Firebase Firestore
Google's scalable, serverless NoSQL document database with real-time sync, offline support, and a REST API, designed for mobile and web app backends.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Firebase Security Rules for client-side access control. Admin SDK with service account for server-side (bypasses rules). SOC2, ISO27001. Real-time updates require security rules to prevent data leakage. Admin SDK access = full DB access — protect service account key carefully.
⚡ Reliability
Best When
You're building a mobile or web app where real-time sync is critical, you're already in the Google/Firebase ecosystem, and your data model fits documents with sub-collections.
Avoid When
Your data is highly relational, you need complex server-side queries, or you're cost-sensitive at scale.
Use Cases
- • Storing and retrieving structured agent state and conversation history with real-time sync
- • Multi-agent coordination through shared document state with listeners for change events
- • Mobile app backends where agents manage user data, preferences, or content
- • Real-time collaborative features — agents writing data that immediately appears in client apps
- • Serverless function triggers — Firestore document changes trigger Cloud Functions with agent logic
Not For
- • Complex relational queries with joins — use Cloud SQL or PostgreSQL instead
- • Bulk data processing and analytics at scale (use BigQuery)
- • Very high-throughput write workloads (single document write limit is 1/second)
- • Applications requiring strong ACID transactions across many documents
- • Cost-sensitive workloads at high read/write volume — Firestore costs can escalate quickly
Interface
Authentication
Firebase Auth tokens for client access with Firestore Security Rules. Service account JSON for admin/server-side access. Security Rules define per-document access control — complex but powerful. Admin SDK bypasses security rules entirely.
Pricing
Credit card required for Blaze plan upgrade, though free tier is accessible without one. Costs can grow unexpectedly — set budget alerts. Reads for list operations count per document returned.
Agent Metadata
Known Gotchas
- ⚠ 1 write/second sustained limit per document — agents doing frequent state updates to the same document will hit this
- ⚠ Security Rules are evaluated server-side and can silently block operations without clear error to client
- ⚠ List queries require composite indexes for multi-field ordering — missing index returns helpful error but requires console action
- ⚠ Realtime listeners (onSnapshot) don't work in server-side agent code — use one-time get() instead
- ⚠ Admin SDK bypasses security rules — agents using admin SDK can read/write anything in the project
- ⚠ Firestore costs per operation, not per byte — high read counts for list operations add up fast
- ⚠ Collection group queries require special index setup and have more limitations than single-collection queries
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-06.