diff --git a/jest.config.js b/jest.config.js
index 272fc8594..24da6a51e 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 /** @type {import('ts-jest').JestConfigWithTsJest} */
 module.exports = {
   preset: 'ts-jest',
diff --git a/tools/helpers.ts b/tools/helpers.ts
index 276d7f9f3..49b7218f1 100644
--- a/tools/helpers.ts
+++ b/tools/helpers.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import fs from 'fs'
 import path from 'path'
 import YAML from 'yaml'
diff --git a/tools/src/Logger.ts b/tools/src/Logger.ts
index 165deda19..3585f1ecb 100644
--- a/tools/src/Logger.ts
+++ b/tools/src/Logger.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 export enum LogLevel {
   error = 1,
   warn = 2,
diff --git a/tools/src/coverage/CoverageCalculator.ts b/tools/src/coverage/CoverageCalculator.ts
index 9662e35e3..090e0ecb1 100644
--- a/tools/src/coverage/CoverageCalculator.ts
+++ b/tools/src/coverage/CoverageCalculator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type OpenAPIV3 } from 'openapi-types'
 import { HTTP_METHODS, read_yaml, write_json } from '../../helpers'
 
diff --git a/tools/src/coverage/coverage.ts b/tools/src/coverage/coverage.ts
index 8acd80d6e..5b5dede7e 100644
--- a/tools/src/coverage/coverage.ts
+++ b/tools/src/coverage/coverage.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { Command, Option } from '@commander-js/extra-typings'
 import CoverageCalculator from './CoverageCalculator'
 import { resolve } from 'path'
diff --git a/tools/src/dump-cluster-spec/dump-cluster-spec.ts b/tools/src/dump-cluster-spec/dump-cluster-spec.ts
index 1d3de6bae..bb7bd96de 100644
--- a/tools/src/dump-cluster-spec/dump-cluster-spec.ts
+++ b/tools/src/dump-cluster-spec/dump-cluster-spec.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { Command, Option } from '@commander-js/extra-typings'
 import { resolve } from 'path'
 import axios from 'axios'
diff --git a/tools/src/linter/InlineObjectSchemaValidator.ts b/tools/src/linter/InlineObjectSchemaValidator.ts
index 892c9af6a..460832f6f 100644
--- a/tools/src/linter/InlineObjectSchemaValidator.ts
+++ b/tools/src/linter/InlineObjectSchemaValidator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import type NamespacesFolder from './components/NamespacesFolder'
 import type SchemasFolder from './components/SchemasFolder'
 import { type ValidationError } from 'types'
diff --git a/tools/src/linter/SchemaRefsValidator.ts b/tools/src/linter/SchemaRefsValidator.ts
index ae5af24fb..f39ec20e0 100644
--- a/tools/src/linter/SchemaRefsValidator.ts
+++ b/tools/src/linter/SchemaRefsValidator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import type NamespacesFolder from './components/NamespacesFolder'
 import type SchemasFolder from './components/SchemasFolder'
 import { type ValidationError } from 'types'
diff --git a/tools/src/linter/SchemasValidator.ts b/tools/src/linter/SchemasValidator.ts
index 21ca3630a..2550d7f89 100644
--- a/tools/src/linter/SchemasValidator.ts
+++ b/tools/src/linter/SchemasValidator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import AJV from 'ajv'
 import addFormats from 'ajv-formats'
 import OpenApiMerger from '../merger/OpenApiMerger'
diff --git a/tools/src/linter/SpecValidator.ts b/tools/src/linter/SpecValidator.ts
index 51ccf2a27..f953b1efc 100644
--- a/tools/src/linter/SpecValidator.ts
+++ b/tools/src/linter/SpecValidator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import SchemasFolder from './components/SchemasFolder'
 import NamespacesFolder from './components/NamespacesFolder'
 import { type ValidationError } from 'types'
diff --git a/tools/src/linter/components/InfoFile.ts b/tools/src/linter/components/InfoFile.ts
index 791beda41..02608724c 100644
--- a/tools/src/linter/components/InfoFile.ts
+++ b/tools/src/linter/components/InfoFile.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import FileValidator from './base/FileValidator'
 
