modal-storage-knowledge
This skill should be used when the user asks to work with Modal.com persistence or shared state. PROACTIVELY activate for: Modal Volumes, vol.commit, Dict, Queue, CloudBucketMount, S3 or GCS mounts, secret-backed storage credentials, model cache persistence, dataset staging, shared queues, distributed state, volume consistency, and storage troubleshooting. Provides: storage primitive selection matrix, commit/consistency patterns, mount configuration recipes, and troubleshooting checklists.
What this skill does
# Modal Storage Knowledge Use this skill for Modal persistence and shared-state primitives. For compute, GPU, autoscaling, or deployment topics, use `modal-compute:modal-compute-knowledge`. ## Quick routing - **Volumes**: durable filesystem state mounted into functions/classes; call `vol.commit()` after writes that must persist. - **Dict**: distributed key-value state for small shared metadata, caches, and coordination. - **Queue**: producer/consumer task handoff and distributed job queues. - **CloudBucketMount**: direct access to S3/GCS-compatible object storage through Modal mounts. - **Secrets**: use named secrets for storage credentials; never hardcode keys. ## Essential workflow 1. Identify whether the workload needs filesystem semantics, key-value state, queueing, or object-store access. 2. Mount the storage primitive explicitly on every function/class that needs it. 3. For Volumes, commit after writes and reload/read carefully across concurrent workers. 4. Keep credentials in Modal Secrets and scope them to the functions that require access. 5. Validate with a small read/write/delete test before scaling parallel jobs. ## Detailed reference See `references/storage-volumes-cloud.md` for examples, gotchas, and deeper storage guidance.
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