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Request
ConfigFlag
ResourceMeta
ConfigFlagSpec
TargetingRule
Response
ProblemDetails
OperationProgress
Condition
Errors
Examples

Reference

Update a config flag

Updates a config flag; the change rolls out in waves and the Operation is done when every cell serves it.

Checked 2026-09-28

Updates a config flag; the change rolls out in waves and the Operation is done when every cell serves it.

Path PATCH https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/config_flags/config-flag
Scope config:write
Effect write — a successful call changes state.
Collection config_flags
Query update_mask, validate_only
Operation answers with an Operation; the result is ConfigFlag

#Request

Field	Type	What it is
`config_flag`	`ConfigFlag`	The config flag to update; `name` identifies it. Required.
`update_mask`	`field_mask`	The fields to write; unset writes every populated field.
`validate_only`	`bool`	Validate and return the result without writing anything.

#ConfigFlag

Field	Type	What it is
`name`	`string`	`orgs/{org}/projects/{project}/envs/{env}/config_flags/{config_flag}`; the id is the key evaluators ask for.
`meta`	`ResourceMeta`	Resource metadata.
`spec`	`ConfigFlagSpec`	Desired state. Required.

#ResourceMeta

Field	Type	What it is
`labels`	`map<string, string>`	Caller-writable, indexed labels (AIP-122 label rules).
`annotations`	`map<string, string>`	Caller-writable, unindexed annotations.
`display_name`	`string`	Caller-writable human-readable name.

#ConfigFlagSpec

Field	Type	What it is
`value_type`	`ConfigValueType`	The type every value of the flag has. Required. One of `bool`, `string`, `int64`, `double`, `json`.
`default_value`	`value`	The value when no rule matches, or when the flag is disabled. Required.
`enabled`	`bool`	When false, every evaluation returns `default_value` and the rules are skipped: a kill switch. Default true.
`rules`	`TargetingRule[]`	Targeting rules, first match wins.
`description`	`string`	What the flag is for.
`client_visible`	`bool`	Publishable keys (browsers, mobile apps) may evaluate it with `config_flags:evaluate`; default false, so a server-only flag's value never reaches a device. Secret keys evaluate every flag.

#TargetingRule

Field	Type	What it is
`value`	`value`	The value served when the rule matches; of the flag's type. Required.
`percentage`	`int32`	Serve `value` to evaluations whose bucket is below this, from 0 to 100; default 100. The rest fall through to the next rule.
`bucket_attribute`	`string`	The context attribute hashed for the bucket: `user_id`, `anonymous_id`, or an attribute path; default `user_id`, else `anonymous_id`. An evaluation without it never matches a rule below 100 percent.
`description`	`string`	What the rule is for.
`conditions`	`TargetingCondition[]`	Conditions over the evaluation context; all must hold. None matches every evaluation.

#Response

Field	Type	What it is
`name`	`string`	`{parent-of-target}/operations/{operation}`.
`target`	`string`	The name of the Resource being changed.
`target_generation`	`int64`	The generation this Operation waits for.
`verb`	`OperationVerb`	What the Operation does. One of `create`, `update`, `delete`, `custom`.
`custom_verb`	`string`	The custom method verb when `verb` is CUSTOM, for example `revoke`.
`done`	`bool`	Whether the Operation has finished.
`create_time`	`timestamp`	When the Operation started.
`end_time`	`timestamp`	When the Operation finished.
`response`	`any`	The settled Resource (or Empty for a delete). One of the `result` group.
`error`	`ProblemDetails`	The failure, as the one error body. One of the `result` group.
`progress`	`OperationProgress`	Progress while not `done`.

#ProblemDetails

Field	Type	What it is
`type`	`string`	`https://sylphx.com/docs/errors/<code in kebab-case>`.
`title`	`string`	A short customer-safe summary of the problem class.
`status`	`int32`	The HTTP status, fixed by `grpc_status`.
`detail`	`string`	A customer-safe explanation of this occurrence. Never contains SQL, stack traces, internal hostnames, or another tenant's data.
`instance`	`string`	The request id (`Sylphx-Request-Id`).
`code`	`string`	The stable UPPER_SNAKE code, one of ErrorCode without its prefix.
`grpc_status`	`string`	One of the 16 canonical gRPC status names, for example `ABORTED`.
`retryable`	`bool`	Whether the same request may be retried.
`effect`	`ErrorEffect`	What the failed call committed. One of `none`, `applied`, `unknown`.
`retry_after_ms`	`int64`	How long to wait before retrying, when the server knows.
`details`	`any[]`	Typed details such as PreconditionFailure or EntitlementDenial.

#OperationProgress

Field	Type	What it is
`percent`	`int32`	Percent complete, when the controller can tell.
`message`	`string`	A customer-safe progress message.
`conditions`	`Condition[]`	The target's conditions when this progress was read.

#Condition

Field	Type	What it is
`type`	`string`	The condition type, for example `Ready`.
`status`	`ConditionStatus`	Whether the condition holds. One of `true`, `false`, `unknown`.
`observed_generation`	`int64`	The generation this observation was made against.
`reason`	`string`	A machine-readable UpperCamelCase reason.
`message`	`string`	A customer-safe human-readable message.
`severity`	`Severity`	How severe a FALSE condition is. One of `info`, `warning`, `error`.
`transition_time`	`timestamp`	When `status` last changed.

#Errors

UNAUTHENTICATED — No valid key or token was presented.
PERMISSION_DENIED — The key lacks the method's permission.
RESOURCE_NOT_FOUND — The named Resource does not exist or is not visible.
UNKNOWN_FIELD — The request has a field the schema does not know.
INVALID_FIELD — A field failed validation.
ETAG_MISMATCH — The etag sent does not match the Resource's current etag.
IDEMPOTENCY_KEY_REUSED — An Idempotency-Key was reused with another body.
IDEMPOTENCY_IN_PROGRESS — The first call with this Idempotency-Key is still running.

Every error arrives in the body Errors describes.

#Examples

curl -X PATCH "https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/config_flags/config-flag" \
  -H "Authorization: Bearer $SYLPHX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"name":"orgs/acme/projects/shop/envs/production/config_flags/config-flag","spec":{"default_value":{},"value_type":"bool"}}'

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