 export default class InfoFile extends FileValidator {
diff --git a/tools/src/linter/components/NamespaceFile.ts b/tools/src/linter/components/NamespaceFile.ts
index 8bfe67f17..c6f5799ff 100644
--- a/tools/src/linter/components/NamespaceFile.ts
+++ b/tools/src/linter/components/NamespaceFile.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type OpenAPIV3 } from 'openapi-types'
 import { type OperationSpec, type ValidationError } from 'types'
 import OperationGroup from './OperationGroup'
diff --git a/tools/src/linter/components/NamespacesFolder.ts b/tools/src/linter/components/NamespacesFolder.ts
index a1c10003c..d7ebf4371 100644
--- a/tools/src/linter/components/NamespacesFolder.ts
+++ b/tools/src/linter/components/NamespacesFolder.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import NamespaceFile from './NamespaceFile'
 import { type ValidationError } from 'types'
 import FolderValidator from './base/FolderValidator'
diff --git a/tools/src/linter/components/Operation.ts b/tools/src/linter/components/Operation.ts
index 99a93c3c1..44c734272 100644
--- a/tools/src/linter/components/Operation.ts
+++ b/tools/src/linter/components/Operation.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type OperationSpec, type ValidationError } from 'types'
 import _ from 'lodash'
 import ValidatorBase from './base/ValidatorBase'
diff --git a/tools/src/linter/components/OperationGroup.ts b/tools/src/linter/components/OperationGroup.ts
index f99cb9ab3..5daa6adce 100644
--- a/tools/src/linter/components/OperationGroup.ts
+++ b/tools/src/linter/components/OperationGroup.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import type Operation from './Operation'
 import { type ValidationError } from 'types'
 import ValidatorBase from './base/ValidatorBase'
diff --git a/tools/src/linter/components/Schema.ts b/tools/src/linter/components/Schema.ts
index d132f86e3..9178950a0 100644
--- a/tools/src/linter/components/Schema.ts
+++ b/tools/src/linter/components/Schema.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import ValidatorBase from './base/ValidatorBase'
 import { type OpenAPIV3 } from 'openapi-types'
 import { type ValidationError } from 'types'
diff --git a/tools/src/linter/components/SchemaFile.ts b/tools/src/linter/components/SchemaFile.ts
index 8fa364b13..4adae3472 100644
--- a/tools/src/linter/components/SchemaFile.ts
+++ b/tools/src/linter/components/SchemaFile.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import FileValidator from './base/FileValidator'
 import { type ValidationError } from 'types'
 import Schema from './Schema'
diff --git a/tools/src/linter/components/SchemasFolder.ts b/tools/src/linter/components/SchemasFolder.ts
index d6d30fd6a..a44cc3add 100644
--- a/tools/src/linter/components/SchemasFolder.ts
+++ b/tools/src/linter/components/SchemasFolder.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import SchemaFile from './SchemaFile'
 import FolderValidator from './base/FolderValidator'
 import { type ValidationError } from 'types'
diff --git a/tools/src/linter/components/SupersededOperationsFile.ts b/tools/src/linter/components/SupersededOperationsFile.ts
index 3591ede8e..47b34fe9f 100644
--- a/tools/src/linter/components/SupersededOperationsFile.ts
+++ b/tools/src/linter/components/SupersededOperationsFile.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import FileValidator from './base/FileValidator'
 
 export default class SupersededOperationsFile extends FileValidator {
diff --git a/tools/src/linter/components/base/FileValidator.ts b/tools/src/linter/components/base/FileValidator.ts
index 6941458ba..2ed0aa128 100644
--- a/tools/src/linter/components/base/FileValidator.ts
+++ b/tools/src/linter/components/base/FileValidator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import ValidatorBase from './ValidatorBase'
 import { type ValidationError } from 'types'
 import { type OpenAPIV3 } from 'openapi-types'
diff --git a/tools/src/linter/components/base/FolderValidator.ts b/tools/src/linter/components/base/FolderValidator.ts
index 8a63644dc..0c7aa47fb 100644
--- a/tools/src/linter/components/base/FolderValidator.ts
+++ b/tools/src/linter/components/base/FolderValidator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import fs from 'fs'
 import ValidatorBase from './ValidatorBase'
 import type FileValidator from './FileValidator'
diff --git a/tools/src/linter/components/base/ValidatorBase.ts b/tools/src/linter/components/base/ValidatorBase.ts
index 3790218bf..d92df8256 100644
--- a/tools/src/linter/components/base/ValidatorBase.ts
+++ b/tools/src/linter/components/base/ValidatorBase.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type ValidationError } from 'types'
 export default class ValidatorBase {
   file: string
diff --git a/tools/src/linter/lint.ts b/tools/src/linter/lint.ts
index 6b30fa1d8..f6ddcf5dd 100644
--- a/tools/src/linter/lint.ts
+++ b/tools/src/linter/lint.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { Command, Option } from '@commander-js/extra-typings'
 import SpecValidator from './SpecValidator'
 import { resolve } from 'path'
diff --git a/tools/src/linter/utils/SpecificationVisitor.ts b/tools/src/linter/utils/SpecificationVisitor.ts
index d94731a73..b97a636e4 100644
--- a/tools/src/linter/utils/SpecificationVisitor.ts
+++ b/tools/src/linter/utils/SpecificationVisitor.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { is_array_schema, is_ref, type KeysMatching, type MaybeRef, type SpecificationContext } from './index'
 import { OpenAPIV3 } from 'openapi-types'
 
