Configuration

Review prompt

Create a .lgtm or .lgtm.md file in your repo root to customize the review focus. For a global default, use ~/.config/lgtm/prompt.

---
ignore:
  - dist/**
  - "*.generated.ts"
skip:
  - "**/*.snap"
agents:
  - quality
  - architecture
---

Focus on security issues and potential data leaks.
Ignore formatting-only changes.
Flag any use of `eval()` or `dangerouslySetInnerHTML` as errors.

Frontmatter keys

Key	Description
`ignore`	Glob patterns for files to exclude from the diff entirely
`skip`	Glob patterns for files to include in the tree but skip from AI review
`agents`	List of agent IDs to enable (default: all built-in + custom)

The body text is the review focus prompt — it tells the AI what to pay attention to.

Global ignore

Place a plain list of glob patterns (one per line) in ~/.config/lgtm/ignore to ignore files across all repos:

package-lock.json
*.min.js
dist/**

CLI options

lgtm [options]

-b, --base <branch>     Base branch to diff against (default: auto-detected)
-p, --port <port>       Local server port (default: 3456)
--include-uncommitted    Include staged/unstaged changes
--no-open               Don't auto-open browser

The base branch is auto-detected from your remote — it checks for main, master, or the repo’s default branch.