abp-mcp

# abp-mcp [](https://github.com/tekthar/abp-mcp/actions/workflows/ci.yml) [](https://www.nuget.org/packages/AbpMcp) [](https://github.com/tekthar/abp-mcp/blob/main/LICENSE) > Auto-generate a Model Context Protocol (MCP) server from your ABP Framework application. > One NuGet, one line, and every `[McpTool]`-tagged Application Service is reachable by Claude, Cursor, and every MCP-compatible agent. > In-process. Permission-aware. Tenancy-aware — agent calls flow through ABP's normal `ICurrentTenant` pipeline, so a token issued for a tenant calls into that tenant's data. ```mermaid sequenceDiagram autonumber participant Agent as 🤖 Claude / Cursor / any MCP client participant MCP as /mcp endpoint<br/>(in-process) participant Service as Your <code>IApplicationService</code><br/>(BookAppService, etc.) participant DB as 💾 EF Core / your data store Agent->>MCP: tools/list MCP->>MCP: filter by ABP permissions<br/>of the bearer token MCP-->>Agent: only the tools this user can call Agent->>MCP: tools/call Loan_CheckOut(memberId, editionId) MCP->>MCP: re-check permission +<br/>map JSON args to DTO MCP->>Service: CheckOutAsync(input) Service->>DB: INSERT INTO Loans DB-->>Service: ok Service-->>MCP: LoanDto MCP-->>Agent: structured result + content blocks ``` > A 30-second screen recording of this flow against the bundled Library sample is tracked as [#18](https://github.com/tekthar/abp-mcp/issues/18). PRs welcome. **Status:** alpha. Available on NuGet as a prerelease — `dotnet add package AbpMcp --prerelease`. ## Why Every ABP app already declares its business logic as `IApplicationService` with typed DTOs, permission attributes, XML docs, and multi-tenancy awareness. That is richer metadata than any OpenAPI spec. Generic OpenAPI → MCP converters produce low-quality servers that confuse agents. `abp-mcp` skips the OpenAPI middleman entirely and generates from ABP's own API description pipeline — the same one that powers ABP's TS/C# proxy generators. ## Quickstart Install the NuGet (pre-release): ```bash dotnet add package AbpMcp --prerelease ``` Add `AbpMcpModule` to your application module's `[DependsOn(...)]`, then register the assembly that holds your application services: ```csharp [DependsOn( typeof(AbpAspNetCoreMvcModule), typeof(AbpMcpModule), /* your other modules */)] public class MyAppHttpApiHostModule : AbpModule { public override void ConfigureServices(ServiceConfigurationContext context) { // One call wires both ABP's ConventionalControllers (so the api-definition // provider sees the assembly's app services) and abp-mcp's ExposedAssemblies // filter (so the MCP scan scopes to it). context.Services.AddAbpMcpAssembly(typeof(MyAppApplicationModule).Assembly); Configure<AbpMcpOptions>(opts => { opts.Path = "/mcp"; }); } public override void OnApplicationInitialization(ApplicationInitializationContext context) { var app = context.GetApplicationBuilder(); app.UseRouting(); app.UseConfiguredEndpoints(endpoints => { endpoints.MapAbpMcp(); }); } } ``` Tag the services you want agent-accessible: ```csharp [McpTool] public class ProductAppService : ApplicationService, IProductAppService { [Authorize("Products.Create")] public Task<ProductDto> CreateAsync(CreateProductDto input) => /* ... */; } ``` ### Customising tool descriptions and names By default, each exposed method receives a mechanical description based on its class and method name — for example, `Invoke OrderAppService.PlaceOrderAsync.`. That is often enough for simple CRUD, but agents rely on descriptions to choose the right tool the first time. When a method carries business semantics the name alone does not convey, override the description explicitly: ```csharp // Default: agent sees "Invoke LoanAppService.CheckOutAsync." [McpTool] public class LoanAppService : ApplicationService, ILoanAppService { // Override: agent sees your business-intent description instead [McpTool(Description = "Check out a library edition to a member. " + "Pre-validates member status and copy availability; " + "rejects with LIBRARY:NO_COPIES_AVAILABLE if all copies are checked out " + "or LIBRARY:MEMBER_SUSPENDED if the member is suspended.")] public Task<LoanDto> CheckOutAsync(CheckOutDto input) => /* ... */; } ``` Override descriptions for tools where the action has business semantics the method name does not carry — refunds, cancellations, escalations, anything destructive or irreversible, or any method whose failure modes an agent should know about before calling it. #### Overriding the tool name The auto-generated name follows the pattern `ServicePrefix_MethodName` (e.g., `Loan_CheckOut`). Override it only when two services in different assemblies produce a colliding tool name and you want to disambiguate without relying on the configured prefix: ```csharp [McpTool(Name = "Library_CheckOut")] public Task<LoanDto> CheckOutAsync(CheckOutDto input) => /* ... */; ``` Name overrides are rare. Prefer fixing a prefix collision by adjusting `AbpMcpOptions` before reaching for a per-method `Name` override. #### Verifying your overrides Both `Description` and `Name` overrides are visible immediately at the discovery endpoint — no agent required: ```bash curl http://localhost:5000/mcp/_discover | jq '.tools[] | {name, description}' ``` Run this after adding an override to confirm the change took effect before pointing a real agent at the server. Point Claude (or any MCP client) at `https://your-host/mcp` with a bearer token from your ABP identity server, and the agent calls every exposed tool with the same permissions as a regular user. > Not in an `AbpModule`? The raw `builder.Services.AddAbpMcp(...)