cartomancer

PR review tool with blast radius awareness — opengrep + cartog + LLM deepening.

Cartomancer bridges static analysis with code graph intelligence to produce structurally-aware, severity-escalated review comments on GitHub pull requests.

Install

cargo install cartomancer

Requires opengrep in PATH.

Usage

# Scan a local directory
cartomancer scan .

# Review a GitHub PR (requires GITHUB_TOKEN)
export GITHUB_TOKEN=ghp_...
cartomancer review owner/repo 42

# Dry run — output review JSON without posting
cartomancer review owner/repo 42 --dry-run

# Reuse an existing checkout
cartomancer review owner/repo 42 --work-dir /path/to/repo

How it works

1. Fetch PR diff from GitHub
2. Run opengrep with --baseline-commit (only new findings)
3. Enrich with cartog blast radius and caller analysis
4. Escalate severity for findings in auth/payment flows or with large blast radius
5. Optionally deepen high-severity findings with LLM (Ollama or Anthropic)
6. Post PR review with inline comments + summary

Configuration

Create .cartomancer.toml in your project root:

[opengrep]
rules = ["auto"]
timeout_seconds = 120
# taint_intrafile = false       # cross-function taint analysis
# enclosing_context = false     # surrounding function in findings (improves LLM deepening)
# ignore_pattern = "nosec"      # custom inline ignore annotation
# dynamic_timeout = false       # file-size-scaled timeouts

[llm]
provider = "ollama"
ollama_model = "gemma4"

[severity]
blast_radius_threshold = 5
llm_deepening_threshold = "error"

License

MIT