diff --git a/.cursor/rules/README.md b/.cursor/rules/README.md
new file mode 100644
index 0000000..f5c1f87
--- /dev/null
+++ b/.cursor/rules/README.md
@@ -0,0 +1,5 @@
+# Cursor (optional)
+
+**Cursor** users: start at **[AGENTS.md](../../AGENTS.md)**. All conventions live in **`skills/*/SKILL.md`**.
+
+This folder only points contributors to **`AGENTS.md`** so editor-specific config does not duplicate the canonical docs.
diff --git a/.cursor/rules/code-review.mdc b/.cursor/rules/code-review.mdc
new file mode 100644
index 0000000..08165f0
--- /dev/null
+++ b/.cursor/rules/code-review.mdc
@@ -0,0 +1,25 @@
+---
+description: "PR checklist for @contentstack/core — exports, semver, errors, tests, consumers"
+alwaysApply: true
+---
+
+# Code review — `@contentstack/core`
+
+## Public API
+
+- **`src/index.ts`** exports match intended **npm `exports`**; new surface is documented and versioned.
+- Changes that affect **`@contentstack/delivery-sdk`** require a coordinated plan (bump **core** + **SDK** as needed).
+
+## Implementation
+
+- Axios / retry / serializer changes remain **backward compatible** unless this is a **major** release.
+- Errors use existing **classes** and **messages**; do not leak secrets in **logs** or **errors**.
+
+## Tests & quality
+
+- New logic includes **`test/*.spec.ts`** (or extends existing specs); **coverage thresholds** must still pass.
+- **Lint** clean.
+
+## Dependencies
+
+- New dependencies need justification (bundle size, maintenance, license).
diff --git a/.cursor/rules/contentstack-js-core.mdc b/.cursor/rules/contentstack-js-core.mdc
new file mode 100644
index 0000000..f72fa64
--- /dev/null
+++ b/.cursor/rules/contentstack-js-core.mdc
@@ -0,0 +1,24 @@
+---
+description: "@contentstack/core — Axios httpClient, errors, serialization, retry policies"
+globs: ["src/**/*.ts"]
+alwaysApply: false
+---
+
+# `@contentstack/core` implementation
+
+## HTTP
+
+- **`httpClient(options)`** in **`src/lib/contentstack-core.ts`** builds the **Axios** instance: **baseURL**, headers (**api_key**, **access_token**), **timeout**, **retryCondition** (e.g. **429**), **logHandler**, **versioningStrategy**, etc.
+- **`src/lib/request.ts`** and **`param-serializer.ts`** implement delivery-oriented query/body serialization — keep behavior aligned with CDA query expectations.
+
+## Errors
+
+- Use **`ContentstackError`** / **`ApiError`** and **`error-messages.ts`** for consistent messaging; preserve **status** / response metadata where applicable.
+
+## Retries
+
+- **`src/lib/retryPolicy/delivery-sdk-handlers.ts`** provides Axios interceptors (**retryRequestHandler**, **retryResponseHandler**, **retryResponseErrorHandler**) — changes here affect all consumers (including **@contentstack/delivery-sdk**).
+
+## Testing
+
+- Prefer **axios-mock-adapter** or mocks in **`test/utils`**; keep **`*.spec.ts`** focused and deterministic.
diff --git a/.cursor/rules/dev-workflow.md b/.cursor/rules/dev-workflow.md
new file mode 100644
index 0000000..8c8b709
--- /dev/null
+++ b/.cursor/rules/dev-workflow.md
@@ -0,0 +1,26 @@
+---
+description: "Branches, build, lint, and PR expectations for contentstack-js-core"
+globs: ["**/*.ts", "**/*.js", "**/*.json"]
+alwaysApply: false
+---
+
+# Development workflow — `@contentstack/core`
+
+## Before a PR
+
+1. **`npm run lint`** — must pass.
+2. **`npm test`** — Jest + coverage thresholds in `jest.config.ts` must be satisfied.
+3. **`npm run build`** — CJS, ESM, UMD, and types must compile.
+
+## API stability
+
+- This package is a **dependency of `@contentstack/delivery-sdk`**. Avoid breaking changes to exported functions, option shapes, or error types without a **semver-major** bump and coordinated **delivery-sdk** upgrade.
+- Keep **`package.json` `exports`** in sync with `src/index.ts`.
