[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10},"actionData","errors","root",{"_309":310,"_311":312},"routes/_app.x.$handle.$name",{"_11":12,"_13":14,"_15":16,"_71":213,"_40":-7,"_214":-5,"_17":215,"_216":217,"_218":219,"_220":221,"_222":223,"_109":-5,"_224":225,"_226":227,"_228":48,"_229":230,"_231":26,"_232":-5,"_233":-5,"_234":235},"routes/_app.x.$handle.$name.compare.$branch",{"_11":12,"_13":14,"_15":16,"_17":18,"_19":20,"_21":22,"_23":24,"_25":26,"_27":28,"_29":30,"_31":-5},"handle","thevt1","name","mcp-gateway","branchName","main","project",{"_32":59,"_13":14,"_34":173,"_46":-5,"_174":48,"_49":50,"_175":50,"_176":177,"_178":179,"_180":181,"_182":79,"_183":26,"_184":-5,"_185":-5,"_186":22,"_53":187,"_188":-5,"_189":-5,"_190":-5,"_191":-5,"_192":193,"_194":193,"_195":196,"_197":196,"_198":196,"_199":193,"_200":193,"_201":202,"_203":204,"_205":28,"_47":48},"ahead",7,"behind",0,"diff",{"_63":64,"_65":66,"_67":68},"hasChanges",true,"sourceBranch",{"_40":57,"_13":16,"_32":58,"_38":59,"_42":33,"_43":41,"_60":50,"_61":39,"_62":54,"_55":14,"_51":12},"targetBranch",{"_32":33,"_34":35,"_36":37,"_13":16,"_38":39,"_40":41,"_42":-5,"_43":-5,"_44":45,"_46":-5,"_47":48,"_49":50,"_51":52,"_53":54,"_55":56},"pull","id","69713bf6-594c-11f1-a5c4-ee650bb23af1","createdAt",["D",1779832014660],"updatedAt",["D",1779896135471],"projectId","69708896-594c-11f1-a5c4-ee650bb23af1","version",20,"forkedBranchId","forkedBranchVersion","lockfileKey","1779896174494-esm.town_v_templates_hono-jsx-starter@20-main","deletedAt","isOwned",false,"privacy","public","userHandle","templates","orgId","019aa807-52c2-709c-928b-2029bae9a558","projectName","hono-jsx-starter",8,"a512eba7-02b2-45dc-b6d5-35e156574e53","87c02ff4-ba2e-4342-9fae-eee645b2363d","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","added",[133,134,135,136],"deleted",[120],"modified",[69,70],{"_71":103,"_73":104,"_75":105},{"_71":72,"_73":74,"_75":76},"path","index.tsx","targetFile",{"_32":96,"_13":72,"_78":97,"_80":-5,"_81":33,"_82":98,"_84":26,"_34":99,"_40":83,"_87":88,"_89":100,"_65":48,"_91":-5,"_92":-7,"_71":101,"_94":102},"sourceFile",{"_32":77,"_13":72,"_78":79,"_80":-5,"_81":58,"_82":83,"_84":26,"_34":85,"_40":86,"_87":88,"_89":90,"_65":48,"_91":-5,"_92":-7,"_71":93,"_94":95},"844177bb-421b-4572-858e-03b6d48d858b","fileId","019fbb4c-435a-77b6-a1db-ed03ccfe08b5","parentId","branchId","branchVersion",6,"latest",["D",1785553824497],1,"fileType","http","content","/** @jsxImportSource npm:hono@4/jsx */\nimport { Hono } from \"npm:hono@4\";\nimport { parseVal, serveFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { providers } from \"./providers.ts\";\nimport { handleMcpRequest } from \"./mcpServer.ts\";\nimport { listAllTools } from \"./registry.ts\";\n\nconst Layout = ({ title, children }: { title: string; children: any }) => (\n \n \n {title}\n \n \n \n \n \n \n \n {children}\n \n \n);\n\nconst app = new Hono();\n\napp.get(\"/\", async (c) => {\n let tools: any[] = [];\n let toolsError: string | null = null;\n try {\n tools = await listAllTools();\n } catch (err) {\n toolsError = err instanceof Error ? err.message : String(err);\n }\n\n return c.html(\n \n

MCP Gateway

\n A single, authless public MCP endpoint that tunnels to multiple upstream MCP providers\n (each of which may require its own token). Secrets live server-side as env vars — nothing\n is exposed to callers.\n

\n\n

\n MCP endpoint: POST /mcp\n

\n Add this as a \"Streamable HTTP\" remote MCP server in any MCP client. No auth headers\n needed.\n

\n\n

Providers

\n
{p.name}
\n
{p.description}
\n
\n {p.url} {p.authEnvVar ? `(token via ${p.authEnvVar})` : \"(no token required)\"}\n
\n

\n\n

\n Aggregated tools {toolsError ? \"\" : `(${tools.length})`}\n

\n {toolsError\n ?

