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* Model registry - manages built-in and custom models, provides API key resolution.\n */\n\nimport {\n\ttype AnthropicMessagesCompat,\n\ttype Api,\n\ttype AssistantMessageEventStream,\n\ttype Context,\n\tgetModels,\n\tgetProviders,\n\ttype KnownProvider,\n\ttype Model,\n\ttype OAuthProviderInterface,\n\ttype OpenAICompletionsCompat,\n\ttype OpenAIResponsesCompat,\n\tregisterApiProvider,\n\tresetApiProviders,\n\ttype SimpleStreamOptions,\n} from \"@earendil-works/pi-ai\";\nimport { registerOAuthProvider, resetOAuthProviders } from \"@earendil-works/pi-ai/oauth\";\nimport { existsSync, readFileSync } from \"fs\";\nimport { join } from \"path\";\nimport { type Static, Type } from \"typebox\";\nimport { Compile } from \"typebox/compile\";\nimport type { TLocalizedValidationError } from \"typebox/error\";\nimport { getAgentDir } from \"../config.js\";\nimport type { AuthStatus, AuthStorage } from \"./auth-storage.js\";\nimport { BUILT_IN_PROVIDER_DISPLAY_NAMES } from \"./provider-display-names.js\";\nimport {\n\tclearConfigValueCache,\n\tresolveConfigValueOrThrow,\n\tresolveConfigValueUncached,\n\tresolveHeadersOrThrow,\n} from \"./resolve-config-value.js\";\n\n// Schema for OpenRouter routing preferences\nconst PercentileCutoffsSchema = Type.Object({\n\tp50: Type.Optional(Type.Number()),\n\tp75: Type.Optional(Type.Number()),\n\tp90: Type.Optional(Type.Number()),\n\tp99: Type.Optional(Type.Number()),\n});\n\nconst OpenRouterRoutingSchema = Type.Object({\n\tallow_fallbacks: Type.Optional(Type.Boolean()),\n\trequire_parameters: Type.Optional(Type.Boolean()),\n\tdata_collection: Type.Optional(Type.Union([Type.Literal(\"deny\"), Type.Literal(\"allow\")])),\n\tzdr: Type.Optional(Type.Boolean()),\n\tenforce_distillable_text: Type.Optional(Type.Boolean()),\n\torder: Type.Optional(Type.Array(Type.String())),\n\tonly: Type.Optional(Type.Array(Type.String())),\n\tignore: Type.Optional(Type.Array(Type.String())),\n\tquantizations: Type.Optional(Type.Array(Type.String())),\n\tsort: Type.Optional(\n\t\tType.Union([\n\t\t\tType.String(),\n\t\t\tType.Object({\n\t\t\t\tby: Type.Optional(Type.String()),\n\t\t\t\tpartition: Type.Optional(Type.Union([Type.String(), Type.Null()])),\n\t\t\t}),\n\t\t]),\n\t),\n\tmax_price: Type.Optional(\n\t\tType.Object({\n\t\t\tprompt: Type.Optional(Type.Union([Type.Number(), Type.String()])),\n\t\t\tcompletion: Type.Optional(Type.Union([Type.Number(), Type.String()])),\n\t\t\timage: Type.Optional(Type.Union([Type.Number(), Type.String()])),\n\t\t\taudio: Type.Optional(Type.Union([Type.Number(), Type.String()])),\n\t\t\trequest: Type.Optional(Type.Union([Type.Number(), Type.String()])),\n\t\t}),\n\t),\n\tpreferred_min_throughput: Type.Optional(Type.Union([Type.Number(), PercentileCutoffsSchema])),\n\tpreferred_max_latency: Type.Optional(Type.Union([Type.Number(), PercentileCutoffsSchema])),\n});\n\n// Schema for Vercel AI Gateway routing preferences\nconst VercelGatewayRoutingSchema = Type.Object({\n\tonly: Type.Optional(Type.Array(Type.String())),\n\torder: Type.Optional(Type.Array(Type.String())),\n});\n\n// Schema for thinking level support and provider-specific values\nconst ThinkingLevelMapValueSchema = Type.Union([Type.String(), Type.Null()]);\nconst ThinkingLevelMapSchema = Type.Object({\n\toff: Type.Optional(ThinkingLevelMapValueSchema),\n\tminimal: Type.Optional(ThinkingLevelMapValueSchema),\n\tlow: Type.Optional(ThinkingLevelMapValueSchema),\n\tmedium: Type.Optional(ThinkingLevelMapValueSchema),\n\thigh: Type.Optional(ThinkingLevelMapValueSchema),\n\txhigh: Type.Optional(ThinkingLevelMapValueSchema),\n});\n\nconst OpenAICompletionsCompatSchema = Type.Object({\n\tsupportsStore: Type.Optional(Type.Boolean()),\n\tsupportsDeveloperRole: Type.Optional(Type.Boolean()),\n\tsupportsReasoningEffort: Type.Optional(Type.Boolean()),\n\tsupportsUsageInStreaming: Type.Optional(Type.Boolean()),\n\tmaxTokensField: Type.Optional(Type.Union([Type.Literal(\"max_completion_tokens\"), Type.Literal(\"max_tokens\")])),\n\trequiresToolResultName: Type.Optional(Type.Boolean()),\n\trequiresAssistantAfterToolResult: Type.Optional(Type.Boolean()),\n\trequiresThinkingAsText: Type.Optional(Type.Boolean()),\n\trequiresReasoningContentOnAssistantMessages: Type.Optional(Type.Boolean()),\n\tthinkingFormat: Type.Optional(\n\t\tType.Union([\n\t\t\tType.Literal(\"openai\"),\n\t\t\tType.Literal(\"openrouter\"),\n\t\t\tType.Literal(\"deepseek\"),\n\t\t\tType.Literal(\"zai\"),\n\t\t\tType.Literal(\"qwen\"),\n\t\t\tType.Literal(\"qwen-chat-template\"),\n\t\t]),\n\t),\n\tcacheControlFormat: