generate schema with refs

This commit is contained in:
Caitie McCaffrey 2026-05-11 15:53:04 -07:00
commit b8acfa0b6b
8 changed files with 1497 additions and 380 deletions

19
.github/workflows/ci.yml vendored Normal file
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name: CI
on:
push:
branches: [main]
pull_request:
branches: [main]
jobs:
check-schema:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- uses: actions/setup-node@v4
with:
node-version: "24"
- run: npm ci
- run: npm run check:schema:ts
- run: npm run check:schema:json

1
.gitignore vendored
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@ -7,3 +7,4 @@ package-lock.json
.jj/
*.tsbuildinfo
dist/
schema/**/generated/

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@ -2,13 +2,20 @@
"name": "@modelcontextprotocol/experimental-ext-tasks",
"private": true,
"version": "0.1.0",
"type": "module",
"description": "MCP Tasks Extension - Experimental extension for task management in the Model Context Protocol",
"license": "Apache-2.0",
"scripts": {
"check:schema": "tsc --noEmit"
"generate:schemas": "tsx scripts/generate-schemas.ts",
"check:schema": "npm run check:schema:ts && npm run check:schema:json",
"check:schema:ts": "tsc --noEmit",
"check:schema:json": "tsx scripts/generate-schemas.ts --check"
},
"devDependencies": {
"@modelcontextprotocol/sdk": "^1.29.0",
"typescript": "^5.0.0"
"ts-to-zod": "^5.1.0",
"tsx": "^4.21.0",
"typescript": "^5.0.0",
"zod": "^4.4.3"
}
}

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342
schema/2025-11-25/schema.ts Normal file
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/**
* MCP Tasks Extension Schema (spec.types.ts)
* Extension Identifier: io.modelcontextprotocol/tasks
*
* This file contains pure TypeScript interface definitions for the MCP Tasks extension.
* These types are the source of truth and are used to generate Zod schemas via `ts-to-zod`.
*
* - Use `@description` JSDoc tags to generate `.describe()` calls on schemas
* - Run `npm run generate:schemas` to regenerate schemas from these types
*
* @see https://modelcontextprotocol.io/specification/2025-11-25/basic/utilities/tasks
*/
import type {
Cursor,
JSONRPCNotification,
JSONRPCRequest,
NotificationParams,
PaginatedRequest,
PaginatedResult,
ProgressToken,
RequestId,
RequestParams,
Result,
} from "@modelcontextprotocol/sdk/types.js";
/* Tasks */
/**
* The status of a task.
*
* @category `tasks`
*/
export type TaskStatus =
| "working" // The request is currently being processed
| "input_required" // The task is waiting for input (e.g., elicitation or sampling)
| "completed" // The request completed successfully and results are available
| "failed" // The associated request did not complete successfully. For tool calls specifically, this includes cases where the tool call result has `isError` set to true.
| "cancelled"; // The request was cancelled before completion
/**
* Metadata for augmenting a request with task execution.
* Include this in the `task` field of the request parameters.
*
* @category `tasks`
*/
export interface TaskMetadata {
/**
* Requested duration in milliseconds to retain task from creation.
*/
ttl?: number;
}
/**
* Metadata for associating messages with a task.
* Include this in the `_meta` field under the key `io.modelcontextprotocol/related-task`.
*
* @category `tasks`
*/
export interface RelatedTaskMetadata {
/**
* The task identifier this message is associated with.
*/
taskId: string;
}
/**
* Data associated with a task.
*
* @category `tasks`
*/
export interface Task {
/**
* The task identifier.
*/
taskId: string;
/**
* Current task state.
*/
status: TaskStatus;
/**
* Optional human-readable message describing the current task state.
* This can provide context for any status, including:
* - Reasons for "cancelled" status
* - Summaries for "completed" status
* - Diagnostic information for "failed" status (e.g., error details, what went wrong)
*/
statusMessage?: string;
/**
* ISO 8601 timestamp when the task was created.
*/
createdAt: string;
/**
* ISO 8601 timestamp when the task was last updated.
*/
lastUpdatedAt: string;
/**
* Actual retention duration from creation in milliseconds, null for unlimited.
* @nullable
*/
ttl: number | null;
/**
* Suggested polling interval in milliseconds.
*/
pollInterval?: number;
}
/**
* A response to a task-augmented request.