+
+## Versioning
+
+- Bump **`package.json` `version`** for releases that change published behavior (patch/minor/major per semver).
+
+## Links
+
+- [`AGENTS.md`](../../AGENTS.md) · [`skills/contentstack-js-core/SKILL.md`](../../skills/contentstack-js-core/SKILL.md)
diff --git a/.cursor/rules/testing.mdc b/.cursor/rules/testing.mdc
new file mode 100644
index 0000000..2894d10
--- /dev/null
+++ b/.cursor/rules/testing.mdc
@@ -0,0 +1,22 @@
+---
+description: "Jest tests and coverage for @contentstack/core"
+globs: ["test/**/*.ts"]
+alwaysApply: false
+---
+
+# Testing — contentstack-js-core
+
+## Runner
+
+- **Jest** + **ts-jest** — see **`jest.config.ts`** / **`jest.preset.js`** / **`tsconfig.spec.json`**.
+- **Coverage** is collected from **`src/**`** (with exclusions in config); **global thresholds** (branches/functions/lines/statements) apply — see `jest.config.ts`.
+
+## Layout
+
+- Specs: **`test/*.spec.ts`** (e.g. `request.spec.ts`, `contentstack-core.spec.ts`).
+- Shared mocks: **`test/utils/mocks.ts`**.
+
+## Hygiene
+
+- No **committed** `it.only` / `describe.only` meant for CI.
+- Avoid live network calls in unit tests unless explicitly an integration suite (this repo is primarily mocked unit tests).
diff --git a/.cursor/rules/typescript.mdc b/.cursor/rules/typescript.mdc
new file mode 100644
index 0000000..419e112
--- /dev/null
+++ b/.cursor/rules/typescript.mdc
@@ -0,0 +1,28 @@
+---
+description: "TypeScript and repo conventions for @contentstack/core"
+globs:
+  - "src/**/*.ts"
+  - "config/**/*.ts"
+  - "config/**/*.js"
+  - "tools/**/*.js"
+  - "jest.config.ts"
+  - "jest.preset.js"
+alwaysApply: false
+---
+
+# TypeScript — contentstack-js-core
+
+## Layout
+
+- **`src/lib/*.ts`** — implementation modules; **`src/index.ts`** re-exports the public surface.
+- **Configs** live under **`config/`** (multiple `tsconfig.*.json`, webpack).
+
+## Style
+
+- Follow **ESLint** (Airbnb TypeScript + Prettier) and existing patterns in `src/lib/`.
+- Prefer **explicit types** on public exports and Axios-related options.
+- Use **lodash** / **axios** patterns already present in `contentstack-core.ts` and `request.ts`.
+
+## Security
+
+- Do not log **api keys**, **access tokens**, or full auth headers in new code; align with existing **`logHandler`** usage.
diff --git a/.talismanrc b/.talismanrc
index ccb9bb1..4f799de 100644
--- a/.talismanrc
+++ b/.talismanrc
@@ -1,4 +1,4 @@
 fileignoreconfig:
 - filename: package-lock.json
-  checksum: 8b8088b2ef8210337d3a7f74d626b1ae4c2a4dcb0b5abab0c82e53e2d184eb04
+  checksum: c573bb4a5846055335df856bff87f28d9fccb90714ac4dbd699f5dcff2257615
 version: ""
\ No newline at end of file
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..3d608c6
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,43 @@
+# @contentstack/core – Agent guide
+
+**Universal entry point** for contributors and AI agents. Detailed conventions live in **`skills/*/SKILL.md`**.