diff --git a/tools/src/linter/utils/index.ts b/tools/src/linter/utils/index.ts
index db451638f..2a9c67996 100644
--- a/tools/src/linter/utils/index.ts
+++ b/tools/src/linter/utils/index.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type OpenAPIV3 } from 'openapi-types'
 import { type ValidationError } from 'types'
 
diff --git a/tools/src/merger/GlobalParamsGenerator.ts b/tools/src/merger/GlobalParamsGenerator.ts
index d883e0812..8077db00f 100644
--- a/tools/src/merger/GlobalParamsGenerator.ts
+++ b/tools/src/merger/GlobalParamsGenerator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type OpenAPIV3 } from 'openapi-types'
 import _ from 'lodash'
 import { read_yaml } from '../../helpers'
diff --git a/tools/src/merger/OpenApiMerger.ts b/tools/src/merger/OpenApiMerger.ts
index a541293d7..4cded34bb 100644
--- a/tools/src/merger/OpenApiMerger.ts
+++ b/tools/src/merger/OpenApiMerger.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type OpenAPIV3 } from 'openapi-types'
 import fs from 'fs'
 import _ from 'lodash'
diff --git a/tools/src/merger/OpenDistro.ts b/tools/src/merger/OpenDistro.ts
index b3d1d431d..f7081ce06 100644
--- a/tools/src/merger/OpenDistro.ts
+++ b/tools/src/merger/OpenDistro.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type HttpVerb, type OperationPath, type SupersededOperationMap } from 'types'
 import { read_yaml, write_yaml } from '../../helpers'
 
diff --git a/tools/src/merger/SupersededOpsGenerator.ts b/tools/src/merger/SupersededOpsGenerator.ts
index 39570aaf0..57b8c91c8 100644
--- a/tools/src/merger/SupersededOpsGenerator.ts
+++ b/tools/src/merger/SupersededOpsGenerator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type OperationSpec, type SupersededOperationMap } from 'types'
 import _ from 'lodash'
 import { read_yaml } from '../../helpers'
diff --git a/tools/src/merger/merge.ts b/tools/src/merger/merge.ts
index c38f29c97..470a274fe 100644
--- a/tools/src/merger/merge.ts
+++ b/tools/src/merger/merge.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { Command, Option } from '@commander-js/extra-typings'
 import OpenApiMerger from './OpenApiMerger'
 import { resolve } from 'path'
diff --git a/tools/src/tester/Ansi.ts b/tools/src/tester/Ansi.ts
index 64e47192a..cbc9b3d40 100644
--- a/tools/src/tester/Ansi.ts
+++ b/tools/src/tester/Ansi.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 export function b (text: string): string { return `\x1b[1m${text}\x1b[0m` }
 export function i (text: string): string { return `\x1b[3m${text}\x1b[0m` }
 
