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* Model capability validation utility.
*
* This service validates whether specific parameters are supported by AI models
* and handles parameter remapping for legacy models.
*/
import type {
ModelCapability,
ParameterRange,
ParameterValidationResult,
ProviderModelCapabilities,
} from '@shared/types/ai-providers/model-capabilities';
import { ModelParameter } from '@shared/types/ai-providers/model-capabilities';
import type { FunctionName } from '@shared/types/api/request';
import type { AIProvider } from '@shared/types/constants';
/**
* Registry of provider model capabilities.
*/
const providerCapabilitiesRegistry = new Map<
string,
ProviderModelCapabilities
>();
/**
* Register model capabilities for a provider.
*/
export function registerProviderCapabilities(
capabilities: ProviderModelCapabilities,
): void {
providerCapabilitiesRegistry.set(capabilities.provider, capabilities);
}
/**
* Parse model identifier to extract provider and model name.
* Supports formats like:
* - "gpt-4" (simple model name)
* - "openai/gpt-4" (OpenRouter format)
* - "anthropic/claude-3-opus" (OpenRouter format)
*/
export function parseModelIdentifier(
modelId: string,
defaultProvider?: AIProvider,
): { provider: string | undefined; modelName: string } {
// Check if model ID contains provider prefix (OpenRouter format)
const parts = modelId.split('/');
if (parts.length === 2) {
return {
provider: parts[0],
modelName: parts[1],
};
}
return {
provider: defaultProvider,
modelName: modelId,
};
}
/**
* Check if a model pattern matches a model name.
* Supports:
* - Exact match: "gpt-4"
* - Wildcard: "gpt-4*" matches "gpt-4-turbo", "gpt-4o", etc.
* - RegExp: custom regex patterns
*/
function matchesModelPattern(
modelName: string,
pattern: string | RegExp,
): boolean {
if (pattern instanceof RegExp) {
return pattern.test(modelName);
}
// Convert wildcard pattern to regex
if (pattern.includes('*')) {
const regexPattern = pattern.replace(/\*/g, '.*');
return new RegExp(`^${regexPattern}$`).test(modelName);
}
// Exact match
return modelName === pattern;
}
/**
* Find model capability configuration for a specific model.
*/
function findModelCapability(
providerCapabilities: ProviderModelCapabilities,
modelName: string,
): ModelCapability | undefined {
return providerCapabilities.models.find((modelCap) =>
matchesModelPattern(modelName, modelCap.modelPattern),
);
}
/**
* Validate if a parameter is supported by a model for a specific endpoint.
*/
export function validateParameter(
provider: AIProvider | string,
modelId: string,
parameter: ModelParameter,
functionName?: FunctionName,
): ParameterValidationResult {
// Parse model identifier (handles OpenRouter format)
const { provider: parsedProvider, modelName } = parseModelIdentifier(
modelId,
provider as AIProvider,
);
const effectiveProvider = parsedProvider || provider;
// Get provider capabilities
const providerCapabilities =
providerCapabilitiesRegistry.get(effectiveProvider);
if (!providerCapabilities) {
// No capabilities registered - assume supported
return {
isSupported: true,
parameterName: parameter,
};
}
// Find model-specific capability
const modelCapability = findModelCapability(providerCapabilities, modelName);
let isSupported = true;
let parameterName = parameter;
let reason: string | undefined;
let warning: string | undefined;
if (modelCapability) {
// Check if we have endpoint-specific configuration
if (!functionName) {
// No function name provided - assume all parameters supported
return {
isSupported: true,
parameterName: parameter,
};
}
const endpointConfig = modelCapability.endpointConfigs[functionName];
if (!endpointConfig) {
// No config for this endpoint - assume all parameters supported
return {
isSupported: true,
parameterName: parameter,
};
}
// Check endpoint-specific supported/unsupported parameters
const {
supportedParameters,
unsupportedParameters,
legacyParameterMapping,
} = endpointConfig;
// Check if parameter is explicitly supported
if (supportedParameters) {
isSupported = supportedParameters.includes(parameter);
if (!isSupported) {
reason = `Parameter '${parameter}' is not in the supported parameters list for endpoint '${functionName}' on model '${modelName}'`;
}
}
// Check if parameter is explicitly unsupported
else if (unsupportedParameters) {
isSupported = !unsupportedParameters.includes(parameter);
if (!isSupported) {
reason = `Parameter '${parameter}' is not supported by endpoint '${functionName}' on model '${modelName}'`;
}
}
// Check for parameter remapping (legacy models)
if (isSupported && legacyParameterMapping) {
const mappedParameter = legacyParameterMapping[parameter as string];
if (mappedParameter !== undefined) {
parameterName = mappedParameter;
}
}
} else {
// No model-specific config, check provider defaults
if (providerCapabilities.defaultSupportedParameters) {
isSupported =
providerCapabilities.defaultSupportedParameters.includes(parameter);
if (!isSupported) {
reason = `Parameter '${parameter}' is not in the default supported parameters for provider '${effectiveProvider}'`;
}
} else if (providerCapabilities.defaultUnsupportedParameters) {
isSupported =
!providerCapabilities.defaultUnsupportedParameters.includes(parameter);
if (!isSupported) {
reason = `Parameter '${parameter}' is not supported by provider '${effectiveProvider}'`;
}
}
}
return {
isSupported,
parameterName: isSupported ? parameterName : undefined,
reason,
warning,
};
}
/**
* Get the parameter range for a specific parameter on a model/endpoint.