+
+## What this repo is
+
+| Field | Detail |
+|--------|--------|
+| **Name:** | [contentstack-js-core](https://github.com/contentstack/contentstack-js-core) (`@contentstack/core`) |
+| **Purpose:** | TypeScript core library: HTTP client wiring, errors, serialization, retries—shared by Contentstack TS SDKs. |
+| **Out of scope:** | Not an end-user SDK; apps should use the Delivery SDK, which depends on this package. |
+
+## Tech stack (at a glance)
+
+| Area | Details |
+|------|---------|
+| Language | TypeScript (see `typescript` in `package.json`; `config/tsconfig.*.json`) |
+| Build | `tsc` (CJS/ESM/types) + Webpack UMD (`config/webpack.config.js`, `tools/`) |
+| Tests | Jest → `test/` (`npm test` → `jest ./test`) |
+| Lint / coverage | ESLint `.eslintrc.js` (`npm run lint`) |
+| CI | `.github/workflows/unit-test.yml`, `check-branch.yml`, `sca-scan.yml`, `policy-scan.yml`, `codeql-analysis.yml` |
+
+## Commands (quick reference)
+
+| Command type | Command |
+|--------------|---------|
+| Build | `npm run build` |
+| Test | `npm test` |
+| Lint | `npm run lint` |
+
+## Where the documentation lives: skills
+
+| Skill | Path | What it covers |
+|-------|------|----------------|
+| **Development workflow** | [`skills/dev-workflow/SKILL.md`](skills/dev-workflow/SKILL.md) | Branches, CI, npm scripts, Husky, release notes |
+| **Contentstack core (package)** | [`skills/contentstack-core/SKILL.md`](skills/contentstack-core/SKILL.md) | `@contentstack/core` boundaries, public surface, dependency role |
+| **TypeScript & layout** | [`skills/typescript/SKILL.md`](skills/typescript/SKILL.md) | `src/`, `config/` tsconfigs, ESM/CJS/UMD outputs |
+| **Testing** | [`skills/testing/SKILL.md`](skills/testing/SKILL.md) | Jest layout, mocks, fixtures |
+| **Code review** | [`skills/code-review/SKILL.md`](skills/code-review/SKILL.md) | PR expectations and checklist |
+
+## Using Cursor (optional)
+
+If you use **Cursor**, [`.cursor/rules/README.md`](.cursor/rules/README.md) only points to **`AGENTS.md`**—same docs as everyone else.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f49fb10..069ca78 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## Change log
 
+### Version: 1.3.14
+#### Date: May-04-2026
+ - Fix: Bump axios to ^1.15.2 (security patches for axios 1.15.0)
+
 ### Version: 1.3.13
 #### Date: April-15-2026
  - Fix: Axios version bump
@@ -88,7 +92,6 @@
 #### Date: Oct-22-2024
  - Fix: getData to receive params and headers both in data
 
-## Change log
 ### Version: 1.1.2
 #### Date: Oct-22-2024
  - Node version bump
diff --git a/package-lock.json b/package-lock.json
index 0039bd4..d25f3f8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,15 +1,15 @@
 {
   "name": "@contentstack/core",
-  "version": "1.3.13",
+  "version": "1.3.14",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@contentstack/core",
-      "version": "1.3.13",
+      "version": "1.3.14",
       "license": "MIT",
       "dependencies": {
-        "axios": "^1.15.0",
+        "axios": "^1.15.2",
         "axios-mock-adapter": "^2.1.0",
         "lodash": "^4.18.1",
         "qs": "6.15.1",
@@ -92,9 +92,9 @@
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     },
     "node_modules/@babel/compat-data": {
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@@ -263,9 +263,9 @@
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@@ -1520,9 +1520,9 @@
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@@ -3565,12 +3565,12 @@
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+      "resolved": "https://registry.npmjs.org/axios/-/axios-1.16.0.tgz",
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       "dependencies": {
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+        "follow-redirects": "^1.16.0",
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       "license": "MIT",
       "engines": {
@@ -9655,9 +9655,9 @@
       "license": "MIT"
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     "node_modules/node-releases": {
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-      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.37.tgz",
-      "integrity": "sha512-1h5gKZCF+pO/o3Iqt5Jp7wc9rH3eJJ0+nh/CIoiRwjRxde/hAHyLPXYN4V3CqKAbiZPSeJFSWHmJsbkicta0Eg==",
