diff --git a/.agents/skills/review-pull-request/SKILL.md b/.agents/skills/review-pull-request/SKILL.md
new file mode 100644
index 0000000..a09ca97
--- /dev/null
+++ b/.agents/skills/review-pull-request/SKILL.md
@@ -0,0 +1,251 @@
+# Skill: Review Pull Request for explain-error-plugin
+
+## Description
+
+Step-by-step workflow for reviewing pull requests submitted to the `jenkinsci/explain-error-plugin` repository. Produces a structured, actionable review covering security, code quality, architecture, UI, testing, and dependency management — consistent with Jenkins hosting requirements.
+
+## Tools
+
+- `github-pull-request_openPullRequest` — fetch PR metadata and diff
+- `github-pull-request_doSearch` — look up related issues or prior PRs
+- `file_search` / `grep_search` / `read_file` — inspect source files for context
+- `get_errors` — check for compile/lint errors
+- `run_in_terminal` — run `mvn test` or `mvn checkstyle:check` to validate changes
+
+---
+
+## Workflow
+
+### Step 1 — Fetch the PR
+
+Load the PR using the PR number or URL provided by the user.
+
+Collect:
+- Title, description, linked issue(s)
+- Changed files list
+- Diff/patch of each changed file
+
+> If no PR number is given, ask: *"Which PR number or URL would you like me to review?"*
+
+---
+
+### Step 2 — Understand the Intent
+
+Read the PR description and linked issue to understand **what problem is being solved**.
+
+Check:
+- Is there a linked issue? Does the change match the issue scope?
+- Is the change scoped (minimal, focused) or does it include unrelated refactoring?
+- Is there a test included?
+
+Flag if the description is absent or too vague to evaluate intent.
+
+---
+
+### Step 3 — Security Review
+
+For every changed `.java` file, check:
+
+#### API Keys / Secrets
+- [ ] API keys use `Secret apiKey` (not `String`)
+- [ ] Access uses `Secret.toString(apiKey)` only at usage point
+- [ ] No secrets logged or printed anywhere
+
+#### Permission Checks
+- [ ] All `doXxx()` form methods that change state or validate credentials use `@RequirePOST` (or `@POST`)
+- [ ] `Jenkins.get().checkPermission(Jenkins.ADMINISTER)` present in sensitive operations
+
+#### Nullability
+- [ ] Public API methods annotated with `@NonNull` or `@CheckForNull` (from `edu.umd.cs.findbugs.annotations`)
+- [ ] No unguarded `.get()` calls on `Optional` or nullable values
+
+#### Input Validation
+- [ ] User-supplied inputs validated at system boundary (form fields, pipeline step params)
+- [ ] No SQL/XSS/command injection surface (no shell exec with user data, no raw HTML output)
+
+---
+
+### Step 4 — Code Architecture Review
+
+#### Jenkins Extension Points
+- [ ] New config classes use `@Extension` + `@Symbol` for CasC support
+- [ ] `@DataBoundConstructor` present on constructors; optional fields use `@DataBoundSetter`
+- [ ] Global config provides a static `get()` method
+
+#### AI Provider Pattern
+- [ ] New providers extend `BaseAIProvider` and implement `ExtensionPoint`
+- [ ] Provider descriptor extends `BaseProviderDescriptor` with `@Symbol` annotation
+- [ ] `createAssistant()` used for LangChain4j integration (no direct HTTP/JSON)
+- [ ] `isNotValid()` implemented to guard against empty config
+
+#### Action Management
+- [ ] `addOrReplaceAction()` used (not `addAction()`) to avoid duplicate actions
+- [ ] New UI actions use `TransientActionFactory` instead of `RunListener`
+
+#### Backward Compatibility
+- [ ] If config fields are renamed or removed, a `readResolve()` migration method is present
+- [ ] Old fields marked `@Deprecated` and `transient` if replaced
+
+#### Logging
+- [ ] `java.util.logging.Logger` used (not SLF4J directly, not `System.out.println`)
+- [ ] Trace/debug calls use `FINE`/`FINER`/`FINEST`
+- [ ] `INFO` only for significant operational events
+- [ ] No `e.printStackTrace()` — exceptions logged via `LOGGER.log(Level.WARNING, "...", e)`
+
+#### Error Handling
+- [ ] Failures throw `ExplanationException` (not returned as strings)
+- [ ] Exception messages are user-friendly and actionable
+
+---
+
+### Step 5 — UI / Jelly Review
+
+For `.jelly` and `.js` files:
+
+#### Design System
+- [ ] Uses Jenkins design library components (`l:card`, `jenkins-button`, `jenkins-!-*` spacing classes)
+- [ ] No hard-coded colors — uses CSS variables (`var(--background)`, `var(--text-color)`)
+- [ ] Icons use symbol library (`symbol-help`, etc.) not image paths
+
+#### CSP Compliance
+- [ ] No inline `<script>` blocks in Jelly — JavaScript is in external `.js` files
+- [ ] No `onclick="..."` inline handlers
+
+#### JavaScript