*
* @category `tasks`
*/
export interface CreateTaskResult extends Result {
task: Task;
}
/* Task Operations */
/**
* A request to retrieve the state of a task.
*
* @category `tasks/get`
*/
export interface GetTaskRequest extends JSONRPCRequest {
method: "tasks/get";
params: {
/**
* The task identifier to query.
*/
taskId: string;
};
}
/**
* The response to a tasks/get request.
*
* @category `tasks/get`
*/
export type GetTaskResult = Result & Task;
/**
* A request to retrieve the result of a completed task.
*
* @category `tasks/result`
*/
export interface GetTaskPayloadRequest extends JSONRPCRequest {
method: "tasks/result";
params: {
/**
* The task identifier to retrieve results for.
*/
taskId: string;
};
}
/**
* The response to a tasks/result request.
* The structure matches the result type of the original request.
* For example, a tools/call task would return the CallToolResult structure.
*
* @category `tasks/result`
*/
export interface GetTaskPayloadResult extends Result {
[key: string]: unknown;
}
/**
* A request to cancel a task.
*
* @category `tasks/cancel`
*/
export interface CancelTaskRequest extends JSONRPCRequest {
method: "tasks/cancel";
params: {
/**
* The task identifier to cancel.
*/
taskId: string;
};
}
/**
* The response to a tasks/cancel request.
*
* @category `tasks/cancel`
*/
export type CancelTaskResult = Result & Task;
/**
* A request to retrieve a list of tasks.
*
* @category `tasks/list`
*/
export interface ListTasksRequest extends PaginatedRequest {
method: "tasks/list";
}
/**
* The response to a tasks/list request.
*
* @category `tasks/list`
*/
export interface ListTasksResult extends PaginatedResult {
tasks: Task[];
}
/* Task Notifications */
/**
* Parameters for a `notifications/tasks/status` notification.
*
* @category `notifications/tasks/status`
*/
export type TaskStatusNotificationParams = NotificationParams &
Task & { [key: string]: unknown };
/**
* An optional notification from the receiver to the requestor, informing them that a task's status has changed. Receivers are not required to send these notifications.
*
* @category `notifications/tasks/status`
*/
export interface TaskStatusNotification extends JSONRPCNotification {
method: "notifications/tasks/status";
params: TaskStatusNotificationParams;
}
/* Task-Augmented Request Params */
/**
* Common params for any task-augmented request.
* Extends the base RequestParams to include an optional `task` field.
*
* @category `tasks`
*/
export interface TaskAugmentedRequestParams extends RequestParams {
/**
* If specified, the caller is requesting task-augmented execution for this request.
* The request will return a CreateTaskResult immediately, and the actual result can be
* retrieved later via tasks/result.
*
* Task augmentation is subject to capability negotiation - receivers MUST declare support
* for task augmentation of specific request types in their capabilities.
*/
task?: TaskMetadata;
}
/* Capability Additions */
/**
* Task-related server capabilities.
* Include this in the server's `capabilities` object during initialization.
*
* @category `tasks`
*/
export interface TaskServerCapabilities {
tasks?: {
/**
* Whether this server supports tasks/list.
*/
list?: Record<string, never>;
/**
* Whether this server supports tasks/cancel.
*/
cancel?: Record<string, never>;
/**
* Specifies which request types can be augmented with tasks.
*/
requests?: {
/**
* Task support for tool-related requests.
*/
tools?: {
/**
* Whether the server supports task-augmented tools/call requests.
*/
call?: Record<string, never>;
};
};
};
}
/**
* Task-related client capabilities.
* Include this in the client's `capabilities` object during initialization.
*
* @category `tasks`
*/
export interface TaskClientCapabilities {
tasks?: {
/**
* Whether this client supports tasks/list.
*/
list?: Record<string, never>;
/**
* Whether this client supports tasks/cancel.
*/
cancel?: Record<string, never>;
/**
* Specifies which request types can be augmented with tasks.
*/
requests?: {
/**
* Task support for sampling-related requests.
*/
sampling?: {
/**
* Whether the client supports task-augmented sampling/createMessage requests.
*/
createMessage?: Record<string, never>;
};
/**
* Task support for elicitation-related requests.
*/
elicitation?: {
/**
* Whether the client supports task-augmented elicitation/create requests.