Type.Optional(Type.Literal(\"anthropic\")),\n\topenRouterRouting: Type.Optional(OpenRouterRoutingSchema),\n\tvercelGatewayRouting: Type.Optional(VercelGatewayRoutingSchema),\n\tsupportsStrictMode: Type.Optional(Type.Boolean()),\n\tsupportsLongCacheRetention: Type.Optional(Type.Boolean()),\n});\n\nconst OpenAIResponsesCompatSchema = Type.Object({\n\tsendSessionIdHeader: Type.Optional(Type.Boolean()),\n\tsupportsLongCacheRetention: Type.Optional(Type.Boolean()),\n});\n\nconst AnthropicMessagesCompatSchema = Type.Object({\n\tsupportsEagerToolInputStreaming: Type.Optional(Type.Boolean()),\n\tsupportsLongCacheRetention: Type.Optional(Type.Boolean()),\n});\n\nconst ProviderCompatSchema = Type.Union([\n\tOpenAICompletionsCompatSchema,\n\tOpenAIResponsesCompatSchema,\n\tAnthropicMessagesCompatSchema,\n]);\n\n// Schema for custom model definition\n// Most fields are optional with sensible defaults for local models (Ollama, LM Studio, etc.)\nconst ModelDefinitionSchema = Type.Object({\n\tid: Type.String({ minLength: 1 }),\n\tname: Type.Optional(Type.String({ minLength: 1 })),\n\tapi: Type.Optional(Type.String({ minLength: 1 })),\n\tbaseUrl: Type.Optional(Type.String({ minLength: 1 })),\n\treasoning: Type.Optional(Type.Boolean()),\n\tthinkingLevelMap: Type.Optional(ThinkingLevelMapSchema),\n\tinput: Type.Optional(Type.Array(Type.Union([Type.Literal(\"text\"), Type.Literal(\"image\")]))),\n\tcost: Type.Optional(\n\t\tType.Object({\n\t\t\tinput: Type.Number(),\n\t\t\toutput: Type.Number(),\n\t\t\tcacheRead: Type.Number(),\n\t\t\tcacheWrite: Type.Number(),\n\t\t}),\n\t),\n\tcontextWindow: Type.Optional(Type.Number()),\n\tmaxTokens: Type.Optional(Type.Number()),\n\theaders: Type.Optional(Type.Record(Type.String(), Type.String())),\n\tcompat: Type.Optional(ProviderCompatSchema),\n});\n\n// Schema for per-model overrides (all fields optional, merged with built-in model)\nconst ModelOverrideSchema = Type.Object({\n\tname: Type.Optional(Type.String({ minLength: 1 })),\n\treasoning: Type.Optional(Type.Boolean()),\n\tthinkingLevelMap: Type.Optional(ThinkingLevelMapSchema),\n\tinput: Type.Optional(Type.Array(Type.Union([Type.Literal(\"text\"), Type.Literal(\"image\")]))),\n\tcost: Type.Optional(\n\t\tType.Object({\n\t\t\tinput: Type.Optional(Type.Number()),\n\t\t\toutput: Type.Optional(Type.Number()),\n\t\t\tcacheRead: Type.Optional(Type.Number()),\n\t\t\tcacheWrite: Type.Optional(Type.Number()),\n\t\t}),\n\t),\n\tcontextWindow: Type.Optional(Type.Number()),\n\tmaxTokens: Type.Optional(Type.Number()),\n\theaders: Type.Optional(Type.Record(Type.String(), Type.String())),\n\tcompat: Type.Optional(ProviderCompatSchema),\n});\n\ntype ModelOverride = Static<typeof ModelOverrideSchema>;\n\nconst ProviderConfigSchema = Type.Object({\n\tname: Type.Optional(Type.String({ minLength: 1 })),\n\tbaseUrl: Type.Optional(Type.String({ minLength: 1 })),\n\tapiKey: Type.Optional(Type.String({ minLength: 1 })),\n\tapi: Type.Optional(Type.String({ minLength: 1 })),\n\theaders: Type.Optional(Type.Record(Type.String(), Type.String())),\n\tcompat: Type.Optional(ProviderCompatSchema),\n\tauthHeader: Type.Optional(Type.Boolean()),\n\tmodels: Type.Optional(Type.Array(ModelDefinitionSchema)),\n\tmodelOverrides: Type.Optional(Type.Record(Type.String(), ModelOverrideSchema)),\n});\n\nconst ModelsConfigSchema = Type.Object({\n\tproviders: Type.Record(Type.String(), ProviderConfigSchema),\n});\n\nconst validateModelsConfig = Compile(ModelsConfigSchema);\n\ntype ModelsConfig = Static<typeof ModelsConfigSchema>;\n\nfunction formatValidationPath(error: TLocalizedValidationError): string {\n\tif (error.keyword === \"required\") {\n\t\tconst requiredProperties = (error.params as { requiredProperties?: string[] }).requiredProperties;\n\t\tconst requiredProperty = requiredProperties?.[0];\n\t\tif (requiredProperty) {\n\t\t\tconst basePath = error.instancePath.replace(/^\\//, \"\").replace(/\\//g, \".\");\n\t\t\treturn basePath ? `${basePath}.${requiredProperty}` : requiredProperty;\n\t\t}\n\t}\n\tconst path = error.instancePath.replace(/^\\//, \"\").replace(/\\//g, \".\");\n\treturn path || \"root\";\n}\n\n/** Strip `//` line comments and trailing commas from JSON, leaving string literals untouched. */\nfunction stripJsonComments(input: string): string {\n\treturn input\n\t\t.replace(/\"(?:\\\\.|[^\"\\\\])*\"|\\/\\/[^\\n]*/g, (m) => (m[0] === '\"' ? m : \"\"))\n\t\t.replace(/\"(?:\\\\.