MCP Tools Reference: storage.googleapis.com

Tool: get_bucket_metadata

Gets the metadata of a bucket.

The following code sample shows how to use curl to call the get_bucket_metadata MCP tool.

Curl Request 
curl --location 'https://storage.googleapis.com/storage/mcp' \
--header 'content-type: application/json' \
--header 'accept: application/json, text/event-stream' \
--data '{
  "method": "tools/call",
  "params": {
    "name": "get_bucket_metadata",
    "arguments": {
      // Provide these details according to the MCP tool specification.
    }
  },
  "jsonrpc": "2.0",
  "id": 1
}'

Input Schema

Request message for GetBucketMetadata.

GetBucketMetadataRequest

JSON representation 
{
  "bucketName": string
}
Fields
bucketName

string

Required. The name of the bucket to get metadata for.

Output Schema

A bucket within Cloud Storage.

Bucket

JSON representation 
{
  "bucketName": string,
  "project": string,
  "location": string,
  "locationType": string,
  "storageClass": string,
  "timeCreated": string,
  "timeLastModified": string,
  "etag": string,
  "metageneration": string,
  "rpo": string,
  "autoclass": {
    object (AutoclassMetadata)
  },
  "encryption": {
    object (BucketEncryptionMetadata)
  },
  "ubla": {
    object (UniformBucketLevelAccessMetadata)
  },
  "publicAccessPrevention": string,
  "versioningEnabled": boolean,
  "defaultEventBasedHold": boolean,
  "retentionPolicy": {
    object (RetentionPolicyMetadata)
  },
  "softDeletePolicy": {
    object (SoftDeletePolicyMetadata)
  },
  "labels": {
    string: string,
    ...
  },
  "hierarchicalNamespaceEnabled": boolean,
  "objectRetentionEnabled": boolean
}
Fields
bucketName

string

Cloud Storage bucket name.
project

string

Project ID or number containing the bucket.
location

string

Location of the bucket.
locationType

string

Location type of the bucket (for example, "region", "dual-region", or "multi-region").
storageClass

string

Storage class of the bucket.
timeCreated

string (Timestamp format)

Creation time of the bucket.

Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".
timeLastModified

string (Timestamp format)

Last modification time of the bucket.

Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".
etag

string

ETag of the bucket.
metageneration

string (int64 format)

Metageneration of the bucket.
rpo

string

Recovery point objective (RPO) of the bucket.
autoclass

object (AutoclassMetadata)

Autoclass configuration for the bucket.
encryption

object (BucketEncryptionMetadata)

Default encryption configuration for the bucket.
ubla

object (UniformBucketLevelAccessMetadata)

Uniform bucket-level access configuration for the bucket.
publicAccessPrevention

string

Public access prevention setting for the bucket.
versioningEnabled

boolean

Whether object versioning is enabled for the bucket.
defaultEventBasedHold

boolean

Whether default event-based hold is enabled for the bucket.
retentionPolicy

object (RetentionPolicyMetadata)

Retention policy configuration for the bucket.
softDeletePolicy

object (SoftDeletePolicyMetadata)

Soft delete policy configuration for the bucket.
labels

map (key: string, value: string)

User-provided labels for the bucket.

An object containing a list of "key": value pairs. Example: { "name": "wrench", "mass": "1.3kg", "count": "3" }.
hierarchicalNamespaceEnabled

boolean

Whether hierarchical namespace is enabled for the bucket.
objectRetentionEnabled

boolean

Whether object retention is enabled for the bucket.

Timestamp

JSON representation 
{
  "seconds": string,
  "nanos": integer
}
Fields
seconds

string (int64 format)

Represents seconds of UTC time since Unix epoch 1970-01-01T00:00:00Z. Must be between -62135596800 and 253402300799 inclusive (which corresponds to 0001-01-01T00:00:00Z to 9999-12-31T23:59:59Z).
nanos

integer

Non-negative fractions of a second at nanosecond resolution. This field is the nanosecond portion of the duration, not an alternative to seconds. Negative second values with fractions must still have non-negative nanos values that count forward in time. Must be between 0 and 999,999,999 inclusive.

AutoclassMetadata

JSON representation 
{
  "enabled": boolean,
  "toggleTime": string
}
Fields
enabled

boolean

Whether autoclass is enabled.
toggleTime

string (Timestamp format)

Time when autoclass state was toggled.

Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".

BucketEncryptionMetadata

JSON representation 
{
  "defaultKmsKeyName": string
}
Fields
defaultKmsKeyName

string

Default KMS key name used for encryption.

UniformBucketLevelAccessMetadata

JSON representation 
{
  "enabled": boolean,
  "lockTime": string
}
Fields
enabled

boolean

Whether uniform bucket-level access is enabled.
lockTime

string (Timestamp format)

Time when uniform bucket-level access was locked.

Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".

RetentionPolicyMetadata

JSON representation 
{
  "effectiveTime": string,
  "isLocked": boolean,
  "retentionPeriodSeconds": string
}
Fields
effectiveTime

string (Timestamp format)

Effective time of the retention policy.

Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".
isLocked

boolean

Whether the retention policy is locked.
retentionPeriodSeconds

string (int64 format)

Retention period in seconds.

SoftDeletePolicyMetadata

JSON representation 
{
  "retentionDurationSeconds": string,
  "effectiveTime": string
}
Fields
retentionDurationSeconds

string (int64 format)

Retention duration in seconds for soft-deleted objects.
effectiveTime

string (Timestamp format)

Effective time of the soft delete policy.

Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".

LabelsEntry

JSON representation 
{
  "key": string,
  "value": string
}
Fields
key

string
value

string

Tool Annotations

Tool annotations are sent to MCP clients to describe the basic risk of a given tool. Most clients treat these hints as untrusted, but they can be used to decide when a confirmation prompt might be sent to a user.

Along with the title string, the following boolean hints are defined as follows:

  • readOnlyHint: If true, the tool doesn't modify its environment. Default: false.
  • destructiveHint: If true, then the tool can perform destructive actions. If false, then the tool can only perform additive actions. Default: true.
  • idempotentHint: If true, then calling the tool repeatedly with the same arguments will have no additional effect on its environment. Default: false.
  • openWorldHint: If true, then the tool can interact with an 'open world' of external entities. If false, then the tool can only interact with internal entities. For example, a web search tool would be open world, while a memory tool would not be open world.

Destructive Hint: ❌ | Idempotent Hint: ✅ | Read Only Hint: ✅ | Open World Hint: ❌