*/
create?: Record<string, never>;
};
};
};
}
/* Tool-Level Task Support */
/**
* Task support declaration for individual tools.
* Include this in the tool's definition returned by tools/list.
*
* - "forbidden": Tool does not support task-augmented execution (default when absent)
* - "optional": Tool may support task-augmented execution
* - "required": Tool requires task-augmented execution
*
* @category `tasks`
*/
export type ToolTaskSupport = "forbidden" | "optional" | "required";

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@ -1,374 +0,0 @@
{
"$schema": "http://json-schema.org/draft-07/schema#",
"description": "MCP Tasks Extension Schema. Contains only task-related definitions from the MCP 2025-11-25 specification. Core MCP types are referenced via remote $ref pointing to the 2025-11-25 core schema.",
"$comment": "Extension Identifier: io.modelcontextprotocol/tasks. Core schema: https://github.com/modelcontextprotocol/modelcontextprotocol/tree/2025-11-25/schema/2025-11-25",
"$defs": {
"TaskStatus": {
"description": "The status of a task.",
"enum": ["cancelled", "completed", "failed", "input_required", "working"],
"type": "string"
},
"TaskMetadata": {
"description": "Metadata for augmenting a request with task execution.\nInclude this in the `task` field of the request parameters.",
"properties": {
"ttl": {
"description": "Requested duration in milliseconds to retain task from creation.",
"type": "integer"
}
},
"type": "object"
},
"RelatedTaskMetadata": {
"description": "Metadata for associating messages with a task.\nInclude this in the `_meta` field under the key `io.modelcontextprotocol/related-task`.",
"properties": {
"taskId": {
"description": "The task identifier this message is associated with.",
"type": "string"
}
},
"required": ["taskId"],
"type": "object"
},
"Task": {
"description": "Data associated with a task.",
"properties": {
"createdAt": {
"description": "ISO 8601 timestamp when the task was created.",
"type": "string"
},
"lastUpdatedAt": {
"description": "ISO 8601 timestamp when the task was last updated.",
"type": "string"
},
"pollInterval": {
"description": "Suggested polling interval in milliseconds.",
"type": "integer"
},
"status": {
"$ref": "#/$defs/TaskStatus",
"description": "Current task state."
},
"statusMessage": {
"description": "Optional human-readable message describing the current task state.\nThis can provide context for any status, including:\n- Reasons for \"cancelled\" status\n- Summaries for \"completed\" status\n- Diagnostic information for \"failed\" status (e.g., error details, what went wrong)",
"type": "string"
},
"taskId": {
"description": "The task identifier.",
"type": "string"
},
"ttl": {
"description": "Actual retention duration from creation in milliseconds, null for unlimited.",
"type": ["integer", "null"]
}
},
"required": ["createdAt", "lastUpdatedAt", "status", "taskId", "ttl"],
"type": "object"
},
"CreateTaskResult": {
"description": "A response to a task-augmented request.",
"properties": {
"_meta": {
"additionalProperties": {},
"description": "See [General fields: `_meta`](/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.",
"type": "object"
},
"task": {
"$ref": "#/$defs/Task"
}
},
"required": ["task"],
"type": "object"
},
"TaskAugmentedRequestParams": {
"description": "Common params for any task-augmented request.",
"properties": {
"_meta": {
"additionalProperties": {},
"description": "See [General fields: `_meta`](/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.",
"properties": {
"progressToken": {
"$ref": "https://raw.githubusercontent.com/modelcontextprotocol/modelcontextprotocol/main/schema/2025-11-25/schema.json#/$defs/ProgressToken",
"description": "If specified, the caller is requesting out-of-band progress notifications for this request (as represented by notifications/progress). The value of this parameter is an opaque token that will be attached to any subsequent notifications. The receiver is not obligated to provide these notifications."
}
},
"type": "object"
},
"task": {
"$ref": "#/$defs/TaskMetadata",
"description": "If specified, the caller is requesting task-augmented execution for this request.\nThe request will return a CreateTaskResult immediately, and the actual result can be\nretrieved later via tasks/result.\n\nTask augmentation is subject to capability negotiation - receivers MUST declare support\nfor task augmentation of specific request types in their capabilities."
