GitHub Actions Integration 🔦

The Lampe SDK includes a GitHub Action that makes it easy to integrate PR description generation and code review into your GitHub workflows. This action automatically fetches the necessary commit history and runs Lampe CLI commands in your GitHub workflows.

Features

Automatic Git History Fetching: Includes the fetch-through-merge-base functionality to ensure all PR commits are available
Multiple Commands: Support for describe, review, and healthcheck commands
Flexible Configuration: Extensive options for customization
Multiple Output Providers: Support for console, GitHub, GitLab, and Bitbucket outputs
Two Generation Variants: Default and agentic modes

Quick Start

Add this to your .github/workflows/pr-description.yml:

name: Generate PR Description
on:
  pull_request:

jobs:
  describe:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}
      - uses: montagne-dev/lampe@main
        with:
          command: describe
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}

Usage Patterns

Pull Request Open Event Only

To run the action only when a pull request is opened (not on every push), use the opened event trigger:

name: Generate PR Description
on:
  pull_request:
    types: [opened]

jobs:
  describe:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}
      - uses: montagne-dev/lampe@main
        with:
          command: describe
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}

Advanced Usage

name: Generate PR Description
on:
  pull_request:

jobs:
  describe:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}
      - uses: montagne-dev/lampe@main
        with:
          command: describe
          variant: agentic
          output: github
          files_exclude: "*.md,*.txt"
          files_reinclude: "docs/*.md"
          max_tokens: 12000
          timeout_seconds: 300
          verbose: true
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
          LAMPE_GITHUB_APP_ID: ${{ secrets.LAMPE_GITHUB_APP_ID }}
          LAMPE_GITHUB_APP_PRIVATE_KEY: ${{ secrets.LAMPE_GITHUB_APP_PRIVATE_KEY }}

Commands

`describe`

Generates a comprehensive PR description based on the changes in the pull request.

Features:

Analyzes file changes and commit history
Generates structured descriptions
Supports multiple output formats
Configurable file inclusion/exclusion

`review`

Performs code review analysis on the pull request.

Features:

Identifies potential issues and improvements
Provides actionable feedback
Supports different review styles and depths
Automatic model selection based on review depth
Integrates with GitHub's review system

Review Depth Options:

basic: Uses gpt-5-nano for faster, lighter reviews
standard: Uses gpt-5 for balanced reviews (default)
comprehensive: Uses gpt-5.1 for thorough, detailed reviews

Review Variants:

multi-agent: Uses specialized agents for different aspects (default)
diff-by-diff: Reviews each file change in parallel

`healthcheck`

Verifies that the Lampe SDK is properly configured and can connect to required services.

Features:

Validates API keys
Tests LLM connectivity
Checks configuration
Reports system status

Configuration Options

Input Parameters

Input	Description	Required	Default
`command`	The Lampe CLI command to run (`describe`, `review`, `healthcheck`)	Yes	`describe`
`repo`	Repository path	No	`.`
`title`	PR title (for local runs)	No	`Pull Request`
`base_ref`	Base ref for comparison	No	`${{ github.base_ref }}`
`head_ref`	Head ref for comparison	No	`${{ github.head_ref }}`
`output`	Output provider (`auto`, `console`, `github`, `gitlab`, `bitbucket`)	No	`auto`
`variant`	Generation variant (`default`, `agentic`) or review variant (`multi-agent`, `diff-by-diff`)	No	`default` (describe) or `multi-agent` (review)
`review_depth`	Review depth level (`basic`, `standard`, `comprehensive`). Model selection: basic=gpt-5-nano, standard=gpt-5, comprehensive=gpt-5.1	No	`standard`
`files_exclude`	Comma-separated list of file patterns to exclude	No	-
`files_reinclude`	Comma-separated list of file patterns to reinclude	No	-
`max_tokens`	Maximum tokens for truncation	No	`8000`
`timeout_seconds`	Timeout in seconds	No	-
`verbose`	Enable verbose output	No	`false`
`deepen_length`	Git fetch deepen length for merge-base	No	`10`

Environment Variables

The following environment variables can be set as GitHub secrets:

Variable	Description	Required
`OPENAI_API_KEY`	OpenAI API key for LLM calls	Yes (for LLM features)
`ANTHROPIC_API_KEY`	Anthropic API key for LLM calls	Yes (for LLM features)
`LAMPE_GITHUB_APP_ID`	GitHub App ID for GitHub integration	No
`LAMPE_GITHUB_APP_PRIVATE_KEY`	GitHub App private key	No

Output Providers

auto: Automatically detects the platform (GitHub, GitLab, Bitbucket)
console: Outputs to the GitHub Actions log
github: Integrates with GitHub's PR system
gitlab: Integrates with GitLab's merge request system
bitbucket: Integrates with Bitbucket's pull request system

Generation Variants

`default`

Standard generation using the default Lampe workflow.