|[^\"\\\\])*\"|,(\\s*[}\\]])/g, (m, tail) => tail ?? (m[0] === '\"' ? m : \"\"));\n}\n\n/** Provider override config (baseUrl, compat) without request auth/headers */\ninterface ProviderOverride {\n\tbaseUrl?: string;\n\tcompat?: Model<Api>[\"compat\"];\n}\n\ninterface ProviderRequestConfig {\n\tapiKey?: string;\n\theaders?: Record<string, string>;\n\tauthHeader?: boolean;\n}\n\nexport type ResolvedRequestAuth =\n\t| {\n\t\t\tok: true;\n\t\t\tapiKey?: string;\n\t\t\theaders?: Record<string, string>;\n\t  }\n\t| {\n\t\t\tok: false;\n\t\t\terror: string;\n\t  };\n\n/** Result of loading custom models from models.json */\ninterface CustomModelsResult {\n\tmodels: Model<Api>[];\n\t/** Providers with baseUrl/headers/apiKey overrides for built-in models */\n\toverrides: Map<string, ProviderOverride>;\n\t/** Per-model overrides: provider -> modelId -> override */\n\tmodelOverrides: Map<string, Map<string, ModelOverride>>;\n\terror: string | undefined;\n}\n\nfunction emptyCustomModelsResult(error?: string): CustomModelsResult {\n\treturn { models: [], overrides: new Map(), modelOverrides: new Map(), error };\n}\n\nfunction mergeCompat(\n\tbaseCompat: Model<Api>[\"compat\"],\n\toverrideCompat: ModelOverride[\"compat\"],\n): Model<Api>[\"compat\"] | undefined {\n\tif (!overrideCompat) return baseCompat;\n\n\tconst base = baseCompat as OpenAICompletionsCompat | OpenAIResponsesCompat | AnthropicMessagesCompat | undefined;\n\tconst override = overrideCompat as OpenAICompletionsCompat | OpenAIResponsesCompat | AnthropicMessagesCompat;\n\tconst merged = { ...base, ...override } as OpenAICompletionsCompat | OpenAIResponsesCompat | AnthropicMessagesCompat;\n\n\tconst baseCompletions = base as OpenAICompletionsCompat | undefined;\n\tconst overrideCompletions = override as OpenAICompletionsCompat;\n\tconst mergedCompletions = merged as OpenAICompletionsCompat;\n\n\tif (baseCompletions?.openRouterRouting || overrideCompletions.openRouterRouting) {\n\t\tmergedCompletions.openRouterRouting = {\n\t\t\t...baseCompletions?.openRouterRouting,\n\t\t\t...overrideCompletions.openRouterRouting,\n\t\t};\n\t}\n\n\tif (baseCompletions?.vercelGatewayRouting || overrideCompletions.vercelGatewayRouting) {\n\t\tmergedCompletions.vercelGatewayRouting = {\n\t\t\t...baseCompletions?.vercelGatewayRouting,\n\t\t\t...overrideCompletions.vercelGatewayRouting,\n\t\t};\n\t}\n\n\treturn merged as Model<Api>[\"compat\"];\n}\n\n/**\n * Deep merge a model override into a model.\n * Handles nested objects (cost, compat) by merging rather than replacing.\n */\nfunction applyModelOverride(model: Model<Api>, override: ModelOverride): Model<Api> {\n\tconst result = { ...model };\n\n\t// Simple field overrides\n\tif (override.name !== undefined) result.name = override.name;\n\tif (override.reasoning !== undefined) result.reasoning = override.reasoning;\n\tif (override.thinkingLevelMap !== undefined) {\n\t\tresult.thinkingLevelMap = { ...model.thinkingLevelMap, ...override.thinkingLevelMap };\n\t}\n\tif (override.input !== undefined) result.input = override.input as (\"text\" | \"image\")[];\n\tif (override.contextWindow !== undefined) result.contextWindow = override.contextWindow;\n\tif (override.maxTokens !== undefined) result.maxTokens = override.maxTokens;\n\n\t// Merge cost (partial override)\n\tif (override.cost) {\n\t\tresult.cost = {\n\t\t\tinput: override.cost.input ?? model.cost.input,\n\t\t\toutput: override.cost.output ?? model.cost.output,\n\t\t\tcacheRead: override.cost.cacheRead ?? model.cost.cacheRead,\n\t\t\tcacheWrite: override.cost.cacheWrite ?? model.cost.cacheWrite,\n\t\t};\n\t}\n\n\t// Deep merge compat\n\tresult.compat = mergeCompat(model.compat, override.compat);\n\n\treturn result;\n}\n\n/** Clear the config value command cache. Exported for testing. */\nexport const clearApiKeyCache = clearConfigValueCache;\n\n/**\n * Model registry - loads and manages models, resolves API keys via AuthStorage.\n */\nexport class ModelRegistry {\n\tprivate models: Model<Api>[] = [];\n\tprivate providerRequestConfigs: Map<string, ProviderRequestConfig> = new Map();\n\tprivate modelRequestHeaders: Map<string, Record<string, string>> = new Map();\n\tprivate registeredProviders: Map<string, ProviderConfigInput> = new Map();\n\tprivate loadError: string | undefined = undefined;\n\n\tprivate constructor(\n\t\treadonly authStorage: AuthStorage,\n\t\tprivate modelsJsonPath: string | undefined,\n\t) {\n\t\tthis.loadModels();\n\t}\n\n\tstatic create(authStorage: AuthStorage, modelsJsonPath: string = join(getAgentDir(), \"models.json\")): ModelRegistry {\n\t\treturn new ModelRegistry(authStorage, modelsJsonPath);\n\t}\n\n\tstatic inMemory(authStorage: AuthStorage): ModelRegistry {\n\t\treturn new ModelRegistry(authStorage, undefined);\n\t}\n\n\t/**\n\t * Reload models from disk (built-in + custom from models.json).