+- [ ] Uses `fetch()` API (not `XMLHttpRequest`)
+- [ ] CSRF crumb included in POST requests via `crumb.wrap({...})`
+- [ ] Root context handled via `document.querySelector('head').getAttribute('data-rooturl')`
+
+---
+
+### Step 6 — Configuration as Code (CasC) Review
+
+- [ ] All new `GlobalConfiguration` subclasses have `@Symbol`
+- [ ] All new provider descriptors have `@Symbol`
+- [ ] If a new config field is added, verify it round-trips through a CasC YAML test
+
+---
+
+### Step 7 — Dependency Management Review
+
+For `pom.xml` changes:
+
+- [ ] No version specified for BOM-managed Jenkins plugin dependencies
+- [ ] Common libraries use API plugins (`jackson2-api`, `commons-lang3-api`) — not bundled JARs
+- [ ] `commons-lang` (old) never added — only `commons-lang3-api`
+- [ ] New third-party libraries (e.g., LangChain4j providers) exclude `slf4j-api` and `jackson-databind`:
+  ```xml
+  <exclusions>
+    <exclusion><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId></exclusion>
+    <exclusion><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId></exclusion>
+  </exclusions>
+  ```
+
+---
+
+### Step 8 — Testing Review
+
+- [ ] Tests use JUnit 5 (`@Test`, `@WithJenkins`)
+- [ ] **No mocking of LangChain4j internals** — `TestProvider` (extends `OpenAIProvider`) used instead
+- [ ] Both success path and failure path tested
+- [ ] New config fields have a CasC round-trip test
+- [ ] New pipeline step parameters have an `ExplainErrorStepTest` entry
+- [ ] Migration logic (if any) has a `ConfigMigrationTest` entry
+
+---
+
+### Step 9 — Build Verification
+
+Run these checks locally (or confirm CI passes):
+
+```bash
+mvn compile          # No compile errors
+mvn test             # All tests pass
+mvn checkstyle:check # No style violations (if configured)
+```
+
+Flag any failures as blocking. Flag test-only failures as high priority.
+
+---
+
+### Step 10 — Compose the Review
+
+Structure the output as:
+
+```
+## PR Review: #<number> — <title>
+
+### Summary
+<1–2 sentence summary of what the PR does and whether the intent is clear>
+
+### Overall Verdict
+✅ Approve | ⚠️ Request Changes | ❌ Block
+
+### Blocking Issues
+<List issues that MUST be fixed before merge, e.g. security, missing tests>
+
+### Non-Blocking Suggestions
+<Optional improvements: naming, Javadoc, minor style>
+
+### Checklist Results
+| Area              | Status |
+|-------------------|--------|
+| Security          | ✅ / ⚠️ / ❌ |
+| Architecture      | ✅ / ⚠️ / ❌ |
+| UI / Jelly        | ✅ / ⚠️ / ❌ |
+| CasC Support      | ✅ / ⚠️ / ❌ |
+| Dependencies      | ✅ / ⚠️ / ❌ |
+| Tests             | ✅ / ⚠️ / ❌ |
+| Build             | ✅ / ⚠️ / ❌ |
+```
+
+---
+
+## Decision Tree
+
+```
+PR opened
+│
+├─ Description missing or vague?
+│   └─ Request description before reviewing
+│
+├─ New AI provider added?
+│   ├─ Extends BaseAIProvider? → Check createAssistant(), isNotValid(), @Symbol
+│   ├─ Has Jelly config.jelly? → Check design library usage
+│   ├─ Has pom.xml dependency? → Check exclusions
+│   └─ Has TestProvider-based tests? → Check success + failure cases
+│
+├─ Config field added or renamed?
+│   ├─ readResolve() migration present? → Must be for renamed/removed fields
+│   └─ CasC round-trip test present? → Required
+│
+├─ Pipeline step parameter added?
+│   ├─ @DataBoundSetter used? → Required for optional params
+│   └─ ExplainErrorStepTest covers it? → Required
+│
+└─ UI change (Jelly / JS)?
+    ├─ Inline script? → Block: must be extracted
+    ├─ Hard-coded colors? → Block: use CSS vars
+    └─ fetch() used? → Crumb required for POST
+```
+
+---
+
+## Quality Completion Criteria
+
+A PR is ready to merge when:
+1. All **Blocking Issues** are resolved
+2. CI (compile + tests) is green
+3. No secrets stored as `String`
+4. No `@Symbol` missing on new extension points
+5. At least one test covers the new/changed behavior
+6. UI follows Jenkins design library (if applicable)
+
+---
+
+## Example Prompts
+
+- *"Review PR #42 in jenkinsci/explain-error-plugin"*
+- *"Do a security-focused review of PR #15"*
+- *"Check if PR #7 follows the testing requirements for this plugin"*
+- *"Review the dependency changes in PR #33"*
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 1544071..02d8160 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -7,7 +7,10 @@
       "version": "17",
       "installMaven": "true"
     },
-    "ghcr.io/devcontainers/features/github-cli:1": {}
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/devcontainers/features/node:1": {
+      "version": "lts"
+    }
   },
 