+      "version": "2.0.38",
+      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.38.tgz",
+      "integrity": "sha512-3qT/88Y3FbH/Kx4szpQQ4HzUbVrHPKTLVpVocKiLfoYvw9XSGOX2FmD2d6DrXbVYyAQTF2HeF6My8jmzx7/CRw==",
       "dev": true,
       "license": "MIT"
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@@ -10850,15 +10850,15 @@
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     "node_modules/safe-array-concat": {
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+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/safe-array-concat/-/safe-array-concat-1.1.4.tgz",
+      "integrity": "sha512-wtZlHyOje6OZTGqAoaDKxFkgRtkF9CnHAVnCHKfuj200wAgL+bSJhdsCD2l0Qx/2ekEXjPWcyKkfGb5CPboslg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "call-bind": "^1.0.8",
-        "call-bound": "^1.0.2",
-        "get-intrinsic": "^1.2.6",
+        "call-bind": "^1.0.9",
+        "call-bound": "^1.0.4",
+        "get-intrinsic": "^1.3.0",
         "has-symbols": "^1.1.0",
         "isarray": "^2.0.5"
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@@ -11577,9 +11577,9 @@
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+      "version": "5.46.2",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-5.46.2.tgz",
+      "integrity": "sha512-uxfo9fPcSgLDYob/w1FuL0c99MWiJDnv+5qXSQc5+Ki5NjVNsYi66INnMFBjf6uFz6OnX12piJQPF4IpjJTNTw==",
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@@ -11596,9 +11596,9 @@
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+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/terser-webpack-plugin/-/terser-webpack-plugin-5.5.0.tgz",
+      "integrity": "sha512-UYhptBwhWvfIjKd/UuFo6D8uq9xpGLDK+z8EDsj/zWhrTaH34cKEbrkMKfV5YWqGBvAYA3tlzZbs2R+qYrbQJA==",
       "dev": true,
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@@ -11898,14 +11898,14 @@
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-      "version": "5.20.1",
-      "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.20.1.tgz",
-      "integrity": "sha512-Qohcme7V1inbAfvjItgw0EaxVX5q2rdVEZHRBrEQdRZTssLDGsL8Lwrznl8oQ/6kuTJONLaDcGjkNP247XEhcA==",
+      "version": "5.21.0",
+      "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.21.0.tgz",
+      "integrity": "sha512-otxSQPw4lkOZWkHpB3zaEQs6gWYEsmX4xQF68ElXC/TWvGxGMSGOvoNbaLXm6/cS/fSfHtsEdw90y20PCd+sCA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "graceful-fs": "^4.2.4",
-        "tapable": "^2.3.0"
+        "tapable": "^2.3.3"
       },
       "engines": {
         "node": ">=10.13.0"
@@ -11935,9 +11935,9 @@
       }
     },
     "node_modules/ts-loader/node_modules/tapable": {
-      "version": "2.3.2",
-      "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.3.2.tgz",
-      "integrity": "sha512-1MOpMXuhGzGL5TTCZFItxCc0AARf1EZFQkGqMm7ERKj8+Hgr5oLvJOVFcC+lRmR8hCe2S3jC4T5D7Vg/d7/fhA==",
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.3.3.tgz",
+      "integrity": "sha512-uxc/zpqFg6x7C8vOE7lh6Lbda8eEL9zmVm/PLeTPBRhh1xCgdWaQ+J1CUieGpIfm2HdtsUpRv+HshiasBMcc6A==",
       "dev": true,
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@@ -12289,6 +12289,7 @@
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       "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
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+      "deprecated": "uuid@10 and below is no longer supported.  For ESM codebases, update to uuid@latest.  For CommonJS codebases, use uuid@11 (but be aware this version will likely be deprecated in 2028).",
       "dev": true,
       "license": "MIT",
       "bin": {
@@ -12400,9 +12401,9 @@
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+      "version": "5.106.2",
+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.106.2.tgz",
+      "integrity": "sha512-wGN3qcrBQIFmQ/c0AiOAQBvrZ5lmY8vbbMv4Mxfgzqd/B6+9pXtLo73WuS1dSGXM5QYY3hZnIbvx+K1xxe6FyA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -12422,9 +12423,8 @@
         "events": "^3.2.0",
         "glob-to-regexp": "^0.4.1",
         "graceful-fs": "^4.2.11",
-        "json-parse-even-better-errors": "^2.3.1",
         "loader-runner": "^4.3.1",
-        "mime-types": "^2.1.27",
+        "mime-db": "^1.54.0",