}
},
"type": "object"
},
"GetTaskRequest": {
"description": "A request to retrieve the state of a task.",
"properties": {
"id": {
"$ref": "https://raw.githubusercontent.com/modelcontextprotocol/modelcontextprotocol/main/schema/2025-11-25/schema.json#/$defs/RequestId"
},
"jsonrpc": {
"const": "2.0",
"type": "string"
},
"method": {
"const": "tasks/get",
"type": "string"
},
"params": {
"properties": {
"taskId": {
"description": "The task identifier to query.",
"type": "string"
}
},
"required": ["taskId"],
"type": "object"
}
},
"required": ["id", "jsonrpc", "method", "params"],
"type": "object"
},
"GetTaskResult": {
"allOf": [
{
"$ref": "https://raw.githubusercontent.com/modelcontextprotocol/modelcontextprotocol/main/schema/2025-11-25/schema.json#/$defs/Result"
},
{
"$ref": "#/$defs/Task"
}
],
"description": "The response to a tasks/get request."
},
"GetTaskPayloadRequest": {
"description": "A request to retrieve the result of a completed task.",
"properties": {
"id": {
"$ref": "https://raw.githubusercontent.com/modelcontextprotocol/modelcontextprotocol/main/schema/2025-11-25/schema.json#/$defs/RequestId"
},
"jsonrpc": {
"const": "2.0",
"type": "string"
},
"method": {
"const": "tasks/result",
"type": "string"
},
"params": {
"properties": {
"taskId": {
"description": "The task identifier to retrieve results for.",
"type": "string"
}
},
"required": ["taskId"],
"type": "object"
}
},
"required": ["id", "jsonrpc", "method", "params"],
"type": "object"
},
"GetTaskPayloadResult": {
"additionalProperties": {},
"description": "The response to a tasks/result request.\nThe structure matches the result type of the original request.\nFor example, a tools/call task would return the CallToolResult structure.",
"properties": {
"_meta": {
"additionalProperties": {},
"description": "See [General fields: `_meta`](/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.",
"type": "object"
}
},
"type": "object"
},
"CancelTaskRequest": {
"description": "A request to cancel a task.",
"properties": {
"id": {
"$ref": "https://raw.githubusercontent.com/modelcontextprotocol/modelcontextprotocol/main/schema/2025-11-25/schema.json#/$defs/RequestId"
},
"jsonrpc": {
"const": "2.0",
"type": "string"
},
"method": {
"const": "tasks/cancel",
"type": "string"
},
"params": {
"properties": {
"taskId": {
"description": "The task identifier to cancel.",
"type": "string"
}
},
"required": ["taskId"],
"type": "object"
}
},
"required": ["id", "jsonrpc", "method", "params"],
"type": "object"
},
"CancelTaskResult": {
"allOf": [
{
"$ref": "https://raw.githubusercontent.com/modelcontextprotocol/modelcontextprotocol/main/schema/2025-11-25/schema.json#/$defs/Result"
},
{
"$ref": "#/$defs/Task"
}
],
"description": "The response to a tasks/cancel request."
},
"ListTasksRequest": {
"description": "A request to retrieve a list of tasks.",
"properties": {
"id": {
"$ref": "https://raw.githubusercontent.com/modelcontextprotocol/modelcontextprotocol/main/schema/2025-11-25/schema.json#/$defs/RequestId"
},
"jsonrpc": {
"const": "2.0",
"type": "string"
},
"method": {
"const": "tasks/list",
"type": "string"
},
"params": {
"$ref": "https://raw.githubusercontent.com/modelcontextprotocol/modelcontextprotocol/main/schema/2025-11-25/schema.json#/$defs/PaginatedRequestParams"
}
},
"required": ["id", "jsonrpc", "method"],
"type": "object"
},
"ListTasksResult": {
"description": "The response to a tasks/list request.",
"properties": {
"_meta": {
"additionalProperties": {},
"description": "See [General fields: `_meta`](/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.",
"type": "object"
},
"nextCursor": {
"description": "An opaque token representing the pagination position after the last returned result.\nIf present, there may be more results available.",
"type": "string"
},
"tasks": {
"items": {
"$ref": "#/$defs/Task"
},
"type": "array"
}
},
"required": ["tasks"],
"type": "object"
},
"TaskStatusNotificationParams": {
"allOf": [
{
"$ref": "https://raw.githubusercontent.com/modelcontextprotocol/modelcontextprotocol/main/schema/2025-11-25/schema.json#/$defs/NotificationParams"
},
{
"$ref": "#/$defs/Task"
}
],
"description": "Parameters for a `notifications/tasks/status` notification."