diff --git a/tools/src/tester/ChapterEvaluator.ts b/tools/src/tester/ChapterEvaluator.ts
index 03b3c6497..1b2161170 100644
--- a/tools/src/tester/ChapterEvaluator.ts
+++ b/tools/src/tester/ChapterEvaluator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type Chapter, type ActualResponse } from './types/story.types'
 import { type ChapterEvaluation, type Evaluation, Result } from './types/eval.types'
 import { type ParsedOperation } from './types/spec.types'
diff --git a/tools/src/tester/ChapterReader.ts b/tools/src/tester/ChapterReader.ts
index f8a962709..445508328 100644
--- a/tools/src/tester/ChapterReader.ts
+++ b/tools/src/tester/ChapterReader.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import axios from 'axios'
 import { type ChapterRequest, type ActualResponse, type Parameter } from './types/story.types'
 import { Agent } from 'https'
diff --git a/tools/src/tester/ResultsDisplayer.ts b/tools/src/tester/ResultsDisplayer.ts
index 7a0d04f47..cb79fcaa9 100644
--- a/tools/src/tester/ResultsDisplayer.ts
+++ b/tools/src/tester/ResultsDisplayer.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type ChapterEvaluation, type Evaluation, Result, type StoryEvaluation } from './types/eval.types'
 import { overall_result } from './helpers'
 import * as ansi from './Ansi'
diff --git a/tools/src/tester/SchemaValidator.ts b/tools/src/tester/SchemaValidator.ts
index 4f9c91896..73db0ad3d 100644
--- a/tools/src/tester/SchemaValidator.ts
+++ b/tools/src/tester/SchemaValidator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import AJV from 'ajv'
 import addFormats from 'ajv-formats'
 import { type OpenAPIV3 } from 'openapi-types'
diff --git a/tools/src/tester/SharedResources.ts b/tools/src/tester/SharedResources.ts
index c03a3fb13..cf56dc87e 100644
--- a/tools/src/tester/SharedResources.ts
+++ b/tools/src/tester/SharedResources.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import type ChapterReader from './ChapterReader'
 import type SchemaValidator from './SchemaValidator'
 import type SpecParser from './SpecParser'
diff --git a/tools/src/tester/SpecParser.ts b/tools/src/tester/SpecParser.ts
index ecc171f8e..3ee4ba875 100644
--- a/tools/src/tester/SpecParser.ts
+++ b/tools/src/tester/SpecParser.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type OpenAPIV3 } from 'openapi-types'
 import { resolve_ref } from '../../helpers'
 import { type Chapter } from './types/story.types'
diff --git a/tools/src/tester/StoryEvaluator.ts b/tools/src/tester/StoryEvaluator.ts
index 7c049125c..68cf97bcf 100644
--- a/tools/src/tester/StoryEvaluator.ts
+++ b/tools/src/tester/StoryEvaluator.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type Chapter, type Story, type SupplementalChapter } from './types/story.types'
 import { type ChapterEvaluation, Result, type StoryEvaluation } from './types/eval.types'
 import ChapterEvaluator from './ChapterEvaluator'
diff --git a/tools/src/tester/TestsRunner.ts b/tools/src/tester/TestsRunner.ts
index a5ba0689f..e9a1a7e18 100644
--- a/tools/src/tester/TestsRunner.ts
+++ b/tools/src/tester/TestsRunner.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type OpenAPIV3 } from 'openapi-types'
 import SpecParser from './SpecParser'
 import ChapterReader from './ChapterReader'
diff --git a/tools/src/tester/_generate_story_types.ts b/tools/src/tester/_generate_story_types.ts
index dc497d288..98e9ed1f6 100644
--- a/tools/src/tester/_generate_story_types.ts
+++ b/tools/src/tester/_generate_story_types.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import * as js2ts from 'json-schema-to-typescript'
 import fs from 'fs'
 import { read_yaml } from '../../helpers'
diff --git a/tools/src/tester/helpers.ts b/tools/src/tester/helpers.ts
index 1c5e78257..4dd7abe66 100644
--- a/tools/src/tester/helpers.ts
+++ b/tools/src/tester/helpers.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type Evaluation, Result } from './types/eval.types'
 
 export function overall_result (evaluations: Evaluation[]): Result {
diff --git a/tools/src/tester/start.ts b/tools/src/tester/start.ts
index 7cbe9a2ab..83b10f34c 100644
--- a/tools/src/tester/start.ts
+++ b/tools/src/tester/start.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import OpenApiMerger from '../merger/OpenApiMerger'
 import { LogLevel } from '../Logger'
 import TestsRunner from './TestsRunner'
diff --git a/tools/src/tester/types/eval.types.ts b/tools/src/tester/types/eval.types.ts
index 95f9e7af7..5e4f798cc 100644
--- a/tools/src/tester/types/eval.types.ts
+++ b/tools/src/tester/types/eval.types.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 export type LibraryEvaluation = StoryEvaluation[]
 
 export interface StoryEvaluation {
diff --git a/tools/src/tester/types/spec.types.ts b/tools/src/tester/types/spec.types.ts
index 6a34db327..06689a9eb 100644
--- a/tools/src/tester/types/spec.types.ts
+++ b/tools/src/tester/types/spec.types.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type OpenAPIV3 } from 'openapi-types'
 
