diff --git a/.github/workflows/create_release.yml b/.github/workflows/create_release.yml
index 9fe54a78..f282ebda 100644
--- a/.github/workflows/create_release.yml
+++ b/.github/workflows/create_release.yml
@@ -3,14 +3,18 @@ on:
   push:
     tags:
       - '*'
+
+permissions:
+  contents: write
+
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
-    - name: Create a Release
-      uses: elgohr/Github-Release-Action@v5
-      env:
-        GITHUB_TOKEN: "${{ secrets.RELEASE_TOKEN }}"
-      with:
-        title: ${{ github.ref }}
+      - uses: actions/checkout@v6
+      - name: Create a Release
+        uses: elgohr/Github-Release-Action@v5
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+        with:
+          title: ${{ github.ref }}
diff --git a/.github/workflows/dart.yml b/.github/workflows/dart.yml
index 19d95359..fa4abf20 100644
--- a/.github/workflows/dart.yml
+++ b/.github/workflows/dart.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ master ]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ${{ matrix.os }}
@@ -22,12 +25,26 @@ jobs:
 
       - name: Install dependencies
         run: dart pub get
-      - name: Dart Analyzer
-        run: dart analyze
+
+      - name: Dart Analyzer (Strict mode)
+        run: dart analyze --fatal-infos
+
       - name: Check Dart Format
         if: ${{ matrix.sdk == 'stable' }}
         run: dart format --set-exit-if-changed -onone .
-      - name: Unit tests
+
+      - name: Verify Spec Sync Drift
+        if: ${{ matrix.sdk == 'stable' }}
+        run: dart run tool/spec_sync.dart --check --offline
+
+      - name: Unit and Contract Tests
         run: dart test
+
+      - name: Coverage Ratchet Check
+        if: ${{ matrix.sdk == 'stable' }}
+        run: |
+          dart test --coverage=coverage
+          dart run tool/coverage_check.dart coverage/lcov.info --min=30.0
+
       - name: Check if Publishable
         run: dart pub publish --dry-run
diff --git a/.github/workflows/publish_demos.yml b/.github/workflows/publish_demos.yml
index 7e13bac4..2605b329 100644
--- a/.github/workflows/publish_demos.yml
+++ b/.github/workflows/publish_demos.yml
@@ -3,6 +3,10 @@ on:
   push:
     branches:
       - master
+
+permissions:
+  contents: write
+
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/spec_sync.yml b/.github/workflows/spec_sync.yml
new file mode 100644
index 00000000..49cc8d70
--- /dev/null
+++ b/.github/workflows/spec_sync.yml
@@ -0,0 +1,98 @@
+name: Weekly GitHub OpenAPI Spec Sync
+
+on:
+  schedule:
+    # Run every Monday at 04:00 UTC
+    - cron: '0 4 * * 1'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  spec-sync:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Setup Dart SDK
+        uses: dart-lang/setup-dart@v1
+        with:
+          sdk: stable
+
+      - name: Install dependencies
+        run: dart pub get
+
+      - name: Check for upstream OpenAPI specification updates
+        id: check_upstream
+        run: |
+          mkdir -p .dart_tool
+          dart run tool/spec_sync.dart --offline --report-json > .dart_tool/spec_report_before.json
+          echo "Checked current spec baseline."
+
+      - name: Regenerate OpenAPI catalog and docs
+        id: run_sync
+        run: |
+          dart run tool/spec_sync.dart --update
+          git status --porcelain > .dart_tool/git_status.txt
+          if [ -s .dart_tool/git_status.txt ]; then
+            echo "changes_detected=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "changes_detected=false" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Validate generated code and contracts
+        if: steps.run_sync.outputs.changes_detected == 'true'
+        run: |
+          dart format --output=none --set-exit-if-changed .
+          dart analyze --fatal-infos
+          dart test
+          dart pub publish --dry-run
+
+      - name: Create or update spec-sync pull request
+        if: steps.run_sync.outputs.changes_detected == 'true'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          BRANCH_NAME="automation/github-openapi-spec-sync"
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+
+          git checkout -B "$BRANCH_NAME"
+          git add lib/src/common/generated/rest_contracts.g.dart docs/api-coverage.md tool/spec/
+          git commit -m "chore(spec): synchronize GitHub OpenAPI specification contracts"
+          git push --force origin "$BRANCH_NAME"
+
+          PR_TITLE="chore(spec): synchronize GitHub OpenAPI specification contracts"
+          PR_BODY="## GitHub OpenAPI Specification Sync
+
+          This automated pull request synchronizes the GitHub OpenAPI description contracts and coverage reports.