         "neo-async": "^2.6.2",
         "schema-utils": "^4.3.3",
         "tapable": "^2.3.0",
@@ -12532,9 +12532,9 @@
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     "node_modules/webpack-sources": {
-      "version": "3.3.4",
-      "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-3.3.4.tgz",
-      "integrity": "sha512-7tP1PdV4vF+lYPnkMR0jMY5/la2ub5Fc/8VQrrU+lXkiM6C4TjVfGw7iKfyhnTQOsD+6Q/iKw0eFciziRgD58Q==",
+      "version": "3.4.1",
+      "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-3.4.1.tgz",
+      "integrity": "sha512-eACpxRN02yaawnt+uUNIF7Qje6A9zArxBbcAJjK1PK3S9Ycg5jIuJ8pW4q8EMnwNZCEGltcjkRx1QzOxOkKD8A==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -12542,23 +12542,33 @@
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     },
     "node_modules/webpack/node_modules/enhanced-resolve": {
-      "version": "5.20.1",
-      "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.20.1.tgz",
-      "integrity": "sha512-Qohcme7V1inbAfvjItgw0EaxVX5q2rdVEZHRBrEQdRZTssLDGsL8Lwrznl8oQ/6kuTJONLaDcGjkNP247XEhcA==",
+      "version": "5.21.0",
+      "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.21.0.tgz",
+      "integrity": "sha512-otxSQPw4lkOZWkHpB3zaEQs6gWYEsmX4xQF68ElXC/TWvGxGMSGOvoNbaLXm6/cS/fSfHtsEdw90y20PCd+sCA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "graceful-fs": "^4.2.4",
-        "tapable": "^2.3.0"
+        "tapable": "^2.3.3"
       },
       "engines": {
         "node": ">=10.13.0"
       }
     },
+    "node_modules/webpack/node_modules/mime-db": {
+      "version": "1.54.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.54.0.tgz",
+      "integrity": "sha512-aU5EJuIN2WDemCcAp2vFBfp/m4EAhWJnUNSSw0ixs7/kXbd6Pg64EmwJkNdFhB8aWt1sH2CTXrLxo/iAGV3oPQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/webpack/node_modules/tapable": {
-      "version": "2.3.2",
-      "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.3.2.tgz",
-      "integrity": "sha512-1MOpMXuhGzGL5TTCZFItxCc0AARf1EZFQkGqMm7ERKj8+Hgr5oLvJOVFcC+lRmR8hCe2S3jC4T5D7Vg/d7/fhA==",
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.3.3.tgz",
+      "integrity": "sha512-uxc/zpqFg6x7C8vOE7lh6Lbda8eEL9zmVm/PLeTPBRhh1xCgdWaQ+J1CUieGpIfm2HdtsUpRv+HshiasBMcc6A==",
       "dev": true,
       "license": "MIT",
       "engines": {
diff --git a/package.json b/package.json
index c610520..f0ee5d7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@contentstack/core",
-  "version": "1.3.13",
+  "version": "1.3.14",
   "type": "commonjs",
   "main": "./dist/cjs/src/index.js",
   "types": "./dist/cjs/src/index.d.ts",
@@ -33,7 +33,7 @@
     "husky-check": "npx husky install && chmod +x .husky/pre-commit"
   },
   "dependencies": {
-    "axios": "^1.15.0",
+    "axios": "^1.15.2",
     "axios-mock-adapter": "^2.1.0",
     "lodash": "^4.18.1",
     "qs": "6.15.1",
diff --git a/skills/README.md b/skills/README.md
new file mode 100644
index 0000000..4849502
--- /dev/null
+++ b/skills/README.md
@@ -0,0 +1,10 @@
+# Project skills — `@contentstack/core`
+
+| Skill | When to use |
+|-------|-------------|
+| [`code-review/`](code-review/SKILL.md) | PR readiness, semver, consumer impact |
+| [`testing/`](testing/SKILL.md) | Jest, coverage thresholds, mocks |
+| [`contentstack-js-core/`](contentstack-js-core/SKILL.md) | httpClient, request, errors, retry handlers |
+| [`framework/`](framework/SKILL.md) | Axios pipeline, interceptors, serializers |
+
+**Overview:** [`AGENTS.md`](../AGENTS.md) · **Rules:** [`.cursor/rules/README.md`](../.cursor/rules/README.md)
diff --git a/skills/code-review/SKILL.md b/skills/code-review/SKILL.md
new file mode 100644
index 0000000..a4dbaa9
--- /dev/null
+++ b/skills/code-review/SKILL.md
@@ -0,0 +1,27 @@
+---
+name: code-review
+description: Use when reviewing PRs or preparing changes for contentstack-js-core—API stability, tests, and consumer impact.
+---
+
+# Code review – contentstack-js-core
+
+## When to use
+
+- Authoring or reviewing a PR
+- Judging whether a change is safe for downstream SDKs
+
+## Instructions
+
+### Checklist
+
+- **API / exports**: Any change to public exports or types that could break `@contentstack/delivery-sdk` or other consumers?