},
"TaskStatusNotification": {
"description": "An optional notification from the receiver to the requestor, informing them that a task's status has changed. Receivers are not required to send these notifications.",
"properties": {
"jsonrpc": {
"const": "2.0",
"type": "string"
},
"method": {
"const": "notifications/tasks/status",
"type": "string"
},
"params": {
"$ref": "#/$defs/TaskStatusNotificationParams"
}
},
"required": ["jsonrpc", "method", "params"],
"type": "object"
},
"TaskServerCapabilities": {
"description": "Task-related server capabilities. Include this in the server's capabilities object during initialization.",
"properties": {
"tasks": {
"properties": {
"list": {
"description": "Whether this server supports tasks/list.",
"type": "object"
},
"cancel": {
"description": "Whether this server supports tasks/cancel.",
"type": "object"
},
"requests": {
"properties": {
"tools": {
"properties": {
"call": {
"description": "Whether the server supports task-augmented tools/call requests.",
"type": "object"
}
},
"type": "object"
}
},
"type": "object"
}
},
"type": "object"
}
},
"type": "object"
},
"TaskClientCapabilities": {
"description": "Task-related client capabilities. Include this in the client's capabilities object during initialization.",
"properties": {
"tasks": {
"properties": {
"list": {
"description": "Whether this client supports tasks/list.",
"type": "object"
},
"cancel": {
"description": "Whether this client supports tasks/cancel.",
"type": "object"
},
"requests": {
"properties": {
"sampling": {
"properties": {
"createMessage": {
"description": "Whether the client supports task-augmented sampling/createMessage requests.",
"type": "object"
}
},
"type": "object"
},
"elicitation": {
"properties": {
"create": {
"description": "Whether the client supports task-augmented elicitation/create requests.",
"type": "object"
}
},
"type": "object"
}
},
"type": "object"
}
},
"type": "object"
}
},
"type": "object"
},
"ToolTaskSupport": {
"description": "Task support declaration for individual tools.\n- \"forbidden\": Tool does not support task-augmented execution (default when absent)\n- \"optional\": Tool may support task-augmented execution\n- \"required\": Tool requires task-augmented execution",
"enum": ["forbidden", "optional", "required"],
"type": "string"
}
}
}

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/**
* Schema Generation Script using ts-to-zod as a library
*
* This script generates Zod schemas from schema.ts and performs necessary
* post-processing for compatibility with this project.
*
* Follows the same pattern as ext-apps/scripts/generate-schemas.ts.
*
* ## Post-Processing Steps
*
* ### 1. Zod Import Path (`"zod"` → `"zod/v4"`)
* ts-to-zod generates `import { z } from "zod"`. We rewrite to `import { z } from "zod/v4"`
* to match MCP SDK's zod/v4 schemas.
*
* ### 2. External Type References (`z.any()` → SDK schemas)
* ts-to-zod cannot resolve types imported from @modelcontextprotocol/sdk.
* We replace z.any() placeholders with actual SDK schema imports.
*
* ### 3. Index Signatures (`z.record().and()` → `.passthrough()`)
* TypeScript index signatures are translated to z.record().and(z.object({...})).
* We replace with z.object({...}).passthrough() for compatibility.
*
* @see https://github.com/fabien0102/ts-to-zod
*/
import { readFileSync, writeFileSync, existsSync } from "node:fs";
import { dirname, join, relative } from "node:path";
import { fileURLToPath } from "node:url";
import { generate } from "ts-to-zod";
import { toJSONSchema, type $ZodType } from "zod/v4/core";
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
const PROJECT_ROOT = join(__dirname, "..");
const SCHEMA_DIR = join(PROJECT_ROOT, "schema", "draft", "2025-11-25");
const SPEC_TYPES_FILE = join(SCHEMA_DIR, "schema.ts");
const GENERATED_DIR = join(SCHEMA_DIR, "generated");
const SCHEMA_OUTPUT_FILE = join(GENERATED_DIR, "schema.ts");
const JSON_SCHEMA_OUTPUT_FILE = join(SCHEMA_DIR, "schema.json");
/**
* Mapping from ts-to-zod generated placeholder names to actual SDK schema exports.
* Only includes types that have matching SDK exports.