 export type ParsedOperation = OpenAPIV3.OperationObject & {
diff --git a/tools/src/types.ts b/tools/src/types.ts
index 083a05f72..a9497dbcb 100644
--- a/tools/src/types.ts
+++ b/tools/src/types.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { type OpenAPIV3 } from 'openapi-types'
 
 export interface OperationSpec extends OpenAPIV3.OperationObject {
diff --git a/tools/tests/linter/InfoFile.test.ts b/tools/tests/linter/InfoFile.test.ts
index e93f2ea0e..5ae09cbfd 100644
--- a/tools/tests/linter/InfoFile.test.ts
+++ b/tools/tests/linter/InfoFile.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import InfoFile from 'linter/components/InfoFile'
 
 test('validate()', () => {
diff --git a/tools/tests/linter/InlineObjectSchemaValidator.test.ts b/tools/tests/linter/InlineObjectSchemaValidator.test.ts
index 6cff2d2c1..8efeea258 100644
--- a/tools/tests/linter/InlineObjectSchemaValidator.test.ts
+++ b/tools/tests/linter/InlineObjectSchemaValidator.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import SchemasFolder from 'linter/components/SchemasFolder'
 import NamespacesFolder from 'linter/components/NamespacesFolder'
 import InlineObjectSchemaValidator from 'linter/InlineObjectSchemaValidator'
diff --git a/tools/tests/linter/NamespaceFile.test.ts b/tools/tests/linter/NamespaceFile.test.ts
index 51fe30339..16513288c 100644
--- a/tools/tests/linter/NamespaceFile.test.ts
+++ b/tools/tests/linter/NamespaceFile.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { mocked_namespace_file, namespace_file } from './factories/namespace_file'
 
 test('constructor()', () => {
diff --git a/tools/tests/linter/NamespacesFolder.test.ts b/tools/tests/linter/NamespacesFolder.test.ts
index 08b1ac854..677aa5996 100644
--- a/tools/tests/linter/NamespacesFolder.test.ts
+++ b/tools/tests/linter/NamespacesFolder.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import NamespacesFolder from 'linter/components/NamespacesFolder'
 
 test('validate() - When there invalid files', () => {
diff --git a/tools/tests/linter/Operation.test.ts b/tools/tests/linter/Operation.test.ts
index f7426a29d..93a7c0e3e 100644
--- a/tools/tests/linter/Operation.test.ts
+++ b/tools/tests/linter/Operation.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { mocked_operation, operation } from './factories/operation'
 
 test('validate_group()', () => {
diff --git a/tools/tests/linter/OperationGroup.test.ts b/tools/tests/linter/OperationGroup.test.ts
index 564cab7b5..9ad7c1f65 100644
--- a/tools/tests/linter/OperationGroup.test.ts
+++ b/tools/tests/linter/OperationGroup.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { mocked_operation_group, operation_group } from './factories/operation_group'
 
 test('validate_description()', () => {
diff --git a/tools/tests/linter/Schema.test.ts b/tools/tests/linter/Schema.test.ts
index 60319b128..d52492247 100644
--- a/tools/tests/linter/Schema.test.ts
+++ b/tools/tests/linter/Schema.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { schema } from './factories/schema'
 
 test('validate_name()', () => {
diff --git a/tools/tests/linter/SchemaFile.test.ts b/tools/tests/linter/SchemaFile.test.ts
index ad6b9d897..2d6e0c40c 100644
--- a/tools/tests/linter/SchemaFile.test.ts
+++ b/tools/tests/linter/SchemaFile.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { mocked_schema_file, schema_file } from './factories/schema_file'
 
 test('validate_category()', () => {
diff --git a/tools/tests/linter/SchemaRefsValidator.test.ts b/tools/tests/linter/SchemaRefsValidator.test.ts
index 7cae50ad1..997e4af6a 100644
--- a/tools/tests/linter/SchemaRefsValidator.test.ts
+++ b/tools/tests/linter/SchemaRefsValidator.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import SchemasFolder from 'linter/components/SchemasFolder'
 import NamespacesFolder from 'linter/components/NamespacesFolder'
 import SchemaRefsValidator from 'linter/SchemaRefsValidator'
diff --git a/tools/tests/linter/SchemasValidator.test.ts b/tools/tests/linter/SchemasValidator.test.ts
index cbd16a998..4713dc539 100644
--- a/tools/tests/linter/SchemasValidator.test.ts
+++ b/tools/tests/linter/SchemasValidator.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import SchemasValidator from '../../src/linter/SchemasValidator'
 
