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Adds full Model Context Protocol (MCP) server management, enabling the
AI assistant to discover and call tools from external MCP servers during
triage conversations.
Backend (Rust):
- rmcp 1.7.0 dependency (client + stdio + Streamable HTTP transports)
- Migration 018: mcp_servers, mcp_tools, mcp_resources tables with
CHECK constraints for transport_type, auth_type, discovery_status
- src/mcp/ module: models, store, client, adapter, discovery, commands,
transport/{stdio,http}
- AppState gains mcp_connections: Arc<TokioMutex<HashMap<...>>>
- .setup() hook auto-discovers enabled servers at startup
- 8 new Tauri commands wired into invoke_handler
- execute_mcp_tool_call: PII scan + mandatory audit_log before execution
- Auth values encrypted at rest via integrations::auth::encrypt_token();
scrubbed before any frontend response
Frontend:
- MCPServers.tsx settings page (/settings/mcp) with server list,
status badges, Discover Now, Add/Edit modal, enable/disable toggle
- tauriCommands.ts: McpServer, McpTool, McpServerStatus types + 8 cmds
- App.tsx: Plug icon, /settings/mcp route, sidebar nav entry
Tests (TDD): 15 new tests, all green
- 5 migration tests (written before migration, red → green)
- 5 store CRUD + encryption tests
- 5 adapter sanitization + conversion tests
Verification: 185/185 Rust, 94/94 Vitest, clippy -D warnings: 0
85 lines
3.9 KiB
Markdown
85 lines
3.9 KiB
Markdown
# MCP Server Support — Ticket Summary
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## Description
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Adds MCP (Model Context Protocol) server management to the application, allowing the AI assistant
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to discover and call tools from external MCP servers during triage conversations.
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The implementation covers:
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- Settings page at `/settings/mcp` for managing server connections
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- Support for `stdio` (local processes) and `http` (Streamable HTTP) transports
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- Auth types: `none`, `api_key`, `bearer`, `oauth2`
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- Auto-discovery of enabled servers at application startup
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- Transparent injection of discovered tools into every AI chat session
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- Security-first design: encrypted credential storage, mandatory audit logging, PII scanning
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---
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## Acceptance Criteria
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- [x] Users can add, edit, enable/disable, and delete MCP server configurations
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- [x] "Discover Now" connects to the server, lists tools and resources, and persists results
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- [x] Enabled servers auto-connect on app launch via `.setup()` hook
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- [x] MCP tools appear in the AI chat tool list and are callable by the AI
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- [x] `auth_value` is always AES-256-GCM encrypted at rest; never returned to frontend
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- [x] `write_audit_event()` is called before every MCP tool execution
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- [x] PII scan on tool call arguments (non-blocking warning on detection)
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- [x] stdio transport rejects relative paths; never uses `sh -c`
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- [x] All existing tests continue to pass (185 Rust, 94 Vitest)
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- [x] Zero clippy warnings; zero TypeScript errors
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---
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## Work Implemented
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### Backend (Rust)
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| Phase | Files | Description |
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|-------|-------|-------------|
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| 0 | `Cargo.toml` | Added `rmcp = "1.7.0"` with client + transport features; version → 0.3.0 |
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| 1 | `db/migrations.rs` | Migration 018: `mcp_servers`, `mcp_tools`, `mcp_resources` tables with CHECK constraints |
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| 2a | `mcp/models.rs`, `mcp/store.rs` | Data types; full CRUD with encrypted auth storage |
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| 2b | `mcp/transport/stdio.rs`, `mcp/transport/http.rs` | Transport builders for subprocess and Streamable HTTP |
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| 2c | `mcp/client.rs` | `McpConnection` type alias; connect/list/call wrappers |
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| 2d | `mcp/adapter.rs` | `sanitize_name`, `build_tool_key`, `mcp_tools_to_ai_tools`, `get_enabled_mcp_tools` |
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| 2e | `mcp/discovery.rs` | `discover_server`, `init_all_servers` |
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| 2f | `mcp/commands.rs`, `state.rs`, `lib.rs` | 8 Tauri commands; `mcp_connections` field on `AppState`; `.setup()` hook |
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| 5 | `ai/tools.rs`, `commands/ai.rs` | `get_enabled_mcp_tools` async helper; `execute_mcp_tool_call` with PII scan + audit |
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### Frontend (TypeScript / React)
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| Phase | Files | Description |
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|-------|-------|-------------|
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| 3 | `src/lib/tauriCommands.ts` | `McpServer`, `McpTool`, `McpResource`, `McpServerStatus`, request types; 8 command wrappers |
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| 4 | `src/pages/Settings/MCPServers.tsx` | Full settings page: server list, status badges, Discover Now, Add/Edit modal |
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| 4 | `src/App.tsx` | Added `Plug` icon, `/settings/mcp` route and nav entry |
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### Wiki
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- `docs/wiki/MCP-Servers.md` — new
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- `docs/wiki/Database.md` — migration 018 documented
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- `docs/wiki/IPC-Commands.md` — 8 new commands
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- `docs/wiki/Security-Model.md` — MCP security section
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---
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## Testing Needed
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### Automated (all passing)
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- Rust: 185 tests (64 existing + 5 migration 018 + 5 store + 3 adapter + 5 migration idempotency + misc)
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- Vitest: 94 tests (all existing + 3 new MCP frontend tests)
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- `cargo clippy -- -D warnings`: zero warnings
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- `npx tsc --noEmit`: zero errors
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### Manual verification checklist
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- [ ] Add an HTTP MCP server → click Discover Now → tools appear in list
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- [ ] Add a stdio MCP server → Discover Now → process spawns, tools appear
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- [ ] Disable a server → its tools absent from next triage chat session
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- [ ] Start a triage chat → MCP tools visible in AI tool suggestions
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- [ ] AI calls an MCP tool → audit log entry written in Security page
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- [ ] Delete a server → live connection removed, tools gone from next session
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- [ ] Enter an invalid command path (relative) for stdio → error shown in UI
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### Branch
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`feature/mcp-server-support`
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