*/
const EXTERNAL_TYPE_SCHEMAS: string[] = [
"JSONRPCRequestSchema",
"JSONRPCNotificationSchema",
"PaginatedRequestSchema",
"PaginatedResultSchema",
"ResultSchema",
"RequestIdSchema",
"ProgressTokenSchema",
"CursorSchema",
];
/**
* External types that don't have direct SDK schema exports.
* We replace their z.any() placeholders with local Zod definitions.
*/
const LOCAL_SCHEMA_REPLACEMENTS: Record<string, string> = {
RequestParamsSchema: `z.object({
_meta: z.object({ progressToken: ProgressTokenSchema.optional() }).passthrough().optional(),
}).passthrough()`,
NotificationParamsSchema: `z.object({
_meta: z.record(z.string(), z.unknown()).optional(),
}).passthrough()`,
};
async function main() {
const isCheck = process.argv.includes("--check");
if (isCheck) {
console.log("Checking schemas...");
} else {
console.log("🔧 Generating Zod schemas from schema.ts...\n");
}
const sourceText = readFileSync(SPEC_TYPES_FILE, "utf-8");
const result = generate({
sourceText,
keepComments: true,
skipParseJSDoc: false,
getSchemaName: (typeName: string) => `${typeName}Schema`,
});
if (result.errors.length > 0) {
console.error("❌ Generation errors:");
for (const error of result.errors) {
console.error(` - ${error}`);
}
process.exit(1);
}
if (result.hasCircularDependencies) {
console.warn("⚠️ Warning: Circular dependencies detected in types");
}
// Generate Zod schemas file
const relativeImportPath = relative(GENERATED_DIR, SCHEMA_DIR).replace(
/\\/g,
"/"
);
let schemasContent = result.getZodSchemasFile(
`${relativeImportPath}/schema.js`
);
schemasContent = postProcess(schemasContent);
if (isCheck) {
// Check mode: compare generated output against existing files
let hasChanges = false;
if (existsSync(SCHEMA_OUTPUT_FILE)) {
const existing = readFileSync(SCHEMA_OUTPUT_FILE, "utf-8");
if (existing !== schemasContent) {
console.error(
"❌ Generated Zod schemas are out of date. Run: npm run generate:schemas"
);
hasChanges = true;
} else {
console.log(" ✓ Zod schemas are up to date");
}
} else {
console.error(
"❌ Generated Zod schemas file does not exist. Run: npm run generate:schemas"
);
hasChanges = true;
}
// Write temp file to generate JSON Schema for comparison
const tempFile = SCHEMA_OUTPUT_FILE + ".check.ts";
writeFileSync(tempFile, schemasContent, "utf-8");
try {
const jsonSchemaContent = await generateJsonSchemaContent(tempFile);
if (existsSync(JSON_SCHEMA_OUTPUT_FILE)) {
const existing = readFileSync(JSON_SCHEMA_OUTPUT_FILE, "utf-8");
if (existing !== jsonSchemaContent) {
console.error(
"❌ JSON Schema is out of date. Run: npm run generate:schemas"
);
hasChanges = true;
} else {
console.log(" ✓ JSON Schema is up to date");
}
} else {
console.error(
"❌ JSON Schema file does not exist. Run: npm run generate:schemas"
);
hasChanges = true;
}
} finally {
// Clean up temp file
const { unlinkSync } = await import("node:fs");
try {
unlinkSync(tempFile);
} catch {}
}
if (hasChanges) {
process.exit(1);
}
console.log("\nAll schemas are up to date!");
return;
}
// Write Zod schemas
writeFileSync(SCHEMA_OUTPUT_FILE, schemasContent, "utf-8");
console.log(`✅ Written: ${SCHEMA_OUTPUT_FILE}`);
// Generate and write JSON Schema
const jsonSchemaContent = await generateJsonSchemaContent(SCHEMA_OUTPUT_FILE);
writeFileSync(JSON_SCHEMA_OUTPUT_FILE, jsonSchemaContent, "utf-8");
console.log(`✅ Written: ${JSON_SCHEMA_OUTPUT_FILE}`);
console.log("\n🎉 Schema generation complete!");
}
/**
* Generate JSON Schema content from the Zod schemas file.