   "customizations": {
@@ -18,7 +21,7 @@
     }
   },
 
-  "postCreateCommand": "mvn clean verify -DskipTests",
+  "postCreateCommand": "bash -c 'curl -fsSL https://gh.io/copilot-install | bash && curl -fsSL https://claude.ai/install.sh | bash && mvn clean verify -DskipTests'",
 
   "forwardPorts": [8080],
 
diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 5b382ea..1b11cc2 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -132,10 +132,8 @@ Use `provider.setThrowError(true)` to simulate failures, `provider.getLastCustom
 - Key dependencies: `jackson2-api`, `workflow-step-api`, `commons-lang3-api`
 
 ### Commands
-- `mvn compile` - Compile the plugin
-- `mvn test` - Run unit tests
-- `mvn hpi:run` - Start Jenkins with plugin for testing
-- `mvn package` - Build .hpi file
+
+A `Makefile` is provided for convenience — run `make help` to list all targets.
 
 ## Configuration & Usage
 
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 79bf1ac..841ff12 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -24,27 +24,10 @@ This guide will help you get started with development and contribution.
 
 2. **Build the plugin:**
 
-   ```bash
-   # Clean and compile
-   mvn clean compile
-   
-   # Package the plugin
-   mvn clean package
-
-   # Package without running tests (useful for development)
-   mvn clean package -DskipTests
-   ```
+   A `Makefile` is provided for convenience. Run the following to see all available targets and their descriptions:
 
-3. **Run Jenkins locally with the plugin:**
    ```bash
-   # Start Jenkins on http://localhost:8080
-   mvn hpi:run
-   
-   # Or on a custom port
-   mvn hpi:run -Dport=5000
-
-   # check for code quality issues
-   mvn spotbugs:check
+   make help
    ```
 
 ### 2. Plugin Installation & Testing
@@ -53,7 +36,7 @@ This guide will help you get started with development and contribution.
 
 1. **Build the plugin:**
    ```bash
-   mvn clean package -DskipTests
+   make package
    ```
 
 2. **Install in Jenkins:**
@@ -68,6 +51,8 @@ This guide will help you get started with development and contribution.
    # Restart Jenkins
    ```
 
+> **Tip:** Run `make help` anytime to see all available build, test, and run targets.
+
 #### Plugin Configuration for Development
 
 1. **Navigate to Jenkins configuration:**
@@ -88,16 +73,7 @@ This guide will help you get started with development and contribution.
 
 ### Running Tests
 
-```bash
-# Run unit tests
-mvn test
-
-# Run integration tests
-mvn verify
-
-# Skip tests during development (not recommended for PRs)
-mvn clean package -DskipTests
-```
+Run `make help` to see all available test-related targets.
 
 ### Writing Tests
 
@@ -156,6 +132,8 @@ class AIServiceTest {
 - **Line length**: Maximum 120 characters
 - **Naming**: Use descriptive names for classes and methods
 
+To check for code quality issues, run `make help` to find the lint target and execute it.
+
 ### Architecture
 
 The plugin follows these patterns:
@@ -199,9 +177,13 @@ src/main/java/io/jenkins/plugins/explain_error/
 
 1. **Before submitting:**
    - ✅ All tests pass
+   - ✅ Full verify passes
+   - ✅ No new lint issues
    - ✅ Code follows style guidelines
    - ✅ Documentation updated
 
+   Run `make help` to see the relevant targets for each of the above steps.
+
 2. **PR checklist:**
    - [ ] Descriptive title and description
    - [ ] Related issue linked (if applicable)
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..59e8fa1
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,37 @@
+.PHONY: help build test verify clean package package-full run debug lint reinstall
+
+# Default target
+.DEFAULT_GOAL := help
+
+help: ## Show this help message
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-15s\033[0m %s\n", $$1, $$2}'
+
+build: ## Compile the plugin (skip tests)
+	mvn compile
+
+test: ## Run all unit tests
+	mvn test
+
+verify: ## Compile, test, and verify (full CI check)
+	mvn verify
+
+clean: ## Remove build artifacts
+	mvn clean
+
+package: ## Build the .hpi plugin file (skip tests)
+	mvn package -DskipTests
+
+package-full: ## Build the .hpi plugin file (with tests)
+	mvn package
+
+run: ## Start Jenkins locally with the plugin (http://localhost:8080/jenkins)
+	VSCODE_JDWP_ADAPTER_ENDPOINTS="" mvn hpi:run
+
+debug: ## Start Jenkins with remote debugger on port 8000 (attach anytime, does not block)
+	VSCODE_JDWP_ADAPTER_ENDPOINTS="" mvn hpi:run -Ddebug="-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=localhost:8000"
+
+lint: ## Run Checkstyle and SpotBugs static analysis (report only, non-blocking)
+	mvn checkstyle:checkstyle spotbugs:spotbugs
+
+reinstall: ## Clean, rebuild, and install .hpi locally
+	mvn clean install -DskipTests