+- **Behavior**: Retries, errors, and serialization remain backward compatible unless semver major.
+- **Tests**: New logic covered; existing tests updated when semantics change.
+- **Build**: `npm run build` and `npm test` and `npm run lint` succeed.
+- **Security / deps**: Dependency bumps justified; no secrets in code or tests.
+
+### Severity hints
+
+- **Blocker**: Breaking change without major version or failing CI.
+- **Major**: Missing tests for risky HTTP/error changes.
+- **Minor**: Style, naming, or internal refactors with full green CI.
diff --git a/skills/contentstack-core/SKILL.md b/skills/contentstack-core/SKILL.md
new file mode 100644
index 0000000..1d07a9d
--- /dev/null
+++ b/skills/contentstack-core/SKILL.md
@@ -0,0 +1,28 @@
+---
+name: contentstack-core
+description: Use when working on @contentstack/core API surface, HTTP layer, errors, or how other SDKs consume this package.
+---
+
+# Contentstack core package – contentstack-js-core
+
+## When to use
+
+- Adding or changing modules under `src/`
+- Adjusting Axios usage, retries, error types, or serialization
+- Explaining how Delivery SDK pulls in this dependency
+
+## Instructions
+
+### Role of the package
+
+- Published as **`@contentstack/core`**; it is an **internal building block** for Contentstack TypeScript SDKs, not a standalone app SDK for stack users.
+- Entry points and exports are defined via `package.json` `exports` and build outputs under `dist/`.
+
+### Boundaries
+
+- Prefer stable, documented behavior for HTTP, errors, and request helpers—downstream SDKs rely on consistent error shapes and retry semantics.
+- Coordinate version bumps with consumers (e.g. `contentstack-typescript`) when changing public types or behavior.
+
+### Versioning
+
+- Follow semver for releases; breaking changes require a major bump and coordinated updates in dependent packages.
diff --git a/skills/contentstack-js-core/SKILL.md b/skills/contentstack-js-core/SKILL.md
new file mode 100644
index 0000000..762cb06
--- /dev/null
+++ b/skills/contentstack-js-core/SKILL.md
@@ -0,0 +1,32 @@
+---
+name: contentstack-js-core
+description: @contentstack/core — httpClient, request helpers, param serialization, errors, delivery retry handlers.
+---
+
+# `@contentstack/core` skill
+
+Internal library for **Contentstack TypeScript/JavaScript SDKs**. Prefer **`@contentstack/delivery-sdk`** for app code.
+
+## Modules
+
+| Module | Responsibility |
+|--------|----------------|
+| **`contentstack-core.ts`** | **`httpClient`**: Axios create, defaults, **apiKey** / **accessToken** → headers, **retryCondition**, **logHandler** |
+| **`request.ts`** | Request execution helpers used with the client |
+| **`param-serializer.ts`** | Query/body serialization for CDA-style calls |
+| **`contentstack-error.ts`**, **`api-error.ts`** | Typed errors |
+| **`retryPolicy/delivery-sdk-handlers.ts`** | Retry interceptors composed with **`httpClient`** in consumers |
+| **`types.ts`** | **HttpClientParams**, etc. |
+
+## Changing behavior
+
+- Coordinate with **`contentstack-typescript`** when changing interceptor signatures, default timeouts, or error shapes.
+- Run **`npm test`** and **`npm run build`** before PR.
+
+## Docs
+
+- [Content Delivery API](https://www.contentstack.com/docs/developers/apis/content-delivery-api/) (consumer semantics)
+
+## Rule shortcut
+
+- `.cursor/rules/contentstack-js-core.mdc`
diff --git a/skills/dev-workflow/SKILL.md b/skills/dev-workflow/SKILL.md
new file mode 100644
index 0000000..2bc47c9
--- /dev/null
+++ b/skills/dev-workflow/SKILL.md
@@ -0,0 +1,31 @@
+---
+name: dev-workflow
+description: Use when changing branches, CI, npm scripts, Husky hooks, or release workflow in contentstack-js-core.
+---
+
+# Development workflow – contentstack-js-core
+
+## When to use
+
+- Planning a change that touches build, test, or CI
+- Onboarding to how PRs and checks run for this repo
+
+## Instructions
+
+### Branches and integration
+
+- Default branch is **`main`**; `development` also exists—match team practice for PR targets.