\n\t */\n\trefresh(): void {\n\t\tthis.providerRequestConfigs.clear();\n\t\tthis.modelRequestHeaders.clear();\n\t\tthis.loadError = undefined;\n\n\t\t// Ensure dynamic API/OAuth registrations are rebuilt from current provider state.\n\t\tresetApiProviders();\n\t\tresetOAuthProviders();\n\n\t\tthis.loadModels();\n\n\t\tfor (const [providerName, config] of this.registeredProviders.entries()) {\n\t\t\tthis.applyProviderConfig(providerName, config);\n\t\t}\n\t}\n\n\t/**\n\t * Get any error from loading models.json (undefined if no error).\n\t */\n\tgetError(): string | undefined {\n\t\treturn this.loadError;\n\t}\n\n\tprivate loadModels(): void {\n\t\t// Load custom models and overrides from models.json\n\t\tconst {\n\t\t\tmodels: customModels,\n\t\t\toverrides,\n\t\t\tmodelOverrides,\n\t\t\terror,\n\t\t} = this.modelsJsonPath ? this.loadCustomModels(this.modelsJsonPath) : emptyCustomModelsResult();\n\n\t\tif (error) {\n\t\t\tthis.loadError = error;\n\t\t\t// Keep built-in models even if custom models failed to load\n\t\t}\n\n\t\tconst builtInModels = this.loadBuiltInModels(overrides, modelOverrides);\n\t\tlet combined = this.mergeCustomModels(builtInModels, customModels);\n\n\t\t// Let OAuth providers modify their models (e.g., update baseUrl)\n\t\tfor (const oauthProvider of this.authStorage.getOAuthProviders()) {\n\t\t\tconst cred = this.authStorage.get(oauthProvider.id);\n\t\t\tif (cred?.type === \"oauth\" && oauthProvider.modifyModels) {\n\t\t\t\tcombined = oauthProvider.modifyModels(combined, cred);\n\t\t\t}\n\t\t}\n\n\t\tthis.models = combined;\n\t}\n\n\t/** Load built-in models and apply provider/model overrides */\n\tprivate loadBuiltInModels(\n\t\toverrides: Map<string, ProviderOverride>,\n\t\tmodelOverrides: Map<string, Map<string, ModelOverride>>,\n\t): Model<Api>[] {\n\t\treturn getProviders().flatMap((provider) => {\n\t\t\tconst models = getModels(provider as KnownProvider) as Model<Api>[];\n\t\t\tconst providerOverride = overrides.get(provider);\n\t\t\tconst perModelOverrides = modelOverrides.get(provider);\n\n\t\t\treturn models.map((m) => {\n\t\t\t\tlet model = m;\n\n\t\t\t\t// Apply provider-level baseUrl/headers/compat override\n\t\t\t\tif (providerOverride) {\n\t\t\t\t\tmodel = {\n\t\t\t\t\t\t...model,\n\t\t\t\t\t\tbaseUrl: providerOverride.baseUrl ?? model.baseUrl,\n\t\t\t\t\t\tcompat: mergeCompat(model.compat, providerOverride.compat),\n\t\t\t\t\t};\n\t\t\t\t}\n\n\t\t\t\t// Apply per-model override\n\t\t\t\tconst modelOverride = perModelOverrides?.get(m.id);\n\t\t\t\tif (modelOverride) {\n\t\t\t\t\tmodel = applyModelOverride(model, modelOverride);\n\t\t\t\t}\n\n\t\t\t\treturn model;\n\t\t\t});\n\t\t});\n\t}\n\n\t/** Merge custom models into built-in list by provider+id (custom wins on conflicts). */\n\tprivate mergeCustomModels(builtInModels: Model<Api>[], customModels: Model<Api>[]): Model<Api>[] {\n\t\tconst merged = [...builtInModels];\n\t\tfor (const customModel of customModels) {\n\t\t\tconst existingIndex = merged.findIndex((m) => m.provider === customModel.provider && m.id === customModel.id);\n\t\t\tif (existingIndex >= 0) {\n\t\t\t\tmerged[existingIndex] = customModel;\n\t\t\t} else {\n\t\t\t\tmerged.push(customModel);\n\t\t\t}\n\t\t}\n\t\treturn merged;\n\t}\n\n\tprivate loadCustomModels(modelsJsonPath: string): CustomModelsResult {\n\t\tif (!existsSync(modelsJsonPath)) {\n\t\t\treturn emptyCustomModelsResult();\n\t\t}\n\n\t\ttry {\n\t\t\tconst content = readFileSync(modelsJsonPath, \"utf-8\");\n\t\t\tconst parsed = JSON.parse(stripJsonComments(content)) as unknown;\n\n\t\t\tif (!validateModelsConfig.Check(parsed)) {\n\t\t\t\tconst errors =\n\t\t\t\t\tvalidateModelsConfig\n\t\t\t\t\t\t.Errors(parsed)\n\t\t\t\t\t\t.map((error) => `  - ${formatValidationPath(error)}: ${error.message}`)\n\t\t\t\t\t\t.join(\"\\n\") || \"Unknown schema error\";\n\t\t\t\treturn emptyCustomModelsResult(`Invalid models.json schema:\\n${errors}\\n\\nFile: ${modelsJsonPath}`);\n\t\t\t}\n\n\t\t\tconst config = parsed as ModelsConfig;\n\n\t\t\t// Additional validation\n\t\t\tthis.validateConfig(config);\n\n\t\t\tconst overrides = new