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Plugin `tools[]` overlapped with MCP, kandev's established mechanism for exposing tools to agents (`internal/mcp/`), and the `InvokeTool` path was never wired into agent tool sets — the `listTools` handler was listing-only. Rather than maintain a half-built parallel surface, remove it. If plugins ever contribute agent tools, they should feed through MCP, not a separate `InvokeTool` RPC. Removes: - proto `InvokeTool` RPC + `ToolRequest`/`ToolResponse`/`ToolContext` messages (regenerated `*.pb.go` / `*_grpc.pb.go`) - pkg/pluginsdk `InvokeTool` from the `Plugin` interface and `UnimplementedPlugin`, the Tool* Go-native types, and the `RemotePlugin`/`GRPCServer` dispatch - internal/plugins `Service.InvokeTool`, the `listTools` handler + `GET /api/plugins/tools` route, `PluginToolDTO`, and the manifest `Tools` field + tool-name uniqueness validation - frontend `PluginTool`/`PluginToolDTO` types, `listPluginTools`, and the manifest-card tools list - fixture/e2e `InvokeTool` echo impl and the `tools:` manifest block Test doubles that used the "crash" tool to exercise crash-restart now use a "crash" webhook key instead. Internal specs (GRPC-CONTRACT, spec) drop the tool RPC/feature; docs/public was already updated in #1774. Co-authored-by: Kandev Agent <agent@kandev.dev> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>