`agentic`

Advanced generation using agentic workflows with enhanced reasoning capabilities.

File Filtering

Use files_exclude and files_reinclude to control which files are analyzed:

files_exclude: "*.md,*.txt,*.json"
files_reinclude: "docs/*.md,README.md"

Examples

Complete Workflow with Multiple Commands

name: Lampe Analysis
on:
  pull_request:

jobs:
  analyze:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}

      # Health check
      - name: Health Check
        uses: montagne-dev/lampe@main
        with:
          command: healthcheck
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}

      # Generate description
      - name: Generate Description
        uses: montagne-dev/lampe@main
        with:
          command: describe
          variant: agentic
          output: github
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}

      # Generate review
      - name: Generate Review
        uses: montagne-dev/lampe@main
        with:
          command: review
          variant: diff-by-diff
          review_depth: comprehensive
          output: github
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}

Custom Configuration

name: Custom Lampe Configuration
on:
  pull_request:

jobs:
  custom:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}
      - uses: montagne-dev/lampe@main
        with:
          command: describe
          variant: agentic
          output: console
          files_exclude: "*.md,*.txt,*.json,*.yml,*.yaml"
          files_reinclude: "docs/*.md,README.md"
          max_tokens: 15000
          timeout_seconds: 600
          verbose: true
          deepen_length: 20
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}

Review Command

Basic review (standard depth):

name: Review PR
on:
  pull_request:

jobs:
  review:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}
      - uses: montagne-dev/lampe@main
        with:
          command: review
          variant: multi-agent
          review_depth: standard
          output: github
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}

Comprehensive review with diff-by-diff variant:

name: Comprehensive Review
on:
  pull_request:

jobs:
  review:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}
      - uses: montagne-dev/lampe@main
        with:
          command: review
          variant: diff-by-diff
          review_depth: comprehensive
          output: github
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}

Quick review (basic depth):

name: Quick Review
on:
  pull_request:

jobs:
  review:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}
      - uses: montagne-dev/lampe@main
        with:
          command: review
          variant: diff-by-diff
          review_depth: basic
          output: github
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}

Health Check

name: Health Check
on:
  pull_request:

jobs:
  healthcheck:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}
      - uses: montagne-dev/lampe@main
        with:
          command: healthcheck
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}

Publishing the Action

To make this action available on GitHub Marketplace:

Create a Release: Tag a version (e.g., v1.0.0)
Update References: Change @main to @v1.0.0 in usage examples
Marketplace: The action will automatically appear in the marketplace

Local Testing

To test the action locally:

Use ./ instead of montagne-dev/lampe@main in workflows
Run the example workflows in .github/workflows/
Check logs for any issues

Migration from Current Workflow

To migrate from the current pr_description.yml:

Replace the manual steps with the new action
Move environment variables to the env section
Use the command: describe input
Test with a small PR first

Troubleshooting

Common Issues

API Key Issues: Ensure your API keys are properly set in GitHub secrets
Timeout Issues: Increase timeout_seconds for large repositories
Memory Issues: Reduce max_tokens for very large changes
Git History Issues: Increase deepen_length for repositories with deep history

Debug Mode

Enable verbose output to see detailed logs:

- uses: montagne-dev/lampe@main
  with:
    command: describe
    verbose: true

Health Check

Always run a health check first to verify your setup:

- uses: montagne-dev/lampe@main
  with:
    command: healthcheck

Security Considerations

All API keys are passed as environment variables
No sensitive data is logged
Git operations are performed safely with proper ref handling

Support

For issues and questions:

GitHub Issues: montagne-dev/lampe
Documentation: Lampe SDK Docs