Google's Gemini Spark AI agent completed complex multi-step tasks in testing, but reviewer questions whether $99.99/month cost justifies the capability gaps and privacy concerns.

Google gave a reviewer access to Gemini Spark, its AI agent that operates in the background on multi-step tasks. In one test, Spark drafted an email to the reviewer's wife that compiled total monthly average grocery spending from a 2026 budget spreadsheet, found her email address, and included a personalized sign-off — all without being given her name.

Spark sometimes fails or requires workarounds. When asked to help plan a block party, it created a non-existent shared sign-up sheet in a draft email and generated an incomplete deck; it later succeeded at creating the missing spreadsheet and inserting the link into the email, but took several minutes. A document it created for preschool prep was accessible only to the reviewer, not shared with his wife as requested.

Spark is available only to subscribers of Google's AI Ultra plan at $99.99 per month, only to users in the US, and only in English. The reviewer found the output required constant checking to verify accuracy, particularly when it pulled from personal information, and questioned whether the time saved justified the cost and the need to trust Google with personal data access.