This change enables the strictUnions option in zod-to-json-schema so
that any union members that cannot be resolved are excluded from the
resulting JSON Schema anyOf array.
Previously, a schema like this:
**Before**
```ts
import { zodToJsonSchema } from "zod-to-json-schema";
import { z } from "zod";
console.dir(
zodToJsonSchema(
z.union([
z
.string()
.base64()
.transform((v) => Uint8Array.from(atob(v), (v) => v.charCodeAt(0))),
z.instanceof(ReadableStream<Uint8Array>),
z.instanceof(Blob),
z.instanceof(ArrayBuffer),
z.instanceof(Uint8Array),
])
),
{ depth: null }
);
```
Prints:
```js
{
anyOf: [
{ type: "string", contentEncoding: "base64" }, {}, {}, {}, {}
],
$schema: "http://json-schema.org/draft-07/schema#",
}
```
**After**
```ts
import { zodToJsonSchema } from "zod-to-json-schema";
import { z } from "zod";
console.dir(
zodToJsonSchema(
z.union([
z
.string()
.base64()
.transform((v) => Uint8Array.from(atob(v), (v) => v.charCodeAt(0))),
z.instanceof(ReadableStream<Uint8Array>),
z.instanceof(Blob),
z.instanceof(ArrayBuffer),
z.instanceof(Uint8Array),
]),
{ strictUnions: true }, // 👈
),
{ depth: null }
);
```
Prints:
```js
{
anyOf: [
{ type: "string", contentEncoding: "base64" }
],
$schema: "http://json-schema.org/draft-07/schema#",
}
```
---
I picked this example in particular because I have modelled file uploads
using a permissive schema that accepts streams, byte arrays / blobs and
base64-encoded strings. In the context of MCP, base64 would be most
applicable so I wanted to drop the other union members that couldn't be
represented in JSON Schema.
When launching inspector and changing to use SSE, the URL is set to `http://localhost:3001/sse`. It's quite confusing to have an example use different endpoint names and port, hence the change.
Request handlers were being re-registered every time a new tool/resource/prompt was added, which would fail since the handlers were already registered. Now we track whether handlers have been initialized and only register them once.
Added tests to verify that multiple registrations work correctly.
Resolves#124.