*/
function getParameterRange(
providerCapabilities: ProviderModelCapabilities,
modelCapability: ModelCapability | undefined,
parameter: ModelParameter,
functionName?: FunctionName,
): ParameterRange | undefined {
// Check endpoint-specific ranges first
if (modelCapability && functionName) {
const endpointConfig = modelCapability.endpointConfigs[functionName];
if (endpointConfig?.parameterRanges) {
const range = endpointConfig.parameterRanges[parameter];
if (range) return range;
}
}
// Fall back to provider default ranges
if (providerCapabilities.defaultParameterRanges) {
return providerCapabilities.defaultParameterRanges[parameter];
}
return undefined;
}
/**
* Transform a normalized value (0-1) to the model's expected range.
*/
export function transformParameterValue(
normalizedValue: number,
range: ParameterRange,
): number {
const { min, max } = range;
return min + normalizedValue * (max - min);
}
/**
* Validate and optionally transform a parameter value based on model capabilities.
*/
export function validateAndTransformParameter(
provider: AIProvider | string,
modelId: string,
parameter: ModelParameter,
value: number,
functionName?: FunctionName,
shouldTransform = true,
): ParameterValidationResult {
// First validate if parameter is supported
const validation = validateParameter(
provider,
modelId,
parameter,
functionName,
);
if (!validation.isSupported) {
return validation;
}
// Parse model identifier
const { provider: parsedProvider, modelName } = parseModelIdentifier(
modelId,
provider as AIProvider,
);
const effectiveProvider = parsedProvider || provider;
// Get provider capabilities
const providerCapabilities =
providerCapabilitiesRegistry.get(effectiveProvider);
if (!providerCapabilities) {
return validation;
}
// Find model-specific capability
const modelCapability = findModelCapability(providerCapabilities, modelName);
// Get parameter range
const parameterRange = getParameterRange(
providerCapabilities,
modelCapability,
parameter,
functionName,
);
// If no range defined or transformation disabled, return as-is
if (!parameterRange || !shouldTransform) {
return {
...validation,
parameterRange,
};
}
// Transform the value
const transformedValue = transformParameterValue(value, parameterRange);
return {
...validation,
transformedValue,
parameterRange,
};
}
/**
* Get all supported parameters for a model and optional endpoint.
*/
export function getSupportedParameters(
provider: AIProvider | string,
modelId: string,
functionName?: FunctionName,
): ModelParameter[] {
const { provider: parsedProvider, modelName } = parseModelIdentifier(
modelId,
provider as AIProvider,
);
const effectiveProvider = parsedProvider || provider;
const providerCapabilities =
providerCapabilitiesRegistry.get(effectiveProvider);
if (!providerCapabilities) {
// Return all parameters if no capabilities registered
return Object.values(ModelParameter);
}
const modelCapability = findModelCapability(providerCapabilities, modelName);
if (modelCapability) {
// Check if we have function name and endpoint config
if (!functionName) {
// No function name - return all parameters
return Object.values(ModelParameter);
}
const endpointConfig = modelCapability.endpointConfigs[functionName];
if (!endpointConfig) {
// No config for this endpoint - return all parameters
return Object.values(ModelParameter);
}
// Use endpoint-specific supported parameters
if (endpointConfig.supportedParameters) {
return endpointConfig.supportedParameters;
}
// Use endpoint-specific unsupported parameters
if (endpointConfig.unsupportedParameters) {
return Object.values(ModelParameter).filter(
(param) => !endpointConfig.unsupportedParameters!.includes(param),
);
}
// No restrictions for this endpoint
return Object.values(ModelParameter);
}
// Use provider defaults
if (providerCapabilities.defaultSupportedParameters) {
return providerCapabilities.defaultSupportedParameters;
}
if (providerCapabilities.defaultUnsupportedParameters) {
return Object.values(ModelParameter).filter(
(param) =>
!providerCapabilities.defaultUnsupportedParameters!.includes(param),
);
}
return Object.values(ModelParameter);
}
/**
* Validate multiple parameters at once.
*/
export function validateParameters(
provider: AIProvider | string,
modelId: string,
parameters: ModelParameter[],
functionName?: FunctionName,
): Map<ModelParameter, ParameterValidationResult> {
const results = new Map<ModelParameter, ParameterValidationResult>();
for (const parameter of parameters) {
results.set(
parameter,
validateParameter(provider, modelId, parameter, functionName),
);
}
return results;
}
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