Map<string, ProviderOverride>();\n\t\t\tconst modelOverrides = new Map<string, Map<string, ModelOverride>>();\n\n\t\t\tfor (const [providerName, providerConfig] of Object.entries(config.providers)) {\n\t\t\t\tif (providerConfig.baseUrl || providerConfig.compat) {\n\t\t\t\t\toverrides.set(providerName, {\n\t\t\t\t\t\tbaseUrl: providerConfig.baseUrl,\n\t\t\t\t\t\tcompat: providerConfig.compat,\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tthis.storeProviderRequestConfig(providerName, providerConfig);\n\n\t\t\t\tif (providerConfig.modelOverrides) {\n\t\t\t\t\tmodelOverrides.set(providerName, new Map(Object.entries(providerConfig.modelOverrides)));\n\t\t\t\t\tfor (const [modelId, modelOverride] of Object.entries(providerConfig.modelOverrides)) {\n\t\t\t\t\t\tthis.storeModelHeaders(providerName, modelId, modelOverride.headers);\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn { models: this.parseModels(config), overrides, modelOverrides, error: undefined };\n\t\t} catch (error) {\n\t\t\tif (error instanceof SyntaxError) {\n\t\t\t\treturn emptyCustomModelsResult(`Failed to parse models.json: ${error.message}\\n\\nFile: ${modelsJsonPath}`);\n\t\t\t}\n\t\t\treturn emptyCustomModelsResult(\n\t\t\t\t`Failed to load models.json: ${error instanceof Error ? error.message : error}\\n\\nFile: ${modelsJsonPath}`,\n\t\t\t);\n\t\t}\n\t}\n\n\tprivate validateConfig(config: ModelsConfig): void {\n\t\tconst builtInProviders = new Set<string>(getProviders());\n\n\t\tfor (const [providerName, providerConfig] of Object.entries(config.providers)) {\n\t\t\tconst isBuiltIn = builtInProviders.has(providerName);\n\t\t\tconst hasProviderApi = !!providerConfig.api;\n\t\t\tconst models = providerConfig.models ?? [];\n\t\t\tconst hasModelOverrides =\n\t\t\t\tproviderConfig.modelOverrides && Object.keys(providerConfig.modelOverrides).length > 0;\n\n\t\t\tif (models.length === 0) {\n\t\t\t\t// Override-only config: needs baseUrl, headers, compat, modelOverrides, or some combination.\n\t\t\t\tif (!providerConfig.baseUrl && !providerConfig.headers && !providerConfig.compat && !hasModelOverrides) {\n\t\t\t\t\tthrow new Error(\n\t\t\t\t\t\t`Provider ${providerName}: must specify \"baseUrl\", \"headers\", \"compat\", \"modelOverrides\", or \"models\".`,\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t} else if (!isBuiltIn) {\n\t\t\t\t// Non-built-in providers with custom models require endpoint + auth.\n\t\t\t\tif (!providerConfig.baseUrl) {\n\t\t\t\t\tthrow new Error(`Provider ${providerName}: \"baseUrl\" is required when defining custom models.`);\n\t\t\t\t}\n\t\t\t\tif (!providerConfig.apiKey) {\n\t\t\t\t\tthrow new Error(`Provider ${providerName}: \"apiKey\" is required when defining custom models.`);\n\t\t\t\t}\n\t\t\t}\n\t\t\t// Built-in providers with custom models: baseUrl/apiKey/api are optional,\n\t\t\t// inherited from built-in models. Auth comes from env vars / auth storage.\n\n\t\t\tfor (const modelDef of models) {\n\t\t\t\tconst hasModelApi = !!modelDef.api;\n\n\t\t\t\tif (!hasProviderApi && !hasModelApi && !isBuiltIn) {\n\t\t\t\t\tthrow new Error(\n\t\t\t\t\t\t`Provider ${providerName}, model ${modelDef.id}: no \"api\" specified. Set at provider or model level.`,\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t\t// For built-in providers, api is optional — inherited from built-in models.\n\n\t\t\t\tif (!modelDef.id) throw new Error(`Provider ${providerName}: model missing \"id\"`);\n\t\t\t\t// Validate contextWindow/maxTokens only if provided (they have defaults)\n\t\t\t\tif (modelDef.contextWindow !== undefined && modelDef.contextWindow <= 0)\n\t\t\t\t\tthrow new Error(`Provider ${providerName}, model ${modelDef.id}: invalid contextWindow`);\n\t\t\t\tif (modelDef.maxTokens !== undefined && modelDef.maxTokens <= 0)\n\t\t\t\t\tthrow new Error(`Provider ${providerName}, model ${modelDef.id}: invalid maxTokens`);\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate parseModels(config: ModelsConfig): Model<Api>[] {\n\t\tconst models: Model<Api>[] = [];\n\t\tconst builtInProviders = new Set<string>(getProviders());\n\n\t\t// Cache built-in defaults (api, baseUrl) per provider, extracted from first model.