Gemini rate limit error (429 code)

"Why does it show a 'current quota exceeded' issue? Is there any model available in Google AI Studio that is free to use, as mentioned in the README file? The README outlines the steps but doesn't mention that a subscription is required. Could you please clarify this?"

Am facing below error while asking google kubectl ai agent perform action on cluster

Error: reading streaming LLM response: Error 429, Message: You exceeded your current quota, please check your plan and billing details. For more information on this error, head to: https://ai.google.dev/gemini-api/docs/rate-limits., Status: RESOURCE_EXHAUSTED, Details: [map[@type:type.googleapis.com/google.rpc.QuotaFailure violations:[map[quotaDimensions:map[location:global model:gemini-2.0-pro-exp] quotaId:GenerateContentInputTokensPerModelPerMinute-FreeTier quotaMetric:generativelanguage.googleapis.com/generate_content_free_tier_input_token_count] map[quotaId:GenerateRequestsPerDayPerProjectPerModel quotaMetric:generativelanguage.googleapis.com/generate_requests_per_model_per_day] map[quotaDimensions:map[location:global model:gemini-2.0-pro-exp] quotaId:GenerateRequestsPerMinutePerProjectPerModel-FreeTier quotaMetric:generativelanguage.googleapis.com/generate_content_free_tier_requests] map[quotaDimensions:map[location:global model:gemini-2.0-pro-exp] quotaId:GenerateRequestsPerDayPerProjectPerModel-FreeTier quotaMetric:generativelanguage.googleapis.com/generate_content_free_tier_requests] map[quotaDimensions:map[location:global model:gemini-2.0-pro-exp] quotaId:GenerateContentInputTokensPerModelPerDay-FreeTier quotaMetric:generativelanguage.googleapis.com/generate_content_free_tier_input_token_count]]] map[@type:type.googleapis.com/google.rpc.Help links:[map[description:Learn more about Gemini API quotas url:https://ai.google.dev/gemini-api/docs/rate-limits]]] map[@type:type.googleapis.com/google.rpc.RetryInfo retryDelay:56s]]