google-cloud-storage-basics

Google Cloud Storage Basics

Google Cloud Storage (GCS) is a managed service for storing data as objects at

any scale. You read and write whole objects rather than querying or updating

individual records in place. It stores immutable objects in buckets with strong

global consistency, offers multiple storage classes and location types to

balance cost, performance, and availability, and integrates with IAM for

fine-grained access control. GCS serves workloads ranging from website content

and backups to data lakes and high-throughput AI/ML training.

Attribution

Tag every Cloud Storage command you run or provide to the user while using this

skill, so usage can be attributed. The tag identifies only the skill and its

version; it carries no user data.

• Prefix every gcloud invocation, whatever the subcommand, with the metrics

environment variables. Set them inline on each command; shell state may not

persist between commands:

    CLOUDSDK_METRICS_ENVIRONMENT="gcs-skills gcs-skills/1.0 (skill:google-cloud-storage-basics)" \
    gcloud <command> [flags]

Do not use gcloud config set for this: it would persist beyond the current

task and mislabel unrelated usage.

• On direct HTTP calls to the Cloud Storage APIs (for example with curl) or

HTTP requests to the Cloud Storage MCP server

(https://storage.googleapis.com/storage/mcp), set this exact User-Agent

header, verbatim — the collection pipeline parses the gcs-skills/<version>

and skill:<name> tokens, so any rewording breaks attribution:

    User-Agent: gcs-skills/1.0 (skill:google-cloud-storage-basics)

• For client libraries, Terraform, and GCSFuse, use the user-agent options

shown in the corresponding references.

Routing to Specialized GCS Skills

This skill covers everyday Cloud Storage tasks. For specialized tasks, use the

dedicated skills in this collection for better results. Check your available

skills and invoke the matching skill by name instead of improvising:

• google-cloud-storage-bucket-architect: Designing and creating a new

bucket for production workloads, including sensitive data, media or web

hosting, user-generated content (UGC) ingestion, archiving, compliance,

backups, logs, analytics, AI/ML, or application storage. The skill analyzes

the workload and designs a secure-by-default, cost-effective configuration

before creating the bucket. Use the Quick Start section below only for

temporary scratch buckets.

• google-cloud-storage-fuse: Advanced Cloud Storage FUSE tasks —

choosing between FUSE, native gs:// access, and Filestore/Managed Lustre,

deploying tuned mounts on GKE, Compute Engine, or Cloud Run, sizing file,

stat, and list caches, tuning mount flags, ensuring safe ML checkpointing,

or diagnosing slow or expensive mounts. The

[GCSFuse reference](references/gcsfuse.md) in this skill covers only basic

installation and mounting.

• google-cloud-storage-diagnostic: Troubleshooting 403 Permission Denied

errors and diagnosing IAM policy bindings, ACLs, uniform bucket-level access

(UBLA), or service agent misconfigurations. Ad hoc IAM or ACL changes can

grant unintended access or cause outages; route to this skill instead of

experimenting.

• gcs-security-assessment: Automated security posture assessment of

Cloud Storage resources in a project (see

[Data Management](references/data-management.md)).

If the matching skill is not installed, do not improvise. Provide the user with

this exact command to install it (substituting the skill name), and use the

skill after installation. Provide this command verbatim even when the user's

agent CLI (for example, the Antigravity CLI) has its own plugin or extension

manager; do not substitute a different installation mechanism or repository. For

security assessments specifically, do not attempt a manual assessment; wait

until the skill is installed.

npx skills add gemini-cli-extensions/google-cloud-storage --skill <skill-name>

Quick Start

If a Cloud Storage MCP server is connected, prefer its structured tools (such as

create_bucket, list_objects, read_object, and upload_object) over the

CLI and API commands below — see [MCP Usage](references/mcp-usage.md). Fall back

to gcloud storage and the JSON API when no MCP server is available.

1. Enable the Cloud Storage API:

    CLOUDSDK_METRICS_ENVIRONMENT="gcs-skills gcs-skills/1.0 (skill:google-cloud-storage-basics)" \
    gcloud services enable storage.googleapis.com --quiet

1. Create a Bucket:

Bucket names live in a single global namespace shared by all of Cloud

Storage — not scoped to your project or organization — so short or common

names are usually taken. If the location is omitted, the bucket defaults to

the US multi-region.