+- GitHub Actions under `.github/workflows/` run tests, branch checks, SCA, policy, and CodeQL—coordinate schema changes with those jobs.
+
+### Commands
+
+- Install: `npm ci` (or `npm install` for local dev).
+- Build: `npm run build` (CJS + ESM + UMD + types).
+- Test: `npm test`.
+- Lint: `npm run lint`.
+- `prepare` runs build and Husky setup—expect hooks after install.
+
+### PR expectations
+
+- Keep changes scoped; this package is consumed by other SDKs—avoid breaking exports without semver alignment.
+- Ensure `npm run build` and `npm test` pass locally before opening a PR.
diff --git a/skills/framework/SKILL.md b/skills/framework/SKILL.md
new file mode 100644
index 0000000..ad90957
--- /dev/null
+++ b/skills/framework/SKILL.md
@@ -0,0 +1,26 @@
+---
+name: framework
+description: Axios HTTP stack in @contentstack/core — clients, retries, serialization pipeline.
+---
+
+# Framework skill — HTTP layer (`@contentstack/core`)
+
+## Flow
+
+1. **`httpClient(params)`** returns a configured **Axios** instance (**baseURL**, **headers**, **timeout**, adapters).
+2. **Interceptors** from **`retryPolicy/delivery-sdk-handlers.ts`** may be attached by consumers for retry-on-429-style behavior.
+3. **Serialization** via **`param-serializer`** ensures query strings match API expectations.
+
+## When to edit
+
+- **Global defaults** (timeout, retry predicate) → **`contentstack-core.ts`**.
+- **Query encoding** → **`param-serializer.ts`** (watch for regressions in delivery-sdk tests).
+- **Retry timing / idempotency** → **`retryPolicy/delivery-sdk-handlers.ts`**.
+
+## Tests
+
+- **`test/request.spec.ts`**, **`test/contentstack-core.spec.ts`**, retry specs under **`test/retryPolicy/`** — extend when altering behavior.
+
+## Rule shortcut
+
+- `.cursor/rules/contentstack-js-core.mdc` · `.cursor/rules/typescript.mdc`
diff --git a/skills/testing/SKILL.md b/skills/testing/SKILL.md
new file mode 100644
index 0000000..1b5d865
--- /dev/null
+++ b/skills/testing/SKILL.md
@@ -0,0 +1,23 @@
+---
+name: testing
+description: Use when writing or fixing Jest tests, mocks, or test layout under test/ in contentstack-js-core.
+---
+
+# Testing – contentstack-js-core
+
+## When to use
+
+- Adding coverage for new `src/` behavior
+- Fixing flaky or outdated tests under `test/`
+
+## Instructions
+
+### Runner and layout
+
+- **Jest** is configured for this repo; tests live under **`test/`** (`npm test` runs `jest ./test`).
+- Prefer focused unit tests near the behavior under test; use mocks for HTTP where `axios` or adapters are involved.
+
+### Practice
+
+- Run the full suite before merging: `npm test`.
+- Keep tests deterministic—no live network calls to Contentstack APIs in CI unless a dedicated integration job exists and secrets are available.
diff --git a/skills/typescript/SKILL.md b/skills/typescript/SKILL.md
new file mode 100644
index 0000000..86eedba
--- /dev/null
+++ b/skills/typescript/SKILL.md
@@ -0,0 +1,24 @@
+---
+name: typescript
+description: Use for TypeScript layout, tsconfig variants, and build outputs (CJS/ESM/UMD/types) in contentstack-js-core.
+---
+
+# TypeScript & repo layout – contentstack-js-core
+
+## When to use
+
+- Editing `config/tsconfig.*.json` or build pipelines
+- Adding new source files under `src/`
+- Debugging dual CJS/ESM/UMD output issues
+
+## Instructions
+
+### Layout
+
+- Source lives under **`src/`**; compiled artifacts go to **`dist/`** via separate targets (`build:cjs`, `build:esm`, `build:umd`, `build:types`).
+- **`config/`** holds TypeScript and Webpack configs—keep them in sync when adding path aliases or new entry files.
+
+### Tooling
+
+- TypeScript version is pinned in `package.json`—upgrade deliberately with full `npm run build` and `npm test`.
+- ESLint uses `.eslintrc.js`; run `npm run lint` after structural refactors.