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# Task ID: 78
**Title:** Create ProxyModel YAML Schema and Loader
**Status:** done
**Dependencies:** 71 ✓
**Priority:** high
**Description:** Define the YAML schema for proxymodel definitions and implement the loader that reads from ~/.mcpctl/proxymodels/ and merges with built-ins.
**Details:**
Create `src/mcplocal/src/proxymodel/schema.ts`:
```typescript
import { z } from 'zod';
export const ProxyModelSchema = z.object({
kind: z.literal('ProxyModel'),
metadata: z.object({
name: z.string(),
}),
spec: z.object({
controller: z.string().optional().default('gate'),
controllerConfig: z.record(z.unknown()).optional(),
stages: z.array(z.object({
type: z.string(),
config: z.record(z.unknown()).optional(),
})),
appliesTo: z.array(z.enum(['prompts', 'toolResults', 'resource'])).optional(),
cacheable: z.boolean().optional().default(true),
}),
});
export type ProxyModelDefinition = z.infer<typeof ProxyModelSchema>;
```
Create `src/mcplocal/src/proxymodel/loader.ts`:
```typescript
import { readdir, readFile } from 'fs/promises';
import { join } from 'path';
import { parse as parseYaml } from 'yaml';
import { ProxyModelSchema, type ProxyModelDefinition } from './schema';
import { getBuiltInProxyModels } from './built-in-models';
const PROXYMODELS_DIR = join(process.env.HOME ?? '', '.mcpctl', 'proxymodels');
export async function loadProxyModels(): Promise<Map<string, ProxyModelDefinition>> {
const models = new Map<string, ProxyModelDefinition>();
// Load built-ins first
for (const [name, model] of getBuiltInProxyModels()) {
models.set(name, model);
}
// Load local (overrides built-ins)
try {
const files = await readdir(PROXYMODELS_DIR);
for (const file of files.filter(f => f.endsWith('.yaml') || f.endsWith('.yml'))) {
const content = await readFile(join(PROXYMODELS_DIR, file), 'utf-8');
const parsed = parseYaml(content);
const validated = ProxyModelSchema.parse(parsed);
models.set(validated.metadata.name, validated);
}
} catch (e) {
// Directory doesn't exist or can't be read - use built-ins only
}
return models;
}
```
**Test Strategy:**
Unit tests: valid YAML parses correctly, invalid YAML throws validation error, local models override built-ins with same name, missing directory doesn't throw. Create test fixtures for various YAML configurations.