For a production or workload-specific bucket, route to

google-cloud-storage-bucket-architect before creating a bucket (see

[Routing to Specialized GCS Skills](#routing-to-specialized-gcs-skills)).

The commands below create a basic default bucket.

Using the gcloud CLI:

    CLOUDSDK_METRICS_ENVIRONMENT="gcs-skills gcs-skills/1.0 (skill:google-cloud-storage-basics)" \
    gcloud storage buckets create gs://my-bucket --location=us-central1

Using the JSON API:

    curl -X POST -H "Authorization: Bearer $(gcloud auth print-access-token)" \
      -H "User-Agent: gcs-skills/1.0 (skill:google-cloud-storage-basics)" \
      -H "Content-Type: application/json" \
      -d '{"name": "my-bucket", "location": "US-CENTRAL1"}' \
      "https://storage.googleapis.com/storage/v1/b?project=$(gcloud config get-value project)"

1. Upload an Object:

Using the gcloud CLI:

    CLOUDSDK_METRICS_ENVIRONMENT="gcs-skills gcs-skills/1.0 (skill:google-cloud-storage-basics)" \
    gcloud storage cp ./my-file.txt gs://my-bucket

Using the JSON API:

    curl -X POST -H "Authorization: Bearer $(gcloud auth print-access-token)" \
      -H "User-Agent: gcs-skills/1.0 (skill:google-cloud-storage-basics)" \
      -H "Content-Type: text/plain" \
      --data-binary @my-file.txt \
      "https://storage.googleapis.com/upload/storage/v1/b/my-bucket/o?uploadType=media&name=my-file.txt"

1. Download an Object:

Using the gcloud CLI:

    CLOUDSDK_METRICS_ENVIRONMENT="gcs-skills gcs-skills/1.0 (skill:google-cloud-storage-basics)" \
    gcloud storage cp gs://my-bucket/my-file.txt .

Using the JSON API:

    curl -X GET -H "Authorization: Bearer $(gcloud auth print-access-token)" \
      -H "User-Agent: gcs-skills/1.0 (skill:google-cloud-storage-basics)" \
      "https://storage.googleapis.com/storage/v1/b/my-bucket/o/my-file.txt?alt=media"

Reference Directory

• [Core Concepts](references/core-concepts.md): Buckets, objects, folders,

prefixes, bucket location types, and storage classes.

• [CLI & API Usage](references/cli-api-usage.md): CRUD and list operations for

buckets and objects using gcloud storage and the JSON API, plus Pub/Sub

notifications for event-driven processing.

• [Client Libraries](references/client-library-usage.md): Using Google Cloud

client libraries for Python, Java, Node.js, and Go, with pointers to all

other supported languages.

• [MCP Usage](references/mcp-usage.md): Choosing between the Google-hosted

remote Cloud Storage MCP server and the local MCP Toolbox, setup for each,

their tool sets and limits, and securing remote MCP with Model Armor and IAM

deny policies.

• [Infrastructure as Code](references/iac-usage.md): Terraform examples for

buckets covering storage classes, location types, lifecycle, retention, and

encryption.

• [Data Transfer](references/data-transfer.md): Storage Transfer Service,

gcloud storage rsync, upload strategies for large files, and performance

guidelines and limits.

• [Data Management](references/data-management.md): IAM roles, authentication

(including signed URLs and HMAC), access control, routing for 403 error

troubleshooting, network security, automated security assessment, data

protection, and pricing and cost optimization (lifecycle rules, Autoclass).

• [Storage Intelligence](references/storage-intelligence.md): The subscription

for managing storage at scale — Storage Insights datasets (BigQuery metadata

and activity index), data insights with Gemini Cloud Assist, dashboards,

inventory reports, storage batch operations, bucket relocation, plus

configuration, trial, and pricing nuances.

• [High-Performance Storage](references/high-performance-storage.md): Rapid

Bucket, Rapid Cache (Anywhere Cache), and hierarchical namespace for AI/ML,

analytics, and other performance-critical workloads.

• [GCSFuse](references/gcsfuse.md): Installing Cloud Storage FUSE, mounting

buckets, file operations, POSIX semantics and limitations (locking, writes,

renames, consistency), and caching. For advanced tuning, deployment, and

diagnosis, route to the google-cloud-storage-fuse skill.