestration.rs - advanced registry usage
- [x] **README:**
- [x] MCP overview
- [x] Quick start guide
- [x] API documentation with code examples
- [x] All built-in servers documented (Filesystem, Shell, Git, Web, Database, Workflow)
- [x] Authentication guide (API key, Basic, Bearer, Custom)
- [x] Load balancing guide (strategies, failover, tags)
- [x] Custom server development guide
- [x] Integration examples
- [x] Testing guide
- [x] Contributing guidelines
---
## Integration
### oxify-engine Integration ✅ COMPLETE
- [x] **Tool Node Execution:**
- [x] Discover MCP tools (list_tools, list_all_local_tools)
- [x] Execute MCP tools from workflows (execute_tool)
- [x] Handle tool errors
- [x] Register local MCP servers (FilesystemServer, WorkflowServer, etc.)
- [x] Priority: Local servers → HTTP MCP → HTTP fallback
- [x] 9 comprehensive tests
### oxify-api Integration ✅ COMPLETE
- [x] **MCP Management API:**
- [x] List registered MCP servers (GET /api/v1/mcp/servers)
- [x] List available tools (POST /api/v1/mcp/tools)
- [x] Test tool execution (POST /api/v1/mcp/tools/invoke)
- [x] Registry statistics (GET /api/v1/mcp/stats)
- [x] Server registration/unregistration endpoints
- [x] 10 comprehensive unit tests in mcp_handlers.rs
---
## License
MIT OR Apache-2.0
---
## Summary of Progress
### ✅ Completed (Phases 1-3, 5)
1. **Core MCP Implementation**
- Full MCP protocol support (client, server, transport)
- DefaultMcpClient with HTTP and Stdio transports
- McpServer trait for building custom servers
- Comprehensive error handling
2. **Server Registry**
- McpRegistry for managing multiple servers
- Dynamic server registration/unregistration
- Tool discovery across all servers
- Registry statistics and search
3. **Built-in Servers**
- FilesystemServer (5 tools) ✅
- ShellServer (2 tools) ✅
- GitServer (10 tools) ✅
- WebServer (4 tools, 1 pending) ⚠️
- DatabaseServer (5 tools - PostgreSQL) ✅
- WorkflowServer (dynamic tools) ✅
4. **Testing**
- 86 unit tests passing
- Zero compilation warnings
- Comprehensive test coverage:
- Registry (7 tests)
- FilesystemServer (6 tests)
- ShellServer (7 tests)
- WebServer (8 tests)
- GitServer (13 tests)
- DatabaseServer (7 tests)
- WorkflowServer (11 tests)
- Transport layer (5 tests)
- Authentication (14 tests)
- OAuth2 (11 tests)
5. **Examples**
- basic_usage.rs - Complete walkthrough of all built-in servers
- transport_example.rs - Transport layer demonstration
- multi_server_orchestration.rs - Advanced registry usage
- api_integration.rs - Integration with oxify-api MCP endpoints
6. **Security Enhancements**
- Response size limits (10MB default)
- Request/response validation
- Path traversal prevention
- Command whitelist enforcement
- Timeout handling (30s default for HTTP)
7. **Authentication (NEW)****
- API Key, Basic, Bearer, Custom Header auth methods
- AuthenticatedHttpTransport for secure connections
- CredentialStore for multi-server credentials
- 14 comprehensive unit tests
8. **Load Balancing (NEW)****
- Round-robin, Least Connections, Random, Weighted strategies
- Server health tracking (Healthy/Degraded/Unhealthy)
- Server metrics (request/error counts, response times)
- Failover support with invoke_tool_with_failover
- Group-based and tag-based server selection
### 🚧 In Progress / Remaining
1. **Phase 6: Integration Testing (Future)**
- Integration tests with external MCP servers
- End-to-end workflow tests
2. **Remaining Features (Future)**
- Advanced resource limits and sandboxing
- WebSocket transport support
---
**Last Updated:** 2026-01-08
**Document Version:** 4.3
**Status:** Production Ready - All Core Features Complete + oxify-api Integration
**Test Status:** ✅ 86 tests passing, 0 warnings
**Code Coverage:** Registry, All Servers (Filesystem, Shell, Web, Git, Database, Workflow), Transport Layer, Auth (including OAuth2), oxify-api Integration (10 tests)