\n\t\tconst builtInDefaultsCache = new Map<string, { api: string; baseUrl: string }>();\n\t\tconst getBuiltInDefaults = (providerName: string): { api: string; baseUrl: string } | undefined => {\n\t\t\tif (!builtInProviders.has(providerName)) return undefined;\n\t\t\tif (builtInDefaultsCache.has(providerName)) return builtInDefaultsCache.get(providerName);\n\t\t\tconst builtIn = getModels(providerName as KnownProvider) as Model<Api>[];\n\t\t\tif (builtIn.length === 0) return undefined;\n\t\t\tconst defaults = { api: builtIn[0].api, baseUrl: builtIn[0].baseUrl };\n\t\t\tbuiltInDefaultsCache.set(providerName, defaults);\n\t\t\treturn defaults;\n\t\t};\n\n\t\tfor (const [providerName, providerConfig] of Object.entries(config.providers)) {\n\t\t\tconst modelDefs = providerConfig.models ?? [];\n\t\t\tif (modelDefs.length === 0) continue; // Override-only, no custom models\n\n\t\t\tconst builtInDefaults = getBuiltInDefaults(providerName);\n\n\t\t\tfor (const modelDef of modelDefs) {\n\t\t\t\tconst api = modelDef.api ?? providerConfig.api ?? builtInDefaults?.api;\n\t\t\t\tif (!api) continue;\n\n\t\t\t\tconst baseUrl = modelDef.baseUrl ?? providerConfig.baseUrl ?? builtInDefaults?.baseUrl;\n\t\t\t\tif (!baseUrl) continue;\n\n\t\t\t\tconst compat = mergeCompat(providerConfig.compat, modelDef.compat);\n\t\t\t\tthis.storeModelHeaders(providerName, modelDef.id, modelDef.headers);\n\n\t\t\t\tconst defaultCost = { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 };\n\t\t\t\tmodels.push({\n\t\t\t\t\tid: modelDef.id,\n\t\t\t\t\tname: modelDef.name ?? modelDef.id,\n\t\t\t\t\tapi: api as Api,\n\t\t\t\t\tprovider: providerName,\n\t\t\t\t\tbaseUrl,\n\t\t\t\t\treasoning: modelDef.reasoning ?? false,\n\t\t\t\t\tthinkingLevelMap: modelDef.thinkingLevelMap,\n\t\t\t\t\tinput: (modelDef.input ?? [\"text\"]) as (\"text\" | \"image\")[],\n\t\t\t\t\tcost: modelDef.cost ?? defaultCost,\n\t\t\t\t\tcontextWindow: modelDef.contextWindow ?? 128000,\n\t\t\t\t\tmaxTokens: modelDef.maxTokens ?? 16384,\n\t\t\t\t\theaders: undefined,\n\t\t\t\t\tcompat,\n\t\t\t\t} as Model<Api>);\n\t\t\t}\n\t\t}\n\n\t\treturn models;\n\t}\n\n\t/**\n\t * Get all models (built-in + custom).\n\t * If models.json had errors, returns only built-in models.\n\t */\n\tgetAll(): Model<Api>[] {\n\t\treturn this.models;\n\t}\n\n\t/**\n\t * Get only models that have auth configured.\n\t * This is a fast check that doesn't refresh OAuth tokens.\n\t */\n\tgetAvailable(): Model<Api>[] {\n\t\treturn this.models.filter((m) => this.hasConfiguredAuth(m));\n\t}\n\n\t/**\n\t * Find a model by provider and ID.\n\t */\n\tfind(provider: string, modelId: string): Model<Api> | undefined {\n\t\treturn this.models.find((m) => m.provider === provider && m.id === modelId);\n\t}\n\n\t/**\n\t * Get API key for a model.\n\t */\n\thasConfiguredAuth(model: Model<Api>): boolean {\n\t\treturn (\n\t\t\tthis.authStorage.hasAuth(model.provider) ||\n\t\t\tthis.providerRequestConfigs.get(model.provider)?.apiKey !== undefined\n\t\t);\n\t}\n\n\tprivate getModelRequestKey(provider: string, modelId: string): string {\n\t\treturn `${provider}:${modelId}`;\n\t}\n\n\tprivate storeProviderRequestConfig(\n\t\tproviderName: string,\n\t\tconfig: {\n\t\t\tapiKey?: string;\n\t\t\theaders?: Record<string, string>;\n\t\t\tauthHeader?: boolean;\n\t\t},\n\t): void {\n\t\tif (!config.apiKey && !config.headers && !config.authHeader) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.providerRequestConfigs.set(providerName, {\n\t\t\tapiKey: config.apiKey,\n\t\t\theaders: config.headers,\n\t\t\tauthHeader: config.authHeader,\n\t\t});\n\t}\n\n\tprivate storeModelHeaders(providerName: string, modelId: string, headers?: Record<string, string>): void {\n\t\tconst key = this.getModelRequestKey(providerName, modelId);\n\t\tif (!headers || Object.keys(headers).length === 0) {\n\t\t\tthis.modelRequestHeaders.delete(key);\n\t\t\treturn;\n\t\t}\n\t\tthis.modelRequestHeaders.set(key, headers);\n\t}\n\n\t/**\n\t * Get API key and request headers for a model.\n\t */\n\tasync getApiKeyAndHeaders(model: Model<Api>): Promise<ResolvedRequestAuth> {\n\t\ttry {\n\t\t\tconst providerConfig = this.providerRequestConfigs.get(model.provider);\n\t\t\tconst apiKeyFromAuthStorage = await this.authStorage.getApiKey(model.provider, { includeFallback: false });\n\t\t\tconst apiKey =\n\t\t\t\tapiKeyFromAuthStorage ??