 test('validate() - named_schemas', () => {
diff --git a/tools/tests/linter/SpecValidator.test.ts b/tools/tests/linter/SpecValidator.test.ts
index 7658ee860..b62b13234 100644
--- a/tools/tests/linter/SpecValidator.test.ts
+++ b/tools/tests/linter/SpecValidator.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import SpecValidator from 'linter/SpecValidator'
 
 test('validate()', () => {
diff --git a/tools/tests/linter/SupersededOperationsFile.test.ts b/tools/tests/linter/SupersededOperationsFile.test.ts
index 5c97edfff..13102d45c 100644
--- a/tools/tests/linter/SupersededOperationsFile.test.ts
+++ b/tools/tests/linter/SupersededOperationsFile.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import SupersededOperationsFile from 'linter/components/SupersededOperationsFile'
 
 test('validate()', () => {
diff --git a/tools/tests/linter/factories/namespace_file.ts b/tools/tests/linter/factories/namespace_file.ts
index 7c130de4d..f38ea0e35 100644
--- a/tools/tests/linter/factories/namespace_file.ts
+++ b/tools/tests/linter/factories/namespace_file.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import NamespaceFile from 'linter/components/NamespaceFile'
 import { type OpenAPIV3 } from 'openapi-types'
 import { mocked_operation_group } from './operation_group'
diff --git a/tools/tests/linter/factories/operation.ts b/tools/tests/linter/factories/operation.ts
index 208dd1e86..d2ee7f883 100644
--- a/tools/tests/linter/factories/operation.ts
+++ b/tools/tests/linter/factories/operation.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import Operation from 'linter/components/Operation'
 import { type OperationSpec } from 'types'
 
diff --git a/tools/tests/linter/factories/operation_group.ts b/tools/tests/linter/factories/operation_group.ts
index 7a8cd6c1b..1e5fa04c6 100644
--- a/tools/tests/linter/factories/operation_group.ts
+++ b/tools/tests/linter/factories/operation_group.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import OperationGroup from 'linter/components/OperationGroup'
 import { operation, mocked_operation } from './operation'
 
diff --git a/tools/tests/linter/factories/schema.ts b/tools/tests/linter/factories/schema.ts
index bdaec547c..b9e8de772 100644
--- a/tools/tests/linter/factories/schema.ts
+++ b/tools/tests/linter/factories/schema.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import Schema from 'linter/components/Schema'
 import { type OpenAPIV3 } from 'openapi-types'
 
diff --git a/tools/tests/linter/factories/schema_file.ts b/tools/tests/linter/factories/schema_file.ts
index b19c9724f..8c0a0bb4e 100644
--- a/tools/tests/linter/factories/schema_file.ts
+++ b/tools/tests/linter/factories/schema_file.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { mocked_schema } from './schema'
 import SchemaFile from 'linter/components/SchemaFile'
 
diff --git a/tools/tests/merger/OpenApiMerger.test.ts b/tools/tests/merger/OpenApiMerger.test.ts
index 33146327f..00e4ed4ba 100644
--- a/tools/tests/merger/OpenApiMerger.test.ts
+++ b/tools/tests/merger/OpenApiMerger.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import OpenApiMerger from 'merger/OpenApiMerger'
 import fs from 'fs'
 import { LogLevel } from '../../src/Logger'
diff --git a/tools/tests/tester/ansi.test.ts b/tools/tests/tester/ansi.test.ts
index aa163444b..0d7d37c14 100644
--- a/tools/tests/tester/ansi.test.ts
+++ b/tools/tests/tester/ansi.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import * as ansi from '../../src/tester/Ansi'
 
 test('b', async () => {
diff --git a/tools/tests/tester/start.test.ts b/tools/tests/tester/start.test.ts
index 3d7a81ba0..2f0f569c9 100644
--- a/tools/tests/tester/start.test.ts
+++ b/tools/tests/tester/start.test.ts
@@ -1,3 +1,12 @@
+/*
+* Copyright OpenSearch Contributors
+* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 import { spawnSync } from 'child_process'
 import * as ansi from '../../src/tester/Ansi'