+
+          ### Summary of Changes
+          - Regenerated \`lib/src/common/generated/rest_contracts.g.dart\`
+          - Updated API coverage documentation in \`docs/api-coverage.md\`
+
+          ### Validation
+          - \`dart format\` verified
+          - \`dart analyze --fatal-infos\` passed
+          - \`dart test\` passed
+          - \`dart pub publish --dry-run\` verified
+
+          **Notice**: Review only. Never auto-merged."
+
+          gh pr create \
+            --title "$PR_TITLE" \
+            --body "$PR_BODY" \
+            --base master \
+            --head "$BRANCH_NAME" \
+            --label "automation,spec-sync" || \
+          gh pr edit "$BRANCH_NAME" \
+            --title "$PR_TITLE" \
+            --body "$PR_BODY"
diff --git a/.github/workflows/triage.yml b/.github/workflows/triage.yml
index 8b71d9ae..cd49b23a 100644
--- a/.github/workflows/triage.yml
+++ b/.github/workflows/triage.yml
@@ -3,6 +3,9 @@ on:
   issues:
     types: [opened]
 
+permissions:
+  issues: write
+
 jobs:
   assignRob:
     name: Assign Rob
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b574e5a8..b6ea9e48 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -38,6 +38,20 @@ To regenerate the JSON logic for the models, run:
 dart run build_runner build -d
 ```
 
+## OpenAPI Specification & Contract Sync
+
+This repository uses an OpenAPI-driven contract verification system pinned to the official GitHub REST API specification.
+
+- To check that code and documentation match the pinned OpenAPI specification:
+  ```sh
+  dart run tool/spec_sync.dart --check --offline
+  ```
+- To update or regenerate the REST contracts catalog and coverage report:
+  ```sh
+  dart run tool/spec_sync.dart --update
+  ```
+- Automated weekly pull requests (`spec_sync.yml`) monitor upstream API specification releases. Automated PRs are review-only and never auto-merged.
+
 ## Tests
 
 `dart test` will only run the unit tests.
diff --git a/README.md b/README.md
index 08dc8e09..12b8ef09 100644
--- a/README.md
+++ b/README.md
@@ -22,9 +22,35 @@ We are looking for contributors. If you're interested or have questions, head ov
 
 - [Library Demos](https://spinlocklabs.github.io/github.dart/) (based on the [sample code](https://github.com/SpinlockLabs/github.dart/tree/master/example))
 - [Pub Package](https://pub.dev/packages/github)
+- [API Coverage Report](docs/api-coverage.md)
 - [Wiki](https://github.com/SpinlockLabs/github.dart/wiki)
 - [Latest API reference](https://pub.dev/documentation/github/latest/)
 
+## OpenAPI Conformance and Spec Synchronization
+
+This library tracks the official [GitHub REST API v3 description](https://github.com/github/rest-api-description).
+- The OpenAPI specification baseline is pinned in `tool/spec/github-openapi.lock.json`.
+- Operation bindings and conformance are tracked in `tool/spec/bindings.yaml`.
+- Immutable REST contract metadata is generated into `lib/src/common/generated/rest_contracts.g.dart`.
+- Conformance and coverage metrics are documented in `docs/api-coverage.md`.
+
+To check or update the OpenAPI contracts locally:
+```bash
+# Verify no drift between specification and codebase
+dart run tool/spec_sync.dart --check --offline
+
+# Regenerate contracts and documentation
+dart run tool/spec_sync.dart --update
+```
+
+A weekly GitHub Actions workflow runs the spec sync check and opens review-only PRs when upstream API descriptions evolve.
+
+## Security and Best Practices
+
+- **Credential Boundaries**: Authenticated requests are constrained to the configured API origin (`api.github.com` or custom enterprise endpoint). Cross-origin redirects and pagination links automatically strip credentials. Insecure HTTP authentication is disallowed by default.
+- **Webhooks**: Always configure a webhook secret. Webhooks are validated using constant-time HMAC-SHA256 signature verification, enforce configurable payload limits, and support replay attack detection.
+- **Browser Authentication**: Token extraction from URL query parameters is disabled by default for security. Tokens should be passed via `Authentication.withToken()` or session storage.
+
 ## Examples
 
 See the examples in the example directory to learn how to use some of the features!