\n\t\t\t\t(providerConfig?.apiKey\n\t\t\t\t\t? resolveConfigValueOrThrow(providerConfig.apiKey, `API key for provider \"${model.provider}\"`)\n\t\t\t\t\t: undefined);\n\n\t\t\tconst providerHeaders = resolveHeadersOrThrow(providerConfig?.headers, `provider \"${model.provider}\"`);\n\t\t\tconst modelHeaders = resolveHeadersOrThrow(\n\t\t\t\tthis.modelRequestHeaders.get(this.getModelRequestKey(model.provider, model.id)),\n\t\t\t\t`model \"${model.provider}/${model.id}\"`,\n\t\t\t);\n\n\t\t\tlet headers =\n\t\t\t\tmodel.headers || providerHeaders || modelHeaders\n\t\t\t\t\t? { ...model.headers, ...providerHeaders, ...modelHeaders }\n\t\t\t\t\t: undefined;\n\n\t\t\tif (providerConfig?.authHeader) {\n\t\t\t\tif (!apiKey) {\n\t\t\t\t\treturn { ok: false, error: `No API key found for \"${model.provider}\"` };\n\t\t\t\t}\n\t\t\t\theaders = { ...headers, Authorization: `Bearer ${apiKey}` };\n\t\t\t}\n\n\t\t\treturn {\n\t\t\t\tok: true,\n\t\t\t\tapiKey,\n\t\t\t\theaders: headers && Object.keys(headers).length > 0 ? headers : undefined,\n\t\t\t};\n\t\t} catch (error) {\n\t\t\treturn {\n\t\t\t\tok: false,\n\t\t\t\terror: error instanceof Error ? error.message : String(error),\n\t\t\t};\n\t\t}\n\t}\n\n\t/**\n\t * Return auth status for a provider, including request auth configured in models.json.\n\t * This intentionally does not execute command-backed config values.\n\t */\n\tgetProviderAuthStatus(provider: string): AuthStatus {\n\t\tconst authStatus = this.authStorage.getAuthStatus(provider);\n\t\tif (authStatus.source) {\n\t\t\treturn authStatus;\n\t\t}\n\n\t\tconst providerApiKey = this.providerRequestConfigs.get(provider)?.apiKey;\n\t\tif (!providerApiKey) {\n\t\t\treturn authStatus;\n\t\t}\n\n\t\tif (providerApiKey.startsWith(\"!\")) {\n\t\t\treturn { configured: true, source: \"models_json_command\" };\n\t\t}\n\n\t\tif (process.env[providerApiKey]) {\n\t\t\treturn { configured: true, source: \"environment\", label: providerApiKey };\n\t\t}\n\n\t\treturn { configured: true, source: \"models_json_key\" };\n\t}\n\n\t/**\n\t * Get display name for a provider.\n\t */\n\tgetProviderDisplayName(provider: string): string {\n\t\tconst registeredProvider = this.registeredProviders.get(provider);\n\t\tconst oauthProvider = this.authStorage.getOAuthProviders().find((p) => p.id === provider);\n\n\t\treturn (\n\t\t\tregisteredProvider?.name ??\n\t\t\tregisteredProvider?.oauth?.name ??\n\t\t\toauthProvider?.name ??\n\t\t\tBUILT_IN_PROVIDER_DISPLAY_NAMES[provider] ??\n\t\t\tprovider\n\t\t);\n\t}\n\n\t/**\n\t * Get API key for a provider.\n\t */\n\tasync getApiKeyForProvider(provider: string): Promise<string | undefined> {\n\t\tconst apiKey = await this.authStorage.getApiKey(provider, { includeFallback: false });\n\t\tif (apiKey !== undefined) {\n\t\t\treturn apiKey;\n\t\t}\n\n\t\tconst providerApiKey = this.providerRequestConfigs.get(provider)?.apiKey;\n\t\treturn providerApiKey ? resolveConfigValueUncached(providerApiKey) : undefined;\n\t}\n\n\t/**\n\t * Check if a model is using OAuth credentials (subscription).\n\t */\n\tisUsingOAuth(model: Model<Api>): boolean {\n\t\tconst cred = this.authStorage.get(model.provider);\n\t\treturn cred?.type === \"oauth\";\n\t}\n\n\t/**\n\t * Register a provider dynamically (from extensions).\n\t *\n\t * If provider has models: replaces all existing models for this provider.\n\t * If provider has only baseUrl/headers: overrides existing models' URLs.\n\t * If provider has oauth: registers OAuth provider for /login support.\n\t */\n\tregisterProvider(providerName: string, config: ProviderConfigInput): void {\n\t\tthis.validateProviderConfig(providerName, config);\n\t\tthis.applyProviderConfig(providerName, config);\n\t\tthis.upsertRegisteredProvider(providerName, config);\n\t}\n\n\t/**\n\t * Unregister a previously registered provider.\n\t *\n\t * Removes the provider from the registry and reloads models from disk so that\n\t * built-in models overridden by this provider are restored to their original state.\n\t * Also resets dynamic OAuth and API stream registrations before reapplying\n\t * remaining dynamic providers.\n\t * Has no effect if the provider was never registered.\n\t */\n\tunregisterProvider(providerName: string): void {\n\t\tif (!this.registeredProviders.has(providerName)) return;\n\t\tthis.registeredProviders.delete(providerName);\n\t\tthis.refresh();\n\t}\n\n\t/**\n\t * Upsert a provider config into registeredProviders.\n\t * If the provider is already registered, defined values in the incoming config\n\t * override existing ones; undefined values are preserved from the stored config.\n\t * If the provider is not registered, the incoming config is stored as-is.\n\t */\n\tprivate upsertRegisteredProvider(providerName: string, config: ProviderConfigInput): void {\n\t\tconst existing = this.registeredProviders.get(providerName);\n\t\tif (!existing) {\n\t\t\tthis.registeredProviders.set(providerName, config);\n\t\t\treturn;\n\t\t}\n\t\tfor (const k of Object.keys(config) as (keyof ProviderConfigInput)[]) {\n\t\t\tif (config[k] !