Gemini API Logs: Choose What You Retain Before the First Incident

Gemini’s two main API surfaces start with opposite storage defaults. This guide turns that mismatch into a small operating model: state first, retention second, sharing last.

By Marcus · Updated August 18, 2026 · 7 min read

Picture the first serious agent failure after launch. An engineer needs the tool-call trace. Security needs to know whether the prompt contained customer data. Product needs the conversation to continue. Those three needs sound compatible until the team discovers that the call path itself has already chosen a storage default.

Google’s current documentation says the Interactions API starts with store=true, while GenerateContent starts with store=false. Moving a feature between those surfaces can therefore change retention without anyone touching the Logs page. The practical fix is a one-page decision record for every call path.

Start with the feature, not the retention menu

Interactions can keep state and continue work through previous_interaction_id. Google also notes that store=false removes features that depend on stored state, including background execution and later continuation. A blanket “never store” rule can therefore break the user promise just as easily as an unexamined “store everything” default can over-collect.

Classify each path before choosing a number of days:

• Reconstructable request: a classifier, extraction job, or one-shot transformation whose input can be safely replayed from an approved fixture.
• Stateful product interaction: a conversation or agent run that genuinely needs server-side continuity.
• Incident sample: a deliberately selected and redacted trace retained to explain one failure.

Four moments, four owners

Do not merge debugging with model-improvement consent

Google describes ordinary developer logs as project-private API data. Dataset contribution is a separate opt-in action and the documentation warns against sharing personal, sensitive, or confidential information. Feedback controls can also transmit the selected interaction. In an internal runbook, those actions deserve an outbound-data label and a separate permission.

For a zero developer-retention path, Google requires store=false for Interactions. Its zero-data-retention guidance also distinguishes developer storage from other service-specific processing and abuse monitoring. The accurate promise is therefore narrow: “this request is not stored as a developer Interaction,” not an absolute claim that no service record can exist anywhere.

Three operating modes that are easy to audit

1. Stateless by design

Set store=false explicitly. Keep payload-free operational metrics and a synthetic reproduction fixture. Use this when the product does not promise server-side continuation.

2. Stateful for a bounded purpose

Keep storage only for the feature that needs it. Select a short retention window, document what happens when the record expires, and make the recovery path visible to the user.

3. Incident sample by promotion

Reproduce with synthetic or redacted data where possible. Promote only the minimum useful trace into an internal dataset. Give that dataset an owner and deletion date; keep contribution disabled unless a separate review approves it.

The release note your team should be able to answer

1. Which endpoint handles each Gemini feature?
2. What is the effective store value after project and request settings are combined?
3. Which capability fails when storage is disabled?
4. How long can an authorized engineer inspect the payload?
5. Who may create a dataset, submit feedback, or contribute data?
6. What does the product do after stored state expires?

Official sources

• Gemini API — Logs and datasets, checked August 18, 2026.
• Gemini API — Data Logging and Sharing, checked August 18, 2026.
• Gemini API — Interactions API, checked August 18, 2026.
• Gemini API — Zero data retention, checked August 18, 2026.
• Gemini API — Release notes, checked August 18, 2026.