diff --git a/.codecov.yml b/.codecov.yml
new file mode 100644
index 0000000..d60f452
--- /dev/null
+++ b/.codecov.yml
@@ -0,0 +1,14 @@
+coverage:
+  status:
+    project:
+      default:
+        target: 70%
+        threshold: 2%
+    patch:
+      default:
+        target: 60%
+
+comment:
+  layout: "reach,diff,flags,files"
+  behavior: default
+  require_changes: true
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..dc4a6c4
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,2 @@
+# Global owner — auto-requested as reviewer on every PR
+* @ANSCoder
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 610048a..e712a96 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -52,8 +52,24 @@ jobs:
       - name: Build
         run: swift build -c release
 
-      - name: Test
-        run: swift test
+      - name: Test with coverage
+        run: swift test --enable-code-coverage
+
+      - name: Generate coverage report
+        run: |
+          xcrun llvm-cov export \
+            .build/debug/NexioPackageTests.xctest/Contents/MacOS/NexioPackageTests \
+            -instr-profile .build/debug/codecov/default.profdata \
+            -ignore-filename-regex ".build|Tests" \
+            -format lcov > coverage.lcov
+
+      - name: Upload to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          files: coverage.lcov
+          fail_ci_if_error: false
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
   # ── Swift 6 strict concurrency ────────────────────────────────────────────
   swift6:
diff --git a/.github/workflows/danger.yml b/.github/workflows/danger.yml
new file mode 100644
index 0000000..17e46b8
--- /dev/null
+++ b/.github/workflows/danger.yml
@@ -0,0 +1,29 @@
+name: Danger
+
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  danger:
+    name: Danger Swift
+    runs-on: macos-15
+    if: github.event_name == 'pull_request'
+    permissions:
+      pull-requests: write
+      issues: write
+      statuses: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Select Xcode 16.3
+        run: sudo xcode-select -s /Applications/Xcode_16.3.app
+
+      - name: Install Danger Swift
+        run: brew install danger/tap/danger-swift
+
+      - name: Run Danger
+        run: danger-swift ci
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/Dangerfile.swift b/Dangerfile.swift
new file mode 100644
index 0000000..2123a0a
--- /dev/null
+++ b/Dangerfile.swift
@@ -0,0 +1,38 @@
+// Copyright (c) 2026 ANSCoder
+// Licensed under the MIT License. See LICENSE in the project root for details.
+
+import Danger
+
+let danger = Danger()
+
+// Warn on large PRs
+let bigPRThreshold = 400
+let additions = danger.github.pullRequest.additions ?? 0
+let deletions = danger.github.pullRequest.deletions ?? 0
+if additions + deletions > bigPRThreshold {
+    warn("PR is large (\(additions + deletions) lines). Consider splitting.")
+}
+
+// Require CHANGELOG update for non-trivial PRs
+let hasChangelogUpdate = danger.git.modifiedFiles.contains("CHANGELOG.md")
+    || danger.git.createdFiles.contains("CHANGELOG.md")
+let isTrivial = danger.github.pullRequest.title.contains("[trivial]")
+    || danger.github.pullRequest.title.contains("docs:")
+    || danger.github.pullRequest.title.contains("chore:")
+if !hasChangelogUpdate && !isTrivial {
+    warn("No `CHANGELOG.md` update. Add an entry under `[Unreleased]` or prefix title with `chore:`/`docs:` to skip.")
+}
+
+// Require PR description
+let bodyLength = danger.github.pullRequest.body?.count ?? 0
+if bodyLength < 20 {
+    fail("PR description is too short. Explain what changed and why.")
+}
+
+// Warn if tests were not touched when source was modified
+let sourceChanged = danger.git.modifiedFiles.contains { $0.hasPrefix("Sources/") }
+let testsChanged = danger.git.modifiedFiles.contains { $0.hasPrefix("Tests/") }
+    || danger.git.createdFiles.contains { $0.hasPrefix("Tests/") }
+if sourceChanged && !testsChanged {
+    warn("Source files changed but no test files modified. Add or update tests where appropriate.")
+}
diff --git a/README.md b/README.md
index 0480d5d..68a3b93 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,10 @@
 [![Platforms](https://img.shields.io/badge/Platforms-iOS%2016%20·%20macOS%2013%20·%20watchOS%209%20·%20tvOS%2016-blue.svg)](https://developer.apple.com)
 [![SPM](https://img.shields.io/badge/Swift%20Package%20Manager-compatible-brightgreen.svg)](https://swift.org/package-manager)
 [![License](https://img.shields.io/badge/License-MIT-lightgrey.svg)](LICENSE)
+[![CI](https://github.com/ANSCoder/Nexio/actions/workflows/ci.yml/badge.svg)](https://github.com/ANSCoder/Nexio/actions/workflows/ci.yml)
+[![codecov](https://codecov.io/gh/ANSCoder/Nexio/branch/main/graph/badge.svg)](https://codecov.io/gh/ANSCoder/Nexio)
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2FANSCoder%2FNexio%2Fbadge%3Ftype%3Dswift-versions)](https://swiftpackageindex.com/ANSCoder/Nexio)
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2FANSCoder%2FNexio%2Fbadge%3Ftype%3Dplatforms)](https://swiftpackageindex.com/ANSCoder/Nexio)
 
 Typed JSON requests · Auth strategies · Retry with backoff · Interceptor pipeline · SwiftUI image loading · Zero dependencies