` + `app.MapAbpMcp()` path works too. The module-style example above is the one most ABP solutions reach for first. ## Try the sample (60 seconds, zero setup) The repo ships with a runnable ABP host that demonstrates the full surface against a small library domain (Titles, Editions, Members, Loans) seeded with classic books. ```bash dotnet run --project samples/AbpMcp.Sample ``` Then in another terminal: ```bash # What tools are live? curl http://localhost:5000/mcp/_discover | jq '.tools[].name' # → Catalog_SearchTitles, Catalog_GetTitle, Catalog_AddTitle, # Catalog_AddEdition, Catalog_ListAvailableEditions, # Loan_CheckOut, Loan_Return, Loan_Renew, Loan_ListForMember, # Loan_ListOverdue, Member_Register, Member_Get, Member_List, # Member_Suspend, Member_Reinstate # Why isn't a particular service showing up? curl 'http://localhost:5000/mcp/_explain?service=Loan' ``` Point Claude Desktop at `http://localhost:5000/mcp` by adding this to your `claude_desktop_config.json` (`%APPDATA%\Claude\claude_desktop_config.json` on Windows, `~/Library/Application Support/Claude/claude_desktop_config.json` on macOS): ```jsonc { "mcpServers": { "abp-mcp-sample": { "type": "streamable-http", "url": "http://localhost:5000/mcp" } } } ``` Restart Claude Desktop. The agent can now search the catalog, register members, and check books out — every call hitting a real `IApplicationService` and persisting through EF Core. ## Tenancy The MCP endpoint is mounted on the host's normal request pipeline, so ABP's `ICurrentTenant` resolution flows through unchanged. A bearer token issued for tenant `T` (with the `__tenant` claim set, the way ABP's identity server issues them) calls into tenant `T`'s data — no extra wiring. Host-level tenancy resolvers (header, cookie, route) work the same way they do for any ABP HTTP endpoint. Cross-tenant impersonation is intentionally *not* supported in v0.1. ## Design See [DESIGN.md](https://github.com/tekthar/abp-mcp/blob/main/DESIGN.md) for the full design document: - Problem statement and premises - Approaches considered (reflection runtime, source generator, LLM-enhanced descriptions) - Test plan - Distribution plan ## Repository layout ``` abp-mcp/ ├── src/ │ └── AbpMcp/ # the library │ ├── AbpMcpModule.cs # ABP module │ ├── AbpMcpBuilderExtensions.cs # AddAbpMcp / MapAbpMcp │ ├── AbpMcpOptions.cs │ ├── Attributes/ # [McpTool], [McpIgnore] │ ├── Metadata/ # ApiDefinitionReader, ToolDescriptorBuilder │ ├── Registration/ # DynamicMcpToolRegistry │ └── Dispatch/ # AbpMcpDispatcher ├── samples/ │ └── AbpMcp.Sample/ # runnable Library host (15 [McpTool] methods, seeded) ├── test/ │ ├── AbpMcp.Tests/ # unit tests (schema mapping, naming, options shape) │ └── AbpMcp.IntegrationTests/ # seed-DB → invoke-tool → verify-DB integration tests ├── .github/ │ ├── workflows/ # CI build+test, release-on-tag (signs + publishes) │ ├── ISSUE_TEMPLATE/ # bug + feature forms │ └── PULL_REQUEST_TEMPLATE.md ├── DESIGN.md # premises, alternatives, scope decisions ├── CHANGELOG.md # release notes ├── CONTRIBUTING.md # setup + design rules + PR process ├── SECURITY.md # private vulnerability reporting ├── CLAUDE.md # project guidance for agents & humans ├── LICENSE # MIT └── README.md ``` ## Contributing Pre-alpha. Direct PRs welcome — please skim [CONTRIBUTING.md](https://github.com/tekthar/abp-mcp/blob/main/CONTRIBUTING.md) before opening anything non-trivial. The non-negotiable design rules and the regression-test requirement are in there. Open invitations: - JSON Schema mapping for complex DTOs (recursion handling, polymorphism) - Streamable HTTP transport config refinements - Sample host integration against eShopOnAbp Every bug fix lands with a regression test. No exceptions. ## Other docs - [DESIGN.md](https://github.com/tekthar/abp-mcp/blob/main/DESIGN.md) — premises, alternatives considered, scope decisions - [CHANGELOG.md](https://github.com/tekthar/abp-mcp/blob/main/CHANGELOG.md) — what shipped when - [CONTRIBUTING.md](https://github.com/tekthar/abp-mcp/blob/main/CONTRIBUTING.md) — setup, design rules, PR process - [SECURITY.md](https://github.com/tekthar/abp-mcp/blob/main/SECURITY.md) — vulnerability reporting (do NOT open a public issue for security) - [CLAUDE.md](https://github.com/tekthar/abp-mcp/blob/main/CLAUDE.md) — project guidance for Claude Code & humans ## License [MIT](https://github.com/tekthar/abp-mcp/blob/main/LICENSE).