== undefined) {\n\t\t\t\t(existing as Record<string, unknown>)[k] = config[k];\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate validateProviderConfig(providerName: string, config: ProviderConfigInput): void {\n\t\tif (config.streamSimple && !config.api) {\n\t\t\tthrow new Error(`Provider ${providerName}: \"api\" is required when registering streamSimple.`);\n\t\t}\n\n\t\tif (!config.models || config.models.length === 0) {\n\t\t\treturn;\n\t\t}\n\n\t\tif (!config.baseUrl) {\n\t\t\tthrow new Error(`Provider ${providerName}: \"baseUrl\" is required when defining models.`);\n\t\t}\n\t\tif (!config.apiKey && !config.oauth) {\n\t\t\tthrow new Error(`Provider ${providerName}: \"apiKey\" or \"oauth\" is required when defining models.`);\n\t\t}\n\n\t\tfor (const modelDef of config.models) {\n\t\t\tconst api = modelDef.api || config.api;\n\t\t\tif (!api) {\n\t\t\t\tthrow new Error(`Provider ${providerName}, model ${modelDef.id}: no \"api\" specified.`);\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate applyProviderConfig(providerName: string, config: ProviderConfigInput): void {\n\t\t// Register OAuth provider if provided\n\t\tif (config.oauth) {\n\t\t\t// Ensure the OAuth provider ID matches the provider name\n\t\t\tconst oauthProvider: OAuthProviderInterface = {\n\t\t\t\t...config.oauth,\n\t\t\t\tid: providerName,\n\t\t\t};\n\t\t\tregisterOAuthProvider(oauthProvider);\n\t\t}\n\n\t\tif (config.streamSimple) {\n\t\t\tconst streamSimple = config.streamSimple;\n\t\t\tregisterApiProvider(\n\t\t\t\t{\n\t\t\t\t\tapi: config.api!,\n\t\t\t\t\tstream: (model, context, options) => streamSimple(model, context, options as SimpleStreamOptions),\n\t\t\t\t\tstreamSimple,\n\t\t\t\t},\n\t\t\t\t`provider:${providerName}`,\n\t\t\t);\n\t\t}\n\n\t\tthis.storeProviderRequestConfig(providerName, config);\n\n\t\tif (config.models && config.models.length > 0) {\n\t\t\t// Full replacement: remove existing models for this provider\n\t\t\tthis.models = this.models.filter((m) => m.provider !== providerName);\n\n\t\t\t// Parse and add new models\n\t\t\tfor (const modelDef of config.models) {\n\t\t\t\tconst api = modelDef.api || config.api;\n\t\t\t\tthis.storeModelHeaders(providerName, modelDef.id, modelDef.headers);\n\n\t\t\t\tthis.models.push({\n\t\t\t\t\tid: modelDef.id,\n\t\t\t\t\tname: modelDef.name,\n\t\t\t\t\tapi: api as Api,\n\t\t\t\t\tprovider: providerName,\n\t\t\t\t\tbaseUrl: modelDef.baseUrl ?? config.baseUrl!,\n\t\t\t\t\treasoning: modelDef.reasoning,\n\t\t\t\t\tthinkingLevelMap: modelDef.thinkingLevelMap,\n\t\t\t\t\tinput: modelDef.input as (\"text\" | \"image\")[],\n\t\t\t\t\tcost: modelDef.cost,\n\t\t\t\t\tcontextWindow: modelDef.contextWindow,\n\t\t\t\t\tmaxTokens: modelDef.maxTokens,\n\t\t\t\t\theaders: undefined,\n\t\t\t\t\tcompat: modelDef.compat,\n\t\t\t\t} as Model<Api>);\n\t\t\t}\n\n\t\t\t// Apply OAuth modifyModels if credentials exist (e.g., to update baseUrl)\n\t\t\tif (config.oauth?.modifyModels) {\n\t\t\t\tconst cred = this.authStorage.get(providerName);\n\t\t\t\tif (cred?.type === \"oauth\") {\n\t\t\t\t\tthis.models = config.oauth.modifyModels(this.models, cred);\n\t\t\t\t}\n\t\t\t}\n\t\t} else if (config.baseUrl || config.headers) {\n\t\t\t// Override-only: update baseUrl for existing models. Request headers are resolved per request.\n\t\t\tthis.models = this.models.map((m) => {\n\t\t\t\tif (m.provider !== providerName) return m;\n\t\t\t\treturn {\n\t\t\t\t\t...m,\n\t\t\t\t\tbaseUrl: config.baseUrl ?? m.baseUrl,\n\t\t\t\t};\n\t\t\t});\n\t\t}\n\t}\n}\n\n/**\n * Input type for registerProvider API.\n */\nexport interface ProviderConfigInput {\n\tname?: string;\n\tbaseUrl?: string;\n\tapiKey?: string;\n\tapi?: Api;\n\tstreamSimple?: (model: Model<Api>, context: Context, options?: SimpleStreamOptions) => AssistantMessageEventStream;\n\theaders?: Record<string, string>;\n\tauthHeader?: boolean;\n\t/** OAuth provider for /login support */\n\toauth?: Omit<OAuthProviderInterface, \"id\">;\n\tmodels?: Array<{\n\t\tid: string;\n\t\tname: string;\n\t\tapi?: Api;\n\t\tbaseUrl?: string;\n\t\treasoning: boolean;\n\t\tthinkingLevelMap?: Model<Api>[\"thinkingLevelMap\"];\n\t\tinput: (\"text\" | \"image\")[];\n\t\tcost: { input: number; output: number; cacheRead: number; cacheWrite: number };\n\t\tcontextWindow: number;\n\t\tmaxTokens: number;\n\t\theaders?: Record<string, string>;\n\t\tcompat?: Model<Api>[\"compat\"];\n\t}>;\n}\n"]}