> **Experimental**
>
> `@aws-cdk/aws-bedrock-alpha` is an [**experimental**](/stability) (alpha) package: its API may change in any release, without a major version bump.
# IKnowledgeBase

Represents an Amazon Bedrock knowledge base of any type, either created with the CDK or imported.

Extends: IKnowledgeBase
Extends: IResource, IKnowledgeBaseRef, IGrantable
Implemented by: KnowledgeBase, KnowledgeBaseBase

- Stability: [Experimental](/cdk/api/stability.html)
- Source: [`bedrock/knowledge-bases/knowledge-base.ts`](https://github.com/aws/aws-cdk/blob/v2.274.0-alpha.0/packages/@aws-cdk/aws-bedrock-alpha/bedrock/knowledge-bases/knowledge-base.ts#L25)
- Type last changed: v2.274.0-alpha.0 · 21 Oct 2026

## Properties

- `env`: [ResourceEnvironment](/cdk/api/v2/docs/aws-cdk-lib.interfaces.ResourceEnvironment.html) (required) — The environment this resource belongs to.

  For resources that are created and managed in a Stack (those created by
  creating new class instances like `new Role()`, `new Bucket()`, etc.), this
  is always the same as the environment of the stack they belong to.

  For referenced resources (those obtained from referencing methods like
  `Role.fromRoleArn()`, `Bucket.fromBucketName()`, etc.), they might be
  different than the stack they were imported into.

- `grantPrincipal`: [IPrincipal](/cdk/api/v2/docs/aws-cdk-lib.aws_iam.IPrincipal.html) (required) — The principal to grant permissions to.

- `grants`: [KnowledgeBaseGrants](/cdk/api/v2/docs/@aws-cdk_aws-bedrock-alpha.KnowledgeBaseGrants.html) (required) — Grant permissions on this knowledge base to IAM principals.

- `knowledgeBaseArn`: string (required) — The ARN of the knowledge base.

- `knowledgeBaseId`: string (required) — The unique identifier of the knowledge base.

- `knowledgeBaseRef`: [KnowledgeBaseReference](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_bedrock.KnowledgeBaseReference.html) (required) — A reference to a KnowledgeBase resource.

- `node`: [Node](/cdk/api/v2/docs/constructs.Node.html) (required) — The tree node.

- `reflections`: [KnowledgeBaseReflection](/cdk/api/v2/docs/@aws-cdk_aws-bedrock-alpha.KnowledgeBaseReflection.html) (required) — Resolves the underlying `CfnKnowledgeBase` from the construct tree.

- `role`: [IRoleRef](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_iam.IRoleRef.html) — The service role that Amazon Bedrock assumes to operate the knowledge base.

  To add permissions to the role, use `addToRolePolicy()` or grant to the
  knowledge base itself, which is an `IGrantable`.

  Undefined for imported knowledge bases whose role was not provided.

- `stack`: [Stack](/cdk/api/v2/docs/aws-cdk-lib.Stack.html) (required) — The stack in which this resource is defined.

## Methods

- `addToRolePolicy(statement: PolicyStatement): void` — Adds a statement to the IAM policy of the knowledge base service role.

  For a referenced knowledge base whose role was not provided, the statement
  cannot be applied; a warning is emitted with the statement to add to the
  role manually.

- `applyRemovalPolicy(policy: RemovalPolicy): void` — Apply the given removal policy to this resource.

  The Removal Policy controls what happens to this resource when it stops
  being managed by CloudFormation, either because you've removed it from the
  CDK application or because you've made a change that requires the resource
  to be replaced.

  The resource can be deleted (`RemovalPolicy.DESTROY`), or left in your AWS
  account for data recovery and cleanup later (`RemovalPolicy.RETAIN`).

- `with(...mixins: IMixin[]): IConstruct` — Applies one or more mixins to this construct.

  Mixins are applied in order. The list of constructs is captured at the
  start of the call, so constructs added by a mixin will not be visited.

  **Parameters**

  - `mixins` — The mixins to apply.

  **Returns:** This construct for chaining