Failed to load tools: {toolsError}

\n : (\n

\n {t.name}\n — {t.description}\n

\n )}\n ,\n );\n});\n\n// The public, authless MCP endpoint. Clients POST JSON-RPC 2.0 messages here.\napp.post(\"/mcp\", async (c) => {\n let body: unknown;\n try {\n body = await c.req.json();\n } catch {\n return c.json(\n { jsonrpc: \"2.0\", id: null, error: { code: -32700, message: \"Parse error\" } },\n 400,\n );\n }\n\n const result = await handleMcpRequest(body);\n\n // Notifications (e.g. `notifications/initialized`) produce no response body.\n if (result === null) return new Response(null, { status: 202 });\n\n return c.json(result);\n});\n\n// This server doesn't push server-initiated events, so it doesn't support the\n// optional GET-for-SSE-stream half of the Streamable HTTP spec.\napp.get(\"/mcp\", (c) => c.text(\"Method Not Allowed: this endpoint only accepts POST\", 405));\n\n// Serve static files\napp.get(\"/public/*\", (c) => serveFile(c.req.path));\n\n// View source on Val Town\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\n\n// Unwrap and rethrow Hono errors as the original error\napp.onError((err) => Promise.reject(err));\n\nexport default app.fetch;\n","label","children",[72],"contentHash","1cada3efb2bed66a6648f8224a04ebe364721c2c3f8d1d7003f4225397aeaefe","fbbcf208-59dc-11f1-be2c-ee650bb23af1","69785ed6-594c-11f1-a5c4-ee650bb23af1",18,["D",1779894107586],"/** @jsxImportSource npm:hono@4/jsx */\nimport { Hono } from \"npm:hono@4\";\nimport { parseVal, serveFile } from \"https://esm.town/v/std/utils/index.ts\";\n\n// In-memory state. Resets whenever the server restarts.\n// For persistence across restarts, use std/sqlite or std/blob.\nlet count = 0;\n\nconst Layout = ({ title, children }: { title: string; children: any }) => (\n \n \n {title}\n \n \n \n \n \n \n \n {children}\n \n \n);\n\nconst app = new Hono();\n\napp.get(\"/\", (c) =>\n c.html(\n \n

Hello from Hono JSX

\n A minimal Val Town starter.{\" \"}\n \n Remix this val.\n \n

\n Server count:{\" \"}\n {count}\n

\n \n Increment\n \n

\n Lives in memory on the server. Resets when the val restarts.\n

\n \n ,\n ));\n\napp.get(\"/about\", (c) =>\n c.html(\n \n

About

Server-rendered with Hono JSX on Val Town.

