| 1 | import { OrchestratorMcpFailure } from "@t3tools/contracts"; |
| 2 | import * as Effect from "effect/Effect"; |
| 3 | |
| 4 | import * as HtmlRender from "../../../htmlRender/HtmlRender.ts"; |
| 5 | import * as McpInvocationContext from "../../McpInvocationContext.ts"; |
| 6 | import * as McpToolAccess from "../../McpToolAccess.ts"; |
| 7 | import { HtmlPreviewToolkit, HtmlRenderToolkit, type HtmlToolkit } from "./tools.ts"; |
| 8 | |
| 9 | const INVALID_PAGE_ERRORS = new Set([ |
| 10 | "HtmlRenderImagesNotFoundError", |
| 11 | "HtmlRenderImageTooLargeError", |
| 12 | "HtmlRenderPageTooLargeError", |
| 13 | ]); |
| 14 | |
| 15 | // Every HTML render error message is built on the server and tells the agent what to do next. |
| 16 | const toFailure = (error: { readonly _tag: string; readonly message: string }) => |
| 17 | new OrchestratorMcpFailure({ |
| 18 | code: INVALID_PAGE_ERRORS.has(error._tag) ? "invalid_request" : "orchestration_error", |
| 19 | message: error.message, |
| 20 | }); |
| 21 | |
| 22 | const handlers = { |
| 23 | // The headless browser runs on the host and can open local files, so only |
| 24 | // agents T3 launched, which already work on this machine, get it. |
| 25 | html_preview: McpToolAccess.readsAsCaller((input) => |
| 26 | Effect.gen(function* () { |
| 27 | const htmlRender = yield* HtmlRender.HtmlRender; |
| 28 | const { png, ...preview } = yield* htmlRender.preview(input).pipe(Effect.mapError(toFailure)); |
| 29 | return { |
| 30 | ...preview, |
| 31 | screenshot: { |
| 32 | mimeType: "image/png" as const, |
| 33 | data: png, |
| 34 | width: preview.width, |
| 35 | height: preview.capturedHeight, |
| 36 | }, |
| 37 | }; |
| 38 | }), |
| 39 | ), |
| 40 | // The page is stored in the calling thread, so it needs that thread's live run. |
| 41 | html_render: McpToolAccess.actsAsCaller((input) => |
| 42 | Effect.gen(function* () { |
| 43 | const scope = yield* McpInvocationContext.McpInvocationContext; |
| 44 | const { thread } = yield* McpInvocationContext.requireThreadScope(scope, "html_render"); |
| 45 | const htmlRender = yield* HtmlRender.HtmlRender; |
| 46 | const reference = yield* htmlRender |
| 47 | .publish({ threadId: thread.threadId, ...input }) |
| 48 | .pipe(Effect.mapError(toFailure)); |
| 49 | return { |
| 50 | htmlRender: reference, |
| 51 | message: |
| 52 | "Shown to the reader above your reply. Don't mention or describe the page; reply with only what it doesn't already say.", |
| 53 | }; |
| 54 | }), |
| 55 | ), |
| 56 | } satisfies McpToolAccess.Handlers<typeof HtmlToolkit.tools>; |
| 57 | |
| 58 | export const layerPreview = McpToolAccess.toLayer(HtmlPreviewToolkit, { |
| 59 | html_preview: handlers.html_preview, |
| 60 | }); |
| 61 | |
| 62 | export const layerRender = McpToolAccess.toLayer(HtmlRenderToolkit, { |
| 63 | html_render: handlers.html_render, |
| 64 | }); |