*/
async function generateJsonSchemaContent(
zodSchemasFile: string
): Promise<string> {
// Convert to file:// URL for dynamic import (required on Windows)
const fileUrl = new URL(`file:///${zodSchemasFile.replace(/\\/g, "/")}`);
const schemas = await import(fileUrl.href);
const jsonSchema: {
$schema: string;
$id: string;
title: string;
description: string;
$defs: Record<string, unknown>;
} = {
$schema: "https://json-schema.org/draft/2020-12/schema",
$id: "https://modelcontextprotocol.io/ext-tasks/schema.json",
title: "MCP Tasks Extension",
description:
"JSON Schema for MCP Tasks extension protocol messages. Extension Identifier: io.modelcontextprotocol/tasks",
$defs: {},
};
for (const [name, schema] of Object.entries(schemas)) {
if (
name.endsWith("Schema") &&
typeof schema === "object" &&
schema !== null
) {
const typeName = name.replace(/Schema$/, "");
// Skip SDK external types and local replacement types — only include task-specific types
if (
EXTERNAL_TYPE_SCHEMAS.includes(name) ||
name in LOCAL_SCHEMA_REPLACEMENTS
) {
continue;
}
try {
jsonSchema.$defs[typeName] = toJSONSchema(schema as $ZodType, {
unrepresentable: "any",
});
} catch (error) {
console.warn(`⚠️ Could not convert ${name} to JSON Schema: ${error}`);
}
}
}
return JSON.stringify(jsonSchema, null, 2) + "\n";
}
/**
* Post-process generated Zod schemas for project compatibility.
*/
function postProcess(content: string): string {
// 1. Rewrite to zod/v4 and add MCP SDK schema imports
const sdkImports = EXTERNAL_TYPE_SCHEMAS.join(",\n ");
content = content.replace(
'import { z } from "zod";',
`import { z } from "zod/v4";
import {
${sdkImports},
} from "@modelcontextprotocol/sdk/types.js";`
);
// 2. Remove z.any() placeholders for SDK-imported external types
for (const schemaName of EXTERNAL_TYPE_SCHEMAS) {
content = content.replace(
new RegExp(
`(?:export )?const ${schemaName} = z\\.any\\(\\);\\n?`,
"g"
),
""
);
}
// 3. Replace z.any() placeholders for locally-defined types
for (const [schemaName, replacement] of Object.entries(
LOCAL_SCHEMA_REPLACEMENTS
)) {
content = content.replace(
new RegExp(
`(?:export )?const ${schemaName} = z\\.any\\(\\);`,
"g"
),
`const ${schemaName} = ${replacement};`
);
}
// 4. Replace z.record().and(z.object({...})) with z.object({...}).passthrough()
content = replaceRecordAndWithPassthrough(content);
// 5. Add header comment
content = content.replace(
"// Generated by ts-to-zod",
`// Generated by ts-to-zod
// Post-processed for Zod v4 compatibility and MCP SDK integration
// Run: npm run generate:schemas`
);
return content;
}
/**
* Replace z.record(z.string(), z.unknown()).and(z.object({...})) with z.object({...}).passthrough()
* Uses brace-counting to handle nested objects correctly.
* passthrough() works in both Zod v3 and v4, allowing extra properties.
*/
function replaceRecordAndWithPassthrough(content: string): string {
const pattern = "z.record(z.string(), z.unknown()).and(z.object({";
let result = content;
let startIndex = 0;
while (true) {
const matchStart = result.indexOf(pattern, startIndex);
if (matchStart === -1) break;
const objectStart = matchStart + pattern.length;
let braceCount = 1;
let i = objectStart;
while (i < result.length && braceCount > 0) {
if (result[i] === "{") braceCount++;
else if (result[i] === "}") braceCount--;
i++;
}
if (result.slice(i, i + 2) === "))") {
const objectContent = result.slice(objectStart, i - 1);
const replacement = `z.object({${objectContent}}).passthrough()`;
result = result.slice(0, matchStart) + replacement + result.slice(i + 2);
startIndex = matchStart + replacement.length;
} else {
startIndex = i;
}
}
return result;
}
main().catch((error) => {
console.error("❌ Schema generation failed:", error);
process.exit(1);
});

View file

@ -7,5 +7,6 @@
"moduleResolution": "node",
"skipLibCheck": true
},
"include": ["schema/**/*.ts"]
"include": ["schema/**/*.ts"],
"exclude": ["schema/**/generated/**"]
}