\n ,\n ));\n\n// API routes\napp.post(\"/api/increment\", (c) => c.json({ count: ++count }));\n\n// Serve static files\napp.get(\"/public/*\", (c) => serveFile(c.req.path));\n\n// View source on Val Town\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\n\n// Unwrap and rethrow Hono errors as the original error\napp.onError((err) => Promise.reject(err));\n\nexport default app.fetch;",[72],"83f37903b7df885959707ebe91f418a222ba8e8927b6315c79b42b6d09b6bc38","README.md",{"_32":113,"_13":103,"_78":114,"_80":-5,"_81":33,"_82":41,"_84":26,"_34":115,"_40":116,"_87":109,"_89":117,"_65":48,"_91":-5,"_92":-7,"_71":118,"_94":119},{"_32":106,"_13":103,"_78":107,"_80":-5,"_81":58,"_82":57,"_84":26,"_34":108,"_40":86,"_87":109,"_89":110,"_65":48,"_91":-5,"_92":-7,"_71":111,"_94":112},"fccd7a94-13e7-4d14-9098-56d24c15eac1","019fbb4c-435a-77b6-a1db-ea2d40b85af2",["D",1785553868841],"file","# mcp-gateway\n\nAn **authless, public MCP server** that tunnels to multiple upstream MCP\nproviders — each of which may require its own token (like [Context7](https://context7.com)).\nCallers hit one endpoint with no auth; the gateway injects each provider's\nsecret server-side.\n\n```mermaid\nflowchart LR\n client[MCP Client
Claude, Cursor, etc.] -- \"POST /mcp
(no auth)\" --> gw[mcp-gateway]\n gw -- \"CONTEXT7_API_KEY\" --> c7[Context7 MCP]\n gw -- \"your token\" --> other[Any other MCP provider]\n```\n\n## Try it\n\nAdd this val's live `/mcp` endpoint as a remote **Streamable HTTP** MCP server\nin any MCP-compatible client (Claude Code, Cursor, etc.). No headers or API\nkeys required on the client side.\n\nVisit the homepage (`/`) to see configured providers and the live aggregated\ntool list.\n\n## How it works\n\n| File | Responsibility |\n| --- | --- |\n| `providers.ts` | Config for each upstream provider: URL + which env var holds its secret |\n| `mcpClient.ts` | A minimal MCP **client** — speaks the Streamable HTTP handshake (`initialize` → `notifications/initialized` → `tools/list`/`tools/call`) to upstream providers |\n| `registry.ts` | Aggregates tools from all providers into one namespace (prefixed `__`), caches `tools/list` briefly, and dispatches `tools/call` to the right upstream |\n| `mcpServer.ts` | The public-facing MCP **server** — JSON-RPC 2.0 method handling for `initialize`, `tools/list`, `tools/call` |\n| `index.tsx` | Hono app: `POST /mcp` (the protocol endpoint) + a homepage documenting providers/tools |\n\nTools are namespaced so multiple providers can coexist without collisions,\ne.g. `context7__resolve-library-id` and `context7__query-docs`.\n\n## Adding another provider\n\n1. Add an entry to the `providers` array in `providers.ts`:\n ```ts\n {\n id: \"firecrawl\",\n name: \"Firecrawl\",\n url: \"https://mcp.firecrawl.dev/mcp\",\n authEnvVar: \"FIRECRAWL_API_KEY\",\n authHeader: \"Authorization\",\n authPrefix: \"Bearer \",\n }\n ```\n2. Add the corresponding env var to this val (see below).\n3. That's it — its tools show up automatically in `tools/list`, prefixed\n `firecrawl__...`.\n\n## Env vars\n\nOnly needed for providers that require a token. Context7 works without one at\nlower rate limits; set `CONTEXT7_API_KEY` for higher limits.\n\n👉 Add CONTEXT7_API_KEY here: https://www.val.town/x/thevt1/mcp-gateway/environment-variables?key=CONTEXT7_API_KEY\n\n## Notes / limitations\n\n- Each `tools/call` re-runs the upstream `initialize` handshake (stateless,\n simple, robust — no session expiry bugs). `tools/list` results are cached\n in-memory for 5 minutes per warm instance.\n- This server doesn't push server-initiated events, so `GET /mcp` (the\n optional SSE-stream half of the Streamable HTTP spec) returns 405.\n- Because the gateway itself is authless, treat it as semi-public: anyone who\n can reach `/mcp` can spend your upstream providers' rate limits/quota. Put\n it behind Val Town's [restricted HTTP privacy](https://docs.val.town) or a\n bypass token if you need to lock it down.\n",[103],"159bb7ad4fa21096dfd5092c8055cd0dbc2fe25c177d7b4335f8b2346938ff49","b46e257a-59e1-11f1-8b26-ee650bb23af1","506a9fac-59d4-11f1-a4ea-ee650bb23af1",["D",1779896135471],9,"# hono-jsx-starter\n\nA minimal [Hono](https://hono.dev) + Hono JSX starter for Val Town.\nServer-rendered HTML, no build step, no React.\n\n## Picking a starter\n\n| Starter | When to pick it |\n| --- | --- |\n| [`basic-html-starter`](https://www.val.town/x/templates/basic-html-starter) | Static HTML pages. Sprinkle of vanilla JS. No server-side rendering. |\n| **[`hono-jsx-starter`](https://www.val.town/x/templates/hono-jsx-starter)** *(you're here)* | Dynamic server-rendered HTML with JSX. API routes. No React, no SPA. |\n| [`react-hono-starter`](https://www.val.town/x/templates/react-hono-starter) | Client-side React SPA with a Hono API backend. |\n\n## What's here\n\n```\nindex.tsx Hono app, Layout, routes\npublic/\n favicon.svg Static asset\n counter.ts Tiny client-side script\n```\n\nThe whole app fits in one file. As you grow it, the natural next moves are:\n\n- Pull `Layout` into its own `.tsx` file once you have 3+ pages.\n- Split routes with `app.route(\"/api\", api)` if `/api/*` grows.\n- Add more files under `public/` — they're served by a single\n `app.get(\"/public/*\", ...)` route.\n\n## Patterns worth knowing\n\n**JSX pragma.** Every `.tsx` file that uses JSX needs this at the top:\n\n```tsx\n/** @jsxImportSource npm:hono@4/jsx */\n```\n\n**Server state.** The counter on `/` is `let count = 0` at module scope. It\nlives in memory on the Val Town server and survives across requests — but resets\nwhenever the val restarts (deploys, idle timeouts, etc.). For persistent state,\nswap it for [`std/sqlite`](https://www.val.town/x/std/sqlite) or\n[`std/blob`](https://www.val.town/x/std/blob).\n\n**API routes.** The `Increment` button POSTs to `/api/increment`, which returns\nJSON. Mix server-rendered pages and JSON endpoints in the same Hono app:\n\n```ts\napp.post(\"/api/increment\", (c) => c.json({ count: ++count }));\n```\n\n**Static files.** `serveFile` reads the file by path and serves it with the\nright content-type. `.ts` files are transpiled to JS on request by Val Town — so\nyou can write `public/counter.ts` and reference it as\n`

Compare

Mergethevt1/mainintotemplates/main

README.md+55-60

Hindex.tsx+80-38

mcpClient.ts+125-0

mcpServer.ts+86-0

providers.ts+49-0

registry.ts+60-0

public/counter.ts+0-8